A repulsive magnetic levitation (maglev) device is proposed in which two ring-shaped stator permanent magnets and one ring-shaped floating permanent magnet repel each other, and a magnetic field from four air-core coils actively controls two horizontal axes of the floating permanent magnet. This device is applicable to measuring minute mass and vibration. The ring-shaped permanent magnet was stably levitated without contact for a while. However, as time passed, the floating permanent magnet oscillated around the central axis and then started to rotate, and finally became out of control. This paper presents that the floating ring permanent magnet with four salient poles overcomes that issues. Besides, this paper also reports the mass detection experiments by three measuring ranges of stiffness values.

　In recent years, the world's energy consumption has been increasing year by year due to the world's population growth, industrialization, and economic development in emerging countries. However, while much of the world's energy supply depends on fossil energy, fossil fuels are said to be depleted in decades. Therefore, research on vibration energy harvesters is being conducted as one of the measures. Vibration energy harvesters can generate a large amount of power by resonating with a vibration source. Therefore, this study focuses on the passive self-tuning phenomenon. The purpose of this research is to examine whether passive self-tuning phenomenon is useful for broadening the resonance band of vibration energy harvesters.

　The capsule endoscope has the advantage that cameras mounted inside the capsule can examine the digestive tract from the mouth to the anus only by swallowing, and the burden on the patient is small. However, the exact position of the capsule endoscope in the body is unclear. Therefore, authors have produced a real-time position detector that detects the position of the capsule endoscope in the body based on the pitch of the speaker sound.

The manufactured position detector had low accuracy of position detection, so authors improved the directivity of the antenna by attaching a shield to the antenna of the position detector. As a result of experiments using human simu-lated substances, the position detector with shield has a 83% reduction in position detection error range compared to the position detector without shield.

　In this study, the relationship between the amount of material removed and the current characteristics on polishing or processing using a magnetic compound fluid (MCF) while simultaneously applying electric and magnetic fields was in-vestigated. Changes in the amount of material removed and the electric current in each experimental condition for flat surface polishing and cylindrical inner surface processing were clarified. It was confirmed that the amount of material removed was increased by the application of an electric field, and that the processed surface was flattened and smoothed when processing the inner surface of the cylinder. The electrical characteristics in each polishing or processing method were considered from the electric current characteristics.

　This paper proposes a dynamic simulation method of a magnetic gear using its torque map. The phase angle difference between the input and output rotors depends on a load of the output rotor. The load contains an external load and brake torque due to internal mechanical and iron losses. In this situation, the dynamic performance of a magnetic gear is computed by a transient analysis using a motion equation, and the computation cost is large. In order to reduce the com-putation cost of a magnetic gear, a dynamic simulation method using its torque map is proposed and discussed.

　Vernier motors have been proposed for low speed and high torque applications. The rotor of the vernier motor rotates slower speed than the rotating magnetic field according to a reduction ratio determined by the relationship between the number of poles of the armature winding and the number of rotor teeth. In this research, we propose a novel motor in which the rotational speed of the rotor is faster than the rotational speed of the rotating magnetic field. General high-speed motors are designed to have two poles due to frequency limitations. On the other hand, the proposed motor rotates at the same rotation speed with multipolar windings. Therefore, the proposed motor can be achieved more compactness than conventional high-speed motors. In this paper, we shown the structure and principle of the proposed motor. Furthermore, the feasibility of the proposed motor was shown by FEM analysis and test of prototype.

　The evaluation of magnetic field effects on living organisms is important but rarely reported. In this study, we conducted a magnetic field exposure survey of an implantable momentum meter to evaluate the biological effects of small experimental animals on magnetic field exposure. As a result, when the activity meter was irradiated with a magnetic field of 122 dBµA/m, no adverse effect of the magnetic field exposure was observed in both the stationary and active state.

