Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2006-02-28
2006-02-28
Fletcher, Marlon T. (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S727000, C318S798000, C318S799000, C318S809000, C318S811000
Reexamination Certificate
active
07005828
ABSTRACT:
Corresponding to a target torque, the control device calculates a target value of a feature based on at least one of the length of a long axis of a current vector locus and the length of the short axis and further superimposes a superimposed current on a drive current for the motor, the superimposed current having a frequency different from the frequency of the drive current. Further, the control device detects an actual value of the feature based on at least one of the length of a long axis of a current vector locus of the superimposed current and the length of the short axis of the same and finally detects a phase angle of the motor based on the target value and the actual value for the feature. The manipulation of a detecting phase is performed by feedback of a feature obtained by the magnitude of the superimposed current. That is, when the actual feature is more than the target value, the detecting phase is advanced. Conversely, when the actual feature is less than the target value, the detecting phase is delayed.
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Fletcher Marlon T.
Foley & Lardner LLP
Miller Patrick
Nissan Motor Co,. Ltd.
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