DC motor drive circuit
AssigneeNidec Corporation
InventorKenji Oe
Life of this patent
Estimating the term…
Abstract
A DC motor drive circuit includes a position detector for producing an output signal that corresponds to a rotational position of the rotor, a current controller for controlling current supply to the winding in accordance with the output signal of the position detector, and a phase advancing portion for the current between the position detecting portion and the current controller, so that the timing for supplying current to the winding is advanced and efficiency of converting the current supplied to the winding into a motor torque is improved.
Claims9
A DC motor drive circuit for driving a single-phase brushless motor including a stator with a single-phase winding and a rotor having a rotor magnet arranged to be opposed to the stator, the DC motor drive circuit comprising:
- a position detecting portion for producing two output signals having different phases that correspond to a rotational position of the rotor;
- a current controlling portion for controlling current supply to the winding in accordance with the output signal of the position detecting portion;
- and
- a phase advancing portion for receiving two output signals from the position detecting portion and for producing two phase-advanced output signals in which the phases of the output signals are advanced, wherein the two phase-advanced output signals of the phase advancing portion are supplied to the current controlling portion so that the timing for supplying current to the winding is advanced.
A DC motor drive circuit for driving a two-phase brushless motor including a stator with a two-phase winding and a rotor having a rotor magnet arranged to be opposed to the stator, the DC motor drive circuit comprising:
- a position detecting portion for producing two output signals having different phases that correspond to a rotational position of the rotor;
- a current controlling portion for controlling current supply to the winding in accordance with the output signal of the position detecting portion;
- and
- a phase advancing portion for receiving two output signals from the position detecting portion and for producing two phase-advanced output signals in which the phases of the output signals are advanced, wherein the two phase-advanced output signals of the phase advancing portion are supplied to the current controlling portion so that the timing for supplying current to the winding is advanced.
A DC motor drive circuit for driving a single-phase brushless motor including a stator with a single-phase winding and a rotor having a rotor magnet arranged to be opposed to the stator, the DC motor drive circuit comprising:
- a position detecting portion for producing an output signal that corresponds to a rotational position of the rotor;
- a current controlling portion for controlling current supply to the winding in accordance with the output signal of the position detecting portion;
- and
- a phase advancing portion for receiving the output signal from the position detecting portion and for producing a phase-advanced output signal in which the phase of the output signal is advanced, wherein the phase-advanced output signal of the phase advancing portion is supplied to the current controlling portion so that the timing for supplying current to the winding is advanced.
Dependencies are inferred from the claim text.