JP2005304175A5

JP2005304175A5 -

Info

Publication number: JP2005304175A5
Application number: JP2004116556A
Authority: JP
Filing date: 2004-04-12
Publication date: 2007-05-24

Claims

In the motor speed control device,
Speed detecting means for detecting the motor speed based on position or speed information input from an external detector;
An observer that computes and estimates the motor speed based on the state variable output by the speed control device and the motor speed composite value;
A speed controller that determines a command current based on the speed feedback amount and the speed command value of the motor, with either one of the motor speed calculation estimated value or the motor speed combined value by the observer as a speed feedback amount,
When the motor speed is low, based on the speed detection value by the speed detection means, in the high speed range, based on a calculation estimated value of the motor speed by the observer, in the middle speed range, the speed detection value and the motor speed. A speed control device comprising speed synthesis means for outputting the motor speed synthesized value based on the calculated estimated value.

In the induction motor speed control device,
Speed detecting means for detecting the motor speed based on position or speed information input from an external detector;
An observer that computes and estimates the motor speed based on the state variable and the motor speed composite value output by the speed control device;
A speed controller that determines a command current based on the speed feedback amount and the speed command value of the motor, with either one of the motor speed calculation estimated value or the motor speed combined value by the observer as a speed feedback amount,
A slip frequency calculator for calculating and outputting the slip frequency;
When the motor speed is low, based on the speed detection value by the speed detection means, in the high speed range, based on a calculation estimated value of the motor speed by the observer, in the middle speed range, the speed detection value and the motor speed. A speed control device comprising speed synthesis means for outputting the motor speed synthesized value based on the calculated estimated value of the motor.

In the induction motor speed control device,
Speed detecting means for detecting the motor speed based on position or speed information input from an external detector;
An observer that computes and estimates the phase and motor speed based on the state variable and the motor speed composite value output by the speed control device;
A slip frequency calculator for calculating and outputting the slip frequency;
A differentiator for differentiating the operation estimated value of the phase by the observer;
A first subtractor for subtracting the output of the slip frequency calculator from the output of the differentiator;
A speed controller that determines a command current based on a speed command value of the motor and an output of the subtractor;
When the motor speed is low, based on the speed detection value by the speed detection means, in the high speed range, based on a calculation estimated value of the motor speed by the observer, in the middle speed range, the speed detection value and the motor speed. A speed control device comprising speed synthesis means for outputting the motor speed synthesized value based on the calculated estimated value.

A first weight function unit that receives a speed detection value obtained by the detection means;
A second weight function unit that receives an operation estimated value of the motor speed by the observer as an input;
The speed synthesizing unit adds the output of the first weight function unit and the output of the second weight function unit, and uses the added value as a motor speed synthesis value in a medium speed range. The speed control device according to any one of claims 1 to 3.

The speed detection means detects a motor speed based on position or speed information input from an external detector on a load side connected to the motor via a power transmission means. The speed control device according to claim 4.

A second subtracter for subtracting a speed detection value from the speed detection means from a speed command value;
An integrator for integrating the second subtractor output;
3. A slip frequency correction means for outputting a multiplication value obtained by multiplying the output of the slip frequency calculator by the output of the integrator as an output correction amount to the slip frequency unit. 3. The speed control device according to 3.