关键词: 内置式永磁同步电动机, 直接转矩控制, 损耗模型, 损耗极小

Abstract:

To solve the low efficiency problem of interior permanent magnet synchronous motor drive system operating in light load, a direct torque control of interior permanent magnet synchronous motors incorporating loss minimization strategy was proposed. The IPMSM model considering iron loss was established by analyzing the relationship among power loss and speed, torque, stator flux linkage. Then the optimal stator flux calculation formula was deduced, which maked the motor power loss minimum according to the model. The optimal stator flux calculation module was embedded into direct torque control system, then the loss minimization control of direct torque control drives for IPMSM was realized. The experimental results show that the proposed control method not only preserves the fast dynamic response of traditional direct torque control, but also improves the efficiency of the motor operating in light load condition.

Key words: interior permanent magnet synchronous motor, direct torque control, power loss model, loss minimization