Unlock instant, AI-driven research and patent intelligence for your innovation.

Estimation method of asynchronous motor speed based on gopinath model

A technology for asynchronous motors and rotational speed estimation, which is applied in the control of generators, motor generators, and electronically commutated motors. Small amount of effect

Active Publication Date: 2019-06-11
SHAANXI SIWEI WEIGHING APP LIMITED
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of low speed sensorless asynchronous motors, the traditional speed estimation model is easily affected by motor parameters, large amount of calculation and low precision, etc., the present invention proposes a method for estimating the speed of asynchronous motors based on the Gopinath model

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Estimation method of asynchronous motor speed based on gopinath model
  • Estimation method of asynchronous motor speed based on gopinath model
  • Estimation method of asynchronous motor speed based on gopinath model

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] 1. Gopinath model

[0020] The rotor flux linkage ψ under the Gopinath model is as follows:

[0021]

[0022] After derivation, it can be concluded that:

[0023]

[0024] in:

[0025] ψ represents the flux linkage estimated by the Gopinath model, ψ u represents the flux linkage estimated by the voltage model, ψ i represents the flux linkage estimated by the current model, is a first-order high-pass filter.

[0026] It can be seen from Equation 2 that the rotor flux linkage ψ is determined by the rotor flux linkage ψ under the voltage model u and the rotor flux linkage ψ under the current model i Therefore, the estimation errors of these two models will affect the final rotor flux linkage error. The influence of these two models on the flux linkage estimation will be analyzed in turn below.

[0027] (1) Current model

[0028] Under the current model, the rotor flux linkage is determined by the excitation current component I d calculated, and I d is dete...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a Gopinath model-based asynchronous motor rotary speed estimation method. In a high-rotary-speed condition, it is relatively accurate to estimate rotor magnetic flux linkage by a voltage model while it is relatively accurate to estimate rotor magnetic flux linkage by a current model in a low-rotary-speed condition; therefore, for avoiding the problems of complex structure, huge calculated amount and the like of a magnetic flux linkage estimation model caused by introduction of a high-low-rotary-speed switching module, the Gopinath model with phase compensation is specifically introduced to estimate the rotor magnetic flux linkage; the model, by combination of the current model and the voltage model, can realize accurate estimation on the rotor magnetic flux linkage in a full-stage rotary speed; accurate estimation on the rotor magnetic flux linkage in a full-stage rotary speed is realized without adopting the switching module, and the rotor speed is further obtained through estimation; and the asynchronous motor rotary speed can be accurately estimated in a low-rotary-speed condition by the model.

Description

technical field [0001] The invention relates to a speed sensorless AC asynchronous motor, in particular to a method for estimating the rotational speed of an asynchronous motor based on a Gopinath model. Background technique [0002] Existing speed estimation methods for asynchronous motors mainly include model reference adaptive method, extended Kalman filter and high frequency injection method, etc. [0003] The model reference adaptive method uses two motor models with different structures to estimate the rotor flux linkage of the motor. In this method, the rotor flux linkage voltage model without the speed factor is used as the reference model, and the rotor flux linkage current model with the speed factor is used as the reference model. adaptive model. The adaptive mechanism is driven by the difference between the outputs of the two models, and the estimated value of the rotational speed is calculated and fed back to the adaptive model to modify the adaptive model, and...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/26H02P21/18
Inventor 刘小勇蒋峰
Owner SHAANXI SIWEI WEIGHING APP LIMITED