What is a repulsion start induction motor?
What is a repulsion start induction motor?
“The Repulsion Start Induction motor comprises a wound field or stator of laminated structure and a wound armature or rotor whose coils are connected to a commutator upon which brushes bear and function during the starting period. Consequently this type of motor is regarded as having a high efficiency at start.
What happens in the repulsion motor starting method?
Explanation: The repulsion motor starting method is one of the methods used in the starting of the single phase induction motor. Here the cage winding is replaced by the commutator windings. The commutator windings are dominant and hence gives good starting torque.
What are the application of repulsion start induction motor?
electric trains
The main application of repulsion motor is electric trains. It starts as a repulsion motor and runs as an induction motor, where the starting torque should be high for a repulsion motor and very good running characteristics for an induction motor.
What does repulsion motor do?
A repulsion motor is a type of electric motor which runs on alternating current (AC). It was formerly used as a traction motor for electric trains (e.g. SR Class CP and SR Class SL electric multiple units) but has been superseded by other types of motors. Repulsion motors are classified as single phase motors.
Where is repulsion induction motor used?
The main application of repulsion motor is electric trains. It starts as a repulsion motor and runs as an induction motor, where the starting torque should be high for repulsion motor and very good running characteristics for induction motor.
Why does an induction motor need a starter?
A starter is needed for a three phase induction motor because at the time of starting, if induction motor is started directly, it will draw a huge amount of current which can cause damage to adjoining equipments. Hence initailly induction motor will draw heavy amount of current.
How can an induction motor be “self starting”?
This rotating magnetic field links to the rotor coils and induces voltage which in turn produces current in the rotor. The current carrying rotor being placed in a magnetic field experiences a torque and hence begins to rotate in the direction of rotating magnetic field. Thus we see that Induction Motor is self-starting .
How do you control the speed of an induction motor?
Synchronous speed of the induction motor depends on the number of poles in the motor of stator side and the frequency of the motor on the supply side. So by changing the supply frequency of the motor you can control the speed of the motor.
What type of starter is used in an induction motor?
Direct On Line Starter. It is simple and cheap starter for a 3-phase induction motor.
