Repulsion Motors: What You’re Missing Out On

A repulsion motor is a type of AC motor that repels similar poles. These motors have been used in a variety of applications, including as traction motors in electric trains. More recent types of electric motors have resulted in repulsion motors becoming obsolete in some settings, but they still have their uses and benefits and are important to consider for your operation.

Here’s an overview of what you should know about repulsion motors so you can determine if they’re right for your application.

What is a repulsion motor?

As mentioned above, a repulsion motor is a type of single-phase electric motor, which works by providing input AC power. In the motor, the direction of rotation for the motor is the same as that of the brush shift.

Repulsion motors are built with a stator, rotor and commutator brush assembly. The stator in this setup carries a single-phase winding, which is similar to the type of main winding you’d find in a single-phase induction motor. The rotor features distributed DC winding that is hooked up to the commutator at one of its ends, as you would find in the DC motor. The brushes are short-circuited on themselves, and are conducted using the armature.
These motors come in several varieties:

• Compensated motors: Compensated repulsion motors have additional windings (a compensated winding), which boosts the power factor and improves speed regulation. This winding is smaller than stator winding and typically exists in the inner slots of the main poles.
• Repulsion induction: The repulsion induction motor features a single-phase stator winding (much like the repulsion-start induction motor described below) but with two separate windings on the rotor in common slots. There’s an inner winding, which is a squirrel cage winding with rotor bars that are short circuited, and an outer winding, which is a repulsion or commutator winding.
• Repulsion-start induction motor: This type of motor starts as a repulsion motor but then runs as an induction motor. This motor is designed with a centrifugal device that provides about 75 to 80 percent of synchronous speed and short circuits every commutator segment.

What are the uses of a repulsion motor?

There is a wide variety of applications for repulsion motors. They can be used for textile machines, floor maintenance, film winding, farm motors, laundry equipment, air compressors, various pumps and fans, machine tools, mining tools, gas pumps, drive compressors, high-speed lifts, mixing machines, printing presses and much more.
Most commutator motors are restricted to up to 1500 volts, as higher voltages could pose a threat of arcing. In most cases, these motors are used where high voltages are needed because the circuit for the rotor is not directly connected electrically to the power supply.

Interested in learning more about the construction and applications for repulsion motors? We encourage you to contact us today at M.B. McKee Company, Inc. with any questions you have about the equipment and services we provide, and we will be happy to provide you with further information. We look forward to working with you to improve your operations!

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