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Dual-redundancy control method and system of brushless motor

A control method, brushless motor technology, applied in control systems, electronic commutation motor control, single motor speed/torque control, etc. judgment, the effect of improving reliability

Inactive Publication Date: 2015-06-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two designs can improve the reliability of the motor, but require major changes to the existing motor structure, and at the same time increase the volume and weight of the motor, which contradicts the lightweight design

Method used

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  • Dual-redundancy control method and system of brushless motor
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  • Dual-redundancy control method and system of brushless motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The dual redundancy control system of the brushless motor in this embodiment is as follows figure 1 As shown, the Hall signal module and the back-EMF zero-crossing detection module obtain the motor phase, and use the three-phase brushless DC motor drive module to realize the commutation control of the motor. When the Hall position sensor is working normally, the system uses the Hall sensor position signal to control the motor commutation; when the Hall signal is abnormal, the system can immediately find and replace it with the back EMF position signal to ensure that it continues to operate and improve the motor performance. reliability.

[0058] For the above-mentioned detection of the zero-crossing point of the back-EMF, the terminal voltage method of constructing a simulated neutral point can be used to detect the zero-crossing point of the back-EMF. figure 2 The terminal voltage method is based on the principle of the back EMF detection circuit. The terminal voltag...

Embodiment 2

[0068] Since the sensor signal may be disturbed and deviated during the operation of the motor, this does not mean that the sensor is faulty. If it is just a simple threshold judgment, misjudgment is likely to occur.

[0069] Therefore on the basis of embodiment 1, carry out further improvement:

[0070] (1) Monitor in real time whether the position signal output by the position sensor exceeds the predetermined threshold; if it does not exceed the predetermined threshold, the position signal output by the position sensor is used for output;

[0071] (2) If the predetermined threshold is exceeded, timing;

[0072] (3) Monitoring, within a predetermined time, whether the position signal output by the position sensor continues to exceed the predetermined threshold;

[0073] (4) if exceeding the predetermined time, the position signal output by the position sensor still continues to exceed the predetermined threshold value, then adopt the position signal calculated by the control...

Embodiment 3

[0076] In order to ensure the accuracy and stability of fault judgment, a set of fault confirmation mechanisms must be adopted on the basis of Example 2, such as Figure 8 shown. The entire fault confirmation mechanism is divided into four states: intact, quasi-failure, final failure, and quasi-good.

[0077] When a fault is reported by the system, the timing of the fault acknowledgement time will start, and the fault will be regarded as a quasi-fault. When the fault confirmation timer exceeds the set fault confirmation time, the fault is regarded as the final fault.

[0078] During this process, if the fault confirmation timer has not exceeded the set fault confirmation time, but the fault phenomenon has disappeared, the fault state will transition from quasi-fault to intact. In the same way, for a confirmed final fault, when the system no longer detects the fault phenomenon, if the fault integrity timer exceeds the set integrity confirmation time, the fault state at this t...

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Abstract

The invention discloses a dual-redundancy control method and system of a brushless motor. A Hall position sensor position signal and a Hall position sensorless position detection signal of the motor are fused to achieve reversing control cover the motor, and the reliability of the motor is improved. Different from the existing dual-redundancy motor technology, the dual-redundancy control method and system achieve dual redundancy of the motor only in an electronic control mode without changing an original motor mechanism. The method can improve the reliability of the motor and meanwhile cannot increase the weight of the motor or change the motor structure, so the requirements for high reliability, light weight and lower cost of the motor in the aviation field can be well met.

Description

technical field [0001] The invention relates to a dual redundancy control system and method of a brushless motor. Background technique [0002] With the advancement of electronic technology and engine technology, multi-electric aero-engines have become the direction of future development. As an indispensable and important accessory equipment of aero-engine: motor, it must meet the requirements of light weight and high reliability. [0003] In order to improve the reliability of motors used in the aviation field, brushless DC motors are generally used, and brushless DC motors are divided into two types: with position sensors and without position sensors. Among them, the position sensor brushless DC motor has simple commutation control, but because the installation of the position sensor will increase the size of the motor, in the high frequency vibration and high temperature environment of the engine, the position sensor is prone to failure and reduces the reliability of the...

Claims

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Application Information

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IPC IPC(8): H02P6/08H02P6/16H02P6/18
CPCH02P6/00H02P6/16H02P6/182
Inventor 周明卜建国吕凯雄李雨宽兰旭东徐全勇黄旭东
Owner TSINGHUA UNIV
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