JP2007159192A - Brushless motor, and sealed compressor equipped with it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brushless motor which greatly contributes to the efficiency improvement of freezing cycle, being able to sharply reduce the quantity of discharged oil, and to provide a sealed compressor which is equipped with it. <P>SOLUTION: It is provided, on an insulator, with a coil end guide 20 which isolates a coil end and space upper the coil end, and also the coil end guide is provided with a connecting end plate which has a function of holding a lead wire 30, connecting and wiring a coil terminal wire. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a small brushless motor and a hermetic compressor mounted on various devices of an air conditioner.

  The ratio of air conditioners to the total power consumption is large, and the pursuit of high efficiency and energy saving is an essential proposition as the preservation of the global environment is called out. As a means to save energy in air conditioners, the most important issue is to improve the efficiency of the enclosed compressors. The major components for this are to improve the efficiency of the motor itself and the control circuit. One is to increase the efficiency of the compression mechanism.

  In order to increase the efficiency of electric motors, the copper loss has been greatly reduced through the transition from a stator with a distributed winding coil using the inserter winding method to a stator with a salient-pole coil using the inner direct winding method. .

  The marked difference between the distributed winding coil specification by the inserter winding method and the salient pole winding coil specification by the inner type direct winding method is in the coil end shape. In the case of the conventional distributed winding coil specification shown in FIG. 17, the coil extending between the slots forms a high layered coil end 12, and the coil end 12 is raised from the fixed stator core surface to secure an insulating space. It is a hotbed with unnecessary copper loss. On the other hand, in the case of the salient pole winding coil specification shown in FIG. 16, the coil end 12 itself has a protruding coil end shape that exists only in each tooth portion 102, and is wound in a shape that is in close contact with the tooth portion 102 due to the presence of the insulator 13. The amount of the wound coil is reduced.

  To improve the efficiency of the compression mechanism, the efficiency of the refrigeration cycle is improved by structurally separating the discharged refrigerant gas and oil structurally and reducing the amount of oil discharged to the outside of the hermetic seal while reducing structural mechanical loss. (See, for example, Patent Document 1).

  FIG. 18 shows an example of structural isolation in a hermetic compressor. The refrigerant gas discharged from the compression mechanism 51 passes through the rotor lower chamber 53 while passing through the stator 101 and the rotor 11 from the rotor upper chamber 52, and to the stator upper portion 54 while passing through the stator outer peripheral portion 56. It escapes and is discharged to the outside. On the other hand, the oil for device lubrication is supplied to each rotary bearing portion and then discharged to the rotor upper chamber 52, passes through the rotor, and returns to the lower oil sump. For this reason, in the path from the rotor upper chamber 52 to the rotor lower chamber 53, the problem is how to reduce the oil discharge amount by repeatedly applying collision separation and centrifugal separation. For this purpose, a passage cover 57 and a passage cover film 571 for isolating the rotor upper chamber 52 are provided to isolate the stator upper chamber 54 serving as a refrigerant gas passage. Further, in order to cope with the unique coil end of the concentrated winding type, a method of isolating the passage by an isolation wall covering the outer periphery and upper part of the coil end and improving the gas-liquid separation action is also disclosed (for example, see Patent Document 2). .

On the other hand, in the manufacture of electric motors, the coil end wire connection processing and lead wire lead-out structure in the stator winding are the key to stator quality, and a stable connection method and insulation structure are required. A connection end plate is also proposed which is formed on a coil end in combination with an insulator to form a structure (for example, Patent Document 3). Regarding the structure such as the connection end plate, the existence itself is related to the passage of the discharged refrigerant gas at the coil end, and therefore an example in which the refrigerant gas passage is secured as an end plate shape is also disclosed ( For example, Patent Document 4).
JP 2002-115686 A JP 2004-270668 A JP 2003-158846 A JP 2002-44896 A

  In order to improve the efficiency of the refrigeration cycle, the separation of refrigerant gas and oil and the isolation of passages in the hermetic seal are important points. Among them, the passage cover for isolating the rotor upper chamber plays an important role in isolation. As the function of the passage cover, high-temperature and high-pressure refrigerant gas directly collides with the passage cover at high speed, so durability and rigidity including heat resistance are required and materials have been examined. However, the disclosed passage cover for isolating the rotor upper chamber is premised on a layered high coil end of a distributed winding specification by a conventional inserter winding method, and in order to avoid scratches due to contact with the coil, etc. The mechanism is limited to a film-like shape such as a film, and functions by being integrated with a high coil end.

