DC motor stall-detection system

Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems

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Details

318434, 388903, 3889075, G05B 1900, H02H 7085

Patent

active

053672364

ABSTRACT:
A motor controller is programmed for detecting motor-stall condition of a dc motor under the control of a motor control system. The motor control system includes a programmable microcontroller in connection with the motor controller and a motor driver. The motor driver communicates with a dc motor. The dc motor is coupled to a position encoder which encoder is in communication with the microcontroller. The method comprises the steps of providing an average stall threshold value ASV and providing the motor controller with a time counter for counting each time interval T to a maximum count N. The motor controller is programmed to issue a motor command representing the position error between the desired motor position and the actual motor position for some time interval T. During each time interval T, the motor command is compared to the average threshold value ASV, if the motor command is greater than the ASV then the count in the time counter is compared with the maximum count N. If the count is equal to the maximum count N then the controller signals the microcontroller a "motor stall" fault. If not, the motor is "OK" and the method is repeated for the next time interval T.

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