Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1998-03-13
2000-01-11
Martin, David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318808, H02P 534
Patent
active
060140054
ABSTRACT:
A circuit arrangement is provided for controlling an electric motor (2), in particular a three-phase, three-strand motor, which is coupled to an intermediate circuit voltage (4) via a DC/AC converter (3) having three DC/AC converter branches (7,8,9). A measuring signal (i.sub.b1,i.sub.b2,i.sub.b3) which is proportional to the branch current is derived from each of the DC/AC converter branches (7,8,9), and a control signal (I.sub.pn), which is substantially proportional to the total value of the strand currents (i.sub.1,i.sub.2,i.sub.3) of the motor, is derived from these measuring signals (i.sub.b1,i.sub.b2,i.sub.b3).
Faller F. Brice
Martin David
U.S. Philips Corporation
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