2相リニヤモータの磁界ならびに1次各相間相互誘導の特異性

抄録

A large capacity linear induction motor is used mainly in high speed vehicles, but a small capacity linear motor excited by two-phase voltage sources may be used as a translational servo-motor without an additional mechanism to change a rotational motion to a translational motion.
In this report the authors explain the experimental results concerning the air gap magnetic field related to the drive-force estimation and the mutual inductance between the primary windings which is peculiar to the two-phase linear motor. The investigation concerned with the variation of the air gap flux distribution and with the change of the mutual inductance between the primary windings when the core tooth number and the primary coil arrangement were varied. The experiments were carried out with the faced core type two-phase linear induction machine having a balanced two-phase winding under a balanced two-phase excitation.
The calculated values according to the formulae in this report and the experimental values coincided closely. It has been verified that the unbalance of amplitude and phase angle of the air gap flux density and the arising of the mutual inductance are due to the magnetic property of the discontinuous stator cores.
The stator with a balanced two-phase winding may be operated with a single phase by attaching a condenser. The performance and the characteristics in the single phase operation are similar to those in the two-phase operation. The small size linear motor used as servo-motor or position control device will probably be driven by the single phase source. The information in this report will surely be useful in the future development of small size linear motors.