Motor driving apparatus

Details Motor driving apparatus Motor driving apparatus

1996-10-28

1999-03-30

Martin, David

Electricity: motive power systems

Limitation of motor load, current, torque or force

318432, 180446, 701 41, H02K 1732

Patent

active

058893768

ABSTRACT:
A motor driving apparatus which makes it possible to continue a suppressed power supply to an electric motor even when a detected value (Id) of a current flowing to an H-bridge circuit indicates abnormality, to thereby prevent occurrence of shock in a system in which the motor is employed as a drive source. The apparatus includes a current detecting device (12) for detecting an electric current (I) flowing to an H-bridge circuit (1), and a control device (20) which includes an abnormality decision device (24) for determining abnormality of the detected current value (Id) outputted from the current detecting device (12). When the detected current value (Id) indicates abnormality, both of the ones (Q1; Q4) of the transistors (Q1; Q2 and Q3; Q4) inserted at the side of the power supply source (3) and the ground (GND), respectively, are driven under the PWM control.

REFERENCES:
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patent: 5404960 (1995-04-01), Wada et al.
patent: 5457364 (1995-10-01), Biotti et al.
patent: 5485067 (1996-01-01), Nishimoto et al.
patent: 5552684 (1996-09-01), Wada et al.
patent: 5642247 (1997-06-01), Giordano

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