Slip Ring Motor

A slip ring motor is a type of AC (alternating current) motor, commonly used in applications where high starting torque or variable speed is required. It is a type of squirrel-cage induction motor but has the added feature of slip rings and brushes to allow for external resistance to be applied to the rotor circuit.

Key features of slip ring motors include:

1. Slip Rings and Brushes: Unlike squirrel-cage motors, slip ring motors have slip rings that are attached to the rotor. These slip rings are connected to external resistors through brushes, which allows for the control of current in the rotor circuit.

2. External Resistance: The addition of external resistance to the rotor circuit helps control the motor’s speed and torque characteristics, especially during startup. This feature allows slip ring motors to have higher starting torque compared to other induction motors.

3. Application: They are commonly used in applications requiring high starting torque, such as cranes, hoists, elevators, and pumps. The slip ring design also helps in controlling speed in various industrial settings.

4. Advantages:

International motor standards

– High starting torque.

– Easier control of speed through external resistors.

– Better performance in applications requiring heavy duty starting.

5. Disadvantages:

Explosion-proof motors

– Maintenance requirements due to brushes and slip rings.

– Higher cost compared to squirrel-cage motors.

– Potential wear and tear of the brushes and slip rings over time.

Slip ring motors are generally chosen for heavy-duty applications where the benefits outweigh the maintenance challenges.