WO2011080240A2 - A hermetic compressor the winding temperature of which is measured - Google Patents

A hermetic compressor the winding temperature of which is measured Download PDF

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Publication number
WO2011080240A2
WO2011080240A2 PCT/EP2010/070739 EP2010070739W WO2011080240A2 WO 2011080240 A2 WO2011080240 A2 WO 2011080240A2 EP 2010070739 W EP2010070739 W EP 2010070739W WO 2011080240 A2 WO2011080240 A2 WO 2011080240A2
Authority
WO
WIPO (PCT)
Prior art keywords
motor
winding
thot
temperature
compressor
Prior art date
Application number
PCT/EP2010/070739
Other languages
French (fr)
Other versions
WO2011080240A3 (en
Inventor
Mucahit Bacaksiz
Oner Hatipoglu
Mustafa Yuksel
Original Assignee
Arcelik Anonim Sirketi
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Arcelik Anonim Sirketi filed Critical Arcelik Anonim Sirketi
Publication of WO2011080240A2 publication Critical patent/WO2011080240A2/en
Publication of WO2011080240A3 publication Critical patent/WO2011080240A3/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
    • H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
    • H02P1/42—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual single-phase induction motor
    • H02P1/44—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual single-phase induction motor by phase-splitting with a capacitor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/60—Controlling or determining the temperature of the motor or of the drive
    • H02P29/64—Controlling or determining the temperature of the winding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0201—Current
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0202—Voltage

