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Brushless motor control method

  • US 6,838,848 B2
  • Filed: 05/29/2003
  • Issued: 01/04/2005
  • Est. Priority Date: 06/07/2002
  • Status: Expired due to Fees
First Claim
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1. A method of controlling a brushless motor comprising a stator having a multiphase armature coil, a rotor having a permanent magnet and arranged rotatably at the outside or inside of said stator, a first sensor group of a plurality of magnetic detection elements and a second sensor group having at least a magnetic detection element separated from said magnetic detection elements of said first sensor group by a predetermined gap, the method comprising:

  • forming a plurality of energization stages corresponding to respective rotary positions of said rotor by means of said first sensor group and said second sensor group and defining a torque constant for each of said energization stages; and

    computationally determining a target electric current value for each of said energization stages on the basis of said torque constant and the target torque of each stage and supplying power to said armature coil on the basis of said target electric current value.

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