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Brushless d-c motor system

  • US 4,374,347 A
  • Filed: 03/06/1981
  • Issued: 02/15/1983
  • Est. Priority Date: 03/19/1980
  • Status: Expired due to Fees
First Claim
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1. Two-pulse, two-filament brushless d-c motor system havinga stator (15);

  • d-c current supply means having two terminals (33,35);

    a permanent magnet rotor (11);

    rotor position sensing means (25) providing an output signal positioned on the stator and sensing a predetermined orientation of a magnet pole of the rotor with respect to the stator;

    armature winding means including two winding strands or filaments (20, 21;

    20'"'"', 21'"'"') wound on the stator, said winding strands or filaments being inductively coupled;

    and control circuit means (42) including controlled semiconductor switch means (57, 58;

    69, 75;

    80,

         81) connected to said winding strands or filaments to control pulsed current flow, alternately, through the respective winding strands or filaments,wherein,said semiconductor switch means are of respectively opposite, complementary conduction characteristics (pnp;

    57, 69, 80;

    npn;

    58, 75,

         81);

    one terminal (a2) of one winding strand or filament (21, 21'"'"') being connected through the main current carrying path of one of said semiconductor switch means (npn;

    58, 75,

         81) with one terminal (35) of the current supply means;

    a similarly acting terminal (a1) of the other winding strand or filament (20, 20'"'"') being connected through the main current carrying path of the other, complementary semiconductor switch means (pnp;

    57, 69,

         80) to the other terminal (33) of the current supply means;

    the other terminal (e1) of said one winding strand or filament (21, 21'"'"') being connected with the other terminal (35) of the current supply means;

    the other terminal (e2) of said other winding strand or filament (20, 20'"'"') being connected with said one terminal (33) of the current supply means;

    said one inding strand or filament (21, 21'"'"') and said other winding strand or filament (20, 20'"'"') being tightly a-c coupled together at least at the terminal end portions thereof connected to the respective controlled semiconductor switch means;

    wherein, further, said control circuit means includes output connection means (50) and coupling circuit means (53;

    65, 68, 74;

    82, 87,

         89) connecting output signals from the rotor position sensor means to the control terminal of said complementary controlled semiconductor switch means for alternatingly controlling conduction of the respective switch means to cause pulsed current flow through the respective winding strand or filament from said current supply means,and wherein unilateral conduction means (59, 60;

    80, 81") are provided, respectively connected across the controlled semiconductor switch mens (57, 59, 80;

    58, 75,

         81) and polarized reversely with respect to said semiconductor switch means to recapture inductive energy stored in the respective winding strands or filaments upon turn-off of current flow therethrough during commutation by the pulsed current flow as controlled by said controlled semiconductor switch means.

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