Method and device for controlling the speed of a motor

A technology of motor speed and control method, applied in the direction of motor control, motor generator control, control of electromechanical transmission devices, etc., can solve problems affecting motor performance, motor speed fluctuation, etc., and achieve the effect of stable motor operation and meeting noise requirements.

Active Publication Date: 2018-01-23
GREE ELECTRIC APPLIANCES INC +1
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the technical solution disclosed in this application document is very prone to speed fluctuations in the motor under light load or no load, which affects the performance of the motor.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and device for controlling the speed of a motor
  • Method and device for controlling the speed of a motor
  • Method and device for controlling the speed of a motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] figure 1 It is a flowchart of a motor speed control method provided by Embodiment 1 of the present invention. This embodiment is applicable to the situation where the motor automatically adjusts the speed when the external wind pressure changes. This method can be executed by the motor speed control device. Specifically include the following steps:

[0023] Step 110, obtaining the current rotation speed of the motor, and determining a current loop reference value according to the current rotation speed and the set maximum rotation speed.

[0024] Among them, the motor speed is the angular velocity of the motor rotor. The current rotational speed is the angular velocity of the motor rotor at the sampling moment. Preferably, acquiring the current rotational speed of the motor includes acquiring a current angle of the motor rotor, and determining the current rotational speed according to the current angle. The interval of the rotor and the corresponding angle during the...

Embodiment 2

[0032] Figure 2a It is a flow chart of the rotation speed protection step in the motor rotation speed control method in the second embodiment of the present invention. On the basis of the above-mentioned embodiments, the technical solution of this embodiment further defines the method of determining the reference value of the current loop according to the current speed and the set maximum speed, which specifically includes the following steps:

[0033] Step 210, acquiring the current rotational speed of the motor.

[0034]Fix the Hall sensor on the silicon steel sheet of the stator core and electrically connect it with the motor controller. The motor controller can determine the interval of the rotor and the corresponding angle during the operation of the motor through the Hall sensor, so as to obtain an ideal electrical angle at the Hall position. For example, the motor controller determines through the Hall sensor that the rotor is currently in the range of 60°-120°, and ...

Embodiment 3

[0047] Figure 3a It is a flow chart of the rotation speed protection step in the motor rotation speed control method in the third embodiment of the present invention. On the basis of the above-mentioned embodiments, the technical solution of this embodiment further defines the determination of the current loop reference value according to the current speed and the set maximum speed, which specifically includes the following steps:

[0048] Step 310, acquiring the current rotational speed of the motor.

[0049] The interval of the rotor and the corresponding angle during the operation of the motor can be determined through the Hall sensor, so as to obtain an ideal electrical angle at the Hall position. The specific calculation process is the same as the above embodiment, and will not be repeated here.

[0050] Step 320 , judging whether the current rotation speed is greater than the set maximum rotation speed, if yes, execute step 330 , if not, execute step 310 .

[0051] T...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method and device for controlling motor rotation speed. The method comprises the steps of obtaining the current rotation speed of a motor, determining current loop reference value according to the current rotation speed and a set maximum rotation speed, obtaining a three-phase current of the motor, performing proportion-integral calculation according to the three-phase current and the current loop reference value to obtain a current loop output value, and determining motor driving signals for controlling the motor rotation speed according to the current loop output value. According to the method and device, the adjustment of the motor rotation speed of an intelligent appliance having air volume requirements, such as a kitchen ventilator is achieved, and the effect that the load is changed when outside air pressure changes and the motor rotation speed is adjusted automatically to meet the requirements of the air volume is achieved. According to the method and the device, when the outside air pressure changes, the motor rotation speed is stabilized at a maximum rotation speed, the function of meeting the noise requirements is achieved, and the effect of stable operation of the motor under the conditions of idle load or light load is achieved.

Description

technical field [0001] Embodiments of the present invention relate to automatic control technology, and in particular to a method and device for controlling the rotational speed of a motor. Background technique [0002] With the continuous development of society, people pay more and more attention to the energy-saving and environmental protection performance and intelligent performance of electrical appliances. In order to ensure that smart appliances meet the requirements of stable operation, energy saving, environmental protection, and low noise, designers have made a lot of efforts. [0003] At present, many designers improve smart appliances from the aspects of indoor air quality, energy saving, environmental protection and intelligence. For example, the application document with patent application number 201410143579.7 discloses a method and system for controlling constant air volume and noise reduction of range hoods. The scheme of the application document discloses ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/22
CPCH02P2205/01
Inventor 赵瑞平李立孙家广黄志飞
Owner GREE ELECTRIC APPLIANCES INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap