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BLDC 反电势波形不是 梯形波

如图是在做 无感BLDC 空载开环拖动的波形 采用 HON-LPWM 方式调制

从图上可看出 反电势波形却不是梯形波 很疑惑 按理说不应该啊
期待大神 能给个解释 到底正不正常