Method and apparatus for testing dc motors

Details Method and apparatus for testing dc motors Method and apparatus for testing dc motors

G - Physics

01

R

324/17

G01R 19/00 (2006.01) G01R 31/00 (2006.01) G01R 31/34 (2006.01)

Patent

CA 1040263

ABSTRACT Method and apparatus for testing DC motors, particularly permanent magnet DC motors, involving application of a constant voltage across the motor terminals and at an earlier or later time causing a constant current to flow through the motor. The constant voltage is applied across the motor terminals for a first predetermined time interval during a portion of which the current flow through the motor is compared with a reference level. If the motor current falls below the reference level during the portion of the first predetermined time interval the motor is defective. The constant current is caused to flow through the DC motor for a second predetermined time interval. If at the end of this second predetermined time interval, the DC motor terminal voltage is below a first level or above a second level, that is, the terminal voltage is outside an established voltage range, then the motor is found to be defective.

229818

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