JP5045404B2 - Hermetic compressor - Google Patents

Description

  The present invention relates to a hermetic compressor used in a refrigeration cycle such as a refrigerator-freezer.

  In recent years, for example, a hermetic compressor used in a refrigeration apparatus such as a domestic refrigerator-freezer is strongly desired to have a higher power consumption reduction effect. In response to such demands, some conventional hermetic compressors employ salient pole concentrated winding motors as more efficient motors (see, for example, Patent Document 1).

  Hereinafter, the conventional hermetic compressor will be described with reference to the drawings.

  FIG. 9 is a longitudinal sectional view of a conventional inverter-controlled hermetic compressor described in Patent Document 1, and FIG. 10 is a top view of a motor stator of the conventional hermetic compressor. 11 is a cross-sectional view of a main part of a motor stator of a conventional hermetic compressor, and FIG. 12 is a winding connection diagram of the motor stator of the conventional hermetic compressor.

  9 and 10, an airtight container inner space 2 inside the airtight container 1 is driven by an electric element 5 including a stator 3 and a rotor 4 incorporating a permanent magnet (not shown), and the electric element 5. The compression element 6 to be accommodated. The electric element 5 is connected to an inverter drive circuit (not shown) via the terminal portion 7.

  The stator 3 of the electric element 5 includes a winding 3b wound around the tooth portion 3a, and the winding 3b wound around the tooth portion 3a has a phase of U phase, V phase, and W phase. It is divided into two parts.

  11 and 12, one end of each of the U phase, the V phase, and the W phase is coupled at the terminal portion 7, and the other end is coupled at the neutral point 3 c.

  Since the cross-sectional shape is round and the cross-sectional area is the same, the winding 3b is arranged with a gap 3d between the windings 3b when winding.

  The operation of the hermetic compressor configured as described above will be described below.

In the operation of the hermetic compressor, first, a predetermined operation frequency and power supply are output to the rotor 4 of the electric element 5 by an inverter drive circuit (not shown). The rotor 4 of the electric element 5 is rotated by the applied voltage from the inverter drive circuit to drive the compression element 6, and the compression element 6 can suck and compress the refrigerant from the refrigeration cycle.
JP 2002-70740 A

  However, in the conventional hermetic compressor, since a large gap is generated between the windings 3b wound around the stator 3 of the electric element 5, a sufficient space factor cannot be secured, so that the motor efficiency is improved. In particular, there was a problem that the power consumption could not be sufficiently reduced, especially during the low-rotation operation that most affected the power consumption of a refrigerator or the like.

  The present invention solves the above-described conventional problems, and provides a highly efficient hermetic compressor that can increase the efficiency particularly in the low-rotation operation region and further increase the effect of reducing the power consumption of the cooling system. Objective.

  In order to solve the above-described conventional problems, the hermetic compressor according to the present invention improves the space factor of the winding by reducing the gap between the windings wound around the stator of the electric element, thereby improving the motor. Since the efficiency can be improved, the efficiency of the hermetic compressor is improved, and the power consumption in the refrigeration cycle such as a refrigerator can be effectively reduced.

  The hermetic compressor according to the present invention improves the motor efficiency by improving the space factor of the stator winding, and in particular, improves the efficiency in a low-speed operation region that is easily affected by a reduction in efficiency due to fixed loss. The power consumption in the refrigeration system can be effectively reduced.

The present invention includes a compression element and an electric element that drives the compression element, the electric element having a rotor embedded with a permanent magnet, and a concentrated winding stator in which windings are concentratedly wound on a tooth portion provided in a core. In addition, each phase of the U phase, V phase, and W phase wound around the tooth portion is wound by arranging windings having different cross-sectional areas in each tooth portion, and winding gaps having large cross-sectional areas are arranged. Since windings with a small cross-sectional area are arranged, minimizing the gaps between the windings can increase the space factor of the motor windings and improve the motor efficiency. A high hermetic compressor can be provided, and power consumption in a low rotation range in the refrigeration cycle can be effectively reduced.

Further, according to the present invention , each phase of the U phase, the V phase, and the W phase is wound around each tooth portion while changing the cross-sectional area of each one winding, and a single type of winding is used. By changing the tensile strength (tension) at the time of winding, winding can be performed while changing the cross-sectional area of the winding as appropriate, and the gap generated between the windings can be minimized. there is no need to wind while combining a plurality of windings, in the step of winding the windings, or combine different winding cross-sectional area, step or switching the winding is not required, with facilities for winding simultaneously It can be simplified, productivity can be improved, and production cost can be reduced.