　This study investigates the effectiveness of the electromagnetic shunt damper for reducing the amplitude of nonlinear resonance of a superconducting magnetic levitation system by numerical calculation. An electromagnetic shunt damper, a type of dynamic vibration absorber, can suppress mechanical vibration of the main system by converting a part of its vibration energy into electric energy of a subsystem consisting of an electric circuit. Since the electromagnetic force caused by superconductors has nonlinearity, complicated nonlinear resonance can occur in the superconducting magnetic levitation system in addition to its main resonance. This study especially focuses on 1/2-order subharmonic resonance, which can generate a larger vibration component at half the excitation frequency. Numerical calculations were carried out to examine how two types of electromagnetic shunt dampers consisting of LCR series and parallel circuits can effectively suppress this nonlinear resonance. As a result, it was confirmed that the parallel type electromagnetic shunt damper is more effective in reducing the amplitude of the subharmonic resonance than the series type, even under the condition of a larger excitation amplitude.

　Photovoltaic power generation systems have an electromagnetic interference problem caused by switching of power conditioning systems. As an example of this electromagnetic interference, interference to the AM radio band has been reported. It has also been reported that a bus bar, which is one of the internal wirings of a solar cell, is formed as an antenna. In this paper, the influence of the number of bending steps of the bus bar on the magnetic field was analyzed by the finite element method. As a result, it was found that when the bus bar has even-numbered stages, the magnetic flux density at the center is smaller than that of the odd-numbered stages.

　In recent years, various types of energy are consumed every day around the world, and among them, the proportion of fossil fuels is high. For this reason, renewable energy that does not have to be depleted has attracted attention, and various R & D activities have been conducted. Among renewable energies, research on solar cells is being actively conducted, and silicon solar cells (hereinafter PV modules) are the most widely used. However, it has been reported that the noise radiated from the PV module interferes with the AM radio band (526.5 - 1606.5 kHz). In addition, the radiated noise tends to increase as the PV module area increases. Therefore, our laboratory is studying a method to reduce the noise radiated from the PV module surface. In previous study, it was found that a noise suppression method using electromagnetic induction by installing a suppression wire on the back of a PV module was effective. However, in a high-frequency environment, a skin effect occurs, and the resistance value increases, which may hinder noise suppression. Therefore, in this study, the litz wire was examined as a new suppression wire to improve the suppression rate.

　This research is a proposal of a novel transfer device using a Transverse Flux-Flux Reversal Linear Motor (TF-FRLM). Transfer device in this paper is mounted on a carrier apparatus which was operated in parallel synchronous operation. This digest mainly discusses the overview of a transfer device and the optimization result of C-core TF-FRLM. The section of transfer device describes the basic structure and basic operation. In the optimization section, the results for single-sided and double-sided structures are displayed in a graph and the comparison is explained. Three-dimensional finite element analysis is used for dimension optimization.

　A Z-θ actuator is expected to achieve a two-degree-of-freedom positioning mechanism which has a high positioning accuracy, small, and lightweight. However, the improvement of a torque and thrust density is important for further higher performance, thus, we focused on a transverse-flux structure. This paper proposes a novel Z-θ actuator with double gaps. The actuator is combined with a transverse-flux type linear actuator and a permanent magnet synchronous motor. The thrust and torque characteristics are investigated by a magnetic field analysis using a three-dimensional finite element method. It is clarified that the actuator can generate torque and thrust by the proposed operating method and magnetic circuit, the mover structure for improving the output is considered.

　The fluctuation of the magnetic resistance on the concentrated winding motor is large at high speed rotation. Spatial harmonics are easily generated, which leads to an increase in torque ripple and iron loss. Therefore, we propose a motor structure that reduces spatial harmonics by providing a ring formed of a magnetic composite material on the stator. The ring of magnetic composite can reduce magnet iron loss and torque ripple by more than 50% and 2%, respectively, com-pared to conventional motors.

　This paper presents a distinction recognition between robots by Electroencephalogram / Event-Related Potential N170 analysis. N170 is a waveform induced around 170 milliseconds after the presentation of a stimulus when a human face is presented as a stimulus. An experiment was performed on the assumption that the amplitude and time of the N170 wave change depending on the recognition of the human and the robot's face because the robot is recognized as an object rather than a human. As a result, it was confirmed that the amplitude and latency of N170 were changed by the robot. In the near future, we aim to increase the types of robots and clarify the degree of detailed recognition between humans and robots.

