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FOC驱动PMSM

利用双环控制驱动PMSM,当速度给定变化很快时,刚开始速度可以正常跟踪,隔一段时间后速度无法正常跟踪指定速度,而是维持在某一个特定的速度?这是为什么?(我要求电机在200~40000rpm之间任意快速变化)