Electrical Projects Repulsion-Induction motor. This type of motor uses brushes that contact a commutator to start the motor. The brushes are not connected to a source, but are short-circuited (connected together). Once the motor has started and is running, the centrifugal device forces a short-circuiting ring into contact with the commutator, shorting all of the commutator bars together and causing the machine to run as a simple induction motor. At the same time, the centrifugal device raises the brushes to prevent their wear. This type of motor is used where a high starting torque is desired. A variation of this type of machine is the

brush-shifting repulsion motor, in which the speed is determined by the position of the brushes on the commutator.





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May 19, 2012