SENSORLESS VECTOR CONTROL APPARATUS FOR INDUCTION MOTOR SPEED

申请公布号：JPH0870599(A)

申请号：JP19940204766

申请日期：1994.08.30

申请公布日期：1996.03.12

申请人：

MEIDENSHA CORP

发明人：YAMADA KATASHIGE

分类号：H02P21/00;H02P27/04

主分类号：H02P21/00

摘要：PURPOSE: To limit speed so that an induction motor will not be over-rotated even if speed command value is too large. CONSTITUTION: A sensorless vector control apparatus for induction motor speed estimates a value of actual speed of an induction motor 1 by means of a speed adaptation secondary magnetic flux observer, composed of an identical dimension magnetic flux observer 4 and a speed adaptation mechanism 7, and provides vector control by controlling a current control unit through a signal indicating an error between estimated motor speed value ωr * and motor speed command value ωr *. When estimated speed value ωr * exceeds maximum speed ωrmax , an over-rotation preventing apparatus 21 zeros primary torque axis current command value i1b * to prevent torque in the direction of acceleration from being generated and the induction motor 1 from being over-rotated.

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