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High-rotating speed brushless DC motor position-sensor-free control method

A technology of brushed DC motor and control method, which is applied in the direction of electronically commutated motor control, control system, electrical components, etc., and can solve the problems of inability to start the motor well and out of phase

Active Publication Date: 2019-06-07
SUZHOU ZHIYING ELECTRONICS TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, the back EMF amplitude after low-pass filtering is too low when the motor is at low speed, and a small parameter difference may cause phase loss, and the motor cannot be started well at low speed (especially at high load). At the same time, the low-pass filter will bring phase shift, and it is necessary to calculate the filtered phase shift angle to compensate, and high-end MCU or DSP processing is required to obtain better results.

Method used

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Embodiment Construction

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0022] see Figure 1-7 , the present invention provides a technical solution: a method for controlling a high-speed brushless DC motor without a position sensor, including the starting and running of the motor. The starting and running of the motor are respectively: motor positioning, motor starting, low-speed running, High-speed operation; during the operation of the motor, the motor positioning and start-up process runs once, and the low-speed and high-speed...

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Abstract

The invention discloses a high-rotating speed brushless DC motor position-sensor-free control method. The method comprises the starting and running of a motor; the running starting of the motor is includes motor positioning, motor starting, low-speed running and high-speed running; in the operation process of the motor, each of the motor positioning flow and the motor starting flow runs once, thelow-speed flow and the high-speed flow repeatedly run according to the speed setting. The entire control method is simple, capable of saving energy and greatly improving the working efficiency of themotor, and worthy of popularization.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a position sensorless control method for a brushless DC motor with high electrical speed. Background technique [0002] With the development of semiconductor technology and motor control technology, brushless DC motors have become more and more widely used due to their advantages such as high efficiency, high torque and long life. At the same time, the brushless DC motor must have the permanent magnet rotor position signal to be able to commutate correctly and operate reliably, so it puts forward higher requirements for the correct detection of the rotor position. The application of position sensorless control technology can avoid many problems of installing sensors, and can also be applied to some motor applications that are not suitable for installing position sensors. [0003] At present, the application of the sensorless control mode of the brushless DC motor is becomi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/182
Inventor 祁宏
Owner SUZHOU ZHIYING ELECTRONICS TECH