Motor driving apparatus
AssigneeCanon Kabushiki Kaisha
InventorNobuyuki Furukawa
Life of this patent
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Abstract
A motor driving apparatus comprises a motor including a rotor that is rotatable and has a magnet whose outer peripheral surface divided in a circumferential direction is magnetized in multiple poles with alternating different polarities, and a position detecting unit having a first detecting element, a second detecting element, a third detecting element and a fourth detecting element, each of which detects a magnet pole, a driving unit that drives the motor on the basis of signals output from the first to fourth detecting elements, and a controlling unit that obtains a rotational quantity of the motor on the basis of signals output from the first and second detecting elements and that outputs a control signal of the motor to the driving unit on the basis of the rotational quantity of the motor.
Claims16
A motor driving apparatus for driving a motor including a rotor that is rotatable and that has a magnet whose outer peripheral surface divided in a circumferential direction is magnetized in multiple poles with alternating different polarities, the motor driving apparatus comprising:
- a selecting unit configured to select several detecting elements from a first detecting element, a second detecting element, a third detecting element, and a fourth detecting element, each of which detects a magnet pole of the magnet;
- a driving unit configured to obtain a driving signal using signals output from the selected detecting elements and drive the motor based on the driving signal;
- and
- a controlling unit configured to obtain a rotational quantity of the motor using signals output from the first and second detecting elements, obtain a control signal from the rotational quantity of the motor, and output the control signal to the selecting unit,
- wherein the controlling unit does not use signals output from the third and fourth detecting elements to obtain the rotational quantity even if the selecting unit selects the third and fourth elements.
A method for driving a motor including a rotor that is rotatable and that has a magnet whose outer peripheral surface divided in a circumferential direction is magnetized in multiple poles with alternating different polarities, the method comprising:
- a selecting step for selecting several detecting elements from a first detecting element, a second detecting element, a third detecting element, and a fourth detecting element, each of which detects a magnet pole of the magnet
- a driving step for obtaining a driving signal using signals output from the selected detecting elements and driving the motor based on the driving signal;
- an obtaining step for obtaining a rotational quantity of the motor using signals output from the first and second detecting elements and obtaining a control signal from the rotational quantity of the motor, and
- an outputting step for outputting the control signal to a selecting unit of the motor,
- wherein the obtaining step does not use signals output from the third and fourth detecting elements to obtain the rotational quantity even if the selecting step selects the third and fourth elements.
A non-transitory computer-readable medium configured to store a method for driving a motor including a rotor that is rotatable and that has a magnet whose outer peripheral surface divided in a circumferential direction is magnetized in multiple poles with alternating different polarities, the method comprising:
- a selecting step for selecting several detecting elements from a first detecting element, a second detecting element, a third detecting element, and a fourth detecting element, each of which detects a magnet pole of the magnet;
- a driving step for obtaining a driving signal using signals output from the selected detecting elements and driving the motor based on the driving signal;
- an obtaining step for obtaining a rotational quantity of the motor using signals output from the first and second detecting elements and obtaining a control signal from the rotational quantity of the motor;
- and
- an outputting step for outputting the control signal to a selecting unit of the motor,
- wherein the obtaining step does not use signals output from the third and fourth detecting elements to obtain the rotational quantity even if the selecting step selects the third and fourth elements.
Dependencies are inferred from the claim text.