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小型压缩机一般选用异步电机拖动,容量在250（?）以下。中型、大型压缩机一般选用同步电机拖动,容量在250（?）以上。二者相比较,同步机有价格高、电气传动设备复杂,启动困难等缺点,所以一般小型压缩机不采用它来拖动。但同步机亦有它独特的优点,即可以在功率因数cosφ越前下运行,补偿电网的无功电流。对于容量大、长期连续运行的中、大压缩机负载来说,这种特性就很可贵,它可以提高电网的功率因数,减轻电网的无功负担及相应提高线路电压等等。一般运行二至三年的经
Small compressors generally use asynchronous motor drag capacity of 250 (?) Below. Medium-sized, large compressors generally use synchronous motor drag capacity of 250 (?) Above. Compared with the two, there are high price of synchronous machines, electrical transmission equipment complex, difficult to start and so shortcomings, so the general small compressors do not use it to drag. But the synchronous machine also has its unique advantages, that is, it can run ahead of the power factor cosφ to compensate the reactive current of the power grid. For large capacity, long-term continuous operation of medium and large compressor load, this feature is very valuable, it can improve the grid power factor, reduce the reactive power burden on the grid and the corresponding increase in line voltage and so on. General operation of two to three years of experience