KR20170035743A - Electrically driven compressor with electric connecting means and a stator assembly for the same - Google Patents

Abstract

The present invention relates to an electric compressor with an electrical connection means. According to an aspect of the present invention, an electric compressor comprises: a compression mechanism for compressing a working fluid; a transmission mechanism for driving the compression mechanism; a housing having a partition wall partitioning a space in which the transmission mechanism is housed; a plurality of energizing pins that are electrically connected to the transmission mechanism and are disposed to penetrate the partition wall; a fixing plate having the plurality of energizing pins fixed thereto and having an opposing surface facing the housing; and a control unit disposed on a back surface of the partition wall.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electric compressor having an electric connecting means, and a stator assembly for the electric compressor.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electric compressor having an electric connecting means and a stator assembly therefor, and more particularly to a compressor having a motor for driving a compressor.

The electric compressor refers to a compression mechanism for compressing a compression object in a housing and a compressor including a motor, which is a motor, for driving the compression mechanism. The motor compressor includes a power terminal for receiving power for driving a motor built in from the outside, and the power terminal includes a control unit provided in the compressor housing and a current-carrying pin for conducting current.

In the case of a compressor using a three-phase motor, the three energizing fins are provided, and generally three energizing fins are arranged side by side outside the stator. The energizing pin is arranged to protrude to the outside of the motor housing and is connected to a terminal provided in the control unit. Therefore, three through-holes through which the three energizing pins pass are formed in the motor housing.

On the other hand, the internal pressure of the compressor differs depending on the kind of refrigerant used. In the case of using a refrigerant such as CO ₂ , the refrigerating cycle is operated in the supercritical region. When the ultra-high-pressure refrigerant is used, the importance of the sealing is increased as compared with the case of not using the ultra-high-pressure refrigerant. If the three energizing fins are arranged side by side as described above, a very high stress may be applied to the region between the through holes.

Such high stresses cause deformation of the housing around the through-hole, resulting in a higher risk of refrigerant leakage.

In order to solve this problem, it is necessary to reinforce the rigidity such as changing the material of the motor housing or increasing the thickness of the housing, but this is not easy to apply because it causes an increase in production cost and weight.

In addition, normally, three through-holes are not formed individually but one large through-hole is formed, and a fixing plate in which three energizing pins are fixed in parallel is inserted. In such a configuration, the higher the pressure inside the compressor, the higher the possibility that the assembled fixed plate is disengaged.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electric compressor capable of sealing around a current-carrying pin to a sufficient degree regardless of a pressure inside a compressor.

Another object of the present invention is to provide an electric compressor capable of minimizing deformation applied to a compressor housing even if a high-pressure refrigerant is used.

Another object of the present invention is to provide a stator assembly for such a motor-driven compressor.

According to an aspect of the present invention, there is provided a compression mechanism for compressing a working fluid. A transmission mechanism for driving the compression mechanism; A housing having a partition for partitioning a space in which the transmission mechanism is housed; A plurality of energizing pins electrically connected to the power transmission mechanism and disposed through the partition walls; A fixing plate having the plurality of energizing pins fixed thereto and having opposed faces opposing the housing; And a control unit disposed on a back surface of the partition wall.

According to the aspect of the present invention, the energizing pin is fixed to the fixing plate opposed to the partition, and the fixing plate is brought into close contact with the partition by the pressure of the refrigerant inside the housing, so that sealing can be performed utilizing the pressure of the refrigerant .

Here, the transmission mechanism may include a stator fixed to the inner wall of the housing and a rotor rotatably disposed inside the stator, and the stator may be fixed to the stator.

Here, the cover may further include a cover having one side fixed to the stator and the other fixed to the other side.

Further, a fixing means for fixing the fixing plate to the partition wall may be additionally provided, and the fixing means may be disposed so as to be accessible from the inside of the housing.

Here, the fixing means includes a plurality of bolts, and the head of the bolt may be positioned inside the housing.

