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CONSTANT-POWER BRUSHLESS DC MOTOR AND THE GENERATOR THEREBY

  • US 20100052451A1
  • Filed: 12/14/2006
  • Published: 03/04/2010
  • Est. Priority Date: 12/14/2005
  • Status: Active Grant
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1. A generator using a constant-power brushless DC motor, comprising:

  • the motor comprising;

    a stator independently wound in parallel by phases and poles and configured of n phases, wherein each winding coil is connected to each of n full H-bridges, without interconnection, and the n full H-bridges are connected to a direct current power source in parallel;

    a rotor including a shaft positioned in the center of the rotor, wherein the rotor is constituted to allow magnetic flux to be concentrated in an exciting area;

    a commutation encoder including a sensing region and a non-sensing region, wherein the commutation encoder is externally positioned to one end of the shaft; and

    photo sensors, wherein two photo sensors are positioned at each phase and connected to a half H-bridge of each phase, for turning on/off each half H-bridge, wherein,the rotor is constituted by stacking plates with a number of vacant spaces, wherein a number of bar type permanent magnets are positioned through the stacked plates;

    the commutation encoder is constituted by forming an interval of the sensing regions to allow a photo sensors to sense so that a (i.e., 1<

    a≦

    n−

    1) phases, among n phases, are excited according to the interval of the sensing regions, in which a shaft angle of the sensing region is determined by Formula 1, the number of the sensing regions in the commutation encoder is determined by half (½

    ) the number of poles of the rotor, and a position interval of each photo sensor on a sensor plate is determined by Formula 2 so that the a phases, among the n phases, are always excited and b (i.e., b=n−

    a) phases are always inexcited; and

    the stator further comprises interference prevention slots between winding holes by which the windings are wound, in which induction winding and power generation winding are alternately wound through the winding holes at a winding interval controlled at various rates, a power leading line is arranged to the power generation winding of the windings wound around the stator, and induced current of the stator generated by the rotation of the rotor by power supply of the induction winding is induced to the power leading line arranged to the power generation winding. Angle



    of



    sensing



    region



    ( °

     )     = 360

    °

     ×

     number



    of



    phases



    to



    be



    excited     number



    of



    poles



    of



    rotor ×

         number



    of



    phases



    of



    motor     Formula



    1     Position



    interval



    of



    each



    photo



    sensor



    ( °

     )     = 360

    °

         number



    of



    poles ×

     number



    of



    phases     Formula



    2

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