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US 7,622,876 B2Granted
Overload prevention device for permanent magnet DC motors
AssigneeDanaher Motion
InventorsLarry Plunkett, Greg Kolacinski
Life of this patent
Estimating the term…
Abstract
A method, apparatus or computer program implements an overload prevention approach involving monitoring a speed of a motor; detecting an overload condition of the motor based on the monitored speed; and controlling an operation of the motor according to the detected overload condition.
Claims23
A method comprising:
- monitoring a speed of a motor;
- detecting a load condition of the motor based on the monitored speed to determine the detecting comprising comparing the monitored speed to a first speed threshold and depending on the comparison calculating an average speed over time or over a number of speed measurements and determining whether the load condition exists or not based on a comparison of the calculated average speed to an average speed threshold;
- and
- controlling an operation of the motor according to the detected load condition.
1 more element
An apparatus comprising:
- a sensor for monitoring a speed of a motor;
- a detector module for detecting a load condition of the motor based on the monitored speed to determine a stroke state of the motor, the detector module comparing the monitored speed to a first speed threshold and depending on the comparison calculating an average speed over time or over a number of speed measurements and determining whether the load condition exists or not based on a comparison of the calculated average speed to an average speed threshold;
- a control module for controlling an operation of the motor according to the detected load condition.
A tangible computer medium having computer executable code which when executed by a processor performs the following method:
- monitoring a speed of a motor;
- detecting a load condition of the motor based on the monitored speed to determine a stroke state of the motor, the detecting comprising comparing the monitored speed to a first speed threshold and depending on the comparison calculating an average speed over time or over a number of speed measurements and determining whether the load condition exists or not based on a comparison of the calculated average speed to an average speed to an average speed threshold;
- and
- controlling an operation of the motor according to the detected load condition.
1 more element
Dependencies are inferred from the claim text.