Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2011-03-08
2011-03-08
Ip, Paul (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S799000, C318S807000, C318S757000, C318S400300, C318S400020
Reexamination Certificate
active
07902790
ABSTRACT:
A slip frequency is estimated from a current instruction or detected currents in an induction motor. Acceleration impossibility in an induction motor drive unit is determined, when the slip frequency exceeds the maximum torque generating slip frequency for the predetermined interval or the time integrating result exceeds a predetermined value; when the q-axis magnetic flux exceeds the maximum torque generating q-axis magnetic flux or exceeds for a predetermined interval; when the estimated rotational speed is under a predetermined value; when the rotational speed variation rate is negative; and when the rotational speed instruction value or the estimated rotational speed is equal to or smaller than a predetermined value. An induction motor drive system and an elevating system including the induction motor drive unit are also disclosed.
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Arakawa Yoichiro
Nagata Koichiro
Tomita Hiroyuki
Antonelli, Terry Stout & Kraus, LLP.
Hitachi Industrial Equipment Systems Co. Ltd.
Ip Paul
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