Method for identifying parameters of brushless direct current motor

A brushed DC motor, parameter identification technology, applied in the direction of electronic commutation motor control, electrical components, control systems, etc., can solve problems such as complex theory, achieve the effect of simple and feasible theory, avoid errors, and avoid error accumulation

Inactive Publication Date: 2013-12-18
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

However, the theory is complex and requires the three-phase current of the motor. Only the inductance and resistance of the motor are studied, and no identification method is given for other parameters of the motor; the article "A Method Based on Adaptive Input_ Output Linearized Brushless DC Motor Parameter Identification Method", base

Method used

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  • Method for identifying parameters of brushless direct current motor

Examples

Experimental program
Comparison scheme
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Embodiment

[0025] Under specific voltage or loading conditions, start the motor in an open loop, and collect the motor bus current i when the motor enters a steady-state operating state in real time d , phase current i and motor rotation angle θ.

[0026] (1) Motor pole pair number P

[0027] Under the two-two conduction control mode of the brushless DC motor, the frequency f of the phase current i , There is a formula before the number of pole pairs P of the motor and the speed n of the motor: P=60f i / n. Collect the phase current i and the rotation angle θ of the brushless DC motor during steady-state operation, calculate the current frequency and the corresponding speed, and obtain the number of pole pairs of the motor according to the above formula. The number of motor pole pairs is an integer.

[0028] (2) Motor resistance R and motor back EMF constant K e

[0029] After the motor enters steady-state operation, the inductance of the motor does not work during the conduction pe...

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Abstract

The invention provides a method for identifying parameters of a brushless direct current motor. Phase currents and a motor rotating angle generated when the brushless direct current motor stably operates are collected to obtain a motor pole pair number, and motor resistance and the back electromotive force coefficient are obtained in an identification mode. The bus current of the brushless direct current motor generated when an open cycle operates in a full duty ratio mode to reach a steady state and the time period used by the bus current for reaching the steady state are collected to obtain the inductance of the motor, and the torque constant and the no-load friction torque of the motor are obtained in an identification mode. The motor rotating angle in the process that the motor enters the braking process from the steady state revolving speed is collected, and the rotation inertia parameters are obtained in an identification mode. The method is simple and practicable in theory, and the engineering practice is easy to achieve.

Description

technical field [0001] The invention relates to an identification method of motor parameters. Background technique [0002] The brushless DC motor system is widely used in various fields due to its outstanding advantages such as simple control, high reliability, high power density, good speed regulation performance, and large output torque. The basic parameters of the motor determine the quality of the motor control effect. , so the accuracy of motor parameter identification is closely related to the motor control performance. At present, the research results of brushless DC motor parameter identification include: the articles "Brushless DC Motor Torque Observation and Inductance Adaptive Identification" and "Brushless DC Motor Back EMF Adaptive Sliding Mode Observation" published in "Chinese Journal of Electrical Engineering" 》is to study the identification of motor inductance and resistance parameters on the basis of Lyapunov function and adaptive sliding mode observer re...

Claims

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Application Information

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IPC IPC(8): H02P6/00
Inventor 袁国珍齐蓉白文伟张庆超
Owner NORTHWESTERN POLYTECHNICAL UNIV
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