Motor control apparatus
First Claim
1. A motor control apparatus comprising:
- an encoder for producing a pulse output signal in synchronism with rotation of a rotor of a motor;
control means for rotating the rotor to a target position by detecting a rotation position of the rotor on the basis of a count of the output signal of the encoder and sequentially switching a current supply phase of the motor;
reversing monitoring means for monitoring a variation direction of the count of the output signal of the encoder, and determining whether a rotation direction of the rotor has been reversed from a rotation direction toward the target position; and
reversed rotation preventing means for prohibiting current supply for A-phase with which the rotor is driven in a reversed direction when the reversing monitoring means has detected reversing.
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Accused Products
Abstract
In an automatic transmission position control by a motor, it is determined whether the present instant belongs to a starting period, that is, the present instant is immediately after resetting of a control unit or application of power to it. If it is the starting period, an actual shift position that is detected from an output of an output shaft sensor for detecting a rotation position of a motor is set as an instructed shift position. With this measure, even if the control unit is reset for a certain reason while the vehicle is running, the instructed shift position is not changed in association with the resetting. This prevents trouble that the shift position is switched contrary to the intention of the driver, whereby the reliability of a position switching control can be increased.
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Citations
19 Claims
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1. A motor control apparatus comprising:
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an encoder for producing a pulse output signal in synchronism with rotation of a rotor of a motor; control means for rotating the rotor to a target position by detecting a rotation position of the rotor on the basis of a count of the output signal of the encoder and sequentially switching a current supply phase of the motor; reversing monitoring means for monitoring a variation direction of the count of the output signal of the encoder, and determining whether a rotation direction of the rotor has been reversed from a rotation direction toward the target position; and reversed rotation preventing means for prohibiting current supply for A-phase with which the rotor is driven in a reversed direction when the reversing monitoring means has detected reversing. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A motor control apparatus comprising:
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an encoder for producing a pulse output signal in synchronism with rotation of a rotor of a motor; and control means for rotating the rotor to a target position by detecting a rotation position of the rotor on the basis of a count of the output signal of the encoder and sequentially switching a current supply phase of the motor, wherein the control means corrects A-phase lead of the current supply phase with respect to a rotation phase of the rotor in accordance with a rotation speed of the rotor. - View Dependent Claims (8, 12, 13)
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9. A motor control apparatus comprising:
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an encoder for producing a pulse output signal in synchronism with rotation of a rotor of a motor; and control means for rotating the rotor to a target position by detecting a rotation position of the rotor on the basis of a count of the output signal of the encoder and sequentially switching a current supply phase of the motor, wherein the control means controls a rotation speed of the rotor by correcting A-phase lead of the current supply phase with respect to a rotation phase of the rotor and/or switching a current supply method.
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10. A motor control apparatus comprising:
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control means for rotating a rotor to a target position by sequentially switching a current supply phase of a motor, wherein the control means executes a process of temporarily stopping and keeping the rotor at a drive end position by two-phase current supply at an end of driving.
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11. A motor control apparatus comprising:
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control means for rotating a rotor to a target position by sequentially switching a current supply phase of a motor, wherein when the target position has been changed during driving and reversing a rotation direction of the rotor has become necessary, the control means executes a process of temporarily stopping and keeping the rotor at a reversing position by two-phase current supply.
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14. A motor control apparatus comprising:
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an encoder for producing a pulse output signal in synchronism with rotation of a rotor of a motor that rotates a control object; pulse counting means for counting pulses of the output signal of the encoder; control means for detecting a rotation position of the rotor on the basis of a count of the pulse counting means during a drive control on the motor and sequentially switching a current supply phase of the motor so as to rotate the rotor to a target position; first current supply phase setting means for setting a current supply phase on the basis of the count of the pulse counting means in synchronism with output of a pulse of the output signal of the encoder during the drive control on the motor; and second current supply phase setting means for setting a current supply phase on the basis of the count of the pulse counting means in a prescribed cycle until the rotor reaches the target position, wherein every time the first or second current supply phase setting means sets a current supply phase, the control means energizes a winding of the current supply phase thus set. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification