Method of determining the efficiency of asynchronous motors and

Details Method of determining the efficiency of asynchronous motors and Method of determining the efficiency of asynchronous motors and

1996-08-09

1997-08-19

Sircus, Brian

Electricity: motive power systems

Power factor control of armature or line circuit

318798, 324545, H02P 528

Patent

active

056592329

ABSTRACT:
In the no-load state of operation of a running asynchronous motor, after separating the no-load copper losses as well as the sum of the iron losses and friction losses and taking into consideration the rated current of the motor and the rated rate of rotation, an upper limiting value of the rated efficiency of the motor is determined while assigning the iron losses and the friction losses to the stator losses and a lower limiting value of the rated efficiency of the motor is determined while assigning the iron losses and the friction losses to the rotor losses. In the loaded state of operation of the running asynchronous motor, while taking into consideration the copper losses resulting from the no-load copper losses, the no-load current, the current input and the rate of rotation of the loaded asynchronous motor, an upper limiting value of the motor efficiency is determined in the actual load condition while assigning the iron losses and friction losses to the stator losses and a lower limiting value of the motor efficiency is determined in the actual load condition while assigning the iron losses and friction losses to the rotor losses. The range of the actual rated efficiency of the motor is defined by the upper and lower limiting values of the rated efficiency of the motor and the range of the actual load efficiency is defined by the upper and lower limiting values of the motor efficiency in the actual load condition.

REFERENCES:
patent: 4450398 (1984-05-01), Bose
patent: 4922172 (1990-05-01), Roddy et al.
patent: 5262717 (1993-11-01), Bolegoh
patent: 5272429 (1993-12-01), Lipo et al.
patent: 5420523 (1995-05-01), Walker et al.
patent: 5506486 (1996-04-01), Hayashi et al.

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