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US 8,947,031 B1Granted
Systems and method for speed and torque control of a DC motor
AssigneeJohnson Controls Technology Company
InventorsRussell W. Diamond, Gary A. Romanowich, David R. Fuhr
Life of this patent
Estimating the term…
Abstract
A method for operating a direct current (DC) motor is shown and described. The method includes using pulse width modulated (PWM) DC output to control the speed of the DC motor. The method further includes sensing current output to the motor. When the sensed current exceeds a threshold, the method holds the PWM DC output off.
Claims21
A method for operating a direct current (DC) motor, the method comprising:
- generating a first pulse width modulated (PWM) signal having a first duty cycle;
- providing the first PWM signal as a PWM DC output for the DC motor;
- adjusting the first duty cycle to control the speed of the DC motor;
- using updated temperature information to adaptively select a second duty cycle for a second PWM signal;
- generating the second PWM signal having the second duty cycle;
- using the second PWM signal to set a threshold;
- sensing current output to the motor;
- and
- when the sensed current exceeds the threshold, holding the PWM DC output off.
6 more elements
A device for operating a direct current (DC) motor, the device comprising:
- a circuit configured to:
- generate a first pulse width modulated (PWM) signal having a first duty cycle adjustable to control the speed of the DC motor,
- provide the first PWM signal as a PWM DC output for the DC motor,
- use updated temperature information to adaptively select a second duty cycle for a second PWM signal,
- generate the second PWM signal having the second duty cycle, and
- use the second PWM signal to set a threshold;
- and
- a current sensor coupled to the circuit and configured to sense current output to the motor;
- wherein the circuit is configured to compare a value representative of the sensed current to the threshold and to hold the PWM DC output off in response to the comparison.
6 more elements
Dependencies are inferred from the claim text.