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Method for simulating continuous speed regulation of DC brushless motor

A technology of brushless DC motor and stepless speed regulation, which is applied in the direction of speed/torque control of a single motor, and can solve problems such as inconsistent speed of DC brushless motors with voltage

Active Publication Date: 2008-01-02
BYD CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to propose a DC brushless motor for the defect that the voltage in the linear region of the MOSEFT tube is too sensitive in the existing speed regulation method, which causes the speed of the DC brushless motor to be obviously inconsistent in different environments and occasions. The analog stepless speed regulation method

Method used

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  • Method for simulating continuous speed regulation of DC brushless motor

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Embodiment Construction

[0061] A simulation stepless speed regulation method of DC brushless motor for BYD F3 automobile blower

[0062] The DC brushless motor used is powered by the car battery with a rated current of 15A and a rated voltage of 12V. The analog stepless speed regulation method has the following steps in sequence:

[0063] (1) Initialization

[0064] When starting up, limit the PWM adjustment output of the CPU processing part to 0, initialize the PWM output of the CPU processing part, and set the motor speed R quantized into at least two gears by the external frequency signal input part a , and the motor speed R of each gear a Corresponding reference value of the voltage difference across the motor ΔV refa :

[0065] For the sake of brevity, in this specific embodiment, the motor speed is quantified into six gears, from the 0th gear to the 5th gear, the motor in the 0th gear is not rotating, and the speed R 0 =0r / min, motor speed R in the 5th gear 5 =2950r / min, the frequency dat...

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Abstract

An analogue stepless speed modulation method of direct-current non-brush motor comprises that (1), initialization, (2), judging external input shift, (3), checking the voltage difference at two ends of a motor, (4), adjusting PWM output, (5), comparing the voltage difference at two ends of the motor with the external input voltage difference reference value at two ends, until the voltage different is adjusted to demand. The invention quantizes the rotation speed of motor, tests the motor rotation speed of preset shift and the voltage difference at two ends of the motor, to reduce the change step of rotation speed of the motor. And engaged with the sequential analogue-digit converter, the invention can effectively resolve the defects of prior speed modulation method which will cause rotation speed different at different conditions of the direct-current non-brush motor, with strong stepless speed modulation uniformity and low cost. The invention can be used for stepless speed modulation of direct-current non-brush motor used b various aerators, cooling fans and heat radiation fans.

Description

technical field [0001] The invention relates to the speed regulation of a motor, in particular to an analog stepless speed regulation method of a DC brushless motor. Background technique [0002] The stepless speed regulation of the existing DC brushless motor is realized by using a single-chip microcomputer to detect the instantaneous position and speed of the rotor, and controlling the gate conduction voltage change of the MOSFET tube, which is the so-called voltage-controlled speed regulation method. The essence of this speed regulation method is to control the speed of the brushless DC motor by changing the impedance of the MOSFET in the linear region. This is a linear region that is very sensitive to voltage. Once a certain circuit parameter changes, the impedance of the MOSFET will follow. Changes, the speed of the motor will also change, especially the conduction current of the MOSFET tube will change after heating, which will cause the speed of the brushless DC motor...

Claims

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Application Information

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IPC IPC(8): H02P6/06H02P6/08
Inventor 兰艺零廖国新
Owner BYD CO LTD
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