Title:
INDUCTION MOTOR CONTROL DEVICE
Document Type and Number:
Japanese Patent JP3158155
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To realize smooth driving by adopting a frequency corresponding to the rotational speed of residual magnetic flux as the initial value of an acceleration and deceleration limiter at the time of frequency control and adopting the magnitude and the phase of magnetic flux as the initial value of a magnetic flux computing device at the time of torque magnetic flux control.
SOLUTION: A current detector 13' detects an input current to output it to a current detector 17, a phase change detector 18 and a phase detector 19, and the current detector 17 and the phase change detector 18 output the change ΔI of the magnitude and the phase change Δθ of the input current during the period of time of a very short time signal S1 to a initial magnetic flux estimation device 20. Also, the phase detector 19 outputs the phase θi of the input current at the point of time when the very short time signal S1 is changed from 1 to 0 to the initial magnetic flux estimation device 20. The magnitude, the phase and the rotational speed of the residual magnetic flux is estimated to generate the signal of a frequency initial value F10 corresponding to the rotational speed in an acceleration and deceleration limiter 3'. Therefore, a frequency command F1' by which a frequency initial value F10 is adopted as an initial value to a frequency initial value F* is set when the starting signal Soo is 0 in the acceleration and deceleration limiter 3'. As a result, smooth start is realized.
Inventors:
Youichi Ohmori
Application Number:
JP27494595A
Publication Date:
April 23, 2001
Filing Date:
September 28, 1995
Export Citation:
Assignee:
Toyo Denki Manufacturing Co., Ltd.
International Classes:
H02P1/30; H02P21/00; H02P21/05; H02P21/14; H02P21/18; H02P21/22; H02P21/24; H02P21/34; H02P21/36; H02P23/04; H02P23/07; H02P23/14; H02P27/04; H02P27/06; H02P27/08; (IPC1-7): H02P21/00; H02P1/30; H02P5/41
Domestic Patent References:
| JP5268794A | ||||
| JP62285692A | ||||
| JP1157292A | ||||
| JP6460284A |