Motor control apparatus
First Claim
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1. A motor control apparatus comprising:
- an encoder for producing a pulse signal in synchronism with rotation of a rotor of a motor that rotates a control object;
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 pulse signal of the encoder and sequentially switching a current supply phase of the motor; and
abnormality monitoring means for monitoring presence/absence of an abnormality in a state of a feedback control on the motor, wherein the control means switches from the feedback control to an open-loop control and rotates the rotor by sequentially switching the current supply phase of the motor without feeding back information of the count of the pulse signal of the encoder, when the abnormality monitoring means detects an abnormality in the state of the feedback control.
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Abstract
Presence/absence of a failure in a feedback control system of a motor is monitored. When a failure is detected in the feedback control system, the motor is driven by switching to an open-loop control. During the open-loop control, the motor is rotated by sequentially switching the motor current supply phase without feeding back encoder count information. The position count is incremented or decremented every time the current supply phase is switched. When the position count has reached a target count, it is determined that the rotor has reached a target position, whereupon the open-loop control is finished.
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Citations
29 Claims
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1. A motor control apparatus comprising:
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an encoder for producing a pulse signal in synchronism with rotation of a rotor of a motor that rotates a control object;
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 pulse signal of the encoder and sequentially switching a current supply phase of the motor; and
abnormality monitoring means for monitoring presence/absence of an abnormality in a state of a feedback control on the motor, wherein the control means switches from the feedback control to an open-loop control and rotates the rotor by sequentially switching the current supply phase of the motor without feeding back information of the count of the pulse signal of the encoder, when the abnormality monitoring means detects an abnormality in the state of the feedback control. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A motor control apparatus comprising:
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an encoder for producing a pulse signal in synchronism with rotation of a rotor of a motor that rotates a control object;
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 pulse signal of the encoder and sequentially switching a current supply phase of the motor;
failure monitoring means for monitoring presence/absence of a failure in a feedback control system of the motor; and
fail-safe means for switching from the feedback control to an open-loop control when the failure monitoring means has detected a failure in the feedback control system, sequentially switching the current supply phase of the motor without feeding back information of the count of the pulse signal of the encoder, counting the number of times of switching of the current supply phase, and rotating the rotor to the target position on the basis of a resulting count. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A motor control apparatus comprising:
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an encoder for producing a pulse signal in synchronism with rotation of a rotor of a motor that rotates a control object;
feedback control means for performing a feedback control for rotating the rotor to a target position by detecting a rotation position of the rotor on the basis of a count of the pulse signal of the encoder and sequentially switching a current supply phase of the motor;
open-loop control means for switching from the feedback control to an open-loop control if a feedback control execution condition is not satisfied, sequentially switching the current supply phase by supplying a drive signal to a drive circuit of the motor without feeding back information of the count of the pulse signal of the encoder, counting pulses of the drive signal, and rotating the rotor to the target position on the basis of a resulting count; and
abnormality diagnosis means for determining presence/absence of an abnormality in the encoder by comparing a count of the pulse signal of the encoder and the count of the drive signal that are obtained during the open-loop control. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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29-39. -39. (canceled)
Specification