Process and apparatus for correlating startup and cutoff periods

Details Process and apparatus for correlating startup and cutoff periods Process and apparatus for correlating startup and cutoff periods

1984-03-14

1985-05-21

Roskoski, Bernard

Electricity: motive power systems

Plural, diverse or diversely controlled electric motors

Running-speed control

318 51, 318 86, H02P 546

Patent

active

045188998

ABSTRACT:
In textile machinery wherein two or more loads--such as transport rollers of a tension frame and a bank of spindles carrying take-up spools--are driven by respective three-phase motors of the asynchronous (induction) type at speeds which are different from each other but are to be mutually correlated during an entire operating cycle including a startup and a cutoff period, the motor with the shorter acceleration time is slowed down during startup to let it reach its operating speed substantially at the same time as the other motor whereas the motor with the longer deceleration time is braked during cutoff in order to reach standstill substantially simultaneously with the other motor. The slowdown during startup and the braking during cutoff can be controlled by a comparator which determines deviations of the speed ratio of the two motors from a predetermined reference value.

REFERENCES:
patent: 2558885 (1951-07-01), Stevens et al.
patent: 3118097 (1964-01-01), Hettler
patent: 3248628 (1966-04-01), Rogers
patent: 3253203 (1966-05-01), Bardwell
patent: 3849718 (1974-11-01), Forster et al.
patent: 4308489 (1981-12-01), Bergmann
patent: 4326154 (1982-04-01), Lewis et al.

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