Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2005-11-29
2005-11-29
Ro, Bentsu (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C363S043000
Reexamination Certificate
active
06969967
ABSTRACT:
A circuit for controlling an ac machine comprises a full bridge network of commutation switches which are connected to supply current for a corresponding voltage phase to the stator windings, a plurality of diodes, each in parallel connection to a respective one of the commutation switches, a plurality of dc source connections providing a multi-level dc bus for the full bridge network of commutation switches to produce sinusoidal voltages or PWM signals, and a controller connected for control of said dc source connections and said full bridge network of commutation switches to output substantially sinusoidal voltages to the stator windings. With the invention, the number of semiconductor switches is reduced to m+3 for a multi-level dc bus having m levels. A method of machine control is also disclosed.
REFERENCES:
patent: 3919619 (1975-11-01), Corry
patent: 4032832 (1977-06-01), Miller
patent: 4685043 (1987-08-01), Mehnert
patent: 5757633 (1998-05-01), Bowles
patent: 6075350 (2000-06-01), Peng
patent: RE37126 (2001-04-01), Peng et al.
patent: 6577087 (2003-06-01), Su
Quarles & Brady LLP
Ro Bentsu
UT-Battelle LLC
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