公开(公告)号：JPH09250449A

公开(公告)日：1997-09-22

申请号：JP5749696

申请日：1996-03-14

Applicant: MATSUSHITA REFRIGERATION

Inventor： SHIBUYA HIROMI ,  YAMAMOTO HIDEO ,  SATOMURA TAKASHI

IPC: F04B39/08 ,  F04B17/04 ,  F04B35/04 ,  F04B49/06

Abstract: PROBLEM TO BE SOLVED: To prevent the over-strokes of a piston from being generated and restrict efficiency from being lowered by providing an inverter control means for increasing the output voltage of an inverter circuit by each reference voltage value if the reference value of the top dead center is greater than the calculated top dead center position of the piston. SOLUTION: In a vibration type compressor, the AC power converted from DC power is supplied from an inverter circuit 25 to an annular coil of a compressor, thereby a piston communicating with the coil vibrates in the cylinder axial direction, and refrigerant compression is performed. At this time, the analog position signal of the piston from a displacement detector 21 is input to a top dead center position calculation means 28, and the top dead center being the maximum value at the upper end position of the piston is calculated here. The top dead center position from the top dead center position comparison means 29 and the top dead center reference value are compared, if the reference value is greater than the top dead center position, a waveform generation means 31 outputs the waveform signal to a base drive circuit 26 so that the inverter output voltage is made greater by the reference voltage.

公开(公告)号：JPH09137781A

公开(公告)日：1997-05-27

申请号：JP29673695

申请日：1995-11-15

Applicant: MATSUSHITA REFRIGERATION

Inventor： SATOMURA TAKASHI ,  YAMAMOTO HIDEO ,  SHIBUYA HIROMI

IPC: F04B49/06 ,  F04B17/04 ,  F04B35/04

Abstract: PROBLEM TO BE SOLVED: To operate a vibration type compressor without reducing a compressive efficiency by changing the frequency of piston driving force step by step per constant time, deciding a frequency when a current value detected by a driving force detecting part becomes in a minimum level as a resonance frequency, and setting it as the frequency of piston driving force. SOLUTION: When a vibration type compressor is driven, a piston 12 is driven in a frequency from a control unit 18 by a piston driving unit 13, and a piston driving frequency is set as a detection starting frequency in the case where it is judged by the control unit 18 that detection of a resonance frequency is started. At this time, the current value of piston driving force is detected by a driving force detecting unit 15, and a frequency detected by the driving force detecting unit 15 and a current value detected by the driving force detecting unit 15 are stored. In the control unit 18, the piston driving frequency is changed by a prescribed amount, a minimum current value is detected in a stored current value in the case where a frequency is a detection completed frequency, the frequency is decided as a resonance frequency, and it is set as the frequency of piston driving force.

公开(公告)号：JPH11132580A

公开(公告)日：1999-05-21

申请号：JP30016597

申请日：1997-10-31

Applicant: MATSUSHITA REFRIGERATION

Inventor： YAMAMOTO HIDEO ,  SATOMURA TAKASHI ,  SHIBUYA HIROMI

IPC: F25D11/00 ,  F25B1/02 ,  F25D11/02

Abstract: PROBLEM TO BE SOLVED: To enhance the freshness retaining performance of food while saving energy. SOLUTION: The refrigerator comprises an oscillatory compressor 7 having a resonance spring coupled with the shaft of a linear motor, and a control means 13 for increasing the refrigerating capacity by increasing the stroke when the evaporation temperature and the condensation temperature increase and decreasing the refrigerating capacity by decreasing the stroke when the evaporation temperature and the condensation temperature decrease by operating the oscillatory compressor 7 while keeping the top dead center clearance of a piston at a first predetermined value regardless of the pressure conditions of cooling system. According to the arrangement, deficiency of cooling is eliminated by increasing the refrigerating capacity naturally and power consumption can be reduced under light load by decreasing the refrigerating capacity naturally, thereby reducing the input power.