　This research presents development of an Autonomous Mobile Robot with Leveled Platform. Autonomous Mobile system based on information fusion obtained from camera and laser scanner. leveling of the platform was controlled by servo motor based on the posture data from 6 axis sensor filtered by Madgwick filter. Finally, the robot could move autonomously in complicated environments and could keep the platform leveled.

　Inspired by the motions of the snakeboard, this paper considers the application of the propulsion mechanism with the sole actuator to the transportation. This mechanism obtains the propulsion force from the rotor rotation. However, this rotor does not necessarily rotate if the counter force is obtained from the rotor. Based on this idea, we tackle the transportation where the one-actuator robot conveys a dolly by connecting the bottom of dolly to the rotor of the robot. Then, we propose a connecting method that can absorb the difference of the height between the robot and dolly. To verify the transportation with the commercial dolly, the one-actuator robot is manufactured. Using this robot, we demonstrate the actual transportations by some experiments.

　Neonates with chronic lung disease (CLD) have long-term respiratory management, and high frequency oscillatory ventilation (HFOV) has been sought to prevent CLD. A voice coil motor is used in clinical HFOV ventilators, and this study aims to develop a HFOV motor using a linear oscillatory actuator (LOA). The LOA is an actuator with features such as a simple system and improved reliability, because the structure is very simple and the reciprocating motion of the piston part, which is the basic operation of the HFOV ventilator, can be obtained without a conversion mechanism. Focusing on LOA with a simple structure as an HFOV actuator, we have developed an actuator for an HFOV ventilator that is compact and has a high thrust.

　Rotational vibration causes an increase in vibration and noise and is a problem in various transportation equipment including automobiles. This paper proposes a new method of rotational vibration suppression using a linear oscillatory actuator driven in the radial direction. Numerical calculations show that the Coriolis force increases as the mover oscillates in the radial direction due to the electromagnetic force generated by the LOA.

　We are studying undersea wireless transfer. We have clarified the power transmission characteristics between the coils when the power supply coil / power receiving coil are waterproofed with a glass case. In the deep sea, it is necessary to use spherical pressure-resistant glass for the waterproof case in order to withstand high water pressure. However, when a wireless power transmission system is installed inside a sphere, the shape, size, and placement location of the coil are restricted. Therefore, we solve the problem with a coil shaped according to the case. This coil is called a cone spiral coil. In this paper, we analyze the wireless power transmission using a cone spiral coil by the finite element method and report the superiority of the cone spiral coil compared to the case where the helical coil is used.

　Recently, six-degree-of-freedom mechanisms are demanded in various applications such as positioning systems for semiconductor exposure equipment and camera stabilizer for a drone. The conventional systems are required some actuators and links to drive six-axis. Therefore, the size and weight increase. In order to solve these problems, we proposed the short-stroke six-degree-of-freedom actuator. The proposed magnetic structure and operating principle were verified by a magnetic field analysis using a three-dimensional finite element method. This paper describes the static thrust and torque characteristics that are experimentally clarified by using a prototype. The experimental results show that the proposed actuator can drive to six-axis and that the analysis results are valid by the comparison of the analysis results.

　Two pole IPM type high speed motor has been developed. Hybrid (HB) magnetic bearing is tested by regenerated energy from high speed motor after sudden power stop. The motor should have wide air gap for levitation and the rotor speed is better to be decreased before touch down. The regenerative brake is useful to reduce the rotor speed and to operate the magnetic bearing by the regenerated energy. The motor is designed with a commercial FEM code MagNet. Due to our budget limitation, previously developed magnetic bearing is used to support one end of the rotor shaft and another end is supported by a ball bearing. The motor system is fabricated and the sudden power stop is tested.

　In this paper, is proposed a battery-less wireless sensor to generate power at door operation and to transmit temperature and humidity information. The power generation device is a U-shaped 1 mm thick iron frame with 8 × 1 × 32 mm³ Fe-Ga alloy laminated and coil wound, and a mechanism to generate free vibration by the movement of door using the desorption of permanent magnet attached to the frame tip. By attaching a capacitor which cancels the inductive reactance of the coil to the voltage doubler rectifier circuit, the storage energy over 3 mJ sufficient for the operation of wireless module (920M Hz) was generated in the capacitor of 220 μF, and it succeeded in transmitting temperature and humidity data in 1 time operation. In addition, the system was mounted on the door of clean rooms, and it succeeded in carrying out the transmission and reception without the lack of the data, when the monitoring test for 2 weeks was carried out.