  However, as described above, the situation as a structural support has changed with the small coil end shape of the salient pole winding specification with a lot of space, and there is a possibility that the conventional passage cover cannot perform a sufficient isolation function. There is. Also, the isolation wall that covers the outer periphery and upper part of the coil end that is disclosed for salient pole winding is premised on the functional cooperation with the film-shaped passage cover, and as described above, it does not function sufficiently. there is a possibility.

  On the other hand, the gas-liquid separation action by colliding refrigerant gas containing oil using the rotation of the rotor is also an important means for improving the efficiency of the refrigeration cycle. It is not presented as a means corresponding to.

  Currently, salient pole winding type stators are becoming the mainstream, and there is a demand for a structure that can sufficiently generate an isolation function and a gas-liquid separation function corresponding to the coil end space of the salient pole winding specifications.

  In addition, in the manufacture of motor stators, rational coil terminal wire processing has a large cost problem and has been a long-standing problem in stator windings. If it is formed as an end plate, the cost weight is too large and the feasibility is reduced. As a structure having a composite function linked with other functions, a rational solution based on improvement in function and performance is required.

  The present invention aims to solve the above problems.

  In order to solve the above-described problem, according to the first aspect of the present invention, an annular yoke, a plurality of teeth disposed on an inner peripheral portion of the yoke, and an inner diameter side tip of the teeth are formed. And an open slot type stator core formed from a wide portion of the teeth, a slot insulator disposed on the wall surface of the slot, and an insulator disposed on the end surface of the stator core, and is directly saliently wound around the teeth. A brushless motor comprising a stator comprising a coil and a rotor, wherein a coil end guide for separating a coil end and a coil end upper space is provided on the insulator. Yes, providing isolation function and gas-liquid separation function for salient pole coil ends.

The invention according to claim 2 is the brushless motor according to claim 1, wherein the coil end guide is provided on the coil end side having the lead wire of the stator. The coil end isolation function and gas-liquid separation function corresponding to the coil end are provided.

  According to a third aspect of the present invention, in the brushless motor according to the first aspect, the coil end guide is provided on the coil end opposite to the coil end having the stator lead wire. Yes, it provides a coil end isolation function and a gas-liquid separation function on the side opposite to the coil end on the side having the lead wire corresponding to the salient pole winding type coil end.

  According to a fourth aspect of the present invention, the coil end guide is provided on both the coil end having the lead wire of the stator and the coil end on the opposite side. It provides an isolation function and a gas-liquid separation function corresponding to the coil end of the salient pole winding specification.

  According to a fifth aspect of the present invention, the coil end guide has an inner diameter side protrusion corresponding to the inner diameter side coil end shape. , Providing isolation function and gas-liquid separation function corresponding to the inner diameter side coil end shape of salient pole winding specification.

  According to a sixth aspect of the present invention, the coil end guide is provided with a connection end plate having a function of connecting and wiring the coil terminal wire and holding the lead wire. The brushless motor according to claim 4 or 5, which provides an isolation function and a gas-liquid separation function corresponding to the coil end shape of the salient pole winding specification, and also provides a coil terminal line processing and a lead wire holding function.

  According to the invention which concerns on Claim 7, the conducting wire for coils which has a wire diameter more than the coil wire diameter used for a stator for the wiring of the coil end line in the said connection end plate and the wiring of a lead wire was used, It is characterized by the above-mentioned. The brushless motor according to claim 6, which provides a separation function and a gas-liquid separation function corresponding to a coil end shape of a salient pole winding specification, a coil terminal wire processing and a lead wire holding function, and a low cost Provide wiring and lead means.

