What Is a Slip Ring Motor?

What Is a Slip Ring Motor?

A Slip Ring Motor, also known as a Wound Rotor Induction Motor, is a type of AC motor that uses slip rings and external resistors to control its starting torque and speed. It is widely used in industries that require high starting torque and smooth speed control, such as cranes, mills, and conveyors.

Key Components of a Slip Ring Motor

• Stator: The stationary part that produces the rotating magnetic field.
• Rotor (Wound Rotor): Contains three-phase windings connected to slip rings.
• Slip Rings and Brushes: Provide an electrical connection between the rotor and the external resistance circuit.

How Does a Slip Ring Motor Work?

When AC power is supplied to the stator, it creates a rotating magnetic field. This field induces current in the rotor windings, generating torque. By connecting external resistance through the slip rings, the rotor current and torque can be controlled. Once the motor reaches the desired speed, the resistance is short-circuited, and the motor runs similarly to a squirrel cage motor.

Advantages

• High and adjustable starting torque.
• Smooth acceleration under heavy load conditions.
• Speed control over a certain range.

Disadvantages

• Requires more maintenance due to slip rings and brushes.
• Higher initial cost than squirrel cage motors.
• Possible sparking at brushes during operation.

Common Applications

• Cranes and hoists
• Conveyors
• Compressors
• Mills and crushers
• Elevator systems

Slip Ring Motor Testing, Repair & Maintenance

At KH Venture, we specialize in slip ring induction motor testing, rewinding, and commissioning services. Our experienced team ensures reliable performance and extended lifespan for your rotating equipment. Whether for industrial plants, mills, or heavy-duty machinery, we deliver quality maintenance and repair solutions.

📞 Contact KH Venture today for professional slip ring motor service and technical support.