Definitions

  • the present invention relates to a hermetic compressor the winding
  • Hermetic compressors are used in cooling devices like the refrigerators and air conditioners. Hermetic compressors provide the recirculation of the refrigerant, compressed by a motor disposed in a closed casing, in the refrigerant cycle.
  • the compressor windings made of copper wires overheat and results in fire hazard as a result of the compressor being strained due to the rotor being locked or to more than normal load encountered in situations when the motor operates for a long period of time, the
  • the condenser and the fan thereof are deactivated.
  • the temperature of the winding cannot be measured since the winding is inside a closed casing and the increase in the winding temperature is controlled by the mechanical thermal protectors installed to the terminal end of the winding extending to the outside of the casing.
  • the thermal protectors stop the operation of the compressor by interrupting the supply of electric current when the compressor temperature exceeds a limit value.
  • the temperature of the terminal outside the casing is lower than the temperature of the winding remaining inside the casing since the terminal is affected by the temperature of the exterior surrounding.
  • the aim of the present invention is the realization of a hermetic
  • the hermetic compressor realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof, comprises a motor fed by the mains voltage with the main winding and the auxiliary winding actuated by the first and second switches.
  • the operation of the motor is controlled by a control unit.
  • the mains voltage connection of the motor is cut off by a third switch and the motor is fed by an AC-DC converter that generates digital voltage.
  • the control unit closes the switch of only the winding the temperature of which will be measured and measures the voltage on the winding by amplifying it with an amplifier.
  • the third switch is preferably a bi-directional switch and is connected to the mains voltage source in the first position and to the digital voltage source in the second position.
  • the control unit calculates the winding temperature by comparing the cold winding resistance prerecorded in the memory thereof by the producer with the winding resistance found from the winding voltage measured after the motor stops.
  • the control unit repeats the winding temperature calculation every time the motor stops.
  • control unit calculates the control unit based on the control unit's speed and speed. If the speed is greater than the limit winding temperature recorded in the memory thereof, the motor is not operated until the winding temperature falls below the limit temperature.
  • the control unit operates the motor again after waiting for a time period recorded in the memory thereof for the motor, in other words, the winding to cool down.
  • control unit if the winding temperature exceeds the limit temperature recorded in the memory thereof in both of the successive winding temperature measurements, waits for the motor to cool for a time period longer than the previous waiting period after the second measurement.
  • the temperatures of the windings are detected precisely by the amplifier at the digital voltage source and the compressor is enabled to start operating safely.
  • Figure 1 - is the perspective view of a hermetic compressor.
  • Figure 2 - is the perspective view of the control circuit of a hermetic
  • a variable speed hermetic compressor (1) that provides the refrigerant cycle to be performed, comprising a motor (2) having a main winding (AS) and an auxiliary winding (YS) fed by the mains voltage (Vac), a first switch (3) connected in series to the auxiliary winding (YS) providing the motor (2) to be operated by being actuated at the start up of the motor (2) so that the motor (2) can start up, a second switch (4) connected in series to the main winding (AS) providing the motor (2) to continue operating, a control unit (5) that controls the start up and operation of the motor (2) by actuating the switches (3 and 4) when required ( Figure 1 ).
  • the compressor (1 ) furthermore comprises
  • an AC-DC converter (8) disposed on the line between the motor (2) and the mains voltage (Vac), providing the mains voltage (Vac) to be converted to digital voltage (Vdc),
  • control unit (5) in order to calculate the temperature on the windings (AS or YS)
  • the third switch (7) is disposed on the line whereby the main winding (AS) and auxiliary winding (YS) are fed from the mains voltage (Vac).
  • the third switch (7) completes the motor (2) and the mains voltage (Vac) line while the motor (2) operates and is connected to the AC-DC converter (8) providing the motor (2) to be fed by the digital voltage (Vdc) by the control unit (5) changing the direction of the third switch (7) when the motor (2) stops.
