Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2006-09-27
2009-10-13
Leykin, Rita (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S767000, C318S798000, C318S700000, C318S400010
Reexamination Certificate
active
07602138
ABSTRACT:
An apparatus for controlling the drive of an electric motor, having a current detector for detecting the current through an externally connected electric motor; a controller for generating a control signal to control the electric motor on the basis of the current detected by the current detector and the speed command for specifying the rotational speed of the electric motor; wherein the apparatus includes a load estimator for estimating the mechanical load condition associated with the electric motor on the basis of the current detected by the current detector and the speed command, and the controller controls the electric motor current on the basis of the detected current, the speed command and the estimated load condition.
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Endo Tsunehiro
Kaneko Daigo
Suzuki Takahiro
Tobari Kazuaki
Uematsu Hajime
Antonelli, Terry Stout & Kraus, LLP.
Hitachi Industrial Equipment Systems Co. Ltd.
Leykin Rita
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