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Linear compressor drive device

A technology of linear compressors and driving devices, applied in electromechanical devices, machines/engines, mechanical equipment, etc., can solve problems such as information loss, increased computing load of digital circuits, and inability to obtain actions, etc.

Inactive Publication Date: 2010-05-26
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0055] However, in the conventional method for detecting the piston position of the linear compressor 100 described above, the piston displacement x', which relatively represents the piston position P, is calculated using an integrator and a differentiator based on the piston amplitude center position Pav. It cannot be expected to detect the piston position with high precision
In other words, if the actual integrator and differentiator are composed of analog circuits, the characteristic changes due to component errors and temperature, etc., and if they are composed of digital circuits, the ideal operation cannot be obtained due to information loss during sampling and holding, etc.
[0056] In addition, when the circuit used for detecting the piston position of the above-mentioned linear compressor is composed of a digital circuit, in order to improve the accuracy of position detection, the measurement cycle of the applied current I and voltage V on the linear compressor can also be shortened. cycle, corresponding to this, the above-mentioned calculation cycle is shortened, and the calculation load of the digital circuit is increased

Method used

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Experimental program
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no. 1 Embodiment

[0181] figure 1 It is a block diagram for explaining the linear compressor driving device of the first embodiment of the present invention.

[0182] The linear compressor driving device 101 of the first embodiment is a device for driving the linear compressor 100 so that the reciprocating movement of the piston reaches a resonance state when the frequency of the reciprocating movement of the piston is the frequency (resonance frequency) Fr.

[0183] That is to say, the linear compressor driving device 101 includes:

[0184] Power supply 1, used to generate DC voltage VDC as the power supply voltage;

[0185] The inverter 2 is used to convert the power supply voltage VDC into an AC voltage Vd of a specified frequency, and output it to the linear compressor 100;

[0186] The current detector 9 is used to monitor the inverter output current Id output from the inverter 2 to the linear compressor 100;

[0187] Output current detection device 3, for detecting the inverter output...

no. 2 Embodiment

[0276] Figure 4 It is a block diagram for explaining the linear compressor driving device of the second embodiment of the present invention.

[0277] The linear compressor driving device 102 of the second embodiment has a piston stroke calculating device 41, which is calculated by the above-mentioned piston speed calculating device 8 in the linear compressor driving device 101 of the first embodiment. The peak value vO of the piston speed and the inverter driving frequency Fd determined by the inverter controller 6 are used to calculate the reciprocating stroke of the piston, and output the piston stroke information Ipst representing the piston stroke. The inverter controller 6 of the second embodiment adjusts the pulse width of the PWM signal Scp for switching the inverter 2 according to the above-mentioned resonance frequency information Irf, and uses the PWM signal Scp whose pulse width has been adjusted as the inverter drive The control signal is output, and at the same ...

no. 3 Embodiment

[0319] Figure 5 It is a block diagram for explaining a linear compressor driving device according to a third embodiment of the present invention. and Figure 10 A coordinate system Y" representing the piston position based on the neutral position of the piston, and a coordinate system X" representing the piston position based on the cylinder head position Psh ( Figure 9 The contrast state of the 3rd coordinate system).

[0320] The linear compressor driving device 103 of the third embodiment has a bottom dead center position calculating device 51 in the linear compressor driving device 101 of the above-mentioned first embodiment. The peak value vm of the piston speed and the inverter drive frequency Fd determined by the above-mentioned inverter controller 6 are used to calculate the displacement ybd of the piston bottom dead center position Pbd based on the piston neutral position Pav" (see Figure 10 ), as the distance information between the piston neutral position Pav ...

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Abstract

The present inventive linear compressor drive device (101) comprising an inverter (2) for supplying a drive current of a specified frequency to a linear compressor (100), wherein an inverter controller (6) is provided to control the inverter (2) so that the frequency of an output current therefrom is a resonance frequency based on resonance frequency information and to measure the instantaneous values of the output current Id and output voltage Vd of the inverter (2) at a phase timing that renders zero a change in the output current Id of the inverter (2) to thereby calculate a piston stroke from the measured values. Such a linear compressor drive device (101) can detect accurately the piston stroke and top clearance of a linear compressor by a simple processing without using a position sensor.

Description

technical field [0001] The present invention relates to a linear compressor driving device, and relates to a device for driving a linear compressor that uses a linear motor to reciprocate a piston to generate compressed gas in a cylinder. Background technique [0002] Devices known in the past to generate compressed gas are linear compressors using mechanical elastic devices or the elasticity of gas. [0003] Figure 7 It is a sectional view explaining a conventional linear compressor, and specifically shows the structure of a linear compressor using a spring as an elastic material. [0004] The linear compressor 100 has the body 71 which consists of the adjacent cylinder 71a and the motor part 71b. The cylinder portion 71a of the body 71 forms a cylindrical cylinder of the linear compressor, and the piston 72 is slidable in the cylinder portion 71a in a direction parallel to the central axis of the cylinder (piston axis direction). [0005] On the back side of the piston ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P5/00F04B49/06F04B9/00F04B17/04F04B35/04G05B19/00H02K33/06H02P25/06
CPCF04B2201/0202G05B19/00F04B35/045F04B2203/0401F04B2203/0402F04B2201/0201F04B2203/0404F04B49/12F04B35/04F04B49/06F04B39/0005F04B2201/0806F04B2203/0405F04B2207/046
Inventor 植田光男吉冈包晴
Owner PANASONIC CORP