Position-sensorless control device for wide speed regulating range brushless DC motor without filter

A brushless DC motor and filter-free technology, which is applied in the direction of electronic commutation motor control, single motor speed/torque control, control system, etc., can solve the problem of limited application and popularization of brushless DC motor position sensorless control system, which is difficult to realize Accurate detection of back EMF zero-crossing point, low-speed operating range, etc., to eliminate system software and hardware overhead, expand low-speed operating range and performance, and reduce system costs

Inactive Publication Date: 2009-02-11
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The common defects of these detection methods are: due to the relatively weak amplitude of the back EMF signal during low-speed operation, coupled with the influence of PWM modulation, it is difficult to accurately detect the zero-crossing point of the back EMF, resu

Method used

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  • Position-sensorless control device for wide speed regulating range brushless DC motor without filter
  • Position-sensorless control device for wide speed regulating range brushless DC motor without filter
  • Position-sensorless control device for wide speed regulating range brushless DC motor without filter

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Embodiment Construction

[0034] Preferred embodiments of the present invention are described as follows in conjunction with the accompanying drawings: see image 3 , the non-filter wide speed range brushless DC motor position sensorless control device includes a DC power supply 1, a three-phase inverter 2, a brushless DC motor 3, a rotor position detection circuit 4, a microcontroller 8 and three Phase inverter power device drive circuit 9. The DC power supply 1 is connected to the brushless DC motor 3 through a power supply voltage adjustment unit 11 and the three-phase inverter 2; after the rotor position detection circuit 4 is connected to the brushless DC motor for detection, the output signal is directly connected to the microcontroller 8 Digital conversion input pin; one output of the microcontroller 8 is connected to the power supply voltage adjustment unit 11 through a power supply voltage adjustment unit power device drive circuit 10, and the other output is connected to the three-phase inver...

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Abstract

The invention relates to a filter-free brushless DC motor control device with wide speed regulation range and no position sensors. The filter-free brushless DC motor control device comprises a DC power supply, a three-phase inverter, a brushless DC motor, a rotor position detection circuit, a microcontroller and a three-phase inverter power device drive circuit, wherein the DC power supply is connected with the brushless DC motor through a power voltage regulating unit and the three-phase inverter; the output signal of a rotor position detection circuit connected with the brushless DC motor is directly connected with the A/D conversion input pin of the microcontroller; ant the PWM output signal of the microcontroller is connected with the power voltage adjusting unit through a power voltage adjusting unit power device drive circuit. The control device can control the rotation speed of the brushless DC motor by PWM chopping control of a power switch VT7. Six commutation control signals outputted by the microcontroller are connected with the three-phase inverter through the three-phase inverter power device drive circuit to achieve commutation control of the brushless DC motor. The filter-free brushless DC motor control device has the advantages of improved reverse potential detection accuracy of the brushless DC motor, simplified system and lowered cost.

Description

Technical field: [0001] The invention relates to a position sensorless control device for a brushless direct current motor, in particular to a position sensorless control device for a brushless direct current motor with a wide speed regulation range without a filter. Background technique: [0002] In the conventional brushless DC motor position sensorless control device, the motor rotor position signal is obtained indirectly by detecting the motor disconnected phase winding terminal voltage to obtain the motor rotor position signal, which has the characteristics of simple structure, low cost, and convenient implementation. , has been widely used in industrial practice. The structure of conventional brushless DC motor without position sensor control device is as follows: figure 1 As shown, its main circuit is as figure 2 shown, where VT 1 ~VT 6 A bridge inverter circuit 2 is formed; A, B, and C are respectively the three-phase windings 3 of the brushless DC motor. In th...

Claims

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Application Information

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IPC IPC(8): H02P6/18H02P6/08H02P6/182
Inventor 崔巍陈安辉江建中章跃进马艳丽
Owner SHANGHAI UNIV
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