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

Tracking Method of High-Voltage Variable-Frequency Motor Idling Speed

A high-voltage motor and idling speed technology, which is applied to the control of generators, motor generators, electronic commutation motors, etc., can solve the problems that the scheme of detecting the frequency of the DC bus rotor can not be used, and achieve smooth start, easy to implement, Start smooth effect

Inactive Publication Date: 2015-10-07
ANHUI EHE NEW ENERGY TECH
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is theoretically feasible, but there is no DC bus current detection in the power unit of the high-voltage inverter, so the scheme of indirectly detecting the rotor frequency by detecting the DC bus current cannot be used

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
  • Tracking Method of High-Voltage Variable-Frequency Motor Idling Speed
  • Tracking Method of High-Voltage Variable-Frequency Motor Idling Speed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] Such as figure 1 As shown, a high-voltage frequency conversion motor idling speed tracking method, when the high-voltage motor is freely rotating, the digital signal processing chip DSP is used to input a scanning voltage to the high-voltage motor, and the scanning voltage is proportional to the UF curve when the high-voltage motor is running normally , the scanning voltage corresponds to the scanning frequency one by one and changes with the scanning frequency, the UF curve is as follows figure 2 As shown, the output current of the high-voltage motor is sampled, and the digital signal processing chip DSP calculates the instantaneous value of the third phase according to the instantaneous value of the sampled two-phase current, calculates the total current vector value according to the instantaneous value of the three-phase current, and ensures The change of the current is within the set range, and the digital signal processing chip DSP calculates the motor power at th...

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 method for tracking no-load rotating speed of a high-voltage variable frequency motor. The method includes that a speed sensor is not needed, torque current is detected after scanning voltage is input into the freely-rotating motor, a microprocessor is utilized to calculate power of the motor while current size is controlled, and when the power of the motor converts from a positive value to a zero point of a negative value, detection of rotating speed is thought to be realized. Synchronization of rotating speed of a stator and a rotor is realized through indirectly judging frequency of the rotor. Smooth startup of the high-voltage motor with the rotor under nonstatic condition is realized without using the speed sensor, startup is smooth, algorithm is simple, implementation is easy, and cost increase is not needed.

Description

technical field [0001] The invention relates to the technical field of high-voltage frequency conversion control, in particular to a method for tracking the idling speed of a high-voltage frequency conversion motor applied in a high-voltage frequency conversion control system. Background technique [0002] High-power high-voltage inverters are widely used in various fan and pump equipment in petrochemical, electric power, metallurgy, urban construction and other industries, and play an important role in reducing consumption, saving energy, and improving processes. In many large-scale motor drive systems, especially in fan applications, the moment of inertia of the rotor and the equipment it carries is very large, and the free stop time from the rotating state to the stationary state ranges from tens of minutes to several hours. If there is a power failure of the frequency converter, the motor will rotate freely and immediately re-power on and start directly. The excessiv...

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): H02P21/14H02P21/18
Inventor 唐韦韦杨春正蔡珊珊赵娟沈庆赵洁栾振虎姚俊马志保
Owner ANHUI EHE NEW ENERGY TECH