마이크로 스텝을 이용한 영구자석 여자 횡축형 선형 전동기의 동특성에 관한 연구
電氣工學科 電力電子 專攻
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As PM excited Transverse Flux Motor is high efficiency and high power motor, efficiency is high more 10% than existing motor and power rate( motor power/motor weigh=kW/kg) is high more than three times. This motor application part is linear compressor, ropeless elevator, light electric railroad and subway thrust system, automatic door, semiconductor equipment and so on. Motor of these is essential control function. But, by imperfection or inequality on manufacture in practical PM Excited Transverse Flux Motor, Flux distribution by permanence magnet is appeared to nonlinear. Therefore, if thrust ripple happens, accuracy of velocity control or position control is decreased. This paper is used algorithm that use PID control and Microstep control to reduce thrust ripple Not only the position accuracy by the microstep control can be improved but also the vibration and the noise at the low speed region can be decreased. For the microstep control we adopted the hysterics control method which controls the excitation current Through the application of this kind of microstep control method into PM excited Transverse Flux Motor the following performances were obtained. (1) high accuracy position control (2) protection against step out by resonance at low speed region (3) response characteristics improvement The theoretic formula of the position error analysis was clearly established by obtaining the thrust force from the PM excited Transverse Flux Motor magnetic equivalent circuit. And the following causes of position error was also analysed by the formula. (1) error by pole pitch error (2) error by unbalance of air gap permeance (3) error by load thrust force (4) error by the unbalance between of thrust force Form the various characteristics analysis and experiment results of the PM excited Transverse Flux Motor microstep control, we obtained the more improver high accuracy position control system as well.