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Brushless DC motors with remote Hall sensing and methods of making the same

  • US 7,095,193 B2
  • Filed: 05/19/2004
  • Issued: 08/22/2006
  • Est. Priority Date: 05/19/2004
  • Status: Active Grant
First Claim
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1. A brushless DC motor apparatus, comprising:

  • a housing;

    a stator assembly coupled to the housing, the stator assembly having a support and windings coupled to the support;

    a magnetic rotor assembly rotatably coupled to the housing, the magnetic rotor assembly being configured to rotate within the housing in response to electric currents through the windings; and

    position sensors which are configured to provide position signals identifying angular position of the magnetic rotor assembly relative to the stator assembly, each position sensor including (i) a Hall-effect sensor disposed distally from the windings, and (ii) magnetic circuit members having first end portions adjacent to the windings and proximate to rotor magnets and second end portions adjacent to the Hall-effect sensor,wherein the windings of the stator assembly are configured to operate at a maximum temperature which is greater than 150 degrees Celsius, and wherein the Hall effect sensors of the position sensors are configured to operate at a maximum temperature which is less than 150 degrees Celsius.

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