We combined two armatures in a linear motor that generated thrust in one direction; this combination was made possible by the use of a right angle. Since the motor was designed as an X-Y linear motor, we used a permanent magnet in the mover in order to obtain a comparatively high thrust, and carried out research with the aim of realizing an X-Y linear synchronous motor (X-Y LSM). The most suitable conditions for obtaining the maximum possible static thrust were found by measurement and analysis, and the following items are examined in relation to the static thrust: (1) displacement and its relation to the static thrust, (2) back iron thickness and its relation to the static thrust, (3) magnetic gap and its relation to the static thrust, (4) excitation current and its relation to the static thrust. Static analysis by the three-dimensional finite element method was applied to the analytic technique.
A narrow-gap read head with a high-resistance magnetic film was investigated. The film has a resistance of more than 10 m Ω cm and good soft magnetic properties. The high-resistance shield head comprises a GMR film, insulator films for the read-gap, high-resistance magnetic films, insulator films to prevent breakdown of the head, and magnetic shield films. The fabricated high-resistance shield head shows a good output waveform. However, it has a slightly larger half-amplitude pulse width (PW50) value than a conventional shield head, because the permeability of the high-resistance magnetic film is insufficiently high. We concluded that a read head using a high-resistance shield with high permeability would be a suitable candidate for a narrow-gap read head.
We developed a new system to capture jaw movement. It consists of two magnets and biaxial fluxgate sensors. A magnet is fixed to a tooth in the bottom jaw of the subject and another is fixed to the subject's forehead. The system can naturally detect movement of the jaw as a rigid body, because it does not require such attachments as a clutch inside the mouth or a magnetic field sensor array in contact with the head. In this paper, we investigate five error sources of the jaw-tracking system, using a jaw model, and report the achievement of a positional accuracy of 1.5 mm and an axial accuracy of 2 degrees. Positional accuracy within 2 mm is achieved as a rigid body.