  According to an eighth aspect of the present invention, the connection end plate is provided with a passage for guiding the wiring between the coil terminal wires and the lead wire, which has an interphase insulation function. The brushless motor according to Item 7, which provides an isolation function and a gas-liquid separation function corresponding to the coil end shape of the salient pole winding specification, and also has a coil terminal wire processing and a lead wire holding function that ensure an interphase insulation function. provide.

  The invention according to claim 9 is a hermetic compressor in which the brushless motor according to any one of claims 1 to 8 is incorporated, and the coil end of the stator with salient pole winding specifications. In addition to providing an isolation function and a gas-liquid separation function corresponding to the shape, it provides an inter-phase insulation function and provides a stable coil terminal wire processing and lead wire holding function.

  According to the invention of the present application, by providing the isolation wall having the structural base as the stator corresponding to the upper and lower stators of the salient pole winding specification, sufficient isolation of the passage for the refrigerant gas and the size necessary for the passage are provided. The refrigeration cycle can greatly reduce the oil discharge rate because it can provide a highly durable structure that can fully demonstrate the oil-liquid separation function using the rotation of the rotor. It is possible to provide a brushless motor that greatly contributes to the improvement of efficiency.

In addition, according to the invention of the present application, since the coil terminal wire processing and the lead wire holding function that secure the interphase insulation function can be realized by using the structure having the isolation function, the structure and quality are stable. A brush motor can be provided.

  Further, according to the invention of the present application, by incorporating the brushless motor into the hermetic compressor, a hermetic compressor with high refrigeration cycle efficiency, high efficiency and high insulation quality can be provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 2 shows a cross-sectional view of a hermetic compressor incorporating the electric motor of the present invention. The assembled stator finished product 10 shows an example in which the coil end guide 20 is incorporated in the lead side coil end 121 of the present invention. The hermetic compressor 50 has a compression mechanism 51 on the upper side, and the lead wire connection is also on the upper side.

  FIG. 3 is a cross-sectional view showing a combination of the stator 101 and the coil end guide 20. The coil end guide 20 includes a cylindrical guide 21 that isolates the rotor upper chamber 52 and the stator upper chamber 54 in the hermetic compressor 50, and a coil end upper plate 22 that isolates the stator upper chamber 54 and the stator 101. And a coil end outer wall 231 that separates the stator outer peripheral portion 56 and the lead side coil end 12 and an inner diameter side protrusion 24 that performs inner diameter side isolation corresponding to the inner diameter side shape of the insulator 13 on the stator inner diameter side.

  The insulator 13 and the coil end guide 20 are fitted to each other by fitting the insulator outer peripheral portion 131 and the coil end outer wall 231 so that the isolation function with respect to the stator outer peripheral portion 56 is made dense and the stator 101 is fitted. The concentricity with the stator 101 is obtained by combining with the insulator 13. As a result, the assembled position accuracy and rigidity of the compression mechanism 51 as the upper mechanism in the hermetic compressor 50 are ensured, and the function of the cylindrical guide portion 21 of the coil end guide 20 can be sufficiently exhibited. Yes. Further, as shown in FIG. 4, fixing mechanisms such as hook claws A132 and hook claws B232 are provided at several locations on the insulator outer peripheral portion 131 and the coil end outer wall 231 to secure the coil end guide 20 to the stator 101. ing.

  FIG. 5 shows a nozzle locus 60 through which the nozzles of the inner nozzle winding pass. Usually, the trajectory when passing the upper part of the inner diameter side guide 134 of the insulator is determined at a position as close to the final coil end shape as possible. This is because if a locus with a margin is taken, slack occurs at the initial stage when the coil is wound around the tooth portion, and the slack creates overlapping of the coils, resulting in a final thickened state. However, since the inner diameter guide 134 of the insulator exists, the shape of the inner diameter guide 134 needs to consider the nozzle locus 60.

