How do you change the speed of a slip ring motor?

How do you change the speed of a slip ring motor?

Speed Control by Rotor Rheostat Control With the same rheostat added to the rotor circuit, it is possible to regulate the speed of slip ring motors. The resistance is engaged maximum during starting and slowly cut-off to increase the speed of the motor.

What are the methods of speed control of induction motor?

Speed Control Methods of Induction Motor:

• Control From Stator Side:
• Control From Rotor Side:
• Speed Control by frequency variation:
• Speed Control By Pole Changing:
• Speed control by varying Supply voltage:
• Speed control by varying Rotor Resistance:
• Speed control by injected EMF:
• Speed control by Cascade Connection:

How can we change the speed of squirrel cage and slip ring induction motors?

The interaction of the magnetic fields produced by the stator and rotor windings produces a torque on the squirrel cage rotor. One big advantage of a squirrel cage motor is how easily you can change its speed-torque characteristics. This can be done by simply adjusting the shape of the bars in the rotor.

Which is used for continuous speed control in case of slip ring induction motor?

The method that gives continuous speed control of a slip-ring induction motor is. (a) rotor resistance control.

What is slip power recovery method of speed control of slip ring induction motor?

The slip energy recovery method provides the speed control of a slip ring induction motor below its synchronous speed. A portion of rotor AC power (slip power) is converted into DC by a diode bridge. The smoothing reactor is provided to smoothen the rectified current.

How does slip ring induction motor works?

Working of Slip Ring Induction Motor When a stator winding is excited with an AC supply, the stator winding produces magnetic flux. Based on faraday’s law of electromagnetic induction, the rotor winding gets induced and generates a current of magnetic flux.

How do you control the speed of a synchronous motor?

We can achieve the speed control of synchronous motor either by changing the number of Stator poles or changing the frequency of AC supply. Varying the frequency is a feasible way for speed control of the synchronous motor. Using the rectifier and inverter combination, we can vary the frequency of AC supply.

What happens if the slip of induction motor is 1?

Slip = 1, means that rotor is stationary. Negative value of slip in induction motor can be achieved when the rotor speed is more than the synchronously rotating magnetic flux. This is only possible, when the rotor is rotated in the direction of rotating magnetic flux by some prime mover.

How is speed control of slip ring induction motor?

Speed Control of Slip Ring Induction Motor 1) By Varying External Resistance: We know that a motor uses an external high resistance circuit for producing high… 2) Using Thyristor Circuit: The Speed control of this motor is controlled by using a thyristor ON/OFF circuit. It is…

How does increase in slip affect motor speed?

This increase in slip is nothing but decrease in motor speed. But there are some disadvantages in this method of speed control. As the rotor resistance is increased, the “I^2 * R” losses also increases which in turn decreases the operating efficiency of the motor.

Why do slip ring motors have low starting torque?

But in case of slip ring motors, the rotor resistance is increased by the addition of external resistance. This external resistance makes the rotor circuit current low and thus the stator current drawn is also low with a high starting torque.

What makes a slip ring motor phase wound?

A slip ring motor or a phase wound motor is an induction motor which can be started with full line voltage, applied across its stator terminals. The value of starting current is adjusted by adding up external resistance to its rotor circuit.

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