What is a key feature of synchronous motors?

Synchronous motors are characterized primarily by their ability to maintain a constant speed in relation to the supply frequency. This means that the motor's rotor turns at the same rate as the rotating magnetic field produced by the stator. The speed of the synchronous motor is determined by the frequency of the electrical supply and the number of poles in the motor, allowing these motors to run at a fixed speed across various loads.

This unique feature is particularly advantageous in applications that require precise speed regulation, such as in electric vehicles, synchronous condensers, and precise machinery. While load changes can influence torque in a synchronous motor, they do not affect the constant synchronous speed, making them distinct from other types of motors, such as induction motors, which experience speed variations with changes in load.

Therefore, the aspect of constant speed operation regardless of load is a defining characteristic of synchronous motors, underscoring their reliability in applications where maintaining speed is critical.