　Early detection is effective for breast cancer. However, in the present breast cancer examination, the examination accuracy depends on the skill of the medical technologist. Therefore, in this study, we will develop an auxiliary device for breast examination in order to obtain ultrasound images with clear tumor size and location. This paper describes a position control system with force control. Control of position and force prevents unnecessary loading during scanning. The operation verification result of the constructed control system is also described.

　This paper investigates a vernier motor which has permanent magnets in its stator. The stator of this vernier motor consists of an inner and outer cores. The air gap between cores increases the magnetic resistance. On the other hand, the inner bridge of inner stator increases the magnetic flux density of the permanent magnet. The operational principle of the vernier motor is described, and the performance of the vernier motor is discussed using 2-D FEM.

　Linear actuators mounted on collaborative robots that work in the same space as humans are required to have high thrust density and back drivable characteristics. Therefore, a series elastic actuator with elasticity using a mechanical spring has been proposed, but the problem is that the structure is complicated and the size is increased. Therefore, we proposed a magnetic screw motor that integrates a magnetic screw and a motor, but there was a problem that the thrust was small. This paper describes the influence of a step skew structure in the stator yoke on the motor characteristics. A magnetic screw motor with a spiral stator is proposed. However, it is difficult to achieve the spiral stator in terms on the cost and manufacturing. In order to solve the problem, a step skew structure is proposed, and its torque characteristics are investigated using 3-D finite element analysis.

　A transcutaneous energy transmission system (TETS) is one of the methods for supplying power to a ventricular assist device (VAD). The driving power of VAD changes during exercise or rest by changing the load resistance with a rated voltage of 24 V. Therefore, it is necessary to introduce a DC–DC converter to TETS and to design TETS with less output voltage fluctuation when changing the load resistance. In this study, two types of compensation topologies—SS and double-sided LCC topologies—are introduced to TETS, and their output voltage fluctuations are compared. Consequently, the double-sided LCC topology can reduce the output voltage fluctuation by 13% more compared to the SS topology. Furthermore, when a DC–DC converter is introduced to TETS with the double-sided LCC topology, the rated voltage of the VAD can be kept constant, and the transmission efficiency reaches more than 50%.

　A transcutaneous energy transmission system (TETS) that supplies power to ventricular assist devices has been studied. TETS causes conducted emissions (CE) and radiated emissions because it transmits large electromagnetic energy(approximately 15 W). In this study, the CE from TETS was measured and the reduction method of CE was investigated. First, the optimum phase shift time between the drain-source voltage and the drain current of the MOSFET in the inverter circuit of TETS was determined by adjusting the resonance capacitor C₁. Second, the parasitic capacitance between the primary and secondary coils of the high-frequency isolation transformer was reduced by changing the winding pattern. As a result, the CE was reduced by 80 dBµV at 5 MHz by insertion of C₁ of 7.74 nF. Additionally, by using an isolation transformer with concentrated winding, the CE was reduced by 9 dBµV at 15 MHz, as compared to the isolation transformer with uniform winding.

　Vital data communication is useful in preventing heatstroke during firefighting activities by firefighters. Since the communication environment may deteriorate at the fire site, it is desirable to use a wireless repeater if required. The antenna mounted on the wireless repeater is required to be able to transmit and receive regardless of the situation on the back conditions. In this paper, we proposed an artificial magnetic conductor (AMC) integrated antenna with a planar structure that can reduce the influence of the backside by using AMC and examined its characteristics by electromagnetic field analysis. As a result, the antenna combined with AMC was able to increase the gain and front-to-back ratio without significantly reducing the reflection coefficient to the antenna alone. In addition, deterioration of reflection coefficient and movement of resonance frequency could be reduced even on a metal plane.