Further, a gasket may be provided between the fixing plate and the partition.

Here, the gasket may be provided with a plurality of openings through which the plurality of energizing fins are inserted.

Further, the plurality of energizing fins may be arranged such that one end portion is fixed to the fixing plate and the other end portion protrudes through the partition wall to the control unit side.

Further, an energizing means for electrically connecting the energizing pin and the coils provided in the stator may be provided.

Here, the energizing means may be fixed to the cover.

Here, the energizing means may be formed with an insertion hole, one side of which is connected to the coil of the stator, and the other side of which is inserted with the energizing pin.

In addition, the plurality of energizing pins may be radially arranged around a driving shaft provided in the power transmission mechanism.

In addition, the cover allows the end portion, which is disposed inside the housing of the energizing fin, to remain fixed between the stator and the partition.

According to another aspect of the present invention, there is provided a stator core comprising: a stator core; A coil wound on the stator core; A plurality of energizing pins electrically connected to the coils and disposed to extend along the longitudinal direction of the stator core; And fixing means for fixing the plurality of energizing pins so as to face one end of the stator core.

Here, the fixing means may include a fixing plate to which the plurality of energizing pins are fixed.

The fixing means may include a cover for fixing the fixing plate to one end of the stator core.

Further, the cover has a ring-shaped opening with a center, and the energizing pin can be arranged to face one side of the cover.

According to the aspects of the present invention having the above-described structure, the pressure of the refrigerant in the housing pushes the fixed plate toward the partition wall, whereby the leakage of the refrigerant between the energizing pin and the housing can be blocked, The sealing performance can be maintained satisfactorily.

In addition, since the through holes through which the energizing pins pass through the partition walls can be arranged at arbitrary positions, not only the deformation of the housing in the area between the through holes can be minimized, So that it is possible to further prevent deformation of the housing.

In addition, since the cover is fixed to the stator and the cover to which the fixing plate is inserted, it is possible to stably hold the energizing pin in the stator during the manufacturing process.

Further, by disposing the fixing means for fixing the fixing plate to the partition wall so as to be accessible from the inside of the housing, it is possible to more easily engage the fixing means and simplify the entire structure of the housing.

Further, it is possible to separately provide an energizing means for electrically connecting the coils provided in the stator and the energizing pins, thereby making it possible to stably and easily make an electrical connection therebetween.

1 is a sectional view showing an embodiment of an electric compressor according to the present invention.
2 is a perspective view illustrating the stator assembly of the embodiment shown in FIG.
Figure 3 is an exploded perspective view of the stator assembly shown in Figure 2;
4 is a perspective view showing an upper surface of the housing of the embodiment shown in FIG.
5 is a partially enlarged view showing a state of engagement between the fixed plate and the partition wall in the embodiment shown in FIG.
FIG. 6 is a perspective view showing a cover of the embodiment shown in FIG. 1. FIG.
7 is a partial enlarged view showing a state of engagement of the cover and the stator shown in Fig.
8 is a perspective view showing the energizing means in the embodiment shown in Fig.
Fig. 9 is a plan view showing a state in which the energizing means shown in Fig. 8 is mounted. Fig.
10 is a perspective view showing a modified example of the energizing means shown in Fig.
11 is a partial enlarged view showing an electrical connection state of the energizing means and the coil shown in Fig.
Fig. 12 is a plan view showing a state in which the energizing means shown in Fig. 11 is mounted. Fig.

Hereinafter, embodiments of the motor-driven compressor according to the present invention will be described in detail with reference to the accompanying drawings.

1, a first embodiment 100 of a motor-driven compressor according to the present invention is shown. The first embodiment 100 includes a main housing 110 for accommodating a compression mechanism and a motor housing 120 for accommodating a motor as a driving means. A control unit accommodating space 121 for accommodating a control unit (not shown) for controlling the power supplied to the motor is formed at the right end of the motor housing 120, The control cover 122 is fastened to the end of the motor housing 120. [

The main housing 110 houses a compression mechanism including a fixed scroll 130 and an orbiting scroll 132 therein. Since the fixed scroll and the orbiting scroll can adopt a conventionally known shape, a detailed description thereof will be omitted. It is needless to say that the compression mechanism portion is not necessarily illustrated, and that a mechanism portion having any structure and shape that can be driven by the motor can be used as the compression mechanism portion.

