Electric motor system

Details Electric motor system Electric motor system

2006-01-23

2008-10-21

Donovan, Lincoln (Department: 2837)

Electricity: motive power systems

Limitation of motor load, current, torque or force

C318S286000, C318S468000

Reexamination Certificate

active

07439698

ABSTRACT:
An electric motor system having a rotor with a plurality of permanent magnets, and a stator having a winding through which current is flowing for driving the rotor. A control unit controls the current flowing through the winding. The control unit employs a first filter and a second filter, each filter is connected to the winding and has outputs coupled to a comparator. The comparator compares the signal output of the first filter to the signal output of the second filter. The control unit controls the current flowing through the winding depending on the result of the comparison of the two filtered signals.

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patent: 2006/0197480 (2006-09-01), Mori et al.
patent: 20040472909 (2004-03-01), None

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