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US 8,618,754 B2Granted
Motor control apparatus and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorYoritsugu Maeda
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AssigneeCanon Kabushiki Kaisha
InventorYoritsugu Maeda
Estimating the term…
A motor control apparatus that controls a DC motor includes a detection unit configured to detect angular speed of the DC motor, a driven member configured to be driven by the DC motor, and a control unit configured to increase, when starting to drive the DC motor, a control value for controlling driving of the DC motor from a first control value to a second control value at a predetermined increase rate, wherein the control unit detects a start-up characteristic of the DC motor based on a detection result of the detection unit, and corrects the first control value or the increase rate according to a result of comparing a detected start-up characteristic and a predetermined start-up characteristic such that the start-up characteristic of the DC motor becomes closer to the predetermined start-up characteristic.
A motor control apparatus that controls a direct current (DC) motor, the apparatus comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
For starting dynamo-electric motors or dynamo-electric converters: for starting an individual DC motor
Controlling armature supply only: whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value
Control or regulation of electric motors, electric generators or dynamo-electric converters
About 5 years 2 months of term left · ends 5 Jan 2032 (estimated)
1. Field of the Invention
The present invention generally relates to motor control and image forming and, more particularly, to a motor control apparatus that controls a direct current (DC) motor, and an image forming apparatus that includes the motor control apparatus.
2. Description of the Related Art
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the invention and, together with the description, serve to explain the principles of the invention.
FIG. 1 illustrates a cross-sectional view of a color copying machine according to an exemplary embodiment of the present invention.
FIG. 2 illustrates a configuration for driving a photosensitive drum 11 according to an exemplary embodiment of the present invention.
Various exemplary embodiments, features, and aspects of the invention will be described in detail below with reference to the drawings.
FIG. 1 is a cross-sectional view illustrating an image forming apparatus in the form of a color copying machine example according to an exemplary embodiment of the present invention. The color copying machine includes a plurality of image forming units disposed in parallel and employs an intermediate transfer system. The color copying machine includes an image reading unit 1R and an image output unit 1P. While a color copying machine is shown as an example of the exemplary embodiment of an image forming apparatus according to the present invention, the present invention is not restricted to a color copying machine only, and may be provided in a variety of other configurations including but not limited to a copying machine, a printer, a color or monochrome multi-function device, and/or the like.
The image reading unit 1R optically reads an original image, converts the read image into electrical signals, and transmits the signals to the image output unit 1P. The image output unit 1P includes a plurality of image forming units 10 (10a, 10b, 10c and 10d) disposed in parallel, a sheet feeding unit 20, an intermediate transfer unit 30, a fixing unit 40, and a cleaning unit 50.