Further, according to the present invention, each of the U phase, the V phase, and the W phase is formed by winding a plurality of windings having different cross-sectional areas around each tooth portion. Since windings with different cross-sectional areas that can reduce the generated gap are wound, by minimizing the gap between windings for each phase, the space factor of the motor winding is improved, and the motor efficiency Can be improved.

Further, according to the present invention, the cross-section of the winding having a large cross-sectional area is circular, the cross-section of the winding having a small cross-sectional area is a substantially triangular shape, and the adjacent cross-section between the windings having a circular shape is wound. Since windings having a substantially triangular cross section can be arranged and wound in the triangular gap generated in the winding, the gap between the wound windings can be reduced. The space factor can be improved, and the motor efficiency can be improved.

In the present invention, the concentrated winding stator is a concentrated winding around the teeth part while heating the winding to a room temperature or higher. When winding, the winding is heated and softened. Winding while pulling can prevent the coating protecting the winding from being damaged or cause insulation failure, and change the winding cross-sectional area to reduce the gap between windings. Therefore, the reliability can be improved, the space factor of the motor winding can be further improved, and the motor efficiency can be improved.

Further, according to the present invention, the electric element is driven by an inverter at a plurality of operating frequencies, and the rotor is rotated at a rotational speed of at least 23 rps or less, so that the motor can be operated at a low speed with a smaller motor input work. Combined with the improvement in motor efficiency due to the improvement in the line space factor, the power consumption can be further reduced.

Further, according to the present invention, the refrigerant compressed by the compression element is a hydrocarbon-based refrigerant. Even if the cylinder volume is increased and the motor input is increased as compared with the conventional compressor, the space factor of the motor winding is increased. The improvement can reduce the loss in the control circuit and the motor loss, so that the power consumption can be further reduced in the compressor using the refrigerant that is friendly to the global environment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a hermetic compressor according to Embodiment 1 of the present invention, and FIG. 2 is an enlarged view of a concentrated winding type stator used in the hermetic compressor of the same embodiment. FIG. 3 is a cross-sectional view of a main part of a winding winding portion of a stator of the hermetic compressor according to the embodiment, and FIG. 4 is a winding connection diagram of an electric element of the hermetic compressor according to the same embodiment. .

  1 to 4, in the sealed container space 102 inside the sealed container 101a of the hermetic compressor 101, an electric element 115 including a stator 113 and a rotor 114 incorporating a permanent magnet (not shown), The compression element 106 is driven by the electric element 115. The electric element 115 is connected to an inverter drive circuit (not shown) via the terminal portion 117.

  The stator 113 of the electric element 115 is provided with a winding 118 wound around a teeth portion 113a of a core (not shown), and the winding 118 wound around the teeth portion 113a includes a U phase and a V phase. And the W phase are separately wound to form a concentrated winding type stator.

  In addition, each phase winding includes a winding of a first winding 118a and a second winding 118b in each of the U phase, the V phase, and the W phase, one end being at the terminal portion 117 and the other end being at the other end. Of these, the first winding 118a is coupled to the first neutral point 113c, and the second winding 118b side is coupled to the second neutral point 113d.

  As shown in FIG. 3, the first winding 118a has a larger cross-sectional area than the second winding 118b, and the second winding 118b is provided so as to be interposed in a cross-sectional area close to the gap generated by the arrangement of the first winding 118a.

  The electric element 115 is driven by an inverter drive circuit at a plurality of operation frequencies including an operation frequency of less than 23 rps and an operation frequency of 80 rps or more. The refrigerant in the space inside the sealed container 101a used in the present compressor is a hydrocarbon refrigerant R600a which is a typical natural refrigerant having a low global warming potential.

  The operation of the hermetic compressor configured as described above will be described below.

  The rotor 114 of the electric element 115 outputs a predetermined operation frequency and power supply by an inverter drive circuit. The rotor 114 of the electric element 115 is rotated by the applied voltage, and the refrigerant from the cooling system is sucked and discharged from the compression element 106.

  3 and 4, the first winding 118 a and the second winding are provided for each of the U-phase, V-phase, and W-phase, respectively, with respect to the intervention of the winding 118 having a different cross-sectional area, which was impossible in the prior art. Since the second winding 118b is interposed with a cross-sectional area that matches the gap formed between the first windings 118a, the winding 118 can be wound without a gap in a limited space. The space factor of the coil | winding 118 wound around the teeth part 113a of the stator 113 of the electric element 115 can be improved.

