Methods of Starting of Synchronous Motor
Synchronous motors do not start themselves by nature. As a result, it needs an additional starting method. A synchronous motor can be started using one of the two methods below:
- Using an external prime mover first
- Initially, damper windings
Synchronous Motor Starting with an External Prime Mover
- This method involves driving the synchronous motor with a third-party motor.
- After the synchronous motor has been brought to synchronous speed by the external motor, it is synchronized with the AC supply to function as a synchronous generator. Next, the outside motor, also known as the prime mover, is disconnected. The synchronous machine functions as an engine once it is synchronized.
- At this point, the synchronous motor’s shaft can be attached to the mechanical load. Since the load has been removed from the synchronous motor prior to synchronization, the prime mover motor only has to get past the momentum of the synchronous motor in absence of a load. Therefore, the rating of the starting motor or prime mover is substantially lower than that of the synchronous motor.
Synchronous Motor Starting with Damper Windings
- The most common method to start a synchronous motor is with damper windings. A damper winding is composed of heavy copper bars that fit into slots cut into the rotor’s pole faces. This configuration of copper bars and end rings creates a squirrel cage winding because those copper bars are subsequently short-circuited by end rings at the two ends of the rotor. The synchronous motor with damper winding will initially operate as a three-phase squirrel lock induction motor when its armature is linked to a three-phase supply.
- The DC field excitation is applied to the rotor field windings when the motor reaches a speed that is closer to the synchronous speed. After that, the motor runs at synchronous speed as the rotor follows the magnetic field of the frame as it rotates.
Synchronous Motors
An electric motor that operates at a constant speed is known as a synchronous motor as the frequency of the AC voltage that is used and the rotor rotation are synchronized. The fixed connection between the stator and rotor magnetic fields is maintained by it. Imagine a world free of electricity, where every job is carried out by hand. Let us imagine for a moment a device that both is simple and moves in time with the electrical beat: a synchronous motor.
A Synchronous motor is fundamentally a fascinating electrical device that synchronizes with the rise and fall of electric currents. It synchronizes its rotation with the frequency of the alternating current, like a partner in dance following each step, forming a smooth transition between the electrical world and the physical world we live in. Its synchronous dance style separates it from its asynchronous equivalents, offering an accurate symphony in performance.
Imagine your daily ritual, the soft sound of your blender, and the grinding sound of your coffee grinder. The appealing mechanisms of synchronous motors, which silently power these appliances with a precision similar to a well-choreographed dance, are hidden behind these accepted sounds. Synchronous motors, in contrast to their asynchronous counterparts, are able to keep a firm hold on time, which enables them to rotate in perfect sync with electrical beats for dependable and efficient efficiency.
Table of Content
- What is a synchronous motor?
- Construction of synchronous motor
- Operations of synchronous motor
- Methods of starting Synchronous Motor
- Applications of synchronous motor
- Bringing synchronous Motors Up to Speed
- Types of Synchronous Motors
- Difference between Synchronous motor and Induction motor