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Motor

  • US 6,424,106 B2
  • Filed: 03/29/2001
  • Issued: 07/23/2002
  • Est. Priority Date: 03/31/2000
  • Status: Expired due to Fees
First Claim
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1. A motor comprising:

  • a rotor which has a field part generating field fluxes;

    Q-phase windings (Q is an integer of 3 or more);

    voltage supplying means which includes two output terminals for supplying a DC voltage;

    power supplying means having Q first FET power transistors and Q second FET power transistors for supplying a power to said Q-phase windings, each of said Q first FET power transistors forming a current path between one output terminal side of said voltage supplying means and one of said Q-phase windings, and each of said Q second FET power transistors forming a current path between the other output terminal side of said voltage supplying means and one of said Q-phase windings;

    voltage detecting means for producing a detected pulse signal in response to terminal voltages of said Q-phase windings;

    state shifting means for shift-holding a holding state from one state to at least one other state in sequence in response to the detected pulse signal of said voltage detecting means;

    activation control means for controlling active periods of said Q first FET power transistors and said Q second FET power transistors in response to said holding state;

    commanding means for producing a command signal in response to an output pulse signal of said voltage detecting means; and

    switching operation means for causing at least one of said Q first FET power transistors and said Q second FET power transistors to perform high-frequency switching in response to said command signal;

    and that said activation control means produces Q-phase first activation control signals and Q-phase second activation control signals in response to said holding state of said state shifting means for controlling said active periods of said Q first FET power transistors and said Q second FET power transistors, each of said active periods being an electrical angle which is larger than 360/Q degrees, said switching operation means produces a switching pulse signal in response to said command signal, and makes high-frequency switching operation of at least one FET power transistor among said Q first FET power transistors and said Q second FET power transistors in response to said switching pulse signal, and said state shifting means includes;

    adjusting means for producing a timing signal after an adjust time from detection of said detected pulse signal, shift hold means for shift-holding said holding state in response to said timing signal, and adjust changing means for changing said adjust time of said adjusting means smaller in case that said command signal is larger than a predetermined value, thereby making the product value of said adjust time and said rotational speed of said rotor smaller in said case.

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