  Since the shape of the inner diameter side guide 134 is regulated as described above, an inter-guide space 135 is generated by the inner diameter side guide 134 and the wedge 14 as a structure peculiar to the salient pole winding as shown in FIG. A refrigerant gas passage passing through the stator 101 is formed. The inner diameter side protrusion 24 of the coil end guide 20 is formed corresponding to the shape of the inter-guide space 135. The passage of a certain amount of refrigerant gas is necessary as a cooling function for the coil by passing through the slot. However, excessive passage impedes the separation of refrigerant gas and oil, so that a certain flow rate regulation is necessary. This flow restriction can be controlled by the degree of occupation of the inner diameter protrusion 24 in the inter-guide space 135.

With the coil end guide 20 having the above structure, the refrigerant gas and oil discharged from the compression mechanism 51 are guided to the stator inner diameter and the rotor 11 from the rotor upper chamber 52, and the oil is generated while causing gas-liquid separation by collision. And a part of the refrigerant gas is introduced into the stator 101 to produce a coil cooling effect. Refrigerant gas that has passed from the rotor lower chamber 53 through the stator lower chamber 55 passes through the stator outer peripheral portion 56 and escapes to the stator upper chamber 54 while being isolated by the coil end guide 20, and is discharged to the outside of the compressor. .

  By providing the coil end guide 20 having the stator 101 as a structural base, it is possible to provide a highly durable structure including heat resistance against direct collision of high-temperature and high-pressure refrigerant gas, and sufficient passage for the refrigerant gas. Therefore, it becomes possible to set the necessary size for the isolation and passage, and the oil discharge amount of the refrigerant gas can be greatly reduced.

  FIG. 7 shows an example in which a coil end guide 20 is provided on the anti-lead side coil end 122 of the stator. This is an example of the case where the non-lead side is positioned below the stator. This function is necessary for refrigerant gas containing oil that has passed through the stator and rotor from the compression mechanism on the upper side of the compressor. A function different from the coil end guide on the side is required.

  As described in the first embodiment, the refrigerant gas containing oil is separated from the rotor upper chamber 52 to the stator inner diameter and the rotor 11 while the oil is separated by gas-liquid separation by collision while passing. Come. Then, the refrigerant gas containing oil that has passed to the rotor lower chamber 53 obtains centrifugal force by the additional function of the rotor 11, and the inner diameter side guide 134 and the wedge 14 of the non-lead side coil end 122, and in this case, the embodiment. Unlike 1, the inner diameter wall substantially shielded by the inner diameter protrusion 24 having a shape in which the space 135 between the guides is filled without forming a passage is formed, so that collision and gas-liquid separation are efficiently promoted.

  On the other hand, the refrigerant gas containing oil partially reaches the stator 101 and reaches the non-lead-side coil end 122 while exhibiting a coil cooling effect. The refrigerant gas that has passed through the non-lead-side coil end 122 hits the coil end upper plate 22 and the coil end outer wall 231 and causes gas-liquid separation to reach the stator lower chamber 55 through the upper plate through hole 221.

  The refrigerant gas separated from the gas and liquid through the rotor lower chamber 53 as described above merges with the refrigerant gas separated from the gas and liquid through the anti-lead side coil end 122 to the stator lower chamber 55 as described above. Then, it passes through the stator outer peripheral portion 56 to the stator upper chamber 54 and is discharged to the outside of the compressor. The coil end guide 20 exhibits the isolation function which prevents the dissipation of the refrigerant gas while containing oil as well as the role of the gas-liquid separation function as the collision wall.

  Combined use of the anti-lead-side coil end guide and the lead-side coil end guide provides sufficient isolation of the passage between the refrigerant gas containing oil and the refrigerant gas separated into gas and liquid, and the rigidity required for oil separation A certain shielding wall can be installed at an appropriate location, and the oil discharge amount of the refrigerant gas can be greatly reduced, which greatly contributes to the improvement of the efficiency of the hermetic compressor.

