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

A Method of Off-line Identification of Motor Parameters Using Cascaded High-Voltage Frequency Converter

A high-voltage inverter and motor parameter technology, which is applied in the direction of motor generator testing, instruments, and measuring electricity, can solve problems such as errors, and achieve the effects of increasing duty cycle, reducing errors, and improving identification accuracy

Active Publication Date: 2022-02-18
SHANGHAI STEP ELECTRIC +1
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the nonlinearity of the switching device of the inverter of the frequency converter, there is an error between the actual voltage value applied to both ends of the motor winding and the theoretical output voltage value of the inverter.

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 Method of Off-line Identification of Motor Parameters Using Cascaded High-Voltage Frequency Converter
  • A Method of Off-line Identification of Motor Parameters Using Cascaded High-Voltage Frequency Converter
  • A Method of Off-line Identification of Motor Parameters Using Cascaded High-Voltage Frequency Converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] When using a high-voltage inverter to identify the motor resistance, since the motor impedance may be very small, the output voltage of the high-voltage inverter will be relatively low, usually only 10V to 20V. At this time, the PWM duty cycle of each H-bridge power unit is very small, and the switching device of the power unit is non-linear (dead zone, IGBT and diode conduction voltage drop, too small duty cycle leads to incomplete IGBT conduction, etc.) The impact is relatively large, making the output voltage reconstructed through the duty cycle and the bus voltage inaccurate, resulting in poor accuracy of the identified motor parameters and affecting the motor control effect.

[0034] According to an embodiment of the present invention, a method for offline identification of motor parameters using cascaded high-voltage inverters is mainly different from the ...

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 offline identification of motor parameters by using a cascaded high-voltage frequency converter. Each phase bridge arm of the high-voltage frequency converter is composed of n power units connected in series, wherein n is an integer greater than or equal to 3; The method for offline identification of motor parameters using a high-voltage frequency converter includes the step of applying a DC signal or an AC signal to the motor, wherein, before applying the DC signal or AC signal to the motor, at least one of the n power units of each phase bridge arm One power unit is bypassed. The invention can effectively reduce the error caused by the non-linearity of the power device and improve the identification accuracy of the motor parameters.

Description

technical field [0001] The invention relates to a method for identifying motor parameters by using a cascaded high-voltage frequency converter. Background technique [0002] The off-line identification of motor parameters is mainly to inject DC signals or AC signals into the motor windings through the frequency converter, and sample the motor current and output voltage signals of the frequency converter through the frequency converter, and perform corresponding calculation processing to obtain the model parameters of the motor. These motor parameters include motor stator resistance, motor inductance value, motor rotor resistance, mutual inductance between stator and rotor, etc. [0003] The identification of motor stator resistance is usually measured by DC voltammetry. Through current control technology, a low-voltage direct current is passed between any two phase windings of the motor while keeping the third phase current at 0. figure 1 A schematic diagram of the connecti...

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): G01R31/34
CPCG01R31/346
Inventor 陈伟李兴鹤张震宇曾彦能
Owner SHANGHAI STEP ELECTRIC