MOTOR CONTROL APPARATUS, SHEET CONVEYANCE APPARATUS, DOCUMENT FEEDING APPARATUS, DOCUMENT READING APPARATUS, AND IMAGE FORMING APPARATUS
First Claim
1. A motor control apparatus to control a motor based on an instructed phase indicating a target phase of a rotor of the motor, the motor control apparatus comprising:
- a detector configured to detect a driving current flowing through a winding of the motor;
a phase determiner configured to determine a rotation phase of the rotor based on the driving current detected by the detector;
a converter configured to convert a current value in a stationary coordinate system which is detected by the detector into a current value in a rotational coordinate system based on the rotation phase determined by the phase determiner; and
a controller including a first control mode for controlling the driving current in a manner that a magnitude of the driving current detected by the detector becomes a target value set in a manner that a phase deviation between the instructed phase and the rotation phase determined by the phase determiner is decreased, and a second control mode for controlling the driving current based on a current having a previously determined magnitude,wherein, in a case where the control mode for controlling the driving current is switched from the second control mode to the first control mode, the target value in the first control mode is set based on a value of a torque current component of the driving current detected by the detector during execution of the second control mode, andwherein the torque current component corresponds to a current component represented by the rotational coordinate system of the driving current converted by the converter.
1 Assignment
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Accused Products
Abstract
An apparatus, to control a motor from an instructed phase indicating a motor rotor target phase, includes a detector, a phase determiner, a converter, and a controller. The detector detects a motor winding driving current. The phase determiner determines a rotor rotation phase from the detected driving current. The converter converts a detected current value in a stationary coordinate system into a current value in a rotational coordinate system from the determined rotation phase. The controller includes a first mode for controlling the driving current to cause a determined phase deviation between the instructed and rotation phases to decreased, and a second mode for controlling the driving current from a current having a previously determined magnitude. On switching the mode from the second to the first mode, the first mode target value is set from a driving current value corresponding to a current component represented by the rotational coordinate system.
4 Citations
24 Claims
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1. A motor control apparatus to control a motor based on an instructed phase indicating a target phase of a rotor of the motor, the motor control apparatus comprising:
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a detector configured to detect a driving current flowing through a winding of the motor; a phase determiner configured to determine a rotation phase of the rotor based on the driving current detected by the detector; a converter configured to convert a current value in a stationary coordinate system which is detected by the detector into a current value in a rotational coordinate system based on the rotation phase determined by the phase determiner; and a controller including a first control mode for controlling the driving current in a manner that a magnitude of the driving current detected by the detector becomes a target value set in a manner that a phase deviation between the instructed phase and the rotation phase determined by the phase determiner is decreased, and a second control mode for controlling the driving current based on a current having a previously determined magnitude, wherein, in a case where the control mode for controlling the driving current is switched from the second control mode to the first control mode, the target value in the first control mode is set based on a value of a torque current component of the driving current detected by the detector during execution of the second control mode, and wherein the torque current component corresponds to a current component represented by the rotational coordinate system of the driving current converted by the converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A motor control apparatus to control a motor based on an instructed speed indicating a target speed of a rotor of the motor, the motor control apparatus comprising:
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a detector configured to detect a driving current flowing through a winding of the motor; a phase determiner configured to determine a rotation phase of the rotor based on the driving current detected by the detector; a speed determiner configured to determine a rotation speed of the rotor; a converter configured to convert a current value in a stationary coordinate system which is detected by the detector into a current value in a rotational coordinate system based on the rotation phase determined by the phase determiner; and a controller including a first control mode for controlling the driving current in a manner that a magnitude of the driving current detected by the detector becomes a target value set in a manner that a phase deviation between an instructed phase indicating a target phase of a rotor of the motor and the rotation phase determined by the phase determiner is decreased, and a second control mode for controlling the driving current based on a current having a previously determined magnitude, wherein, in a case where the control mode for controlling the driving current is switched from the second control mode to the first control mode, the target value in the first control mode is set based on a value of a torque current component of the driving current detected by the detector during execution of the second control mode, and wherein the torque current component corresponds to a current component represented by the rotational coordinate system of the driving current converted by the converter.
