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Brushless Hallless motor drive circuit and control method

A technology of motor drive circuit and control method, which is applied in the direction of single motor speed/torque control, electronic commutator, starting device, etc., can solve the problems that the drive device cannot adapt to high temperature or humid environment, and the cost of the whole machine is high, and achieve Improve reliability and stability, save hardware costs, and run stably

Active Publication Date: 2020-06-16
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the drive device in the prior art that it cannot adapt to high temperature or humid environment and the cost of the whole machine is relatively high, and to provide a brushless and driveless motor with simple structure, more precise control and faster acceleration. Er motor drive circuit and control method

Method used

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  • Brushless Hallless motor drive circuit and control method
  • Brushless Hallless motor drive circuit and control method
  • Brushless Hallless motor drive circuit and control method

Examples

Experimental program
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Effect test

Embodiment 1

[0061] Such as figure 1 , figure 2 The illustrated embodiment is a brushless Hallless motor drive circuit, including a single-chip microcomputer 1, a memory 7, an alarm 8, a display 9, two buttons 2, and a three-phase circuit 3 connected to the brushless motor 10, The current detection circuit 4 electrically connected with the three-phase circuit, the counter electromotive force detection circuit 6 connected with the motor internal circuit 5; the single chip microcomputer, the three-phase circuit and the motor internal circuit are electrically connected in turn, the output terminal of the counter electromotive force detection circuit, the current detection circuit The output terminal, memory, display, alarm and 2 buttons are all electrically connected with the single-chip electromechanical device.

[0062] Such as figure 1 As shown, the current detection circuit includes a resistor R9, a resistor R10, a resistor R11, a resistor R12, a capacitor C2 and a capacitor C3, and an...

Embodiment 2

[0096] Embodiment 2 includes all the structures and steps of Embodiment 1, and Embodiment 2 also includes the following motor stall detection steps:

[0097] During the stable operation of the motor, the single-chip microcomputer reads the time b of 7 consecutive commutations every time T 11 , b 12 ...,b 17 , using the formula t′=b 17 -b 11 Calculate the current period t', when t'>t 0 , then the single-chip microcomputer controls the output PWM variable acceleration wave; repeat step 300, and use the commutation angle α to control the motor to accelerate;

[0098] when t′≥t 0 , the single-chip microcomputer controls to output PWM stable waves; repeat step 300, and use the commutation angle α to control the stable operation of the motor.

[0099] Step 200 also includes the following step of detecting too small torque:

[0100] Torque threshold I2 is set in the memory, I2

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Abstract

The invention discloses a brushless non-hall motor driving circuit and a control method. The brushless non-hall motor driving circuit comprises a single chip microprocessor, a storage, an alarm apparatus, a display, two keys, a three-phase circuit connected with the motor, a current detection circuit electrically connected with the three-phase circuit, and a counter electromotive force detection circuit connected with an internal circuit of the motor; the single chip microcomputer, the three-phase circuit and the internal circuit of the motor are electrically connected in sequence; and the output end of the counter electromotive force detection circuit, the storage, the display, the alarm apparatus and the two keys are all electrically connected with the single chip microcomputer. The brushless non-hall motor driving circuit has the characteristics that the running faults of the motor can be automatically detected and judged, and part of the faults without hardware-damage can be automatically restored; when the faults cannot be restored, the machine halt is performed and an operator is informed of the fault information in time; and in addition, the reliable control of the motor is ensured, and the service life of the motor is prolonged.

Description

technical field [0001] The invention relates to the technical field of brushless motor control, in particular to a drive circuit and a control method for a brushless Hallless motor with simple structure, more precise control and faster acceleration. Background technique [0002] With the "small, light and thin" audio-visual products, the quietness of home appliances and the increasing demand for luxury cars, the demand for brushless DC motors has increased rapidly. Brushless DC motors replace brushes and commutators with electronic commutation, and have the advantages of high reliability, high efficiency, long life, and convenient speed regulation. [0003] The brushless motor with Hall sensor has the disadvantages that the Hall sensor is easily damaged, the number of wiring is large, it cannot adapt to high temperature or humid environment, and the cost of the whole machine is high. [0004] Chinese patent authorization publication number: CN203675019U, authorized publicat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/08H02P6/18H02P6/20
Inventor 张华田兴元
Owner ZHEJIANG OCEAN UNIV
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