Some of YDT series motors have a single winding,and others have two independent windings, through change the connection of wires, which are marked on the inner side of terminal lid, the motors will be changed to different poles, thus it runs under different speed with different output power. YDT series motors have lots of futures such as large starting torque, excellent performance, low noise and vibration, high reliability, easy operation and etc. YDT series motors are widely used in the mechanism which needs stepped一speed adjustment, such as compressors,machining equipments, transportation system，agricultural mechanism, food processing mechanism etc. We also supply special designed multi一speed motors according to customers' unique requirements. Operating conditions of YDT series motors are the same as Y2 series three phase asynchronous motors