The orbiting scroll 132 is arranged to pivot relative to the fixed scroll 130 while being supported on the fixed frame 134. A rotary shaft 136 is rotatably installed on the fixed frame 134. [ The rotary shaft 136 is connected to the orbiting scroll 132 to eccentrically rotate the orbiting scroll.

A discharge port 112 is formed in the vicinity of the left end of the main housing 110. The discharge port 112 communicates with the discharge hole 130a formed in the fixed scroll 130 to discharge the compressed refrigerant And is discharged to the outside of the compressor. Here, the discharge port 112 is formed as a pipe extending vertically with reference to FIG. 1, and an oil reservoir 114 for collecting and temporarily storing the oil discharged together with the refrigerant is formed at a lower portion thereof. The oil reservoir 114 communicates with the low pressure space (suction space) of the internal space of the embodiment by the oil passage 116 to return the collected oil to the inside of the housing.

The motor housing 120 is formed separately from the main housing 110 and is integrally fastened by any means not shown. In some cases, the motor housing and the main housing are integrally formed.

Inside the motor housing 120, a stator 140 is fixed to the inner wall of the motor housing 120 by hot pressing. Of course, the stator can be fixed by any other method other than hot pressing. The stator 140 includes a core 142 in the form of a laminate of an electrical steel sheet having a thin thin plate shape and a coil 144 wound around the core 142. The coil 144 is formed such that both ends of the coil 144 protrude from the surface of the core 142, and the protruded portion may be referred to as a core end 144a.

A rotor 150 is disposed at the center of the stator 140. The outer circumferential surface of the rotor 150 is spaced apart from the inner circumferential surface of the stator 140 by a predetermined gap and the rotary shaft 136 is inserted and fixed at the center of the rotor 150. Accordingly, the rotor 150 and the rotation shaft 136 rotate integrally. The right end of the rotation shaft 136 is mounted to the boss 148 formed on the partition wall 146 of the motor housing 120 via a journal bearing 149. That is, a journal bearing 149 is positioned on the inner wall of the boss 148 and an end 136a of the rotation shaft 136 is inserted into the journal bearing 149, So as to be rotatably supported.

In the illustrated embodiment, the motor housed in the motor housing is in the form of a three-phase motor using a three-phase power source, whereby coils corresponding to the three phases are wound on the core, respectively. A control unit (not shown) for controlling the rotation of the rotor so as to have an intended rotation speed by applying a current to the coil is accommodated in the control space 121 of the motor housing 120. The control unit typically has a shape of a PCB substrate having an inverter circuit incorporated therein, and the inverter circuit of the PCB substrate must be electrically connected to the coil.

And an energizing pin 160 for this purpose is provided on the stator side. Specifically, three energizing fins 160 are provided so as to be connected to the three-phase coil, respectively, and each energizing pin must be electrically connected to the coil and the PCB substrate, respectively.

Since the partition wall 146 is formed so as to partition the motor housing space of the motor housing and the control housing space 121, the respective energizing pins 160 enter the control housing space from the motor housing space. A through hole 146a is formed in the partition wall 146 so as to allow the partition wall 146 to be opened. That is, since the energizing pin 160 is connected to the control unit through the partition wall in the radial direction of the stator 140, the inner diameter of the motor housing 120 is substantially equal to the outer diameter of the stator core 142 . This is different from the conventional motor housing in that it places the energizing pin on the radially outer side of the stator, thereby reducing the diameter of the motor housing.

