How does a 3 speed induction motor work?

How does a 3 speed induction motor work?

How it works. To actually achieve torque at the motor shaft, a current is applied across the stator. This creates a rotating magnetic field which in turn induces a current in the rotor. Because of this induced current, the rotor also creates a magnetic field and starts to follow the stator due to magnetic attraction.

What are the two kinds of multi-speed induction motors?

Multi-speed motors come in two basic varieties. The first has an extra set of windings, called a booster winding, that behaves like a transformer. The second variety comes with two distinct separate sets of windings.

Is the tap on a multi pole motor energizing?

Is the tap on this sort of multi-pole motor energizing some fraction of the total number of poles or is the tap putting more or less turns on the same number of poles? With one end of the triple tap coil tied to Neutral through the capacitor, how do you produce three speeds (High, Medium, and Low) using the two other two taps?

How does speed control of a phase induction motor work?

These two stator windings are electrically isolated from each other and are wound for two different numbers of poles. Using a switching arrangement, at a time, supply is given to one winding only and hence speed control is possible. Disadvantages of this method are that the smooth speed control is not possible.

How are pole pairs changed in an induction motor?

Pole changing method is a speed control scheme of induction motor. In this scheme, the number of pole pairs is changed by changing the field connection.

How does pole changing method provide speed control?

Since the number of pole pairs can only be changed in steps like from 2 to 4, this scheme provides stepped speed control. Generally, speed control using pole changing method is restricted to two steps. To better understand the basic concept of pole changing; let us consider a magnetic circuit as shown below.