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Electrical power-assisted steering systems

  • US 6,194,849 B1
  • Filed: 05/13/1998
  • Issued: 02/27/2001
  • Est. Priority Date: 09/13/1996
  • Status: Expired due to Fees
First Claim
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1. An electrical power-assisted steering system for a vehicle comprising an electric motor connected through a gearbox to act on a steering mechanism of the vehicle, in which the electric motor is a brushless motor having a plurality of phase windings connected at a star point, and wherein a switching means is provided in at least one phase of the motor, the switching means being movable between a closed position in which current is able to flow in the phase winding, and an open position which prevents current flowing in the respective phase winding of the motor and wherein the switching means is provided at the star point of the motor and opening of the switching means isolate the phase winding from the star point.

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