×

Method and device for controlling a brushless electric motor

  • US 6,380,707 B1
  • Filed: 08/24/2001
  • Issued: 04/30/2002
  • Est. Priority Date: 10/12/1998
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method for controlling a brushless electric motor having switching means for selectively supplying current to armature windings of the motor from a DC-power supply, the method comprising the steps ofmeasuring back-electromotive forces developed during operation in the windings of the motor, generating a low reference voltage and a high reference voltage, comparing said back-electromotive forces with said low and high reference voltages for generating commutation signals each time a measured back-electromotive force with positive slope crosses the high reference voltage, and/or a measured back-electromotive force with negative slope crosses the low reference voltage, and using said commutation signals to commutate the switching means.

View all claims
  • 4 Assignments
Timeline View
Assignment View
    ×
    ×