  If the space factor can be improved, the ampere-turn is improved, so that the thrust constant of the motor is improved. As a result, the Joule heat loss can be reduced and the motor efficiency can be improved.

  As a result, it is clear that by reducing the current applied to the electric element 115, the circuit loss of the inverter and the like and the loss of the electrical components can be significantly reduced in addition to the Joule heat loss of the electric element 115. Since the efficiency of the hermetic compressor 101 during operation can be improved, an effect of reducing power consumption can be dramatically obtained, and a large energy saving effect can be obtained.

  In particular, in the inverter-driven household refrigerator, with the recent improvement in the heat insulation efficiency of the refrigerator, the intrusion of heat into the refrigerator has been drastically reduced, which is a low refrigeration compared to the high rotation operation that requires a high refrigeration capacity. The ratio of the operation time at the time of low rotation operation that can be covered by the capacity has become longer, and the energy saving effect by improving the motor efficiency is also great.

  From the above results, circuit loss and motor loss can be significantly reduced even when the cylinder volume is increased using R600a refrigerant or at ultra-low speed operation such as 23 rps or less, which is easily affected by load fluctuations. Power consumption can be dramatically reduced.

  In this embodiment, the winding 118 is divided into the first winding 118a and the second winding 118b. However, the winding 118 is formed only by the first winding 118a as in the prior art, and is heated when being wound. As a result, the winding 118 formed of an insulating film, copper, aluminum, or the like is softened. Therefore, when it is desired to reduce the cross-sectional area during winding, the tensile strength of the winding 118 is increased to reduce the winding cross-sectional area. Winding, conversely, when it is desired to increase the cross-sectional area, it is possible to interpose the windings with different cross-sectional areas shown in this embodiment by adjusting the tensile strength to be weak, and the same effect can be obtained. It is done.

(Embodiment 2)
FIG. 5 is a longitudinal sectional view of the hermetic compressor according to the second embodiment of the present invention, and FIG. 6 is an enlarged view of the concentrated winding type stator used in the hermetic compressor of the same embodiment. FIG. 7 is a cross-sectional view of a main part of a winding winding portion of the stator of the hermetic compressor according to the embodiment, and FIG. 8 is a winding connection diagram of an electric element of the hermetic compressor according to the embodiment. .

  5 to 8, in the sealed container space 202 inside the sealed container 201a of the hermetic compressor 201, an electric element 215 composed of a stator 214 and a rotor 214 containing a permanent magnet (not shown), The compression element 206 is driven by the electric element 215. The electric element 215 is connected to an inverter drive circuit (not shown) via the terminal portion 217.

  The stator 213 of the electric element 215 includes a winding 218 wound around a tooth portion 213a of a core (not shown), and the winding 218 wound around the tooth portion 213a includes a U phase and a V phase. And the W phase are separately wound to form a concentrated winding type stator.

  In addition, each phase winding includes a winding of a first winding 218a and a second winding 218b in each of the U phase, the V phase, and the W phase, one end of which is connected to the terminal portion 217, and the other end. The first winding 218a is coupled to the first neutral point 213c, and the second winding side 218b is coupled to the second neutral point 213d.

  From FIG. 7, 218a is the first winding, 218b is the second winding, and the second winding 218b is a triangular shape having three corners in accordance with the gap shape generated by the arrangement of the first winding 218a. Yes.

  The electric element 215 is driven by an inverter drive circuit at a plurality of operation frequencies including an operation frequency of less than 23 rps and an operation frequency of 80 rps or more. The refrigerant in the space in the sealed container 201a used in the present compressor is a hydrocarbon refrigerant R600a that is a typical natural refrigerant having a low global warming potential.

  The operation of the hermetic compressor configured as described above will be described below.

  The rotor 214 of the electric element 215 outputs a predetermined operation frequency and power supply by the inverter drive circuit. The rotor 214 of the electric element 215 is rotated by the applied voltage, and the refrigerant from the cooling system can be sucked and discharged from the compression element 206.

  In FIG. 7, the first winding 218a and the second winding 218b are respectively connected to the U-phase, the V-phase, and the W-phase with respect to the intervention of the winding 218 having a different cross-sectional area, which was impossible in the past. Since the winding 218 is provided, and the second winding 218b has a cross-sectional shape that matches the gap generated between the first windings 218a, here, the triangular second winding 218b having three corners is interposed, The winding 218 can be wound without a gap in a limited space, and the space factor of the winding 218 wound around the teeth portion 213a of the stator 213 of the electric element 215 can be improved.