　In the fields of neurophysiology and behavioral psychology, the activity of small laboratory animals has been measured as part of animal experiments. Implantable activity meters are useful for this purpose, however they use batteries, making it difficult to record for long periods of time, and their weight and dimensions cause stress on the animals. A wireless power transmission system is useful for this purpose. To realize this system, it is essential to supply power from the power transmission coil to the locomotion meter embedded in the small animal. In this process, exposure of the body to magnetic fields is inevitable. In this study, we evaluated the behavior of experimental small animals exposed to magnetic fields at frequencies and magnetic field strengths that have been investigated for wireless power transmission as a power supply method to implantable locomotion meters. As a result, there was no effect on the living body.

　There is an extremely high demand for smaller size, lighter weight, and higher efficiency of magnetic parts used in transportation equipment such as railway, automobile, and aircraft. Weight reduction is possible by using aluminum winding instead of copper winding for the winding. However, the loss of the aluminum winding is larger than the loss of the copper winding, because the resistivity of aluminum is higher than that of copper. Therefore, the authors propose the magnetic tape wrapped rectangular aluminum winding (hereinafter called MAW) that achieves both weight reduction and low loss. Analysis confirmed that applying MAW to high-frequency transformer for railway reduced copper loss by 11.5% compared to rectangular copper winding and 30.2% compared to rectangular aluminum winding. In addition, it is 40.3% lighter than a high-frequency transformer for railway that using rectangular copper winding.

　Contact-type disc brakes used in aircraft axle brakes have the disadvantage that the discs and brake pads wear out each time the brake is applied. The authors have therefore been researching and developing a new non-contact type eddy current aircraft brake. This study investigated the characteristics of the eddy current brake when a composite material disc is used to improve the brake torque in a three-phase AC excitation. As a result, the value of the brake torque of the composite material disc was obtained 53% higher than that of a Cu disc.

　Space recognition is a crucial task for autonomous systems such as robots and unmanned aerial vehicles. These systems necessary to get information using a camera while moving. However, the decrease of the recognition accuracy attributed to an image quality deterioration due to vibration and the increase of the system size have become problems. To solve these problems, we focused on multiple-degree-of-freedom (DOF) actuators. However, conventional multiple-DOF actuators require a large number of components, and the control device is large in size. Thus, we propose a novel multiple-DOF actuator that can be driven by a simple control device with a small number of components. First, a 2DOF actuator driven by a 3-phase half-bridge circuit is described. Next, a 3DOF actuator driven by a 4-phase half-bridge circuit is presented. The basic performance is evaluated by a magnetic field analysis using a three-dimensional finite element method. The analysis results show that the proposed actuator can be driven by the proposed operating principle and magnetic structure.

　In order to construct a multiple-degrees-of-freedom system by using the motors with one degree of freedom, the same number of motors as the degree of freedom is required. On the other hand, a spherical motor has three degrees of freedom. It is possible to realize a system with three degrees of freedom by one spherical motor and, therefore, it can reduce the size of the system. In order to transmit the output torque by a spherical motor, a spherical speed reducer that can also change the rotation speed and output torque is required. This study develops a new mechanism for spherical speed reducer using intermediate small balls that their rotations are restricted in two rotation axes. This paper describes the mechanism of the proposed spherical speed reducer, theoretical rotation transmission model between the rotor of a spherical motor and the output sphere of the spherical speed reducer. The theoretical transmission model is confirmed by the results of the spherical speed reduction experiments using a prototype spherical speed reducer.

　Haptic devices using an asymmetric vibration for inducing a virtual force are developed to apply to various applications such as navigation systems. The miniaturization of the structure is required for a mobile type three-dimensional haptic device. Then, we focused on a three-degree-of-freedom linear oscillatory actuator (3DOF-LOA) for the driving source of the haptic device. However, conventional 3DOF-LOAs are large in size and weight because they need a large and complicated support mechanism on the outside of the magnetic circuit. To solve these problems, we propose a novel 3DOF-LOA integrated with a support mechanism. This paper describes the proposed structure and operating principle and clarifies the force, frequency characteristics, and acceleration responses. As a result, it is confirmed that the proposed 3DOF-LOA can drive with asymmetric acceleration for the haptic presentation.

