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同步电动机较异步电动机有突出的优点:(1)可以在功率因数超前的情况下运行,对提高企业用电的功率因数有相当大的作用。(2)同步电动机的转矩受电网电压波动的影响比异步电动机小;因为同步电动机的转矩与电网电压u的一次方成正比,而异步电动机的转矩则与电网电压u的二次方成正比;这在电压波动比较大,电压偏低的地区更显示出它的优点。(3)可采用极数较多的转速较慢的同步电动机直接和设备连接,而不需要减速机。如矿山的球磨机、空气压缩机等都使用这样的同步机,使设备组合简单、维修工作量小。(4)同步电动机的转速
Synchronous motor than asynchronous motor has outstanding advantages: (1) can run in power factor ahead of the situation, to improve the power factor of the enterprise has a considerable effect. (2) The torque of the synchronous motor is less affected by the fluctuation of the grid voltage than the asynchronous motor. Because the torque of the synchronous motor is proportional to the square root of the grid voltage u, the torque of the asynchronous motor is proportional to the square of the grid voltage u Is proportional to; This voltage fluctuation is relatively large, the voltage is low in the region even more shows its advantages. (3) can be used more poles slower synchronous motor directly connected with the device, without the need for reducer. Such as mine ball mill, air compressor, etc. use such a synchronous machine, the device combination is simple, small maintenance workload. (4) synchronous motor speed