Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A motor control method and control device

A technology of motor control and controller, which is applied in the direction of motor control, motor generator control, and electromechanical transmission control, etc. It can solve problems such as insufficient torque boost, weak load capacity, and large motor heat generation

Active Publication Date: 2020-07-31
CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the V / f control method, due to the obvious voltage division of the stator resistance at low speeds, the starting torque at low speeds is insufficient, resulting in weak load capacity. Therefore, voltage compensation is required at low speeds to improve the load capacity at low speeds. In practice, In application, manual torque boost is not easy to set properly. If the torque boost is too large, the motor will run with over-excitation, the output current of the inverter will increase, the motor will heat up, and the efficiency will be low under light load. unable to start normally
However, the vector control method of the inverter uses more motor parameters, is highly sensitive to motor parameters, and has poor robustness in applications. For applications where it is not easy to identify parameters, the applicability is limited.

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
  • A motor control method and control device
  • A motor control method and control device
  • A motor control method and control device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] Aiming at the deficiencies of the existing V / f control method and the space vector control method, the solution of the present invention is to combine the two to pre-establish a voltage-frequency ratio (V / f) curve. When the motor operates at a constant power below the rated frequency , usually in V / f

[0047] Each voltage-to-frequency ratio on the curve is taken as the flux linkage vector magnitude ψ at its corresponding frequency _ref , combined with the phase angle θ of the flux vector command obtained by integrating the target operating frequency command of the motor _ref , so as to get the flux vector instruction Then according to the flux vector instruction and the observed flux vector of the stator The motor is controlled to improve the low-speed load capacity, no need to artificially adjust the torque boost voltage, the dynamic performance is good, and it can quickly enter a stable state.

[0048] Specifically, the motor control device of the present inven...

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 motor control method. For overcoming the shortcomings of an existing V / f control method and an existing space vector control method, the solution of the invention is to combine the existing V / f control method to the existing space vector control method, a flux linkage vector command is obtained according to a target flux linkage vector phase angle obtained by combinationof an amplitude of a flux linkage command to motor target running frequency command integration, then a motor is controlled according to a flux linkage vector command and an observation flux linkage vector of a stator to improve load capacity at high speed and low speed, the circumstance that torque is manually adjusted to increase voltage is not required, the dynamic property is good, and the motor can enter a stable state quickly. The invention further discloses a motor control device. Compared with the prior art, the motor control method and device have the advantages that the load capacityat high speed and low speed is improved flexibly, the circumstance that the torque is manually adjusted to increase voltage is not required, the dynamic property is good, and the motor can enter thestable state quickly.

Description

technical field [0001] The invention relates to a motor control method. Background technique [0002] The V / f voltage-frequency ratio control method and the vector control method are more commonly used in the existing inverter-based motor control scheme. In the V / f control method, due to the obvious voltage division of the stator resistance at low speeds, the starting torque at low speeds is insufficient, resulting in weak load capacity. Therefore, voltage compensation is required at low speeds to improve the load capacity at low speeds. In practice, In application, manual torque boost is not easy to set properly. If the torque boost is too large, the motor will run with over-excitation, the output current of the inverter will increase, the motor will heat up, and the efficiency will be low under light load. Unable to start normally. However, the vector control method of the frequency converter uses more motor parameters, is highly sensitive to motor parameters, and has po...

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): H02P21/13H02P21/28
CPCH02P21/13H02P21/28H02P2205/01
Inventor 徐丽刘奕骋李志鹏
Owner CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products