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Radiating method for variable frequency motor, and air conditioner

A heat dissipation method and frequency conversion motor technology, applied in the direction of AC motor control, electrical components, electromechanical devices, etc., can solve the problem that the heat dissipation effect of the frequency conversion motor cannot meet the actual needs, and achieve the effect of improving the heat dissipation effect.

Active Publication Date: 2016-10-12
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to provide a cooling method for variable frequency motors and an air conditioner to solve the problem that the cooling effect of variable frequency motors in the prior art cannot meet actual needs

Method used

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  • Radiating method for variable frequency motor, and air conditioner

Examples

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no. 1 example

[0036] Such as figure 1 As shown, according to one aspect of the present invention, a cooling method for a variable frequency motor is provided. According to the first embodiment provided by the present invention, the method includes determining the motor efficiency of the motor according to the frequency of the motor, determining the fan efficiency of the fan according to the frequency of the fan, and finding out when the fan efficiency is not less than the motor efficiency according to the motor efficiency and the fan efficiency The frequency of the motor is used as the operating frequency of the motor.

[0037] In this embodiment, since the efficiency of the fan is not less than that of the motor, the attenuation of the heat dissipation of the motor winding is lower than the attenuation of the heat generation of the winding, so as to ensure that the temperature rise of the motor winding meets the requirements of actual use. The use frequency of the motor when the motor and...

no. 2 example

[0038] According to the second embodiment of the present invention, the method includes firstly determining the motor efficiency of the motor according to the frequency of the motor, secondly determining the fan efficiency of the fan according to the frequency of the fan, and then finding out when the fan efficiency is not less than the motor efficiency according to the motor efficiency and the fan efficiency The frequency of the motor is used as the frequency of the motor. Among them, the efficiency curves of motor efficiency and fan efficiency can be drawn in the same coordinate system, and then the frequency of use of the motor can be determined intuitively from the graph. that is, figure 1 As shown, the solid line η (motor) in the figure represents the motor efficiency of the variable frequency motor in this embodiment, and the efficiency of the motor is drawn according to each frequency point of the motor. The dotted line η (radiation) in the figure represents the effici...

no. 3 example

[0039] According to the third embodiment of the present invention, the method includes firstly determining the motor efficiency of the motor according to the frequency of the motor, secondly determining the fan efficiency of the fan according to the frequency of the fan, and then finding out when the fan efficiency is not less than the motor efficiency according to the motor efficiency and the fan efficiency The frequency of the motor is used as the frequency of the motor. If the motor efficiency is recorded as η1, the motor efficiency can be obtained by the following formula:

[0040] η1=T×60×f1×(1-s) / (9.55×P 输入 ×p), where T is the output torque of the motor, s is the slip of the motor, p is the number of pole pairs of the motor, f1 is the frequency of the motor, P 输入 is the input power of the motor. The output torque of the motor is obtained by the following formula:

[0041]T=9.55×P 输出 / n1, where P 输入 is the input power of the motor, and n1 is the speed of the motor. ...

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Abstract

The invention provides a radiating method for a variable frequency motor, and an air conditioner. The radiating method comprises the steps of determining the motor efficiency of a motor according to the frequency of the motor; determining the fan efficiency of a fan according to the frequency of the fan; and taking the frequency of the motor whose fan efficiency is not less than the motor efficiency as the operating efficiency of the motor according to the motor efficiency and the fan efficiency. The fan efficiency is not less than the motor efficiency, so that the attenuation of the heat dissipating capacity of a winding of the motor is lower than that of the heating value of the winding; therefore, it is ensured that the temperature rise of the winding of the motor satisfies the actual application requirement; and in addition, the operating frequency of the motor is determined when the motor and the fan are operating synchronously according to the motor efficiency and the fan efficiency, so that the radiating effect of the motor is effectively improved.

Description

technical field [0001] The invention relates to the technical field of air-conditioning equipment, in particular to a heat dissipation method for a variable frequency motor and an air conditioner. Background technique [0002] The cooling fan of the standard three-phase AC variable frequency motor is not in the same axis as the motor rotor, so a separate power supply is required. In order to ensure the heat dissipation effect, the speed of the cooling fan is kept constant and does not decrease with the decrease of the rotor speed of the variable frequency motor body, so that the variable frequency motor needs to provide two sets of different power supplies to work normally. Among them, the structure of the three-phase asynchronous motor is similar to that of the single-phase asynchronous motor, and the three-phase winding is embedded in the stator core slot (there are three structures: single-layer chain type, single-layer concentric type and single-layer cross type). After...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K9/06H02P27/04
CPCH02K9/06H02P27/04
Inventor 陈生
Owner GREE ELECTRIC APPLIANCES INC
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