Asynchronous machine with a short-circuit rotor

Details Asynchronous machine with a short-circuit rotor Asynchronous machine with a short-circuit rotor

1994-03-28

1996-03-26

Shoop, Jr., William M.

Electricity: motive power systems

Automatic and/or with time-delay means

Responsive to thermal conditions

318783, 318778, 318139, G05B 500

Patent

active

055023622

ABSTRACT:
An asynchronous machine uses a short-circuit rotor that is rotatably mounted by means of rolling bearings. Damage to the grease-lubricated bearings of the machine is prevented when the machine is started up in a temperature range below or near the freezing point by providing that: (1) before the machine is started and while the rotor is simultaneously locked, a voltage is applied, as a function of the temperature prevailing at the machine at its stator winding, of such magnitude that a current several times the rated machine current flows; and (2) when a certain temperature is reached at predefined parts of the machine or after a certain voltage application time, the current is switched off and the locking of the rotor is released.

REFERENCES:
patent: 4195324 (1980-03-01), Waltz
patent: 4355269 (1982-10-01), Burton et al.
patent: 4678248 (1987-07-01), Depenbrock
patent: 4721894 (1988-01-01), Graber
patent: 4914329 (1990-04-01), Ottersbach
patent: 5113824 (1992-05-01), Haubner
patent: 5138182 (1992-08-01), Kokubu
patent: 5268622 (1993-12-01), Philipp
patent: 5391971 (1995-02-01), Yamada et al.
Patent Abstracts of Japan, vol. 9, No. 19, 25 Jan. 1985 & JP-A-59 165 979 (Hitachi Seisakusho K.K.), 19 Sep. 1984.
Machine Design, vol. 49, 1977, No. 7, E. R. Booser, R. C. Elwell: Keeping Lubricants Flowing at Low Temperatures, pp. 74-79.

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