Question

What are the advantages of a Slip Ring Induction Motor?

Answer 1

A winding rotor motor, sometimes known as a slip ring induction motor, is a form of induction motor. Slip rings connect the rotor winding to external resistance in this motor. The external resistor can be used to control the motor's speed and torque. Because of the higher torque circuit resistance, the slip ring induction motor requires a low starting current. The spindle resistance can be reduced by employing an external variable resistor after the motor has reached a certain speed.

Complete step-by-step solution:
Advantages of slip ring induction motor:
Starting current is low: The rotor winding of a slip ring induction motor is connected to the outer high variable resistor by slip rings, resulting in a lower beginning current.
Controlling the speed: Because this motor contains an integrated variable resistor, it may be utilized as a speed controller without the usage of an external speed controller. As a result, this motor's speed can be adjusted more simply than other motors.
Acceleration is smooth: The motor starting moment absorbs the least amount of electricity, resulting in a low motor starting speed. When the rotor current is increased, the motor accelerates smoothly under heavy load.
High torque during start-up: Because the resistance of the rotor winding is raised by adding external resistance, the slip ring induction motor has a high beginning torque. As the power factor of the rotor circuit improves during startup, the beginning torque increases.

Additional Information:
Disadvantages:
Regulation of speed: This motor speed controller uses a variable resistor approach, which isn't ideal for industrial use.
Price: When compared to squirrel cage induction motors, this motor has a higher startup and maintenance cost. Because a slip ring induction motor requires more brushing and slip rings than conventional motors, it is more expensive.
Heat: In comparison to squirrel cage induction motors, slip ring induction motors have poor heat regulation.
Large space: Because the motor and the speed-controlling resistor are both in the same unit, this motor requires a lot of room.

Note:
Applications:
When compared to dc series motors, induction motors have a lower starting torque. When compared to squirrel cage motors, slip ring induction motors offer a significant advantage in terms of starting torque. As a result, slide ring induction motors are commonly used where a load necessitates a strong beginning torque or precise speed control.
Hoists,
Elevators,
Compressors,
Printing presses,
Huge ventilating fans,
loads
that require speed control, such as driving lifts and pumps, all use them.