Patent ID: 6338029
Filing Date: 2002-01-08
Classification: G01R,H02K

Abstract:
In testing apparatus arranged for coupling to a motor, the motor including a motor current, a method for determining when the motor is acceptable, the method comprising:a) measuring a time required for the motor to reach a running speed in a steady state, thus forming a time-to-speed parameter, b) measuring a difference between an instantaneous speed and an average speed in the steady state, thus forming a speed variation parameter, c) measuring a maximum value of the motor current, thus forming a maximum current parameter, d) measuring a motor current in the steady state, thus forming a running current parameter, e) measuring a motor vibration energy in the steady state, thus forming a vibration energy parameter, and f) determining when the motor is acceptable based on the time-to-speed parameter, the speed variation parameter, the maximum current parameter, the running current parameter and the vibration energy parameter.