A Fault Tolerant Drive Control Method for Brushless DC Motor

A brush DC motor, drive control technology, applied in the direction of motor control, control system, electrical components, etc., can solve the problems of complex structure and control, high cost, complex structure, etc.

Active Publication Date: 2021-09-14
BEIJING AUTOMATION CONTROL EQUIP INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For open circuit faults, the current research is more on the three-phase four-switch fault-tolerant inverter and the double-winding brushless DC motor, but the research on the three-phase four-switch fault-tolerant inverter usually focuses on the fault on the inverter side and its fault-tolerant control , the structure and control are complex, and the double-winding brushless DC motor has stronger fault tolerance, but it needs a specially designed motor and two six-switch drivers. The structure is complex and the cost is high, which is limited in actual system applications

Method used

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  • A Fault Tolerant Drive Control Method for Brushless DC Motor
  • A Fault Tolerant Drive Control Method for Brushless DC Motor
  • A Fault Tolerant Drive Control Method for Brushless DC Motor

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Embodiment Construction

[0029] The present invention will be further described below by means of the accompanying drawings and specific embodiments.

[0030] Such as figure 1 As shown, the commonly used brushless DC motor three-phase bridge drive circuit.

[0031] The three-phase bridge drive circuit consists of three half-bridges connected in parallel, and each half-bridge is formed by two MOSFETs (metal-oxide semiconductor field-effect transistors) or two IGBTs (insulated gate bipolar transistors) in series.

[0032] T1~T6 are MOSFET or IGBT;

[0033] T1 and T2 form a half-bridge, T1 is positively connected to the power supply, T2 is connected to the power ground, and the connection between T1 and T2 is point A, which is the output end of the half-bridge. T3 and T4 form a half-bridge, T3 is positively connected to the power supply, T4 is connected to the power supply ground, and the connection between T3 and T4 is point B, which is the output end of the half-bridge. T5 and T6 form a half-bridge, ...

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Abstract

The invention belongs to the technical field of motion control, and specifically relates to a fault-tolerant brushless DC motor drive control method, which uses a three-phase bridge drive circuit to build a fault-tolerant drive control system and then performs fault-tolerant control, including determining the switching tube and the motor to be turned on On the basis of the three-phase bridge drive circuit of the brushless DC motor, add a half bridge to lead out the star connection point of the three-phase brushless DC motor, and connect the lead wires with the added One half-bridge output terminal is connected to realize the fault-tolerant control of the brushless motor under the condition of small change compared with the original system. That is, by adding redundant configuration, when one phase of the motor fails or one phase of the drive fails, only the remaining two phases of the motor are used to achieve fault-tolerant operation under fault conditions.

Description

technical field [0001] The invention belongs to the technical field of motion control, and in particular relates to a control method of a brushless DC motor. Background technique [0002] Permanent magnet brushless DC motor has been widely used in the field of motion control due to its advantages of high power density, high reliability, and simple control. Most commonly used brushless DC motors use three-phase star-connected armature windings and two-two conduction. The controller determines the sector where the rotor is located by collecting Hall sensor signals, and controls the drive circuit to energize the three-phase windings to drive the motor to rotate. . Therefore, if one-phase winding of the motor is disconnected, the drive side is faulty, or one-phase connection between the motor and the drive is disconnected, there will be no torque output in the corresponding sector, and the motor will not work normally. Therefore, it is of great significance to study the fault-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P29/028H02P29/024
CPCH02P29/028H02P29/0243
Inventor 王帅熊官送曹东海
Owner BEIJING AUTOMATION CONTROL EQUIP INST
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