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针对地铁列车牵引系统中的交流牵引电机最小能耗问题,提出了一种最大转矩电流比控制目标下的励磁电流给定策略,该策略可使电机高效平稳运行于恒转矩区、恒功率区和恒电压区。根据牵引电机在不同转速下的牵引特性曲线,充分考虑电机本体的最大电压、最大电流的限制和磁场电流对互感的影响,设计出优化的励磁电流给定,使得输出最小的电机电流获得同样的转矩性能。仿真和试验结果证明电机在全速范围内可稳定运行,并且电机在各速度点给定转矩的情况下,输出电流比设计值小。
Aimed at the minimum energy consumption of AC traction motors in the train traction system of metro train, a strategy of exciting current under the target of maximum torque current ratio is proposed. The strategy can make the motor operate efficiently and steadily in constant torque region, constant power Zone and constant voltage zone. According to the traction characteristic curve of the traction motor at different speeds, the optimal excitation current is designed considering the maximum voltage of the motor body, the limitation of the maximum current and the influence of the magnetic field current on the mutual inductance, so that the output minimum motor current can obtain the same Torque performance. Simulation and test results show that the motor can operate stably in the full speed range, and the output current of the motor is smaller than the designed value under given torque of each speed point.