  • Vdc digital voltage
  • the main winding (AS) resistance (Rcold_as) and the main winding (AS) temperature (Tcold_as) at room temperature before the compressor (1 ) operates are recorded in the memory of the control unit (5).
  • the control unit (5) cuts off the mains voltage (Vac) line of the motor (2) by changing the position of the third switch (7), in other words, deactivates the motor (2) and provides the motor (2) to be fed by the digital voltage (Vdc) by connecting the motor (2) to the AC-DC converter (8) in order to measure for example the temperature of the main winding (AS) while the motor (2) operates.
  • the control unit (5) provides some amount of current to pass through the main winding (AS) by closing the second switch (4).
  • the digital voltage of the main winding (AS) is amplified by the AC-DC converter (8) connected between the motor (2) and the digital voltage source (Vdc).
  • the resistance (Rhot_as) on the main winding (AS) can be measured precisely by means of the amplifier (6) increasing the voltage on the main winding (AS) that is fed by the digital voltage source (Vdc).
  • the control unit (5) calculates the temperature (Thot_as) of the main winding (AS) by comparing the resistance (Rcold_as) at room temperature recorded in the memory thereof with the resistance (Rhot_as) measured after the motor (2) operates for a while.
  • the control unit (5) waits for the motor (2) to cool down for a time period (t1 ) recorded in the memory thereof if the winding (AS or YS) temperature (Thot_as or Thot_ys) calculated after the motor (2) stops is greater than the limit winding (AS or YS) temperature (Thot_limit) recorded in the memory thereof.
  • the motor (2) is kept waiting until the winding (AS or YS) temperature (Thot_as or Thot_ys) falls below the limit winding (AS or YS) temperature (Thot_limit) and is operated again after cooling down.
  • the winding (AS or YS) temperature can rise instantaneously in some cases due to straining of the motor (2). This situation does not mean that there is a malfunction in the winding (AS or YS). Therefore, when the winding (AS or YS) temperature (Thot_as or Thot_ys) exceeds the limit winding (AS or YS) temperature (Thot_limit), the control unit (5) does not keep the motor (2) waiting for some time (t1 ) and does not provide the motor (2) to operate again afterwards.
  • the control unit (5) after keeping the motor (2) waiting for some time (tn) and operating again since the calculated winding (AS or YS) temperature (Thot_as or Thot_ys) has exceeded the limit temperature (Thot_limit), and when the motor (2) stops again then keeps the motor (2) waiting for a longer time period (tn + t) than the previous waiting period (tn) if the winding (AS or YS) temperature (Thot_as or Thot_ys) has exceeded the limit temperature (Thot_limit) once again.
  • the motor (2) waiting period (tn) is not sufficient for the winding (AS or YS) temperature (Thot_as or Thot_ys) to be decreased to the normal level, since for example the ambient temperature being high, therefore in the following operation the winding (AS or YS) temperature (Thot_as or ThoLys) may exceed the limit winding (AS or YS) temperature
  • the control unit (5) alerts the user by completely turning off the compressor (1 ) if the motor (2) is kept waiting for successive number (N) of cycles prerecorded in the memory thereof by the producer due to the calculated winding (AS or YS) temperature (Thot_as or ThoLys) being high in the previous operation. Keeping the motor (2) waiting for numerous times successively due to the winding (AS or YS) temperature (Thot_as or ThoLys) exceeding the limit winding (AS or YS) temperature (Thot_limit) shows that there is a malfunction in the winding (AS or YS) or the compressor (1 ). Therefore, the control unit (5) stops the compressor (1 ) and alerts the user when such a condition is detected. Consequently, the compressor (1) is prevented from operating in a manner that adversely affects its safety.
  • the winding (AS or YS) temperatures are detected by the motor (2) being connected to the AC-DC converter (8) and the resistance (Rhot_as or RhoLys) of the winding (AS or YS) of which the temperature will be measured being calculated precisely by means of the amplifier (6).
  • the control unit (5) keeps the motor (2) waiting until getting to below the limit winding temperature (ThoLlimit) and prevents the compressor (1 ) from being damaged if the detected winding (AS or YS) temperature (Thot_as or ThoLys) is above the limit winding (AS or YS) temperature (ThoLlimit).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

