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Position-free control system for compensating back electromotive force constant of brushless direct-current motor

A back electromotive force constant and back electromotive force technology, which is applied in the field of positionless control for compensating the back electromotive force constant of brushless DC motors, can solve problems such as reducing the performance of sensorless control algorithms, reduce torque ripple, improve accuracy, and improve The effect of robustness

Inactive Publication Date: 2019-12-20
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The back electromotive force detection method needs to establish a mathematical model of the brushless DC motor, and estimate the back electromotive force based on a simple DC current model. Since there is a large error between the actual measured current and the model current in each commutation cycle, this Errors affect rotor speed and position estimates and degrade sensorless control algorithm performance in all speed ranges

Method used

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  • Position-free control system for compensating back electromotive force constant of brushless direct-current motor
  • Position-free control system for compensating back electromotive force constant of brushless direct-current motor
  • Position-free control system for compensating back electromotive force constant of brushless direct-current motor

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Embodiment 1

[0105] In the embodiment, the parameters of the three-phase brushless DC motor are shown in the table below.

[0106]

[0107] In this embodiment, the rated speed is set to 2000 RPM, the load torque is set to 0.1 N·m, and the sampling period and switching frequency are set to 10 kHz.

[0108] image 3 is the rotating speed and position waveform of the rotor (the new detection algorithm, the back EMF constant is unchanged), under this test condition, the back EMF algorithm adopts the new detection algorithm combining the voltage equation and the mechanical equation shown in formula (14), the back EMF The constant remains unchanged, and the back electromotive force constant compensation module is not introduced. image 3 (a) shows the rotational speed waveform, image 3 (b) and (c) show the waveforms of the estimated position of the rotor and the actual position. It can be seen that the difference is small, and the algorithm is verified.

[0109] Figure 4 is the rotor sp...

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Abstract

The invention provides a position-free control system for compensating a back electromotive force constant of a brushless direct-current motor. The position-free control system comprises a speed PI controller, a current PI controller, a position vector controller, a rotor current detection module, a position error detection module, a back electromotive force calculation module and a back electromotive force constant compensation module. According to the system, a stator voltage equation is combined with a rotor mechanical equation, so that the estimation of back electromotive force is more accurate.

Description

technical field [0001] The invention relates to a motor control technology, in particular to a positionless control method for compensating the counter electromotive force constant of a brushless DC motor. Background technique [0002] Brushless DC motor BLDCM (BrushlessDCMotor) consists of a DC motor and its driver, and is a typical mechatronic product. Because it uses a transistor commutation circuit to replace the traditional mechanical commutation structure composed of brushes and commutators, it is also called an electronic commutation DC motor. [0003] Brushless DC motor has many advantages such as good speed regulation performance, simple control, high power density and high efficiency, and has been widely used in many fields. Such as electric vehicles, electric bicycles, car air conditioners, wipers, etc. in the automotive industry; air-conditioning compressors, inverter washing machines, etc. in the home appliance field; gyroscopes, robotic arms, etc. in aerospace...

Claims

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Application Information

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IPC IPC(8): H02P6/182H02P21/18
CPCH02P6/182H02P21/18
Inventor 杨涛孙瑜汪凯鑫庄纪岩袁贤
Owner NANJING UNIV OF SCI & TECH
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