关键词: 电气工程, 电传动, 永磁电动机, 绕组换接, 有限元方法, 电路设计

Abstract: Under the circumstances that volume and power are being limited in armored vehicles, large torque and wide flux-weakening range become conflict inevitably in permanent magnet motors. The motor winding switching method is adopted to resolve this problem. The motor performance of torque and flux-weakening was analyzed by finite element method (FEM) which windings are connected in parallel and series respectively. The results show that the output torque of the motor in series-wound mode is twice as much as that in parallel-wound mode, while the speed range of the motor in series-wound mode is half as much as that in parallel-wound mode. Thus, both of torque and speed range can be satisfied utilizing the winding switching method. The series-wound mode can be used in low speed to increase output torque of the motor, while the parallel-wound mode can be used in high speed to widen the speed range of the motor. What’s more, a switching circuit is constructed based on zero current switching to fulfill the winding switching. The experimental results show that the switching is very rapid and the impulsion is small during the switching process.