LAUSR

Arc permanent magnet (PM) motors show good prospects in large telescope application. To explore an appropriate arc PM motor (APMM) used in the large telescope drive, this article investigates a variable flux APMM (VFAPMM) with dual-PM excitation (DPM-VFAPMM). The DPM-VFAPMM incorporates the merits of the APMM, the hybrid excited motor, and the DPM excited motor. The motor structure and working principle of the DPM-VFAPMM are described. Then, a special winding cross-connection method is adopted to mitigate the torque ripple caused by the end effect. Finally, the electromagnetic performances of the DPM-VFAPMM, the rotor-PM VFAPMM, the stator-PM VFAPMM, and the surface-mounted-PM VFAPMM are investigated and compared. The comparison results show that compared with the other three motors, the DPM-VFAPMM shows the highest flux linkage, the highest back electromotive force, the highest average torque, the highest efficiency, and the second lowest torque ripple. Simultaneously, the DPM-VFAPMM shows high torque/effective PM usage. The advantages of high average torque and low torque ripple show that the DPM-VFAPMM is suitable for the potential application of the large telescope drive.