Speed reduction switch

Details Speed reduction switch Speed reduction switch

1999-06-10

2000-09-19

Ip, Paul

Electricity: motive power systems

Induction motor systems

Primary circuit control

318773, 318775, 318776, 318524, H02P 528

Patent

active

061217468

ABSTRACT:
A speed reduction switch for a multiple speed induction motor includes a speed selector switch and a delay element. As the motor is switched from a high speed to a lower speed, the delay element temporarily prevents electrical connection of a motor auxiliary winding for low speed operation. The motor is therefore de-energized and slows down. After a preselected delay, the delay element connects the motor auxiliary winding when the motor is at a lower speed so that little magnetic braking of the motor occurs, and the motor smoothly transitions from a higher speed to a lower speed.

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