Electricity: motive power systems – Motor structure adjustment or control
Reexamination Certificate
2011-01-11
2011-01-11
Ro, Bentsu (Department: 2837)
Electricity: motive power systems
Motor structure adjustment or control
C318S558000
Reexamination Certificate
active
07868573
ABSTRACT:
A drive circuit includes an ac network and first and second network rectifier/inverters (which can be active or passive) that are connected to the ac network in parallel. A first PWM rectifier/inverter is connected to the first network rectifier/inverter through a first dc link. A second PWM rectifier/inverter is connected to the second network rectifier/inverter through a second dc link. A first two-layer stator winding having a plurality of individual stator coils is connected to the first PWM rectifier/inverter and a second two-layer stator winding having a plurality of individual stator coils is connected to the second PWM rectifier/inverter. The stator coils of the first stator winding and the stator coils of the second stator winding are interconnected such that, in use, the vector sum of voltages across the stator coils in the first stator winding is substantially equal to the vector sum of voltages across the stator coils in the second stator winding. This has the advantageous effect of reducing the PWM frequency current harmonics flowing in the first and second stator windings.
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Converteam UK Ltd
Kirschstein et al.
Ro Bentsu
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