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Drive system and drive method of DC brushless motor without Hall element

A brushless DC, motor-driven technology, used in control systems, electrical components, electronic commutation motor control, etc., can solve the problem of inability to detect the initial position of the motor rotor, and achieve the effect of optimal system stability and increased accuracy.

Active Publication Date: 2016-08-24
AMTEK SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage is that the induced back electromotive force does not exist when the motor is stationary, making it impossible to detect the initial position of the motor rotor

Method used

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  • Drive system and drive method of DC brushless motor without Hall element
  • Drive system and drive method of DC brushless motor without Hall element
  • Drive system and drive method of DC brushless motor without Hall element

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Embodiment Construction

[0020] First, see figure 1 , is a block diagram of the DC brushless motor drive system without Hall element of the present invention. Such as figure 1 As shown, the DC brushless motor drive system without Hall elements includes: a rotor detection circuit 10, one end of which is connected to an adjustment capacitor (C adj ) 101 connection; a logic control circuit 20, one end of which is connected with the rotor detection circuit 10, and generates a corresponding three-phase output drive signal (M) according to the output signal of the rotor detection circuit 10 u , M v , M w ); a load drive circuit 30, one end of which is connected with the three-phase output drive signal of the logic control circuit 20, and produces a three-phase output voltage (V u , V v , V w ) and an output current (I L ), used to drive the three-phase brushless DC motor 40 to rotate, and the other end of the load drive circuit 30 is connected to a sense resistor (R sense ) 301 for generating a sens...

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Abstract

A drive system and drive method for a DC brushless motor without a Hall element, which is composed of a rotor detection circuit, a logic control circuit, a load drive circuit, a counter electromotive force detection circuit, a speed parameter generation circuit, and a feedback comparison circuit. Among them, an adjustable capacitor is added to the rotor detection circuit to increase the accuracy of detecting the rotor position, and an adjustable resistor is added to the speed parameter generation circuit to change the current level of the first step when starting to ensure the smooth start of the motor, thereby achieving good performance. Excellent motor starting output performance and better system stability.

Description

technical field [0001] The present invention relates to a driving system and a driving method of a DC brushless motor, in particular to a driving system and a driving method of a DC motor without a Hall element, so that the DC motor without a Hall element of the present invention can The drive system can achieve good start-up output performance and linearized motor speed control; by adding an adjustable capacitor to the rotor detection circuit of the drive system to change the length of detection time to increase the accuracy of rotor position detection, And it is also possible to add an adjustable resistor to the speed parameter generation circuit of the drive system to change the current at start-up to ensure the smooth start of the motor; so that the drive system and drive method of the brushless DC motor of the present invention can be used On a Blu-ray drive, regular optical drive, or fan. Background technique [0002] Generally speaking, in order to drive a brushless ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/08H02P6/182
Inventor 李灯辉陈威志刘锦鸿吴耿毅
Owner AMTEK SEMICON