Automatic motor testing method and apparatus

Details Automatic motor testing method and apparatus Automatic motor testing method and apparatus

G - Physics

01

R

G01R 31/34 (2006.01) G01L 5/26 (2006.01) G01M 15/04 (2006.01)

Patent

CA 2118590

2118590 9306448 PCTABS00021 A method and apparatus for testing the starting torque of electric motors (30) includes attaching a flywheel (35) of known diameter and weight to the motor's shaft along with an incremental encoder (60) and measuring the amount of shaft rotation during known time intervals. A counter (100) receives the output pulses from the encoder and a data latch (110) captures the value of the counter at regular time intervals, such as once or twice during a cycle of an alternating current power line or upon zero crossing of the current to the motor. The count for each interval is retained in computer memory (200) and later compared with a previous counter to indicate changes in RPM from one interval to another. The change in RPM is a function of torque and can be plotted against motor speed, which is also calculated from the encoder output.

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