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Method and device for controlling motor rotation speed

A technology of motor speed and control method, which is used in motor control, motor generator control, control of electromechanical transmission devices, etc., can solve problems such as motor speed fluctuation and affect motor performance, and achieve the effect of meeting noise requirements and stable motor operation.

Active Publication Date: 2016-04-20
GREE ELECTRIC APPLIANCES INC +1
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  • 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

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  • Method and device for controlling motor rotation speed
  • Method and device for controlling motor rotation speed
  • Method and device for controlling motor rotation speed

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] figure 1 This is a flowchart of a method for controlling the speed of a motor provided by the first embodiment of the present invention. This embodiment can be applied to the situation where the motor automatically adjusts the speed when the external wind pressure changes. The method can be executed by the motor speed control device. It includes the following steps:

[0023] Step 110: Obtain the current speed of the motor, and determine the current loop reference value according to the current speed and the set maximum speed.

[0024] Among them, the motor speed is the angular speed of the motor rotor. The current speed is the angular speed of the motor rotor at the sampling time. Preferably, acquiring the current rotation speed of the motor includes acquiring the current angle of the motor rotor, and determining the current rotation speed according to the current angle. The hall sensor can be used to detect the interval and the corresponding angle of the rotor during the ...

Embodiment 2

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

[0033] Step 210: Obtain the current speed of the motor.

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

Embodiment 3

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

[0048] Step 310: Obtain the current speed of the motor.

[0049] The Hall sensor can determine the interval and the corresponding angle of the rotor during the operation of the motor, so as to obtain the 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: Determine whether the current rotation speed is greater than the set maximum rotation speed, if yes, perform step 330, and if not, perform step 310.

[0051] The motor controller compares the current s...

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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] The embodiment of the present invention relates to automatic control technology, in particular to a method and device for controlling the 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 start with indoor air quality, energy saving, environmental protection, and intelligence to improve smart appliances. For example, the application document with the patent application number 201410143579.7 discloses a method and system for reducing noise with constant air volume of a range hood. The proposal of the application document discloses that by judging whether the c...

Claims

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Application Information

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Patent Type & Authority Applications(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
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