The present invention relates to a variable speed hermetic compressor (1) providing the refrigerant cycle to be performed, comprising a motor (2) fed by the mains voltage (Vac), a main winding (AS), an auxiliary winding (YS), a first switch (3) connected in series to the auxiliary winding (YS) providing the motor (2) to be operated by being actuated at the start up so that the motor (2) can start up, a second switch (4) connected in series to the main windings (AS) providing the motor (2) to continue operating, and a control unit (5) that controls the start up and operation of the motor (2) by actuating the switches (3 and 4) when required.

Description

Description
A HERMETIC COMPRESSOR THE WINDING TEMPERATURE OF WHICH IS
MEASURED
[0001] The present invention relates to a hermetic compressor the winding
temperature of which is measured.
[0002] Hermetic compressors are used in cooling devices like the refrigerators and air conditioners. Hermetic compressors provide the recirculation of the refrigerant, compressed by a motor disposed in a closed casing, in the refrigerant cycle. The compressor windings made of copper wires overheat and results in fire hazard as a result of the compressor being strained due to the rotor being locked or to more than normal load encountered in situations when the motor operates for a long period of time, the
condenser and the fan thereof are deactivated. In hermetic compressors, the temperature of the winding cannot be measured since the winding is inside a closed casing and the increase in the winding temperature is controlled by the mechanical thermal protectors installed to the terminal end of the winding extending to the outside of the casing. The thermal protectors stop the operation of the compressor by interrupting the supply of electric current when the compressor temperature exceeds a limit value. However, the temperature of the terminal outside the casing is lower than the temperature of the winding remaining inside the casing since the terminal is affected by the temperature of the exterior surrounding.
Therefore, it is not possible to provide sufficient protection by using the thermal protector that is disposed outside the compressor casing.
[0003] In the state of the art United States Patent Document No.
US20030097849, the explanation is given for the temperature of the compressor coil being proportional with the resistance of a coil of the solenoid valve and the coil resistance of the solenoid valve is calculated from the voltage and the current passing through solenoid valve coil.
When the coil temperature of the compressor calculated based on a relation with the solenoid coil temperature rises above a certain
temperature, the coil temperature is prevented from rising furthermore by the compressor being stopped or operated more slowly. [0004] In the state of the art European Patent Document No. EP1803936, a proportional curve formed with winding temperatures corresponding to certain pre-calculated winding resistances and the measured winding temperatures of the compressor by the effect of ambient temperature is recorded in a control unit. Thereafter, the winding resistance is calculated from the voltage drawn by the compressor and the resistance ratios and the corresponding winding temperature is found by comparing with the said curve recorded to the control unit.
[0005] In the state of the art Korean Patent Document No. KR20040064493, a compressor is explained wherein the motor resistance and temperature are calculated by connecting the motor to a digital resistance source.
However, here the motor resistance is calculated approximately by the motor voltage and the drawn current, the winding resistance and hence the temperatures cannot be calculated due to the impedance formed in the windings.
[0006] The aim of the present invention is the realization of a hermetic
compressor that is provided to operate safely by detecting the winding temperature.
[0007] The hermetic compressor realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof, comprises a motor fed by the mains voltage with the main winding and the auxiliary winding actuated by the first and second switches. The operation of the motor is controlled by a control unit. In order to understand whether or not the main winding and the auxiliary winding are overheated, the mains voltage connection of the motor is cut off by a third switch and the motor is fed by an AC-DC converter that generates digital voltage. The control unit closes the switch of only the winding the temperature of which will be measured and measures the voltage on the winding by amplifying it with an amplifier. The third switch is preferably a bi-directional switch and is connected to the mains voltage source in the first position and to the digital voltage source in the second position.
[0008] The control unit calculates the winding temperature by comparing the cold winding resistance prerecorded in the memory thereof by the producer with the winding resistance found from the winding voltage measured after the motor stops. The control unit repeats the winding temperature calculation every time the motor stops.
[0009] In an embodiment of the present invention, if the winding temperature