  If the space factor can be improved, the ampere-turn is improved, so that the thrust constant of the motor is improved. As a result, the Joule heat loss can be reduced and the motor efficiency can be improved.

  As a result, it is clear that by reducing the current applied to the electric element 215, in addition to the Joule heat loss of the electric element 215, it is possible to significantly reduce the circuit loss of the inverter and the like, and the loss of the electrical equipment, etc. Since the efficiency of the hermetic compressor 201 during operation can be improved, the power consumption can be dramatically reduced, and a large energy saving effect can be obtained.

  In particular, in the inverter-driven household refrigerator, with the recent improvement in the heat insulation efficiency of the refrigerator, the intrusion of heat into the refrigerator has been drastically reduced, which is a low refrigeration compared to the high rotation operation that requires a high refrigeration capacity. The ratio of the operation time at the time of low rotation operation that can be covered by the capacity has become longer, and the energy saving effect by improving the motor efficiency is also great.

  From the above results, circuit loss and motor loss can be significantly reduced even when the cylinder volume is increased using R600a refrigerant or at ultra-low speed operation, such as 23 rps or less, which is easily affected by load fluctuations. In addition, the power consumption can be reduced.

  As described above, the hermetic compressor according to the present invention can reduce the Joule heat loss of the electric element and the inverter drive circuit during the low-speed rotation with high power consumption effect of the refrigerator. The efficiency of the machine can be improved, and it can be widely applied to the use of hermetic compressors such as air conditioners and vending machines with the same configuration.

1 is a longitudinal sectional view of a hermetic compressor according to Embodiment 1 of the present invention. Enlarged view of the concentrated winding stator used in the hermetic compressor of the same embodiment Sectional drawing of the principal part of the coil | winding winding part of the stator of the sealed compressor of the embodiment Winding diagram of electric element of hermetic compressor of the embodiment Vertical sectional view of a hermetic compressor according to Embodiment 2 of the present invention Enlarged view of the concentrated winding stator used in the hermetic compressor of the same embodiment Sectional drawing of the principal part of the coil | winding winding part of the stator of the sealed compressor of the embodiment Winding diagram of electric element of hermetic compressor of the embodiment Vertical section of a conventional inverter-controlled hermetic compressor Top view of a motor stator of a conventional hermetic compressor Sectional view of the main part of a motor stator of a conventional hermetic compressor Winding diagram of motor stator of conventional hermetic compressor

Explanation of symbols

101, 201 Hermetic compressor 106, 206 Compression element 113, 213 Stator 113a, 213a Teeth section 114, 214 Rotor 115, 215 Electric element 118, 218 Winding

Claims (6)

A compression element; and an electric element that drives the compression element. The electric element includes a rotor in which a permanent magnet is embedded, and a concentrated winding stator in which a winding is concentratedly wound around a tooth portion provided in a core. In addition, each of the U phase, the V phase, and the W phase wound around the teeth portion is wound by arranging the windings having different cross-sectional areas in the respective tooth portions, and winding arrangement gaps having a large cross-sectional area are arranged. A hermetic compressor in which windings having a small cross-sectional area are arranged, and the concentrated winding stator is concentratedly wound around the teeth portion while heating the windings to a room temperature or higher . A compression element; and an electric element that drives the compression element. The electric element includes a rotor in which a permanent magnet is embedded, and a concentrated winding stator in which a winding is concentratedly wound around a tooth portion provided in a core. In addition, each of the U phase, the V phase, and the W phase wound around the teeth portion is wound by arranging the windings having different cross-sectional areas in the respective tooth portions, and winding arrangement gaps having a large cross-sectional area are arranged. A hermetic compression is characterized in that windings having a small cross-sectional area are arranged, a cross-section of the winding having a large cross-sectional area is circular, and a cross-section of the winding having a small cross-sectional area is substantially triangular. Machine. 2. The hermetic compressor according to claim 1, wherein each of the U phase, the V phase, and the W phase is wound around each tooth portion while changing a cross-sectional area of each one winding. The hermetic compressor according to claim 1, wherein each of the U phase, the V phase, and the W phase is formed by winding a plurality of windings having different cross-sectional areas around each tooth portion. The hermetic compressor according to any one of claims 1 to 4 , wherein the electric element is driven by an inverter at a plurality of operating frequencies, and the rotor is rotated at a rotational speed of at least 23 rps or less. The hermetic compressor according to any one of claims 1 to 5 , wherein the refrigerant compressed by the compression element is a hydrocarbon refrigerant.