A cover 170 is additionally disposed to cover the upper surface (the right end surface in reference to FIG. 1) of the coil end of the stator, and the coil 144 and the energizing pin 160 A stationary plate 190 to which the energizing pin 160 is fixed and a gasket 200 disposed between the stationary plate 190 and the partition 146 are disposed. Hereinafter, each component will be described in detail.

2 and 3, the fixing plate 190 has a substantially triangular shape. A first boss insertion hole 191 through which the boss 148 of the motor housing 120 passes is formed at a central portion thereof. . The first boss insertion hole 191 is formed to have a substantially circular shape corresponding to the shape of the boss 148. Three bolts 160 are disposed on the surface of the fixing plate 190 so as to be positioned at apexes of a substantially equilateral triangle and bolt insertion holes 192 and guide pin insertion holes 194 are formed.

The bolt insertion hole 192 is formed to have a substantially circular cross-section, and the guide pin insertion hole 194 is formed in the center of the fixing plate 190 in the assembling process of the electric compressor, So that the guide pin 196 can be inserted and fixed. Each of the energizing pins 160 includes a sealing part 197 inserted to penetrate the inside of the fixing plate and preventing the inserted energizing pin 160 from being detached. The sealing part 197 may be made of a flexible material such as silicone and the like when the fixing plate 190 is pressed against the partition wall 146 by the bolt. (See Fig. 1). Thus, the fixing plate and the energizing pin are prevented from coming into direct contact with each other, so that the fixing plate can be maintained in an insulated state with respect to the energizing pin. In some cases, the fixing plate may be formed of a synthetic resin material in order to improve the insulating property.

Meanwhile, the gasket 200 is positioned on the upper surface of the fixing plate 190 (refer to FIGS. 2 and 3). Specifically, the gasket 200 includes an energizing pin insertion hole 202 through which the energizing fin 160 passes, a bolt insertion hole 204 through which the bolt is inserted, and a guide through which the guide pin 196 is inserted and fixed. And a pin insertion hole 206 are respectively formed. In addition, a third boss insertion hole 208 for inserting the boss 148 is formed at the center of the gasket 200.

The bolt insertion hole 204 is arranged to be aligned with a bolt insertion hole 192 formed in the fixing plate 190 so that a bolt functioning as a fixing means can be fastened to the partition wall 146 of the housing. The guide pin insertion hole 206 is formed at a position corresponding to the guide pin inserted into the fixing plate, but the shape is formed to have a substantially triangular shape. The inner diameter of the bolt insertion hole is formed to be slightly larger than the outer diameter of the bolt to be inserted so that the bolt can be inserted freely. On the other hand, the guide pin insertion hole 206 is formed to be smaller than the guide pin, When the pin is inserted, the guide pin allows the gasket 200 to remain fixed with respect to the fixing plate 190.

Here, the three energizing pins 160 are arranged to have a substantially regular triangular shape as described above. That is, the three energizing pins 160 are disposed at equal distances of about 120 degrees on the circumference with respect to the center O of the rotor. The circle C formed by the three points on which the three energizing fins are disposed is smaller than the outer diameter of the stator core and is smaller than the inner diameter of the third boss insertion hole 208 formed in the gasket 200 Big.

Here, the ring-shaped area defined by the outer diameter of the stator core and the third boss insertion hole can be referred to as an available area. The available area is defined as a space in which the three energizing pins 160 can be disposed, and in the illustrated embodiment, the three energizing fins are uniformly arranged at intervals of 120 degrees within the available area as described above However, it should be understood that the present invention is not limited thereto, and may be disposed at any position among the usable regions.

For example, the three energizing pins may be disposed non-uniformly within the available area, or may be disposed offset to one of the available areas. In addition, the three energizing pins may be disposed at different distances from the center of the rotation axis.

In the above embodiment, three energizing pins are provided, but different numbers of energizing pins may be provided depending on the used AC power source. For example, if a five-phase power source is used, the interval between the energizing pins can be set to 360/5 = 72 degrees.