calculated by the control unit is greater than the limit winding temperature recorded in the memory thereof, the motor is not operated until the winding temperature falls below the limit temperature. The control unit operates the motor again after waiting for a time period recorded in the memory thereof for the motor, in other words, the winding to cool down.
[0010] In an embodiment of the present invention, the control unit, if the winding temperature exceeds the limit temperature recorded in the memory thereof in both of the successive winding temperature measurements, waits for the motor to cool for a time period longer than the previous waiting period after the second measurement.
[001 1] In an embodiment of the present invention, if the motor has been kept waiting for numerous times successively due to the winding temperature being higher than the limit winding temperature, the control unit
determines that there is an error in the windings or the compressor and warns the user about the incurred error by completely turning off the compressor.
[0012] By means of the control unit of the present invention, the temperatures of the windings are detected precisely by the amplifier at the digital voltage source and the compressor is enabled to start operating safely.
[0013] A hermetic compressor realized in order to attain the aim of the present invention is illustrated in the attached figures, where:
[0014] Figure 1 - is the perspective view of a hermetic compressor.
[0015] Figure 2 - is the perspective view of the control circuit of a hermetic
compressor.
[0016] The elements illustrated in the figures are numbered as follows:
1. Compressor
2. Motor
3. First switch
4. Second switch 5. Control unit
6. Voltage amplifier
7. Third switch
8. AC-DC converter
[0017] A variable speed hermetic compressor (1) that provides the refrigerant cycle to be performed, comprising a motor (2) having a main winding (AS) and an auxiliary winding (YS) fed by the mains voltage (Vac), a first switch (3) connected in series to the auxiliary winding (YS) providing the motor (2) to be operated by being actuated at the start up of the motor (2) so that the motor (2) can start up, a second switch (4) connected in series to the main winding (AS) providing the motor (2) to continue operating, a control unit (5) that controls the start up and operation of the motor (2) by actuating the switches (3 and 4) when required (Figure 1 ).
[0018] The compressor (1 ) furthermore comprises
- an AC-DC converter (8) disposed on the line between the motor (2) and the mains voltage (Vac), providing the mains voltage (Vac) to be converted to digital voltage (Vdc),
- a voltage amplifier (6) installed between the motor (2) and the AC-DC converter (8),
- a third switch (7) disposed in the line between the motor (2) and the AC-DC converter (8), providing the motor (2) to be fed with digital voltage (Vdc) by the control unit (5) changing the position thereof when the motor (2) stops (Figure 2).
[0019] The control unit (5), in order to calculate the temperature on the windings (AS or YS)
- providing the third switch (7) to be connected to the AC-DC converter (8) by cutting off the line whereby the motor (2) is fed from the mains voltage (Vac) by changing the position of the third switch (7),
- reads the digital voltage (Vdcs) passing thereon through the AC-DC converter (8) and calculates the resistance (Rhot_as or Rhot_ys) of the winding (AS or YS) by turning off the switch (3 or 4) of the winding (AS or YS) the temperature of which will be measured and
- calculates the temperature (Thot_as or Thot_ys) of the winding (AS or YS) by comparing the resistance of the winding (Rcold_as veya
Rcold_ys) prior to operation of the motor (2) and the resistance (Rhot_as or Rhot_ys) measured after the motor (2) is deactivated and connected to the AC-DC converter (8).
[0020] Current passes through both of the windings (AS and YS) by means of the first switch (3) and the second switch (4) that are actuated for start up of the motor (2). After the motor (2) starts operating, the current of the auxiliary winding (YS) is cut off by opening the first switch (3). The main winding (AS) overheats if the motor (2) operates for a long period of time, or the auxiliary winding (YS) overheats if the motor (2) encounters overload during start up of the motor (2). The motor (2) is very much affected from the heat of the windings (AS or YS) since the motor (2) is inside the compressor (1 ) casing and cannot receive air. The third switch (7) is disposed on the line whereby the main winding (AS) and auxiliary winding (YS) are fed from the mains voltage (Vac). The third switch (7) completes the motor (2) and the mains voltage (Vac) line while the motor (2) operates and is connected to the AC-DC converter (8) providing the motor (2) to be fed by the digital voltage (Vdc) by the control unit (5) changing the direction of the third switch (7) when the motor (2) stops. Thus, as soon as the motor (2) is deactivated, the temperature of the windings (AS and YS) can be measured while still hot.
