Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2007-08-14
2010-11-02
Benson, Walter (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S801000, C318S490000
Reexamination Certificate
active
07825620
ABSTRACT:
A controller and a constant measuring apparatus have a means for supplying a synthesized current, resulting from superimposing an AC current to a DC current, from an inverter and for changing the DC current component of the synthesized current continuously or discontinuously. Accordingly, the controller and constant measuring apparatus can measure inductances, which are electric constants of the AC motor, with high accuracy and can use the measured inductances for control.
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Office Action in Chinese Patent Appln. 200710140846.5, dated Jul. 31, 2009; with partial English language translation of the First Chinese Office Action (the text) [4 pages].
Iwaji Yoshitaka
Nakatsugawa Junnosuke
Tobari Kazuaki
Antonelli, Terry Stout & Kraus, LLP.
Benson Walter
Hitachi , Ltd.
Paul Antony M
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