Electricity: motive power systems – Induction motor systems – Braking
Patent
1980-08-06
1985-09-24
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Braking
318760, 318773, H02P 318
Patent
active
045435197
ABSTRACT:
A strand-advancing system, particularly for a drawing frame, has an asynchronous electric motor powered from an alternating-current source and having a plurality of separate windings forming separate poles. This motor has a rotary output speed directly related to the advance speed of the filament. During normal operation the motor is driven at a relatively high nominal speed by connecting a relatively small group of its poles to the alternating-current source. The strand advance is stopped by first simultaneously disconnecting the relatively small group of poles from the alternating-current source and connecting a relatively large group of the poles to the source to operate the motor hypersynchronously generator-fashion for a relatively short time. Then the relatively large group is disconnected from the alternating-current source and the small group is energized with direct-current voltage until the motor and strand stop.
REFERENCES:
patent: 2393998 (1946-02-01), Mahnke
patent: 2677087 (1954-04-01), Willmott
patent: 3584278 (1971-06-01), Krabbe
patent: 3860093 (1975-01-01), Mitsui et al.
patent: 4145645 (1979-03-01), Price et al.
Dubno Herbert
Ross Karl F.
Smith Jr. David
Zinser Textilmaschinen GmbH
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