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Brushless direct current motor power inverter power-on self-test device and self-test method

A power inverter, brushed DC motor technology, applied in emergency protection circuit devices, measuring devices, measuring electrical variables, etc. strong effect

Active Publication Date: 2015-07-08
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Short-circuit faults and open-circuit faults show different fault phenomena due to the number and location of the faulty power tubes, which brings great difficulties to power-on self-test

Method used

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  • Brushless direct current motor power inverter power-on self-test device and self-test method
  • Brushless direct current motor power inverter power-on self-test device and self-test method
  • Brushless direct current motor power inverter power-on self-test device and self-test method

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Experimental program
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specific Embodiment

[0050] Specific embodiments: the system used in the experiment is a three-phase six-state brushless DC motor control system, the DSP used is TMS320F2808 of TI Company, the chopping frequency is 25KHz, and the chopping mode is chopping up and down without chopping. figure 2 The terminal voltage detection signals UA, UB, and UC are sent to the AD0, AD1, and AD2 ports of the DSP for detection, and the AD sampling mode is set to sample at the middle of the duty. The power-on self-test algorithm of the power inverter is realized by DSP programming, and the program flow chart is shown in Figure 4 , which will be described in detail below with examples.

[0051] (1) Initialization

[0052] Set the duty cycle for detection, and TestDuty is _IQ(0.05); set the sampling trigger event of the AD module to the sampling mode at the middle of the duty cycle; clear all power inverter-related fault flags to 0.

[0053] (2) Turn off all power tubes of the power inverter

[0054] (3) Read th...

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Abstract

The invention relates to a brushless direct current motor power inverter power-on self-test device and a self-test method. The brushless direct current motor power inverter power-on self-test device comprises three bridge arms consisting of six power tubes V1, V2, V3, V4, V5 and V6 and is characterized in that a resistor R1 is in parallel connection with the power tube V1 and then is grounded through a serial connection circuit of an R4 and an R7, a resistor R2 is in parallel connection with the power tube V3 and then is grounded through a serial connection circuit of an R5 and an R8, and a resistor R3 is in parallel connection with the power tube V5 and then is grounded through a serial connection circuit of an R6 and an R9. By means of the self-test device and the self-test method, state information of an inverter can be obtained before a motor operates. The faults of the power inverter of a brushless direct current motor are mainly classified into open-circuit faults and short-circuit faults of the power tubes, and power-on self testing is conducted on the inverter by adopting the self-test method and combining a fault detection circuit and control software.

Description

technical field [0001] The invention belongs to a brushless DC motor control system, and relates to a power-on self-inspection device and a self-inspection method for a brushless DC motor power inverter. Background technique [0002] Brushless DC motor (BLDCM) not only has a series of advantages such as simple structure, reliable operation and convenient maintenance of AC motor, but also has the characteristics of high operating efficiency, good speed regulation performance and large starting torque of DC motor. Aerospace, home appliances, transportation and many other fields have been widely used. [0003] The basic composition of the brushless DC motor includes three parts: the motor body, the electronic commutation circuit and the rotor position sensor. The motor body is mainly composed of a stator and a rotor. The electronic commutation circuit generally consists of a drive part and a control part. Rotor position sensing is a device used to detect the position of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/08G01R31/02H02H7/122
Inventor 马瑞卿刘青韩伟健
Owner NORTHWESTERN POLYTECHNICAL UNIV
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