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20. A sheet conveyance apparatus to convey a sheet, the sheet conveyance apparatus comprising:
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a conveyance roller configured to convey the sheet; a motor configured to drive the conveyance roller; a detector configured to detect a driving current flowing through a winding of the motor; a phase determiner configured to determine a rotation phase of a rotor of the motor based on the driving current detected by the detector; a converter configured to convert a current value in a stationary coordinate system which is detected by the detector into a current value in a rotational coordinate system based on the rotation phase determined by the phase determiner; and a controller including a first control mode for controlling the driving current in a manner that a magnitude of the driving current detected by the detector becomes a target value set in a manner that a phase deviation between the instructed phase and the rotation phase determined by the phase determiner is decreased, and a second control mode for controlling the driving current based on a current having a previously determined magnitude, wherein, in a case where the control mode for controlling the driving current is switched from the second control mode to the first control mode, the target value in the first control mode is set based on a value of a torque current component of the driving current detected by the detector during execution of the second control mode, and wherein the torque current component corresponds to a current component represented by the rotational coordinate system of the driving current converted by the converter.
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21. A document feeding apparatus to feed a document, the document feeding apparatus comprising:
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a document tray onto which a document is stacked; a conveyance roller configured to convey the document stacked onto the document tray; a motor configured to drive the conveyance roller; a detector configured to detect a driving current flowing through a winding of the motor; a phase determiner configured to determine a rotation phase of a rotor of the motor based on the driving current detected by the detector; a converter configured to convert a current value in a stationary coordinate system which is detected by the detector into a current value in a rotational coordinate system based on the rotation phase determined by the phase determiner; and a controller including a first control mode for controlling the driving current in a manner that a magnitude of the driving current detected by the detector becomes a target value set in a manner that a phase deviation between the instructed phase and the rotation phase determined by the phase determiner is decreased, and a second control mode for controlling the driving current based on a current having a previously determined magnitude, wherein, in a case where the control mode for controlling the driving current is switched from the second control mode to the first control mode, the target value in the first control mode is set based on a value of a torque current component of the driving current detected by the detector during execution of the second control mode, and wherein the torque current component corresponds to a current component represented by the rotational coordinate system of the driving current converted by the converter.
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22. A document reading apparatus to read an image of a document, the document reading apparatus comprising:
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a document tray onto which a document is stacked; a conveyance roller configured to convey the document stacked onto the document tray; a reading unit configured to read the document conveyed by the conveyance roller; a motor configured to drive the conveyance roller; a detector configured to detect a driving current flowing through a winding of the motor; a phase determiner configured to determine a rotation phase of a rotor of the motor based on the driving current detected by the detector; a converter configured to convert a current value in a stationary coordinate system which is detected by the detector into a current value in a rotational coordinate system based on the rotation phase determined by the phase determiner; and a controller including a first control mode for controlling the driving current in a manner that a magnitude of the driving current detected by the detector becomes a target value set in a manner that a phase deviation between the instructed phase and the rotation phase determined by the phase determiner is decreased, and a second control mode for controlling the driving current based on a current having a previously determined magnitude, wherein, in a case where the control mode for controlling the driving current is switched from the second control mode to the first control mode, the target value in the first control mode is set based on a value of a torque current component of the driving current detected by the detector during execution of the second control mode, and wherein the torque current component corresponds to a current component represented by the rotational coordinate system of the driving current converted by the converter.
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23. An image forming apparatus to form an image on a recording medium, the image forming apparatus comprising:
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an image forming unit configured to form the image on the recording medium; a motor configured to drive load; a detector configured to detect a driving current flowing through a winding of the motor; a phase determiner configured to determine a rotation phase of a rotor of the motor based on the driving current detected by the detector; a converter configured to convert a current value in a stationary coordinate system which is detected by the detector into a current value in a rotational coordinate system based on the rotation phase determined by the phase determiner; and a controller including a first control mode for controlling the driving current in a manner that a magnitude of the driving current detected by the detector becomes a target value set in a manner that a phase deviation between the instructed phase and the rotation phase determined by the phase determiner is decreased, and a second control mode for controlling the driving current based on a current having a previously determined magnitude, wherein, in a case where the control mode for controlling the driving current is switched from the second control mode to the first control mode, the target value in the first control mode is set based on a value of a torque current component of the driving current detected by the detector during execution of the second control mode, and wherein the torque current component corresponds to a current component represented by the rotational coordinate system of the driving current converted by the converter. - View Dependent Claims (24)
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Specification