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Patent Searching and Data


Title:
CONTROLLER FOR AC VARIABLE SPEED MOTOR
Document Type and Number:
Japanese Patent JP01198296
Kind Code:
A
Abstract:

PURPOSE: To reduce speed reduction rate and to improve stability, by performing constant frequency variable speed control upon occurrence of instantaneous voltage drop.

CONSTITUTION: Upon occurrence of instantaneous voltage drop, an instantaneous voltage drop detector 66 functions while simultaneously the output from a voltage/frequency setter 63 is utilized for feeding command values corresponding to voltage, frequency and the like prevailing prior to fault to a voltage control section 31 and a frequency control section 36. The gate of a D/A converter 24 is controlled such that a frequency setting signal transmitted from the voltage/frequency setter 63 has frequency specified through the frequency control section 56. Consequently, an induction motor 26 can produce electrical torque even upon droppage of voltage.


Inventors:
Katatsume, Tomoo
Application Number:
JP1988000022049
Publication Date:
August 09, 1989
Filing Date:
February 03, 1988
Export Citation:
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Assignee:
TOSHIBA CORP
International Classes:
H02P25/04; H02P27/06; H02P25/02; H02P27/04; (IPC1-7): H02P7/63