×

Control circuit for two speed motors

  • US 5,892,349 A
  • Filed: 10/29/1996
  • Issued: 04/06/1999
  • Est. Priority Date: 10/29/1996
  • Status: Expired due to Fees
First Claim
Patent Images

1. A control circuit for an electric motor having a single start winding, a low speed run winding and a high speed run winding, a selector switch for selectively activating either said low speed run winding or said high speed run winding, said motor being operable in a low speed range on said low speed run winding and in a high speed range on said high speed run winding, a sensed value generator that provides a sensed value that is correlated to motor speed, a start winding control that automatically responds to said sensed value to automatically reactivate the start winding at one reactivating speed when the motor speed decreases below said high speed range down to said one reactivating speed while running with said high speed run winding active in said high speed range above said one reactivating speed, said start winding control automatically responding to said sensed value to automatically reactivate the start winding at another reactivating speed when the motor speed decreases below said low speed range down to said another reactivating speed while running with said low speed run winding active in said low speed range above said another reactivating speed, said another reactivating speed being substantially lower than said one reactivating speed, and said start winding control automatically responding to said sensed value to automatically deactivate said start winding at a predetermined motor speed that is greater than said high reactivating speed.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×