Apparatus and method for the thermal simulation of a constant lo

Details Apparatus and method for the thermal simulation of a constant lo Apparatus and method for the thermal simulation of a constant lo

1978-08-10

1980-08-05

Smith, Jr., David

Electricity: motive power systems

Automatic and/or with time-delay means

Responsive to thermal conditions

361 25, 318399, H02P 300

Patent

active

042164214

ABSTRACT:
An indication is derived of the thermal properties of a constant load motor during acceleration and deceleration periods without actually monitoring thermal properties of the motor. The motor is accelerated and/or decelerated in response to command pulses so there is a rotational speed change during the acceleration and deceleration periods. In respnse to the command pulses, the charge on a capacitive means is changed so the charge change is proportional to (1) the change of the motor rotation speed during the periods and (2) the reciprocal of the periods. In response to the charge change there is derived an indication of the thermal properties as a function of the electrical, thermal and mechanical characteristics of the motor.

REFERENCES:
patent: 3387182 (1968-06-01), Fourr
patent: 3735219 (1973-05-01), Kahn et al.
patent: 3808516 (1974-04-01), Hentschel
patent: 3809960 (1974-05-01), Jossic
patent: 3860861 (1975-01-01), Gucker
patent: 4135217 (1979-01-01), Jacques et al.

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