[0021] The main winding (AS) resistance (Rcold_as) and the main winding (AS) temperature (Tcold_as) at room temperature before the compressor (1 ) operates are recorded in the memory of the control unit (5). The control unit (5) cuts off the mains voltage (Vac) line of the motor (2) by changing the position of the third switch (7), in other words, deactivates the motor (2) and provides the motor (2) to be fed by the digital voltage (Vdc) by connecting the motor (2) to the AC-DC converter (8) in order to measure for example the temperature of the main winding (AS) while the motor (2) operates. Afterwards, the control unit (5) provides some amount of current to pass through the main winding (AS) by closing the second switch (4). The digital voltage of the main winding (AS) is amplified by the AC-DC converter (8) connected between the motor (2) and the digital voltage source (Vdc). The resistance (Rhot_as) on the main winding (AS) can be measured precisely by means of the amplifier (6) increasing the voltage on the main winding (AS) that is fed by the digital voltage source (Vdc). The control unit (5) calculates the temperature (Thot_as) of the main winding (AS) by comparing the resistance (Rcold_as) at room temperature recorded in the memory thereof with the resistance (Rhot_as) measured after the motor (2) operates for a while.
[0022] In an embodiment of the present invention, the control unit (5) waits for the motor (2) to cool down for a time period (t1 ) recorded in the memory thereof if the winding (AS or YS) temperature (Thot_as or Thot_ys) calculated after the motor (2) stops is greater than the limit winding (AS or YS) temperature (Thot_limit) recorded in the memory thereof. The motor (2) is kept waiting until the winding (AS or YS) temperature (Thot_as or Thot_ys) falls below the limit winding (AS or YS) temperature (Thot_limit) and is operated again after cooling down. The winding (AS or YS) temperature (Thot_as or Thot_ys) can rise instantaneously in some cases due to straining of the motor (2). This situation does not mean that there is a malfunction in the winding (AS or YS). Therefore, when the winding (AS or YS) temperature (Thot_as or Thot_ys) exceeds the limit winding (AS or YS) temperature (Thot_limit), the control unit (5) does not keep the motor (2) waiting for some time (t1 ) and does not provide the motor (2) to operate again afterwards.
[0023] In another embodiment of the present invention, the control unit (5) after keeping the motor (2) waiting for some time (tn) and operating again since the calculated winding (AS or YS) temperature (Thot_as or Thot_ys) has exceeded the limit temperature (Thot_limit), and when the motor (2) stops again then keeps the motor (2) waiting for a longer time period (tn + t) than the previous waiting period (tn) if the winding (AS or YS) temperature (Thot_as or Thot_ys) has exceeded the limit temperature (Thot_limit) once again. The motor (2) waiting period (tn) is not sufficient for the winding (AS or YS) temperature (Thot_as or Thot_ys) to be decreased to the normal level, since for example the ambient temperature being high, therefore in the following operation the winding (AS or YS) temperature (Thot_as or ThoLys) may exceed the limit winding (AS or YS) temperature
(ThoUimit). Therefore, when the control unit (5) detects that the limit winding (AS or YS) temperature (ThoUimit) is exceeded successively, the motor (2) is kept waiting for a longer time period (tn + t) than the previous waiting period (tn).
[0024] In another embodiment of the present invention, the control unit (5) alerts the user by completely turning off the compressor (1 ) if the motor (2) is kept waiting for successive number (N) of cycles prerecorded in the memory thereof by the producer due to the calculated winding (AS or YS) temperature (Thot_as or ThoLys) being high in the previous operation. Keeping the motor (2) waiting for numerous times successively due to the winding (AS or YS) temperature (Thot_as or ThoLys) exceeding the limit winding (AS or YS) temperature (Thot_limit) shows that there is a malfunction in the winding (AS or YS) or the compressor (1 ). Therefore, the control unit (5) stops the compressor (1 ) and alerts the user when such a condition is detected. Consequently, the compressor (1) is prevented from operating in a manner that adversely affects its safety.
[0025] In the compressor (1 ) of the present invention, the winding (AS or YS) temperatures (Thot_as or ThoLys) are detected by the motor (2) being connected to the AC-DC converter (8) and the resistance (Rhot_as or RhoLys) of the winding (AS or YS) of which the temperature will be measured being calculated precisely by means of the amplifier (6).
Consequently, the control unit (5) keeps the motor (2) waiting until getting to below the limit winding temperature (ThoLlimit) and prevents the compressor (1 ) from being damaged if the detected winding (AS or YS) temperature (Thot_as or ThoLys) is above the limit winding (AS or YS) temperature (ThoLlimit).
[0026] It is to be understood that the present invention is not limited to the
embodiments disclosed above and a person skilled in the art can easily introduce different embodiments. These should be considered within the scope of the protection postulated by the claims of the present invention.

