A brushless DC motor speed control device and speed control method

A brushed DC motor and speed regulating device technology, applied in excitation or armature current control, torque ripple control, etc., can solve the problems of motor torque ripple, low reliability, high cost, etc.

Active Publication Date: 2017-07-14
SUZHOU KEAIJIA AUTOMATION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a brushless DC motor speed control device and speed control method, which can solve the problems of high cost and low reliability of current phase current sampling and motor torque ripple of DC bus sampling.

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  • A brushless DC motor speed control device and speed control method
  • A brushless DC motor speed control device and speed control method
  • A brushless DC motor speed control device and speed control method

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Embodiment Construction

[0023] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] The invention provides a brushless DC motor speed regulating device, which is used to control the speed of the brushless DC motor. figure 1 As shown, the brushless DC motor circuit includes a DC power supply, bus resistance R S , three-phase bridge inverter and DC motor, wherein the positive pole of the DC power supply is connected to one input terminal of the three-phase bridge inverter, and the negative pole of the DC power supply is connected to the other input terminal of the three-phase bridge inverter via a bus resistor terminal, and the three output terminals of the three-phase bridge inverter are correspondingly connected with the three-phase windings of the brushless DC motor.

[0025] like figure 2 As shown, the speed regulating device includes a PWM controller, a current sampling module and a current regulator. Under th...

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Abstract

The invention discloses a brush-less direct current motor speed regulating method and a speed regulating device using the same. The brush-less direct current motor speed regulating method includes steps that capturing PWM waveform output from a comparison module; connecting the PWM waveform with an interrupt signal, entering interrupt immediately when a high level is detected in the PWM waveform, and enabling a current sampling module to immediately sample the current which flows through a bus resistor; sending the sampled current to a current regulator, and enabling the current regulator to output a duty ratio according to a preset current and the sampled current; using the duty ratio to control the on and off of a bridge power tube in a three-phase bridge type inverter, and controlling the effective voltage exerted to the brush-less direct current motor to regulate the rotating speed thereof. The brush-less direct current motor speed regulating method is capable of solving the problems of high cost and low reliability of the existing phase current sampling, the motor torque pulsation of the direct current bus sampling and the like.

Description

technical field [0001] The invention belongs to the field of speed control of brushless direct current motors, in particular to a brushless direct current motor speed regulating device and speed regulating method based on direct current bus current sampling. Background technique [0002] Brushless DC motor speed control system is a new type of speed control system. Its speed and current double closed-loop digital control system can be divided into hysteresis control and PI control according to different current control strategies. The current hysteresis control makes the motor work in the conduction mode. By comparing the given current value with the feedback current value in real time, the power tube is controlled to be turned on or off within one cycle to realize the regulation of the current. The current PI control makes the motor work in the 120° conduction mode, and the current regulator generates an appropriate duty cycle, and according to the position of the permanent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/10
CPCH02P6/10H02P7/28
Inventor 储建华高霞张懿魏海峰
Owner SUZHOU KEAIJIA AUTOMATION TECH CO LTD
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