Measuring and testing – Test stand – For engine
Patent
1995-03-30
1996-04-09
Raevis, Robert
Measuring and testing
Test stand
For engine
G01M 1500
Patent
active
055050786
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.
REFERENCES:
patent: 3505863 (1970-04-01), Lucia
patent: 3942365 (1976-03-01), Hanson et al.
patent: 4204425 (1980-05-01), Mallick, Jr.
patent: 4741182 (1988-05-01), Didies et al.
patent: 5327790 (1994-07-01), Levin et al.
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