In this way, by arranging the plurality of energizing pins in the available area, it is possible to keep the shape of the motor housing circular. In the conventional case, the energizing pins are disposed on the side surface of the stator, and a separate space for accommodating the energizing pins needs to be formed in the motor housing. Thus, the shape of the motor housing becomes complicated. This makes it difficult to process the motor housing. However, in the above embodiment, the motor housing can be maintained in a circular shape, so that the manufacturing process of the motor housing can be simplified, and the volume occupied by the motor housing can be reduced do.

Referring to FIG. 4, a control housing space 121 formed at one side of the motor housing is shown. The control room accommodating space 121 is partitioned by a partition wall 146 into a motor accommodating space, and a partitioning hole 146a for inserting the energizing fin described above is formed in the partition wall. Although not shown, the control unit may include a PCB substrate on which an inverter circuit composed of elements such as a power semiconductor is implemented, and a terminal for electrically connecting to an energizing pin passing through the through hole is provided on the PCB substrate . The terminal has an arbitrary resilient means and can stably maintain the electrical connection with the protruded energizing pin.

Referring to Fig. 5, a form in which the cover and the fixing plate are fixed with respect to the partition is shown. The fixing plate 190 is inserted and fixed in a cover to be described later in a state where the energizing pin 160 is fixed. The cover is fixed to the stator core. The cover and the fixing plate are fixed to the partition wall 146 by the fixing bolts 210 described above. The fixing bolt 210 has a threaded portion 212 inserted and fixed to the partition 146 and a head 214 integrally formed with the threaded portion 212.

As shown, the head 214 is disposed inside the motor housing space of the motor housing. That is, the head 2140 is disposed so as to be accessible from the inner side of the motor housing. Therefore, in order to fasten the fixing bolt 210, a tool such as a driver is inserted into the inner space of the motor housing to be fastened . The fixing bolt 210 presses the fixing plate against the partition and presses the gasket between the partition and the fixing plate so that leakage through the passage hole 146a can be prevented .

Further, the position where the head of the fixing bolt is located is maintained at a higher pressure than the outside of the motor housing and the housing space of the motor housing, and the higher the pressure of the refrigerant used, the greater the pressure difference with the outside. As a result, the pressure in the motor housing acts on the fixed plate and the gasket, thereby further improving the leakage preventing performance.

The fixing plate 190 is inserted into and fixed to the cover 170. 6 and 7, the cover 170 is formed to have a circular shape having an inner diameter slightly smaller than the core of the stator, and is fixed above the bobbin 147 installed at one end of the stator core . Specifically, the bobbin 147 has a space between the outer wall and the inner wall, into which the coil end 144a is inserted, and has a recess 147a in the inner wall. A plurality of recesses 147a are formed along the inner surface of the inner wall of the bobbin 147 and hooks 171 are formed on the bottom surface of the cover 170 to be inserted and fixed in the recess 147a .

The hook portion 171 extends along the longitudinal direction of the rotation shaft 136, and a wedge-shaped hook 172 is formed at an end thereof. The hook 172 is elastically inserted into the recess 147a so that the cover 170 can be held in a fixed state with respect to the stator during assembly.

On the upper surface of the cover 170, a plurality of spaces are defined. A second boss insertion hole 173 into which the boss 148 is inserted is formed in a circular shape and three conductive pin support portions 174 are formed around the second boss insertion hole 173 . The conductive pin support portion 174 is recessed to have a substantially circular cross-section, and one end of the conductive pin is received and fixed in the conductive pin support portion 174.

A guide pin support portion 175 and a bolt insertion hole 176 are disposed between the three conductive pin support portions 174, respectively. The guide pin supporter 175 is formed to be concave to have a circular cross-section similar to the energizing pin supporter although it is different in size. The above-described guide pin is inserted into and supported by the inside of the guide pin supporter 175. The bolt fastening hole 176 is formed to be larger than the head 214 of the fixing bolt so that the fastening bolt can be completely passed therethrough. As a result, as shown in FIG. 5, the fixing bolt is arranged so as not to be in contact with the cover in the engaged state, and presses the fixing plate rather than the cover.

