Electricity: motive power systems – Synchronous motor systems – Synchronization systems
Reexamination Certificate
2005-12-27
2005-12-27
Fletcher, Marlon T. (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Synchronization systems
C318S717000, C318S719000, C318S720000, C318S721000, C318S798000, C318S799000, C318S254100, C318S700000
Reexamination Certificate
active
06979975
ABSTRACT:
In a conventional rotation state detecting apparatus of a synchronous machine, since short-circuiting must be carried out twice or more when a rotation speed is detected, there have been problems in that it takes a time to detect a rotation state, and it takes a time to start up. A rotation state detecting apparatus for a synchronous machine according to the present invention has been made to solve the above problem, and includes a calculation unit for outputting a voltage vector command and a trigger signal and for outputting a rotation state of a synchronous machine having at least three windings in an idle state, a circuit unit for applying voltages to the respective phases of the synchronous machine on the basis of the voltage vector command, and a detection unit for detecting a current of the synchronous machine on the basis of the trigger signal and outputting a value of the detected current to the calculation unit. The calculation unit outputs a voltage vector for short-circuiting the respective phases of the synchronous machine, outputs trigger signals on at least one occurrence of the short-circuiting to produce current values from the detection unit multiple times, and calculates a rotation speed and a rotation position of the synchronous machine.
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Kaitani Toshiyuki
Kinpara Yoshihiko
Fletcher Marlon T.
Leydig , Voit & Mayer, Ltd.
Mitsubishi Denki & Kabushiki Kaisha
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