Sewing machine drive

Details Sewing machine drive Sewing machine drive

1980-10-17

1983-05-17

Truhe, J. V.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318331, 318345R, H02P 506

Patent

active

043842410

ABSTRACT:
A sewing machine drive having a mains rectifier (1) which, via a chopper (2) operating at a relatively high frequency, supplies direct current pulses to the driving motor (3). The duty ratio of these driving pulses is controlled as a function of a nominal value transmitter (11) and a current limiting circuit (14) controlled by the motor speed. This produces a smooth quiet, vibration-free operation of the motor (3) or the driven machine with a high degree of motor efficiency. Moreover, a speed-dependent current limitation occurs in such a manner that at high speeds a limited maximum current flows, which at the same time results in an output limitation.

REFERENCES:
patent: 4151450 (1979-04-01), Fukuma et al.
patent: 4152632 (1979-05-01), Peterson
patent: 4182979 (1980-01-01), Douglas et al.
patent: 4299182 (1981-11-01), Tanaka
IBM Disc. Bulletin, vol. 8, No. 12, May, 1966, pp. 1767-1768--by V. C. Martin--Dual Speed Motor.
Lutjens, "Schaltregler mit hochspannungsfestern Transistor fur Permanentmagnet-Motoren," Elektronik, vol. 26, No. 5, 1977; pp. 73-78.

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