内置式永磁同步电机MTPA和弱磁控制

MTPA and Flux-weaken Control for IPMSM

永磁同步电机(PMSM)的矢量控制恒转矩控制常用两种控制方式:弱磁控制和最大转矩电流比(MTPA)控制。内嵌式永磁同步电机(IPMSM)输出的转矩包含部分磁阻转矩,在相同转矩输出情况下,MTPA控制所需定子电流小于弱磁控制的定子电流,这样就实现了最小铜损。当车速达到额定转速后,电机受到电池电压的限制,恒转矩控制策略无法实现电机转速的继续上升,此时电机进入恒功率运行区,通过弱磁控制策略实现在电压受限条件下的电机转速上升。提出了在低转速和无需足够大扭矩时使用MTPA控制;在转矩输出要求很大时,使用最大电流输出控制;超出额定转速后,使用最大功率输出控制,即最大电压转矩比(MTPV)控制。

Constant torque control of vector control in permanent magnet synchronous motor（PMSM） is commonly used in two control modes ：flux-weaken control and maximum torque per ampere （MTPA） control.Output torque of interior PMSM （IPMSM） includes part of reluctance torque, under the same torque output, stator current of MTPA control is less than flux-weaken control,so as to realize the minimum copper loss.When the speed reaches the rated speed,the motor is limited by battery voltage, constant torque control strategy can＇t realize the continued rise in motor speed.At this time ,the motor is in constant power operating range.Under the condition of voltage limitation ,the motor speed is increased by the flux-weaken control strategy.MTPA control is used when the motor is at low speed and does not require large torque, maximum current output control is used when the torque output is large, and maximum power output control, as well as maximum torque per voltage （MTPV） control is used beyond the rated speed.