  FIG. 1 shows the completion of a stator provided with a connection end plate having a function of connecting and wiring coil terminal wires and holding lead wires as a combined function of the coil end guide 20 incorporated in the lead side coil end 121 of the present invention. An overview of product 10 is shown. The coil end upper plate 22 and a part of the coil end outer wall 231 which constitute the constituent parts of the coil end guide 20 are used, and the function of connecting and wiring the coil terminal wires and holding the lead wires 30 is incorporated.

FIG. 8 shows a 4-pole parallel connection specification of a stator having 6 slots. Of the 12 terminal lines of 6 coils, neutral points are formed at 2 locations, 3 each, and the remaining 2 terminal wires of each phase are used as power connection terminals for each phase. Connect to box 27. Further, the lead wire 30 is wired separately to the power supply terminal box 27.

  FIG. 9 shows a plan view of a coil end guide 20 having an end plate function for connecting and wiring the coil terminal wires of the present invention and holding the lead wires. FIG. 10 is an external view of a single lead wire 30 before being incorporated into the coil end guide 20.

  In FIG. 10, each phase lead wire 30 is composed of two coil lead wires 31, and the lead wire diameter is larger than the coil lead wire diameter used for the stator 10. The lead wire 30 is covered with an insulating tube 32 for interphase insulation. Each of the insulating tubes 32 is defined to a minimum necessary length, and is assembled to the coil end guide 20 as shown in FIG. 9 so that the interphase insulating function is formed on the coil end guide 20. 26 will be taken over. Two of the coil conductors 31 of each phase guided by the interphase insulation guide 26, a total of six, are wired at a total of six locations, one for each power terminal box 27 to which each phase terminal wire is connected. Temporarily fixed.

  In order to establish the interphase insulation structure of the lead wires 30 of each phase, a three-phase crossing structure is adopted at the point where the coil conductors 31 of each phase intersect in the wiring to the power supply terminal box 27 of each phase, and the coils of different phases We try not to touch each other. As shown in FIG. 11, for example, the R-phase coil conductor 31 </ b> R is guided to the power supply terminal box 27 through the other S-phase coil conductor 31 </ b> S and the T-phase coil conductor 31 </ b> T.

  Further, in order to secure the final fixing of the lead wire 30 to the stator final product 10, a bending hook 28 as shown in FIG. 12 is provided, and the stator is used while utilizing the rigidity with respect to the bending of the coil conductor 31 and the insulating tube 32. Positioning and holding function of the lead wire rising with respect to 10.

  FIGS. 13, 14 and 15 sequentially show the terminal line processing steps for assembling the coil end guide 20 having the end plate function to the stator 101. FIG. The stator 101 in FIG. 13 has already been routed to the neutral point terminal box 132 provided on the insulator outer peripheral portion 131 as a neutral point end line process, and the short circuit triple terminal 16 is press-fitted to finish the process. 6 of the power connection terminal lines 15 are left unprocessed. In FIG. 14, the coil end guide 20 is integrated with the stator by fitting and hooking claws A132 and hooking claws B232 of the insulator outer peripheral portion 131 and the coil end outer wall 231, and then the power connection terminal wire 15 is connected to the power terminal box 27. Pull around and fix temporarily. In FIG. 15, the finished stator 10 with lead wires is obtained by press-fitting the short-circuit terminals 24.

  In manufacturing the stator, the terminal wire connection process and the lead wire assembling process are the most manual in terms of quality and therefore have many problems. Moreover, it becomes a work in a normal process and becomes a neck process which lengthens a manufacturing process. The coil end guide having an end plate function of the present invention has a structure that can be easily prepared outside the manufacturing process, so that it is possible to ensure the quality of bonding, insulation, etc. Due to the use of inexpensive materials due to the formation of the insulating structure, the cost issue is large, and what has been a long-standing issue in the stator winding can be rationally solved as a structure with a combined function linked to other functions It will be possible.

The brushless motor according to the present invention and the hermetic compressor including the same can greatly reduce the oil discharge amount when the salient pole winding type stator is adopted, and can also provide insulation between the coil terminal wire processing and the lead wire holding. High reliability in quality and safety can be ensured, so salient pole winding is becoming mainstream, and it can be installed in hermetic compressors and other equipment that require excellent quality including insulation. Useful for this.

