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f28027 + instaspin+ fly start 使用问题

           做风扇的foc矢量控制,现在需要在逆风下能够启动风扇,启动时由于外部风速较大导致风扇有100~200rpm的转速自运转,利用FLY_start 启动时,如果目标转速和风扇自转同向,风扇可以正常启动,但如果目标转速与风扇自转转速反向时,由于外部风速较大,风扇启动失败,无法达到我的目标转速,请问该问题如何解决?