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Sensorless brushless DC motor commutation deviation fast correction control system

A brushed DC motor, correction control technology, applied in the control system, motor control, electronic commutation motor control, etc., can solve the problems of non-conductive phase diode freewheeling, motor braking, motor torque ripple increase, etc.

Active Publication Date: 2017-05-10
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the influence of low-pass filtering, armature reaction and device delay, the commutation signal generated by the back EMF zero-crossing detection method will inevitably be accompanied by commutation deviation
Inaccurate commutation signals will increase the torque ripple of the motor, cause non-conductive phase diode freewheeling at high speed, generate negative electromagnetic torque, and even cause the motor to brake, seriously reducing the efficiency of the motor

Method used

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  • Sensorless brushless DC motor commutation deviation fast correction control system
  • Sensorless brushless DC motor commutation deviation fast correction control system
  • Sensorless brushless DC motor commutation deviation fast correction control system

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Embodiment Construction

[0052] attached figure 1 The commutation deviation correction control system for the sensorless brushless DC motor designed for the present invention includes a motor drive system (1), a brushless DC motor (2), a signal drive circuit (3), and a back EMF position detection circuit (4 ), a current detection circuit (5), a temperature detection circuit (6) and a digital controller (7).

[0053] The three-phase inverter bridge in the motor drive system (1) receives the drive signal from the drive circuit (3) to control the switching device on and off, and the output of the three-phase inverter bridge is directly connected to the three-phase winding of the brushless DC motor (2), The back EMF position detection circuit (4) collects the terminal voltage of the three-phase winding of the brushless DC motor (2), the current detection circuit (5) measures the bus current through a precision non-inductive sampling resistor, and the temperature detection circuit (6) is installed in the ...

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Abstract

The invention relates to a sensorless brushless DC motor commutation deviation fast correction control system and a method. An analytical equation between the bus current difference before and after commutation and commutation deviation is derived according to the bus current fluctuation value before and after commutation. In view of the influence of commutation ripple and motor three-phase winding asymmetry on the accuracy of sampled current during actual bus current sampling, a method for current offset sampling in the same conduction zone is designed. The bus current difference is obtained according to the designed current sampling method, the commutation deviation is calculated based on the analytical equation, and the commutation signal is compensated and corrected in real time. By designing the sensorless motor commutation deviation fast correction control system, the commutation deviation convergence time is reduced greatly, and the commutation precision is improved.

Description

technical field [0001] The invention relates to a fast correction control system for phase commutation deviation of a brushless DC motor without a position sensor, which is used for realizing accurate phase commutation of the brushless DC motor without a position sensor. Background technique [0002] Brushless DC motors are widely used in industry, robot industry, automobile, aerospace and military fields due to their advantages of high power density, high efficiency, high torque inertia ratio, and compact structure. Traditional brushless DC motors require position sensors to provide rotor position information to achieve accurate commutation control. However, the installation of position sensors not only increases equipment costs, but also puts forward higher requirements for the daily maintenance of the motor, and also reduces Overall system stability and reliability. Especially in some applications that require extremely high reliability, such as military and aerospace ap...

Claims

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Application Information

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IPC IPC(8): H02P6/182H02P29/60
CPCH02P6/182
Inventor 周新秀陈曦方敏
Owner BEIHANG UNIV
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