A terminal inserting portion 177 is formed radially outward of each of the energizing pin supporting portions 174. The terminal insertion portion 177 is defined by a partition wall 178 formed on the surface of the cover 170. The terminal inserting portion 177 has such a shape that the outer shape of the terminal can be received so that a terminal to be described later can be inserted. Specifically, the terminal inserting portion 177 is disposed at a predetermined angle along the outer peripheral portion of the cover to have a substantially circular arc shape, and is connected to the energizing pin supporting portion 174 at a substantially central portion thereof.

A coil fixing groove 178a is formed in a portion of the partition wall 178 that defines the terminal insertion portion 177 and corresponds to both ends of the terminal insertion portion 177. The coil fixing groove 178a is formed such that a coil drawn to the upper side of the cover can be inserted and fixed through the coil lead-out hole 179 disposed between the respective terminal insertion portions 177. [ Therefore, one coil fixing groove is formed at each end of one terminal inserting portion 177, and one end of the coil corresponding to an arbitrary phase and the other coil adjacent to the other phase One end is inserted each.

A plurality of protrusions 170a are radially formed on the outer circumferential surface of the cover 170. The protrusions 170a are in contact with the upper surface of the bobbin 147, As shown in FIG.

Referring to Figure 8, the terminal 180 is shown. The terminal 180 includes a bus bar 184 extending in a substantially circular arc shape and a conductive pin press-in portion 182 protruding inward from a central portion of the bus bar 184. The energizing pin press-in portion 182 is formed with a sleeve 182a for pressing and fixing the energizing pin 160 therein. The inner diameter of the sleeve 182a is smaller than the outer diameter of the energizing pin 160 so that the energizing pin is not easily detached once it is inserted. The bus bar 184 has a thin plate shape. In FIG. 8, both ends of the straight line are formed so as to be bent in an inclined manner.

At both ends of the bus bar 184, caulking portions 186 having a substantially U shape are formed. The caulking portion 186 is a portion to be electrically connected to the end portion of the coil. The caulking portion 186 deforms the caulking portion by using a separate tool or the like while the end portion of the coil is held in the caulking portion, To be maintained. The terminal may be formed of a conductive metal thin plate such as aluminum or copper, so that the caulking portion can be easily deformed.

FIG. 9 is a plan view showing a state in which the terminal 180 is disposed. In the case of a three-phase motor, one terminal, that is, three terminals, is required for each phase. As shown in the figure, one end of the coil corresponding to the U phase may be connected to one end of the terminal located at the lower left of FIG. 9, and one end of the coil of the W phase may be connected to the other end of the terminal. Likewise, in the case of the terminal located at the lower right, it can be connected to the V phase and the U phase coil, respectively. The three terminals are arranged on one circumference and arranged so as not to overlap each other in the radial direction. Also, the end of the bus bar is spaced apart from the bus bar of another neighboring terminal. However, it is to be understood that the connection method is illustrative and may be connected in other forms according to the winding method of the coil.

As shown, since the terminals are located in the upper right room of the ends of the respective coils, the distance between the coil ends and the caulking portions of the terminals can be minimized. As a result, the length of the outgoing line of the coil can be reduced, so that the arrangement of components inside the motor housing can be simplified and the durability can be improved.

Meanwhile, in the state where the end portions of the coils are connected to the two caulking portions provided in the terminal, the terminal inserting portion 177 is filled with an insulating material such as silicone. The insulating material thus charged not only electrically insulates the terminal and the coil from the outside but also prevents the end of the metal and the end of the coil from contacting with the refrigerant, thereby preventing the corrosion of the terminal and the coil.

Now, the operation of the above embodiment will be described. However, in the following description, the compression mechanism and the motor may adopt any existing ones, and a description thereof will be omitted.

