It is common practice in the manufacture of electric motors to individually test newly manufactured motors under load to verify proper motor performance and to identify any of a number of potential defects which may have occurred in the manufacturing process. In conventional practice, the armature of a motor under test is connected to a dynamometer, and the motor windings are energized at a typical operating point. The motor voltage, current, power factor, and the like are typically measured and compared to limit values to generate a pass/fail indication for the motor.
With the above-described test procedure, the dynamometers must be carefully calibrated and aligned in order to prevent unwarranted motor fail indications. This, of course, can be very costly and time consuming.
USPTO Backgrounds
USPTO Backgrounds