Electricity: motive power systems – Limitation of motor load – current – torque or force
Reexamination Certificate
2007-01-16
2007-01-16
Ip, Paul (Department: 2837)
Electricity: motive power systems
Limitation of motor load, current, torque or force
C318S432000, C180S446000
Reexamination Certificate
active
10839153
ABSTRACT:
In an electric motor drive apparatus capable of reliably preventing adverse effects on an electric motor, when a control force detected by a torque sensor exceeds a predetermined value, a temperature storing unit stores a temperature detected by a thermistor at that time, and a deviation calculating unit calculates a deviation between the next temperature detected by the thermistor and the temperature stored in the temperature storing unit. When the calculated deviation exceeds a predetermined value, a current limit decision unit sends a limit signal to a current limiting unit. Upon receipt of the limit signal, the current limiting unit gradually decreases the upper limit value of current flowing in the electric motor at a predetermined time interval.
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Office Communication from European Patent Office issued on Mar. 6, 2006 for the corresponding European patent application No. 04010860.7-2425 (a copy thereof).
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