First, the assembling method of the above embodiment will be described. The main housing may be assembled according to a conventional method. In the case of the motor housing, a plurality of electrical steel sheets are stacked to form a stator core. Then, the bobbin is mounted on both ends of the stator core, and then the three-phase coil is wound.

Then, the cover 170 is mounted on the bobbin. Concretely, the cover 170 is fixed to the upper side of the bobbin by engaging the hook portion 172 of the cover 170 with the concave portion 147a formed inside the bobbin as described above. Then, both ends of the coil are pulled out to the upper side of the cover through the coil drawing-out hole 179 of the cover 170, and then caulked at both ends of the terminal.

When the connection between the terminal and the coil is completed, the terminal is inserted into the terminal inserting portion 177 and filled with silicon to complete the insulation and fixing between the terminal and the coil.

Thereafter, a plurality of energizing pins are press-fitted into the energizing pin support portions 174 of the terminal, and the guide pins 196 are inserted and fixed in the guide pin supporter 175 in a similar manner. Then, the fixing plate 190 is disposed to penetrate the conductive pin and the guide pin, and then the sealing portion 197 is formed in the gap between the conductive pin and the fixing plate 180. Further, when the gasket 200 is inserted to be fixed by the guide pin, the assembling of the stator assembly is completed.

In this state, the stator assembly is fixed to the inside of the motor housing by the hot press method in a state where the energizing pins are fixed to the stator assembly. When the hot stamping of the stator assembly is completed, the fixing plate 190 is fixed to the partition wall 146 using the fixing bolts. Here, since the fixing plate 190 is not completely fixed to the cover 170, the fixing plate may be spaced apart from the cover by a predetermined distance as the fixing bolts are tightened. Accordingly, even after the stator assembly is fixed to the inside of the motor housing by the hot pressing method, it is possible to perform the fastening operation on the partition of the stationary plate without displacing the position of the hot-pressed stator.

When the fastening operation of the fixing plate is completed, the three energizing pins are fixed to protrude into the control room accommodating space. Here, the control unit including the above-described PCB substrate is embedded in the control unit accommodating space, and then the control unit cover 122 is fastened to the motor housing.

Thereafter, the rotor is mounted inside the stator core. At this time, one end of the rotating shaft fixed to the rotor is supported by the boss 148. Here, the boss 148 is inserted into the second boss insertion hole 173 of the cover 170 described above. Similarly, the boss 148 protrudes toward the rotation axis through the center of the fixing plate 190 and the gasket.

Therefore, the length of the rotation shaft 136 can be reduced compared with the case where the boss 148 is positioned on the right side (reference in FIG. 1) of the fixing plate 190. Also, the length of the rotation axis of the motor housing along the axial direction can be smaller than that of the case where the boss 148 is positioned on the right side (reference to FIG. 1) of the fixed plate 190. 1, the rotary shaft is supported by a slide bearing on the inner side of the boss 148.

Specifically, as shown in FIG. 1 (a), the boss portion 148 is disposed to pass through the inside of the first to third boss insertion holes. If the boss portion is located on the right side (reference to FIG. 1) of the gasket 200, the end portion of the rotation shaft 136 must be inserted into the boss portion through the first to third boss insertion holes, The length of the rotation shaft can not be avoided.

When the length of the rotary shaft is increased in this way, the centering operation of the rotor with respect to the housing becomes difficult, and the rigidity against deformation becomes weak.

However, in the above-described embodiment, since the bosses are inserted into the housing through the first to third boss insertion holes, the length of the rotation shaft can be reduced accordingly. In addition, by inserting the boss portion in the first to third boss insertion holes, the fixing plate, the cover, and the gasket are additionally supported, thereby enhancing the structural stability and minimizing the positional deviation thereof during the assembling process.

