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Single-cycle detection and protection method for peak current of brushless direct current motor

A brush DC motor, peak current technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems that can not truly reflect the peak current of the motor, overcurrent protection lag, protection does not burn the controller in time, etc., to achieve strong real-time performance , Improving timeliness and wide application

Active Publication Date: 2015-07-08
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

For the bus current, on the one hand, the traditional detection method cannot truly reflect the peak current of the motor;

Method used

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  • Single-cycle detection and protection method for peak current of brushless direct current motor
  • Single-cycle detection and protection method for peak current of brushless direct current motor
  • Single-cycle detection and protection method for peak current of brushless direct current motor

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Embodiment Construction

[0033] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0034] In the three-phase six-state brushless DC motor bus current detection circuit, the motor bus current passes through the power sampling resistor to convert the current value into a voltage value (see figure 1 ), and then sent to the AD port of DSP for detection after filtering and amplifying. It is especially emphasized that the filtering here only filters out the high-frequency clutter above the chopping frequency.

[0035] The control cycle of the control system software is 25uS (40KHz), the PWM chopping frequency is 25KHz, and the DSP uses TI's TMS320F2808.

[0036] The specific implementation of current sampling and protection method is according to image 3 shown in the flowchart.

[0037] Step 1: In the initialization of the system control software, record the value of the initial duty ratio: PWM_CMPA=DutyFunc; set the A-way PWM and B-way PWM to sy...

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Abstract

The invention relates to a single-cycle detection and protection method for a peak current of a brushless direct current motor. The method improves the perspectiveness of detection on the peak current of the brushless direct current motor and overcurrent protection timeliness. On the basis of a traditional bus current sampling circuit, a bus current detection circuit cooperates with an AD module of a DSP to detect the bus peak current of the motor, and the detection process comprises current detection and overcurrent protection. In each chopping cycle of current detection, AD interruption is triggered at the duty ratio of three fourths, and the current of the motor is sampled. In each control cycle, once an overcurrent fault is detected, shutdown protection is conducted, and if it is detected that the current in a next control cycle is normal again, overcurrent protection is stopped at once. The method can shorten the time from detection of the overcurrent fault of the motor to protection implementation to be within one control cycle, and is high in real-time property.

Description

technical field [0001] The invention belongs to a brushless direct current motor control system and relates to a single-period detection and protection method for the peak current of a brushless direct current motor. 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 pos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/085
Inventor 马瑞卿刘青韩伟健张庆超
Owner NORTHWESTERN POLYTECHNICAL UNIV
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