A synchronous motor's speed varies very little under normal loading. So a synchronous motor is used in applications where having a constant speed is critical. It doesn't not tolerate "slip". It tries to keep the rotor "locked" in synch with the magnetic fields generated by the stator (Zero slip). A synchronous motor is started as an asynchronous motor. When it gets to full speed asynchronous speed, the synchronous field is brought in. This causes the rotor to "lock" in sync with the rotating magnetic field of the stator, hence the motor's speed is constant.
An asynchronous motor's speed will vary with load. The heavier the load on the motor, the lower the motor's speed and hence, the greater the "slip". It is "slip" that allows an asynchronous motor to develop torque. Without slip, the asynchronous motor would not rotate. This motor is used in applications where a constant speed is not critical. With modern variable frequency drives (VFD), the speed issue is less critical. A properly designed VFD setup can use an asynchronous motor to replace a synchronous motor. Since an asynchronous motor has few parts, it is cheaper to build and easier to maintain. Since most applications are not speed critical, most motors are of the asynchronous type. Bill Lee wrote: >Hi, >Can someone tell me what is the differences between Synchronous and >Asynchronous motor ? A regular motor used in a factory is Synchronous or >Asynchronous ? >Thanks. > >Regards, >Bill Lee > > -- Author: Dan INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
