Image forming apparatus
First Claim
1. An image forming apparatus that forms an image on a sheet, the apparatus comprising:
- a rotating body that forms the image;
a motor that rotationally drives the rotating body;
a current measurer that measures a motor current flowing through a current supply path including a winding of the motor at a measurement timing that is a timing after the motor is started;
a torque acquisitor that acquires a torque value of the motor, based on a measured value of the motor current;
a corrector that performs correction to cancel a current change amount based on a characteristic change depending on a temperature state of the motor at the measurement timing, in acquisition of the torque value by the torque acquisitor; and
a motor controller that performs vector control to rotate the motor at a target speed,wherein the corrector obtains the current change amount based on a difference between a measured value or an estimated value of a rotational speed of the motor at the measurement timing, and the target speed, and performs correction using the current change amount.
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Accused Products
Abstract
An image forming apparatus that forms an image on a sheet includes: a rotating body that forms the image; a motor that rotationally drives the rotating body; a current measurer that measures a motor current flowing through a current supply path including a winding of the motor at a measurement timing that is a timing after the motor is started; a torque acquisitor that acquires a torque value of the motor, based on a measured value of the motor current; and a corrector that performs correction to cancel a current change amount based on a characteristic change depending on a temperature state of the motor at the measurement timing, in acquisition of the torque value by the torque acquisitor.
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Citations
10 Claims
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1. An image forming apparatus that forms an image on a sheet, the apparatus comprising:
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a rotating body that forms the image; a motor that rotationally drives the rotating body; a current measurer that measures a motor current flowing through a current supply path including a winding of the motor at a measurement timing that is a timing after the motor is started; a torque acquisitor that acquires a torque value of the motor, based on a measured value of the motor current; a corrector that performs correction to cancel a current change amount based on a characteristic change depending on a temperature state of the motor at the measurement timing, in acquisition of the torque value by the torque acquisitor; and a motor controller that performs vector control to rotate the motor at a target speed, wherein the corrector obtains the current change amount based on a difference between a measured value or an estimated value of a rotational speed of the motor at the measurement timing, and the target speed, and performs correction using the current change amount. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An image forming apparatus comprising:
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a rotating body that forms the image; a motor that rotationally drives the rotating body; a current measurer that measures a motor current flowing through a current supply path including a winding of the motor at a measurement timing that is a timing after the motor is started; a torque acquisitor that acquires a torque value of the motor, based on a measured value of the motor current; a corrector that performs correction to cancel a current change amount based on a characteristic change depending on a temperature state of the motor at the measurement timing, in acquisition of the torque value by the torque acquisitor; and a motor controller that performs vector control to bring a rotational position of the motor to a target position, wherein the corrector obtains the current change amount based on a difference between a measured value or an estimated value of the rotational position of the motor at the measurement timing, and the target position, and performs correction using the current change amount.
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Specification