　Multi-degree-of-freedom (multi-DOF) spherical actuators have been developed for the fields of robotics and industrial machinery. We have proposed an outer rotor type three-DOF spherical actuator that can realize a high torque density. Its input current of each coil is calculated using the torque generation equation based on the torque constant matrix. Although a control method to calculate the current value has already been proposed, the analysis accuracy of the torque model is not sufficiently examined for a precision robot that requires the positioning accuracy of about 0.1 mm. In this paper, for the purpose of applying our three-DOF spherical actuator to such a precision robot, we investigated the factors that affect the analysis accuracy of a dynamic analysis method and improved the analysis accuracy.

　Magnetic Compound Fluid (MCF) rubber is a new smart sensor obtained by mixing rubber with MCF. It has practicality of being a wide variety of new elements such as haptic sensor, piezoelectric element, solar cell, and energy harvesting. In this study, we investigated the energy harvesting technologies utilizing MCF rubber for sunlight and radiation. Additionally, we developed a tactile sensor for a humanoid robot which used to investigation of nuclear building as an application of piezoelectric elements utilizing MCF rubber.

　Sensors that detect vehicles are widely used around us. Among them, the electromagnetic induction type sensor has extremely excellent performance among the sensors that detect the vehicle by the non-contact method. However, there was no paper that organized how to use the output voltage characteristics of the electromagnetic induction sensor. Therefore, the authors focused on an electromagnetic induction sensor suitable for vehicle detection, and proposed an electromagnetic induction sensor using three coils. Using the output voltage characteristics of this sensor, we investigated the improvement of vehicle type discrimination accuracy and traveling direction detection accuracy. By analysis and actual measurement, it can be expected to detect the traveling direction of the vehicle and the dimensional difference of the vehicle from the output voltage characteristics of the sensor at a lift-off of 400 mm.

　This paper proposes a rotor posturę measurement method applying pattern matching of magnetic field for a spherical motor driven by electro-magnetic forces. The proposed method estimates the relative position of a permanent magnet arranged on the rotor by pattern matching of the outputs of arrayed Hall sensors with their output patterns measured and stored beforehand. This study develops a program to measure the rotor poture by the proposed method. The applicability of the proposed method is confirmed from the results of rotor posture measurement experiments for the rotation around x, y, and z axes. The measurement performance is compared with the method studied in a previous study. The measurement accuracy increases for the rotation around z axis. However, there are still some problems to improve the measurement performance.

　The conventional motor is driven with one degree of freedom, whereas the spherical motor is driven with three degrees of freedom. As a result, compared to conventional motors, control to the target posture is easier in a mechanism using spherical motors. In addition, the difficulty of achieving ultra-high accuracy due to assembly errors and difficulty of maintenance will be reduced. Because of these features, spherical motors are expected to be used for robot eyes, joints, reaction wheels, and stirrers. In the culture of cells in biotechnology, it is necessary to constantly stir the solution containing cells, but currently the stirring is conducted by one-dimensional movement. There is a need for a rotation motion with sinusoidally changing the tilting angle of rotation axis. This study proposes a spherical motor to realize the rotation motion and has developed a prototype spherical motor of this type. The proposed spherical motor is driven by the electromagnets excited by five-phase alternating currents. This paper describes the structure of proposed spherical motor, its driving principle and rotation experiments of the developed prototype of spherical motor.

　Six-pole active magnetic bearings (AMBs) have fewer poles than usual eight-pole AMBs, then, it is easier to miniaturize and suitable for small motors. However, because the magnetic circuit of the six-pole AMB is difference in the x- and y-directions, the calculation of coil currents becomes complex. In this paper, control currents of the six-pole AMB are calculated by nonlinear programming method. The power consumption is set for an objective function, and the magnetic bearing forces and current limits are set for constraint function. Sequential quadratic programming is implemented to the experimental setup, and a stable levitation is achieved by real time calculation.

　The magnetic levitation motor has no friction or wear, it can realize high rotation speed with a very long duration. We use flexible PCB technology to improve the copper space factor and manufacturing accuracy of the magnetic levitation motor. We wound a flexible PCB sheet with an air-core coil printed on it around a back-iron to produce two windings pairs. The effects of errors during manufacturing cannot be ignored; it is necessary to anticipate mistakes and improve winding patterns. In this paper, we explained the motor’s structure and the structure of the flexible PCB and the error that occurs during the winding roll-up process. We clarified that the most massive error exists in the gap between the back-iron and the first sheets.

