Method and apparatus for measuring friction torque

Details Method and apparatus for measuring friction torque Method and apparatus for measuring friction torque

1994-09-09

1995-08-15

Raevis, Robert

Measuring and testing

Frictional resistance, coefficient or characteristics

G01M 1900

Patent

active

054409152

ABSTRACT:
Friction torque of a motor undergoing testing is measured by supporting an electrical motor on a test fixture and connecting a torque measuring device to its output shaft. The motor shaft is rotated in the reverse direction and while the motor shaft is freely rotating, power is applied to the motor and two torque measurements are taken to determine friction torque. The first is while the motor is still rotating in the reverse direction, and the second is taken from zero rpm to approximately 50 rpm. In both cases, the torque is measured while the motor shaft is near zero rpm, thus representing locked rotor torque. Half the difference between these two torque measurements will yield the value for friction torque. Motor torque is continued to be measured while the motor is accelerated to its maximum speed, and the value of this measured torque can then be adjusted by the value of the friction torque to provide a measurement of the actual torque of the motor being tested.

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