Temperature estimation of DC motor based on sensing voltage
AssigneeHewlett-Packard Development Company, L.P.
InventorsJi-Young Byun, Hyoungil Kim, Yong-Ho You
Life of this patent
Estimating the term…
Abstract
An image forming apparatus includes a print engine, a DC motor, a driving circuit, and a processor. The print engine forms an image. The DC motor drives the print engine. The driving circuit provides a current to the DC motor, and senses a variation of the current provided to the DC motor. The processor calculates a temperature of the DC motor based on the variation of the current flowing through the DC motor, and controls an operation of the image forming apparatus based on the calculated temperature.
Claims20
An image forming apparatus, comprising:
- a print engine to form an image;
- a DC motor to drive the print engine;
- and
- a driving circuit to provide a current to the DC motor, the driving circuit including a shunt resistance to sense a variation of the current provided to the DC motor, a filtering circuit to perform low pass filtering on a voltage of the shunt resistance, and an amplification circuit to amplify an output value of the filtering circuit and to provide the amplified output value to a processor,
- the processor to calculate a temperature of the DC motor based on the variation of the current flowing through the DC motor, and to control an operation of the image forming apparatus based on the calculated temperature.
An image forming method comprising:
- providing a current to a DC motor;
- sensing a variation of the current provided to the DC motor using a voltage value of a shunt resistance;
- calculating a temperature of the DC motor based on the variation of the current flowing through the DC motor;
- and
- controlling an operation of an image forming apparatus based on the calculated temperature,
- wherein the sensing comprises sensing the variation of the current provided to the DC motor using the voltage value of the shunt resistance to feedback information on a magnitude of a constant current.
An image forming apparatus, comprising:
- a print engine to form an image;
- a DC motor to drive the print engine;
- a driving circuit to provide a current to the DC motor, and to sense a variation of the current provided to the DC motor;
- and
- a processor to:
- calculate a temperature of the DC motor based on the variation of the current flowing through the DC motor,
- control an operation of the image forming apparatus based on the calculated temperature,
- perform a requested print job in a normal mode based on the calculated temperature being within a predetermined first temperature range, and
- perform the requested print job in a stress mode, in which at least one of a number of consecutive prints or a print speed is reduced, based on the calculated temperature being within a second temperature range that is higher than the predetermined first temperature range.
Dependencies are inferred from the claim text.