Method and device for enlarging a stoppage safety function for e

Details Method and device for enlarging a stoppage safety function for e Method and device for enlarging a stoppage safety function for e

1990-10-23

1992-01-21

Shoop, Jr., William M.

Electricity: motive power systems

Limitation of motor load, current, torque or force

361 23, H02H 708

Patent

active

050830686

ABSTRACT:
In order to obtain a stoppage safety function for electric motors, in particular such intended for driving power-driven screwing machines with intermediate stepping-down gears, it is proposed that the system be prevented from dropping once more below the cut-off threshold determined by the control circuit (U211B) once the electric motor has been switched-off for the first time due to the stoppage-safety function, in that an electric storage (C1) is provided for holding the stored voltage even when, after the system has been switched off, a new tachogenerator signal should be produced due to a momentary return motion resulting from the mechanical release and the stresses that have built up in the mechanical drive train.

REFERENCES:
patent: 3892146 (1975-07-01), Yasoshima
patent: 4066942 (1978-01-01), Bardwell et al.
patent: 4347993 (1982-09-01), Leonard
patent: 4455012 (1984-06-01), Gupta
patent: 4463293 (1984-07-01), Hornung et al.
patent: 4823087 (1989-04-01), Eley
Telefunken Electronic, U211B Circuit Chip, 1984.

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