公开(公告)号：JPH10210763A

公开(公告)日：1998-08-07

申请号：JP936097

申请日：1997-01-22

Applicant: MATSUSHITA REFRIGERATION

Inventor： WATAKABE SHUSAKU ,  YAMAMOTO HIDEO ,  SHIBUYA HIROMI ,  SATOMURA TAKASHI

IPC: H02M7/48 ,  H02M7/5387 ,  H02P25/04 ,  H02P27/06 ,  H02P7/63

Abstract: PROBLEM TO BE SOLVED: To reduce the number of switching devices and reduce the cost, by a method wherein the central connection point of two switching devices is used as one of the output terminals of a smoothing circuit and the central connection point of the smoothing circuit is used as the other output terminal of the smoothing circuit. SOLUTION: Switching devices 7a and 7b are connected in series to the output of a smoothing circuit 6 which is used for smoothing the output of a converter circuit 2 and composed of resistors R and capacitors Ca. An output terminal C is the central point of the output voltage of the smoothing circuit 6 and an output terminal D is the central connection point of the switching devices 7a and 7b. Driving signals are inputted to the switching devices 7a and 7b respectively to switch them, and an AC voltage waveform is outputted between the output terminals C-D. Thus, an AC waveform can be outputted by only two switching devices, so that the cost can be reduced.

公开(公告)号：JPH09317653A

公开(公告)日：1997-12-09

申请号：JP13808496

申请日：1996-05-31

Applicant: MATSUSHITA REFRIGERATION

Inventor： SATOMURA TAKASHI ,  YAMAMOTO HIDEO ,  SHIBUYA HIROMI

IPC: F04B49/06

Abstract: PROBLEM TO BE SOLVED: To improve compression efficiently by operating a piston constantly at resonance frequency not only by carrying out feed-back control based on the deviation from an expected value of a top dead center of the piston but also by periodically detecting the resonance frequency on an oscillatory type compressor used for various electrical equipment. SOLUTION: A voltage value of alternating current voltage from a driving part 103 to apply to a piston 102 is increased and decreased based on the top dead center positional deviation detected by a top dead center positional deviation detection part 108, and a frequency value of alternating current voltage from the driving part 103 to apply to the piston 102 is increased and decreased in accordance with frequency deviation detected by a frequency deviation detection part 111 for each constant time.

公开(公告)号：JPH09113092A

公开(公告)日：1997-05-02

申请号：JP26672695

申请日：1995-10-16

Applicant: MATSUSHITA REFRIGERATION

Inventor： YAMAMOTO HIDEO ,  FUJIMOTO SHINJI ,  ASAKAWA OSAMU ,  SATOMURA TAKASHI ,  SHIBUYA HIROMI

IPC: F04B49/06 ,  F25B1/02 ,  F25D11/02 ,  F25D17/06 ,  F25D17/08

Abstract: PROBLEM TO BE SOLVED: To improve energy saving and properties of preservation of freshness of foodstuff. SOLUTION: A variable capacity compressor 7 and a control means 14 which makes the compressor 7 operate in a low capacity and also makes a refrigerating chamber damper 6 open while a freezing chamber damper 13 is held in a closed state, when the temperature detected by a refrigerating chamber temperature detector 5 is an upper-limit set temperature or above when a temperature detected by a freezing chamber temperature detector 4 is a set temperature or below, are provided. By this constitution, the variable capacity compressor is operated in the low capacity so as to cool only a refrigerating chamber, when it happens that the temperature of the refrigerating chamber alone rises to the upper-limit set temperature or above although the temperature of a freezing chamber is the set temperature or below. In this way the temperature of the refrigerating chamber is always kept to be a prescribed one and the freshness of foodstuff in the refrigerating chamber is prevented from lowering due to a rise in the temperature thereof.

公开(公告)号：JPH08284843A

公开(公告)日：1996-10-29

申请号：JP8813595

申请日：1995-04-13

Applicant: MATSUSHITA REFRIGERATION

Inventor： SATOMURA TAKASHI ,  YAMAMOTO HIDEO

IPC: F04B49/06 ,  F04B17/04 ,  F25B1/00

Abstract: PURPOSE: To provide a vibrating type compressor that is able to prevent any drop in compression efficiency by the stabilization of a piston actuation and also any damage to a device from occurring. CONSTITUTION: This compressor is composed of a piston driving part 13 driving a piston 12 after being given driving force, a displacement detecting part 14 connected in the axial direction of the piston 12, a top dead center position detecting element 15 detecting a top dead center position from a piston position signal out of this displacement detecting element 14, and a driving force control part 16 altering the driving force given to the piston 12 from the piston driving part 13 according to a difference between the top dead center position and the preset top dead center position reference valve immediately after the top dead center position detecting element 15 has detected the top dead center position.