140DDO84300
140DDO84300
140DDO84300
这是不允许的。永磁电机体积小是其永磁体特性的结果。还有个特点即其启动力矩大？原因在于伺服启动器能准确找到磁极位置，使定转子磁极正交，大出力。找到磁极就需要伺服里的传感器起作用。伺服还有个特点，其定子电阻相较异步要小得多，一般在毫欧姆级别。
当将工频电源加入永磁电机时，可以想象会产生多大的电流，而且开环的工频没有找准磁极时，转矩也不可能够大，启动速度也较慢，这时电机肯定会烧坏。
有心的可以比较下西门子异步电机和同步电机的特点。
但伺服电机也可以进行开环控制，比如用mm440拖动伺服电机，曾有篇帖子讨论过，不累述了。
无编码器伺服电机控制时，就是先开环，然后进行闭环伺服控制的。
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Allen-Bradley 厦门泰尼电气有限公司
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