As the motor starts up, the commutator short-circuits some of the rotor windings, creating a magnetic field that opposes the field produced by the stator. This repulsion between the two fields causes the rotor to spin in the opposite direction of the stator field. Once the motor reaches its rated speed, the commutator switches to a different set of windings, allowing the motor to operate normally.
Repulsion motors are typically used in applications where a high starting torque is required, such as in cranes, hoists, elevators, and other heavy machinery. They are also used in fans, blowers, and pumps because they can provide a wide range of speed control.
One variation of the repulsion motor is the magnetic repulsion motor, which uses permanent magnets instead of windings on the rotor. This design eliminates the need for brushes and commutators, making it more efficient and reliable. The magnetic repulsion motor also provides a smoother, more constant torque, making it ideal for applications that require precise control.
In addition to their high starting torque and speed control capabilities, repulsion motors have a number of other advantages. They are simple and rugged, making them easy to maintain and repair. They are also relatively inexpensive compared to other types of motors, and they can operate in harsh environments and at high altitudes.
Overall, the repulsion motor is a versatile and reliable option for a wide range of applications. Whether you need high starting torque, precise speed control, or a simple and rugged motor design, the repulsion motor is a great choice. And for even greater efficiency and reliability, consider the magnetic repulsion motor.