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Integrated scroll compressor and its dynamic process oscillation suppression method and device

A scroll compressor and dynamic process technology, which is applied in the control of electromechanical transmission, motor control, motor generator control, etc., can solve problems such as large common-mode electromagnetic interference, inability to know the vibration state of the motor, and voltage signal distortion

Active Publication Date: 2020-04-24
江西滨凌科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the integrated scroll compressor, the supporting frequency converter is installed in the narrow compressor casing, the circuit board area of ​​the frequency converter is less than "12cm x 12cm", and for cost considerations, the frequency converter of the integrated scroll compressor The hall current sensor that is standard in the industrial inverter is not installed, but the sampling resistor is installed on the lower bridge arm of the three-phase full-bridge circuit of the inverter to indirectly estimate the three-phase current of the motor. When the motor is running at high speed, common-mode electromagnetic interference It is very large, which may cause severe distortion of the voltage signal on the sampling resistor, and cannot accurately measure the current flowing through the sampling resistor
Thus it is impossible to know whether the motor enters the oscillation state

Method used

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  • Integrated scroll compressor and its dynamic process oscillation suppression method and device
  • Integrated scroll compressor and its dynamic process oscillation suppression method and device
  • Integrated scroll compressor and its dynamic process oscillation suppression method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0059] Such as figure 1 As shown, this embodiment provides a method for suppressing dynamic process oscillation of an integrated scroll compressor, the method includes the following steps:

[0060] S101. Obtain a DC bus current.

[0061] The DC bus current in this embodiment refers to the DC bus current on the frequency converter circuit board of the integrated scroll compressor, which is obtained through non-isolated circuit measurement, such as figure 2 As shown, the first sampling resistor RS of milliohm level is connected in series between the confluence point of the lower bridge arm of the three-phase full bridge and the negative pole of the battery, and the voltage V of the microvolt level at both ends of the first sampling resistor RS is measured. RS , after being amplified by the operational amplifier A1, the DC bus current I suitable for single-chip processing is obtained s , DC bus current I s It is also the working current of the motor that is supplied by the ba...

Embodiment 2

[0093] Such as Figure 8 As shown, this embodiment provides an integrated scroll compressor dynamic process oscillation suppression device, which includes an acquisition module 801, a first calculation module 802, a second calculation module 803, a first judgment module 804, a second judgment module Module 805, the first oscillation suppression module 806 and the second oscillation suppression module 807, the specific functions of each module are as follows:

[0094] The acquiring module 801 is configured to acquire the DC bus current.

[0095] The first calculation module 802 is used to perform high-pass filtering and discrete Fourier transform on the DC bus current to calculate the first oscillation characteristic variable. The first calculation module 802 is as follows: Figure 9 shown, including:

[0096] The filter processing unit 8021 is configured to use a high-pass filter to perform filter processing on the DC bus current.

[0097] The discrete Fourier transform uni...

Embodiment 3

[0110] This embodiment provides an integrated scroll compressor, including a frequency converter and a motor, the frequency converter is connected to the motor, the single-chip microcomputer of the frequency converter stores a program, and when the single-chip microcomputer executes the stored program, the above implementation is realized. The method of Example 1 is as follows:

[0111] Obtain the DC bus current; perform high-pass filtering and discrete Fourier transform on the DC bus current, and calculate the first oscillation characteristic variable; calculate the reactive power of the motor, filter the reactive power with a high-pass filter, and calculate The second oscillation characteristic variable; according to the first oscillation characteristic variable and the second oscillation characteristic variable, a linear discriminator is constructed to judge whether the dynamic process of the integrated scroll compressor oscillates; when the dynamic process of the integrated...

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Abstract

The invention discloses an integrated scroll compressor and a dynamic process oscillation suppression method and device thereof. The method comprises: after an oscillation occurs in the dynamic process of the integrated scroll compressor, determining whether the oscillation is a small oscillation or a large oscillation according to a constructed linear discriminator,; when the oscillation is a small oscillation, increasing the quadrature-axis component in the output voltage of the motor to suppress the small oscillation; when the oscillation is a large oscillation, increasing the quadrature-axis component in the output voltage of the motor and modulating the output frequency of a frequency converter according to the change value of a DC bus current to suppress the large oscillation. The method can proactively suppress the oscillation generated by the dynamic process of the integrated scroll compressor, so that the motor of the integrated scroll compressor can smoothly pass through an unstable region which may be encountered in the acceleration process or the deceleration process.

Description

technical field [0001] The invention relates to an integrated scroll compressor and a dynamic process oscillation suppression method and device thereof, belonging to the technical field of motor control. Background technique [0002] The integrated scroll compressor for vehicle air conditioner is composed of three parts: a scroll compression disc, a magnetic pole embedded permanent magnet synchronous motor (IPMSM) driving the compression disc, and a frequency converter to control the motor. [0003] In pursuit of high speed, high power density, and high reliability, the compressor is driven by an IPMSM motor. The rotor permanent magnets of IPMSM are not evenly distributed along the rotor circumference, so the magnetomotive force generated during rotation is non-sinusoidally distributed, and the magnetomotive force contains the second harmonic. In addition, unlike the rated frequency of the motor in general industrial applications, which is generally 50Hz, the rated frequenc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/05H02P29/50
CPCH02P21/05H02P29/50
Inventor 刘建民肖兵郭灼炎
Owner 江西滨凌科技有限公司
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