| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 106 === This thesis presents the design of dual three-phase permanent-magnet assisted synchronus reluctance motor (PMASRM) drives. Two three-phase inverters are both controlled by one digital signal processor, TMS320F28069. Linear hall-effect and current sensors are used to feed back rotor position, speed and motor currents. The maximum torque per ampere as well as speed and current closed-loop controls are proposed to set the quadrature- and direct-axis currents to promote system performance. In addition, the post-fault control is conducted by determining and disconnecting the faulty three-phase winding via the feedback currents. The reduced-load operation of the normal three-phase winding thus enhances the system reliability accordingly.
Matlab/Simulink is used to analyze the control system for dual three-phase PMASRM. The control strategy programmed by C language can reduce circuit components. The experimental results show that when the speed and the load are at 600 rpm and 6.60 N-m, respectively, the corresponding peak phase-currents of the dual three-phase windings are 9.40 A and 9.53 A, the magnetic torque is 2.76 N-m, reluctance torque is 3.89 N-m and system efficiency is 72.50%. Moreover, when the speed and the load are at 600 rpm and 3.4 N-m, respectively, the peak phase-current of the motor is 10.35 A as the faulted three-phase winding is disconnected, yielding the system efficiency of 72.66%. In short, the simulation and experimental results have verified the feasibility of the proposed system.
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