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Brushless DC pump with enclosed circuit board

  • US 4,998,865 A
  • Filed: 07/10/1989
  • Issued: 03/12/1991
  • Est. Priority Date: 07/11/1988
  • Status: Expired due to Fees
First Claim
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1. A motor-driven pump comprising:

  • a pump housing;

    a brushless motor mounted in said pump housing;

    pump means mounted in said pump housing and adapted to be driven by said brushless motor; and

    a circuit package mounted in a liquid passage defined in said pump housing, said circuit package enclosing a circuit board mounting thereon a control circuit for controlling rotation of said brushless motor and means for detecting a rotor position of said brushless motor, wherein said circuit board is fixed through an elastic member to an inner wall of said circuit package with a gap defined between said circuit board and said inner wall, and said circuit package is opposed to said brushless motor at a position where said circuit board is spaced a distance from said brushless motor in an axial direction of a rotating shaft of said brushless motor.

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