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Method and device for identifying motor magnetic pole pair number of mechanical periodic load

A periodic and logarithmic technology, applied in the control of electromechanical transmission, control of generators, motor generators, etc., can solve problems such as inability to control, achieve the effect of reducing control costs and improving versatility

Active Publication Date: 2015-12-30
GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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Problems solved by technology

Because, in some engineering applications, the number of pole pairs used to control the motor is not unique. At present, the number of pole pairs of the motor mainly includes two pairs of poles and three pairs of poles. If the control board cannot automatically identify the number of pole pairs of the control motor , will not be able to control

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  • Method and device for identifying motor magnetic pole pair number of mechanical periodic load
  • Method and device for identifying motor magnetic pole pair number of mechanical periodic load
  • Method and device for identifying motor magnetic pole pair number of mechanical periodic load

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Embodiment Construction

[0043] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0044] The technical solution of the present invention is to identify the number of magnetic pole pairs of the motor with mechanical periodic load by collecting the working current of the air conditioner motor during open-loop operation, and then performing Fourier transform processing on the current sampling data.

[0045] figure 1 It is a structural schematic diagram of the mechanical periodic load and its control circuit used in the embodiment of the present invention. Such as figure 1 As shown, the mechanical periodic load mainly includes a motor, a coordinate converter, an inverter and a current sampling unit connected to the motor and the coordinate converter respectively, wherein the coordinate converter includes a d-axis reference current for inputting And the q-axis reference current is converted from the t...

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Abstract

The invention discloses a method for identifying a motor magnetic pole pair number of a mechanical periodic load. The method comprises the following steps that: a control motor runs at a preset given speed, and a coordinate converter converts a d shaft reference current and a q shaft reference current into a three-phase reference current transmitted to an inverter, wherein the d shaft reference current is zero, and the q shaft reference current is a preset current; then a three-phase working current of a motor is collected with a preset sampling frequency, and the collected three-phase working current is converted into a d shaft working current and a q shaft working current; conversion from a time domain to a frequency domain is carried out on the q shaft working current having preset sampling points, and frequency domain signals are generated; the frequency of a harmonic coefficient having the largest amplitude in the frequency domain signals is obtained; and according to the frequency and the preset given speed, the magnetic pole pair number of the motor is calculated. The invention further discloses a device for identifying the motor magnetic pole pair number of the mechanical periodic load. According to the invention, the motor magnetic pole pair number of the mechanical periodic load is automatically identified, and the universality of a motor control circuit is improved.

Description

technical field [0001] The invention relates to the field of magnetic pole logarithm identification, in particular to a method and device for identifying the magnetic pole logarithm of a motor with mechanical periodic loads. Background technique [0002] With the development of the control industry, the permanent magnet synchronous motor has become the mainstream in the field of frequency conversion control due to its small size, light weight, and high energy efficiency. In the field of frequency conversion control, mechanical periodic loads account for a large proportion, such as compressors, pumping units, etc., and because the types of such equipment continue to increase, it is necessary to equip different control boards for different types of equipment, resulting in The rapid growth of device control board models has brought enormous pressure on product after-sales and inventory. Moreover, in the case of identical hardware, sometimes multiple sets of control boards have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14
Inventor 杨辉
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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