External view of the finished stator of the present invention Sectional view of a hermetic compressor incorporating the electric motor of the present invention Partial sectional view of the coil end guide assembled to the stator Partial external view of the hook claw of the coil end guide Nozzle locus diagram of inner nozzle winding Partial view from the inner diameter side of the coil end guide assembled to the stator Partial sectional view with coil end guide on the non-lead side Connection diagram showing 6-slot 4-pole parallel connection specifications The top view of the coil end guide which has an end plate function of this invention External view of lead wire The figure which shows the three-dimensional structure of the wiring in the coil end guide which has an end plate function of this invention The figure which shows the hook for lead wire bending in the coil end guide which has an end plate function of this invention The figure which shows the assembly | attachment terminal line connection process 1 to the stator of this invention The figure which shows the assembly | attachment terminal line connection process 2 to the stator of this invention The figure which shows the assembly | attachment terminal line connection process 3 to the stator of this invention External view of salient pole type stator External view of stator with distributed winding specifications Cross section of a conventional hermetic compressor

Explanation of symbols

10 Stator Finished Product 101 Stator 102 Teeth Part 11 Rotor 12 Coil End 121 Lead Side Coil End 122 Anti-Lead Side Coil End 13 Insulator 131 Insulator Outer Part 132 Hook Claw A
133 Neutral point terminal box 134 Inner diameter side guide 135 Space between guides 14 Wedge 15 Terminal wire for power connection 16 Short-circuited triple terminal 20 Coil end guide 21 Cylindrical guide 22 Coil end upper plate 221 Upper plate through hole 231 Coil end outer wall 232 Hook Claw B
24 Inner diameter side protrusion 25 Short-circuit terminal 26 Interphase insulation guide 27 Power supply terminal box 28 Bending hook 30 Lead wire 31 Coil conductor 31R R phase coil conductor 31S S phase coil conductor 31T T phase coil conductor 32 Interphase insulation tube DESCRIPTION OF SYMBOLS 50 Hermetic compressor 51 Compression mechanism 52 Rotor upper chamber 53 Rotor lower chamber 54 Stator upper chamber 55 Stator lower chamber 56 Stator outer periphery 57 Passage cover 571 Passage cover film 60 Nozzle locus

Claims (9)

An open slot type stator core formed of an annular yoke, a plurality of teeth disposed on the inner peripheral portion of the yoke, and a wide tooth portion formed at the inner diameter side tip of the teeth, and a wall surface of the slot In a brushless motor comprising a stator comprising a slot insulator disposed in a coil and a coil directly saliently wound around the teeth via an insulator disposed on an end surface of the stator core, and a rotor,
A brushless motor, wherein a coil end guide for separating a coil end and a coil end upper space is provided on the insulator. 2. The brushless motor according to claim 1, wherein the coil end guide is provided on a coil end side having a lead wire of the stator. The brushless motor according to claim 1, wherein the coil end guide is provided at a coil end opposite to a coil end having a lead wire of a stator. 2. The brushless motor according to claim 1, wherein the coil end guides are provided at both a coil end having a lead wire of a stator and an opposite coil end. The brushless motor according to claim 1, wherein the coil end guide has an inner diameter side protrusion corresponding to an inner diameter side coil end shape. 6. The non-printing brush according to claim 2, wherein the coil end guide is provided with a connection end plate having a function of connecting and wiring a coil terminal wire to hold a lead wire. Electric motor. 7. The brushless motor according to claim 6, wherein a coil lead wire having a wire diameter equal to or larger than a coil wire diameter used for a stator is used for wiring between the coil terminal lines and the lead wire in the connection end plate. . 8. The brushless motor according to claim 6, wherein a passage for guiding the wiring between the coil terminal wires and the lead wire having an interphase insulation function is provided in the connection end plate. 9. 9. A hermetic compressor incorporating the brushless motor according to any one of claims 1 to 8.

Images