Claims

Claims
1. A variable speed hermetic compressor (1 ) providing the refrigerant cycle to be performed, comprising a motor (2) fed by the mains voltage (Vac), a main winding (AS), an auxiliary winding (YS), a first switch (3) connected in series to the auxiliary winding (YS) providing the motor (2) to be operated by being actuated at the start up so that the motor (2) can start up, a second switch (4) connected in series to the main windings (AS) providing the motor (2) to continue operating, and a control unit (5) that controls the start up and operation of the motor (2) by actuating the switches (3 and 4) when required, characterized by
- an AC-DC converter (8) disposed on the line between the motor (2) and the mains voltage (Vac), providing the mains voltage (Vac) to be converted to digital voltage (Vdc),
- a voltage amplifier (6) installed between the motor (2) and the AC-DC converter (8),
- a third switch (7) disposed in the line between the motor (2) and the AC-DC converter (8), providing the motor (2) to be fed with digital voltage (Vdc) by the control unit (5) changing the position thereof when the motor (2) stops.
2. A compressor (1 ) as in Claim 1 , characterized by the control unit (5) that, in order to measure the temperature (Thot_as or Thot_ys) on the windings (AS or YS),
- cuts off the line whereby the motor (2) is fed from the mains voltage (Vac) by changing the position of the third switch (7) and provides the motor (2) to be connected to a digital supply source (Vdc),
- reads the digital voltage (Vdcs) passing thereon through the amplifier (6) by turning off the switch (3 or 4) of the winding (AS or YS) the temperature (Thot_as or Thot_ys) of which will be measured and calculates the resistance (Rhot_as or Rhot_ys) of the winding (AS or YS) and
- calculates the temperature (Thot_as or Thot_ys) of the winding (AS or YS) by comparing the resistance (Rcold) of the winding (AS or YS) prior to operation of the motor (2) with the resistance (Rhot) measured after the motor (2) is deactivated and connected to the digital voltage (Vdcs) source.
3. A compressor (1 ) as in Claim 1 or 2, characterized by the control unit (5) that does not operate the motor (2) for a time period (t1 ) prerecorded in the memory thereof by the producer if the winding (AS or YS) temperature
(Thot_as or Thot_ys) calculated is greater than the limit winding (AS or YS) temperature (Thot_limit) predetermined by the producer and recorded in the memory thereof.
A compressor (1 ) as in any one of the above Claims, characterized by the control unit (5) that does not operate the motor (2) for a longer time period (tn + t) than the previous waiting period (tn) if the winding (AS or YS) temperature (Thot_as or Thot_ys) exceeds the limit temperature (Thot_limit) again when the motor (2) is stopped once again after the motor (2) is kept waiting for some time (tn) and re-operated since the calculated winding (AS or YS) temperature (Thot_as or Thot_ys) has exceeded the limit temperature (Thot_limit).
A compressor (1 ) as in any one of the above Claims, characterized by the control unit (5) that alerts the user by completely turning off the compressor (1 ) due to the winding (AS or YS) temperature (Thot_as or Thot_ys) calculated in the previous operation of the motor (2) being high if the motor (2) is kept waiting for a successive number (N) of cycles prerecorded in the memory thereof by the producer.
PCT/EP2010/070739 2009-12-31 2010-12-24 A hermetic compressor the winding temperature of which is measured WO2011080240A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR200910080 2009-12-31
TRA2009/10080 2009-12-31

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WO2011080240A3 WO2011080240A3 (en) 2011-12-15

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Citations (3)

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US20030097849A1 (en) 2001-11-29 2003-05-29 Yukihiko Taguchi Control unit for clutchless, variable displacement compressor
KR20040064493A (en) 2003-01-13 2004-07-19 엘지전자 주식회사 Overload protective device of reciprocating compressor and method thereof
EP1803936A1 (en) 2005-12-27 2007-07-04 WABCO GmbH Compressor and method for determining the ambient temperature of the compressor

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US20030111976A1 (en) * 2001-12-13 2003-06-19 Kumar Ajith Kuttannair Detection of loss of cooling air to traction motors
ES2366482T3 (en) * 2005-12-29 2011-10-20 Arçelik Anonim Sirketi ENGINE.
US7952318B2 (en) * 2007-06-04 2011-05-31 Eaton Corporation System and method for determining stator winding resistance in an AC motor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030097849A1 (en) 2001-11-29 2003-05-29 Yukihiko Taguchi Control unit for clutchless, variable displacement compressor
KR20040064493A (en) 2003-01-13 2004-07-19 엘지전자 주식회사 Overload protective device of reciprocating compressor and method thereof
EP1803936A1 (en) 2005-12-27 2007-07-04 WABCO GmbH Compressor and method for determining the ambient temperature of the compressor

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