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Control device of linear compressor drive system

A linear compressor and drive system technology, applied in the control input, AC motor control, pump control and other directions related to the system state, can solve the problems such as failure to prevent collision, power consumption, and low possibility of collision.

Inactive Publication Date: 2004-06-30
MATSUSHITA REFRIGERATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] In addition, there is also a problem that, since the impact is less likely to occur under the operating condition with a large top clearance, even if a small fluctuation in the top dead center of the piston is controlled to stabilize the movement, not only the effect of preventing the impact is not effective, but also the Controlling also consumes power

Method used

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  • Control device of linear compressor drive system
  • Control device of linear compressor drive system
  • Control device of linear compressor drive system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] figure 1 It is a block diagram of the control device of the linear compressor drive system of Embodiment 1 of this invention.

[0051] figure 1 Among them, 30 is a current detecting means for measuring the power supply current supplied from the power supply device 31 to the linear compressor 1 . 32 is an instability detection unit that outputs an instability detection signal based on the output of the current detection unit 30 .

[0052] When the top dead center position of the piston fluctuates greatly, the force acting on the piston, such as compression power, will fluctuate, and the current flowing through the motor will also fluctuate. Therefore, the unstable detecting part 32 extracts the variation of the peak value of the electric current measured by the current detecting part, and if the variation of the peak value in a certain period is larger than a predetermined value, it is estimated and judged that the operation of the piston is unstable, so an unstable ...

Embodiment 2

[0061] Figure 5 It is a block diagram of the control device of the linear compressor driving system according to Embodiment 2 of the present invention.

[0062] Figure 5 Among them, 40 is a sound / vibration detection part made of a vibration sensor, which is installed on the compressor to detect sound / vibration. 41 is an unstable detection part.

[0063] If the action of the piston becomes unstable, the compressor body 3 (refer to Figure 10 ) of the movable part and the fixed part collide, the impact sound and vibration will be greater than the normal situation due to the impact of the compressor. When the output of the vibration detection part is greater than a predetermined value due to the impact, the instability detection part 41 judges that the piston is unstable and outputs an instability detection signal.

[0064] 42 is an instability avoidance means, which outputs a voltage reduction signal to the voltage determination means 43 when an instability detection signal...

Embodiment 3

[0070] Figure 6 It is a block diagram of the control device of the linear compressor driving system of Embodiment 3 of the present invention.

[0071] Figure 6 Among them, 50 is the displacement detecting part of the displacement of the measuring piston installed in the compressor.

[0072] 51 is an instability detecting part, which detects the fluctuation of the top dead center position of the piston from the output of the displacement detecting part 50, and outputs an instability detection signal when the fluctuation of the top dead center position is larger than a predetermined value.

[0073] 52 is an instability avoiding part, which normally outputs a fixed voltage waveform, but when an instability detection signal is input, a voltage waveform different from the waveform previously output is selected from the waveforms stored in the waveform storage part 53 and output.

[0074] The power supply device 54 amplifies the voltage waveform output from the voltage instabili...

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Abstract

A control apparatus for a linear compressor driving system is disclosed for stabilizing the behavior of a piston and thereby protecting the increase in noise vibration caused by collision and the reduction in reliability. This control apparatus stabilizes the behavior of the piston by including: an unstableness detecting means, which directly or indirectly detects that the behavior of the piston is unstable and then outputs an unstableness detection signal; and an unstableness avoiding means which is operated in accordance with the unstableness detection signal.

Description

technical field [0001] The present invention relates to a control device for a linear compressor drive system used in refrigerators, air conditioners and the like. Background technique [0002] In recent years, from the viewpoint of global environmental protection and energy saving, the importance of increasing the efficiency of refrigeration equipment has been increasingly emphasized, and compressors using linear motors have been widely used due to their simple structure, high efficiency, and low manufacturing cost. However, in order to operate the linear compressor efficiently, it is necessary to reciprocate the piston while maintaining a small gap at the top dead center of the piston, and at the same time, it is necessary to control the refrigeration capacity of the compressor by the size of the gap at the top dead center. And other controls that traditional connecting rod reciprocating compressors do not have. [0003] As a conventional control method of a linear compre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B35/04F04B49/10F24F11/02F24F11/49F24F11/61F24F11/64F24F11/74F24F11/86F24F11/88F24F11/89F24F110/12F24F140/00F24F140/10F24F140/60H02P25/06
CPCF04B49/10F04B35/045F04B17/04
Inventor 稻垣耕森田一郎片山诚井上阳
Owner MATSUSHITA REFRIGERATION
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