What are the advantages & disadvantages of synchronous motors?

Its starting torque is zero. These motors have tendency to hunt. When loading on the synchronous motor increases beyond its capability, the synchronism between rotor and stator rotating magnetic field is lost and motor comes to halt. Collector rings and brushes are required resulting in increase in maintenance.

What is the purpose of a synchronous motor?

In higher power industrial sizes, the synchronous motor provides two important functions. First, it is a highly efficient means of converting AC energy to work. Second, it can operate at leading or unity power factor and thereby provide power-factor correction.

What are the advantages of asynchronous motor?

As for the Asynchronous Motor, the cost is very low, the process is simple, the operation is reliable, and the maintenance is convenient. It can work in a complex working environment and has a relatively strong ability to adapt to large changes in the surrounding operating temperature.

What are the benefits of a permanently excited synchronous motor?

This motor has low torque ripple so it can generate constant torque. Also its ability to maintain full torque at low speeds. Permanent magnet motor full-load efficiency is higher than an AC induction motor.

Which is better synchronous or asynchronous motor?

Synchronous motor is costly as compared to Asynchronous motor. Efficiency of Synchronous motor is greater than Asynchronous motor. By changing excitation the power factor of the Synchronous motor can be adjusted accordingly as lagging, leading or unity, whereas Asynchronous motor runs only at a lagging power factor.

What is synchronous versus asynchronous?

Synchronous = happens at the same time. Asynchronous = doesn’t happen at the same time. With asynchronous learning, the participants can learn at their own pace.

What are the advantages of an over excited synchronous motor?

An over excited synchronous motor can have leading power factor and can be operated in parallel to induction motors and other lagging power factor loads thereby improving the system power factor. In synchronous motor the speed remains constant irrespective of the loads.

What is the difference between synchronous motor and induction motor?

In industries induction motors are employed mostly because of less cost, rugged construction, good starting torques and very less maintenance. Synchronous motors are rarely used in industries for drive applications. They are generally used as power factor correction device. In industries they are employed to improve the power factor of the system.

Why synchronous motors cannot be used for variable speed applications?

These motors cannot be used for variable speed applications as there is no possibility of speed adjustment unless the incoming supply frequency is adjusted (Variable Frequency Drives) Synchronous motors cannot be started on load.

What is the function of the rotor of synchronous motor?

It protects the motor and covers the whole assembly. The operation of a synchronous motors is that the rotor follows the rotating magnetic field of a stator and rotates at a speed approaching it. The rotor winding is excited by a DC source and the stator winding is excited by AC source.