　As the quality characteristics of electric power steering (EPS) motors, the high average torque, small torque ripple, and small cogging torque are required. This paper develops a slot-less permanent magnet (PM) synchronous motor for EPS motor, which has theoretically 0 cogging torque. Basic dimensions are determined by two-dimensional finite element (2-D FE) analysis. The characteristic of the designed motor is analyzed by the 3-D FE analysis. The use of soft magnetic composite is proposed. The proposed slot-less motor is fabricated. The characteristic of the motor driven by a sensor-less control is clarified. The torque ripple is smaller than that of the commercialized EPS motor.

　Recently, a linear oscillatory actuator with two movers are developed and are applied as active vibration control devices that can reduce vibration in a wide frequency range. In the system, inertial force is controlled by using acceleration information on movers that obtained from acceleration sensors. In this paper, an acceleration estimation method using extended Kalman filter is suggested for sensorless control. The future of the suggested method is that nonlinear detent characteristics depending positions on two movers are considered in the state model of extended Kalman filter. As a result of online estimation using a controller and prototype, estimation values agreed with measured.

　For a totally-implantable artificial Heart (TIAH), the transcutaneous energy transmission system (TETS) and the transcutaneous communication system (TCS) are useful to reduce the risk of infection. Integration of TETS and TCS is expected to reduce patient’s burden, including miniaturizing the device. We have studied the two turns of the outer circumference of figure-eight coil for the integration of transdermal energy transmission and transdermal information transmission. In this study, a part of the two turns of the outer circumference of figure-eight coil is cut off to further reduce the effect of the magnetic field on information transmission by energy transmission. In addition, the magnetic field effects caused by the misalignment of the transdermal transformer are compared before and after cutting the circumstance of the coil in the information transmission system.

　In this paper, we will suggest new evaluation method for expressing relationships between magnetic flux density and magnetic field strength. The calculate equation is suggested in order to consider the amplitude and phase of permeability waveform. Although nondiagonal term of permeability tensor is nearly zero under the alternating magnetic flux condition, it has a value under the rotating magnetic flux condition. We will estimate the magnetic field strength vectors at arbitrary direction by using the permeability tensor waveforms. The estimated results under the alternating magnetic flux condition have same tendency in comparison with the measured results. However, the results under the rotating magnetic flux conditions differed because the nondiagonal term of permeability tensor having values.

　The authors have been proposed a new strain annealing method by using induced magnetic field with aim of developing a simple and short-time strain annealing technique for motor cores. In this paper, the stress relief annealing effect in the induced magnetic field heating method is examined in detail. At first, the magnetic properties of ring cores, heated with an electric furnace and the induced magnetic field heating method are compared. Next, the effects on difference of the heating conditions are examined.

　Several studies have reported the use of atmospheric pressure plasma irradiation for medical applications. Atmospheric pressure plasmas produced under atmospheric pressure, so they contain many neutral molecules, ions, and radicals. Radicals are highly reactive and have the property of damaging cancer cells. We have previously studied the effects of plasma-treated water irradiated with atmospheric pressure plasma on the colon cancer model rats. In this study, we investigated the mechanism of suppression of cancer progression by irradiating the culture medium of colon cancer cells with atmospheric pressure plasma.

　The purpose of this report is to produce a torque sensor that detects the torque applied to a minute diameter. A jig was manufactured to apply torque to a sample with a wire diameter of several mm. When various torques are applied to two FeCoV magnetic samples (φ8.5 mm and φ4.0 mm), the induced voltage tended to increase only for the sample of φ 4.0 mm. Reading this change may be applicable to a torque sensor that can detect the torque applied to a minute diameter.

　The authors have been studying non-contact hybrid brakes with combining eddy current brake and magneto-rheological fluid brake as the next generation brakes for aircraft. This paper deals with measure the brake torque using a cylindrical magneto-rheological fluid brake experimental machine and evaluated the shear stress and time constant characteristics. The shear stress increased when the particle size of the magneto-rheological fluid was small.