Circuit arrangement for energy economy

Details Circuit arrangement for energy economy Circuit arrangement for energy economy

1980-09-16

1982-12-14

Smith, Jr., David

Electricity: motive power systems

Braking

Plural, diverse or diversely controlled braking means

318269, 318765, 112277, H02P 540

Patent

active

043640010

ABSTRACT:
An arrangement for energy economy in a drive which includes an induction motor and a clutch-brake unit, particularly for sewing machines is provided. The windings of the induction motor are dimensioned so that the motor speed remains virtually constant in a stable speed range under normal service conditions, and in which the clutch-brake unit serves to control the drive output speed, so that the motor operates in an alternation of load phases and no-load phases. Switches are included in the current paths of the windings, which reduce the current through the windings to a prescribable degree. A modulation circuit to control the acceleration of the motor speed and its persistence in the stable speed range during load variations is associated with the switches. The modulation circuit contains a delay element, which is triggered when the mains voltage is applied, and an impulse prolongation element having a time constant dimensioned so that the motor remains in the stable speed range under all service conditions.

REFERENCES:
patent: 3702127 (1972-11-01), Yokoyama
patent: 3860860 (1975-01-01), Moron et al.
patent: 3885175 (1975-05-01), Palloch
patent: 4011490 (1977-03-01), Daab et al.
patent: 4032648 (1977-10-01), Nola
patent: 4137860 (1979-02-01), Yoneji et al.
patent: 4190793 (1980-02-01), Parker et al.

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