Repulsion Induction Motor | Working, Advantages and Application
Repulsion motor is one type of induction motor which is used more in industries. Working, Advantages and Application are provided below in detail.
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| Repulsion Induction Motor | Working, Advantages and Application |
A single-phase repulsion-induction motor combines the constant-speed characteristics of the single-phase induction motor with the good starting characteristics of the repulsion
motor.
The stator of this machine has a simple single-phase winding like that of single-phase
induction motor.
The rotor, however, is built up of laminations, each of which has two concentric sets of slots.
These slots contain two distinct windings; in the outer slots is wound a commutator winding similar to that of D.C. armature, while in the inner slots is a cast aluminum squirrel-cage winding which clamps the laminations.
Figure illustrates an armature for a repulsion induction motor complete with a
squirrel-cage winding.
At starting and during the acceleration period, the magnetic flux produced by the stator
embraces only the commutator winding in the outer slots owing to the high reactance of the squirrel-cage.
The motor starts up virtually as a repulsion motor and develops a high starting torque.
As the motor speeds up the reactance of the squirrel-cage decreased, so that this winding assists the commutator winding to supply the running torque.
Advantages of Repulsion Motor
The repulsion-induction motor has the following advantages
✓High starting torque.
✓Fairly good speed regulation.
✓Major virtue is the ability to continue to develop torque under sudden, heavy applied load without breaking down.
Application of Repulsion Motor
Such motors are suitable for all single-phase power applications which require a high
starting torque and constant speed when running.
They also operate at a very high power factor.
They are particularly well adapted to drive.
machine tools, lifts hoists, mixing machines, centrifugal pump, fans and blowers.
