×

Motor driving device and motor driving method

  • US 7,298,106 B2
  • Filed: 07/21/2006
  • Issued: 11/20/2007
  • Est. Priority Date: 07/21/2005
  • Status: Expired due to Fees
First Claim
Patent Images

1. A rotor position sensorless multiphase motor driving device comprising:

  • a rotor;

    a plurality of phase windings;

    a common terminal to which one terminal of terminals at both ends of each winding is star connected;

    an upper-side drive transistor and a lower-side drive transistor connected to the other terminal of the winding;

    a commutation control unit operable to select two terminals from the terminals other than the common terminal of the windings, and to turn on the corresponding pair of upper-side drive transistor and the lower-side drive transistor;

    a rotor position search pulse applying unit operable to apply a search pulse between the selected two terminals; and

    a comparing unit operable to detect a rotor position based on a response signal generated between the unselected terminal other than the common terminal and the common terminal according to the search pulse application.

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