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Apparatus and method of regulating the speed of a brushless DC motor

  • US 6,650,072 B2
  • Filed: 08/31/2001
  • Issued: 11/18/2003
  • Est. Priority Date: 08/07/1998
  • Status: Expired due to Fees
First Claim
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1. A method of regulating the rotational speed of a DC brushless motor having at least one input terminal, a plurality of motor windings electrically coupled to the at least one input terminal, and a rotor defining a rotor mass and electromagnetically coupled to the motor windings and rotatable by interaction with an electromagnetic field generated by current flowing through the motor windings, the method comprising the following steps:

  • passing motor supply signals from an electrical power source through an electrical conduction switch having an input, an output, and a control terminal;

    pulse width modulating the motor supply signals passing through the electrical conduction switch and generating pulse width modulated motor supply signals;

    transmitting the pulse width modulated motor supply signals through a substantially inductorless path extending from the output of the electrical conduction switch to the at least one input terminal;

    using the windings of the motor to integrate the pulse width modulated motor supply signals and function as an inductor filter to smooth the current level of the motor supply signals; and

    using the rotor mass as a filter capacitor to smooth the voltage level of the motor supply signals.

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