Meanwhile, the inner space of the motor housing functions as a low-pressure space in which the suction refrigerant temporarily stays before entering the compression chamber defined by the fixed scroll and the orbiting scroll. However, the meaning of the low-pressure space means that the refrigerant pressure in the low-pressure space is relatively low as compared with the refrigerant after completion of compression, and the refrigerant pressure in the low-pressure space may be higher than the atmospheric pressure. In particular, the refrigerant used in the supercritical cycle, such as CO ₂ , is maintained at a much higher level than the atmospheric pressure in the low pressure space.

On the other hand, the control room accommodating space has a pressure similar to atmospheric pressure. Therefore, in a normal situation, refrigerant and oil staying in the motor housing tend to leak toward the control room accommodation space. However, in the above-described embodiment, the fixing plate 190 covers the vent hole 146a serving as the passage of the leakage. In particular, since the fixing plate 190 is located in the low-pressure space, the pressure applied by the refrigerant is applied, and the direction in which the pressure is applied is from left to right with reference to FIG.

As a result, the fixing plate is strongly pressed toward the partition wall, which causes a phenomenon of sealing the passage hole. In addition, since the fixing bolt also presses the fixing plate toward the partition wall, the sealing performance is doubled.

In addition, since the three energizing pins are uniformly arranged along the circumference, a sufficient distance can be secured between the through holes. As a result, the possibility of deformation due to pressure can be minimized as compared with the case where three tube holes are conventionally located.

Further, since all of the three energizing pins are located in a region smaller than the outer diameter of the stator, it is possible to minimize changes in the size and shape of the motor housing due to the energizing pins.

It is to be understood that the present invention is not limited to the embodiment described above, but may be modified in various ways. For example, the terminal is not necessarily limited to the illustrated form, but may be modified in various forms.

10 shows a modified example of the terminal. The modified example 280 includes the energizing pin press-in portion 282 for inserting the energizing pin 160 and the sleeve extending downward from the energizing pin press- (284). The first to third bus bars 285, 286 and 287 are disposed on both sides of the energizing pin press-in portion 282, respectively. Here, the first bus bar 285 is located at one side (clockwise direction in FIG. 10) of the energizing pin press-in portion 282, and the second and third bus bars 286 and 287 are located at the other side, A first stage jaw 288 is positioned between the first and second bus bars 285 and 286 and a second stage jaw 289 is positioned between the second and third bus bars 285 and 286 Thus, the first bus bar is positioned at the innermost position in the radial direction, and the second and third bus bars are sequentially located radially outward.

In addition, each bus bar has a shape that is similar to the shape of the stator, i.e., has an arc shape along the periphery of the stator.

In this modified example, three terminals are arranged in total as in the previous embodiment, and are disposed so as to overlap each other in the radial direction as shown in the respective terminals. That is, a bus portion of another terminal is disposed in a space formed by the first step 288 and the second step 289. In this section, two bus bars included in different terminals are arranged to overlap each other in a radial direction do.

A total of four coil fixing portions 290 are formed on the first to third bus bars. The coil fixing portion 290 is formed to have a plurality of teeth portions so that two coils can be fitted and fixed.

11, the coil fixing portion 290 serves to fix both end portions of the coil 144 between the teeth portions, and is similar to the caulking portion in the example shown in FIG. 8 . Further, a coil guide portion 278 is formed on a part of the cover 270 contacting with the coil so that the coil is positioned at the correct position.

12, the cover 270 has a shape similar to that of the cover shown in FIG. 6 as a whole, but a bus bar accommodating portion 272 for accommodating the first to third bus bars is formed by a partition wall And is arranged adjacent to the outer peripheral portion of the cover 270. [ That is, the bus bar receiving portion 272 is formed to have a narrow groove shape disposed adjacent to the outer peripheral side of the cover, and the peripheral portion of the partition and the cover are formed to define the groove. Here, the groove is formed to have a substantially arcuate shape corresponding to the shape of the bus bar.

A stopper 273 is formed in the bus bar accommodating portion 272 at a predetermined interval. Specifically, the stopper 273 is formed to have a circular arcuate shape, and has two side ends along the circumferential direction, Are arranged to contact or oppose the bus bars. Accordingly, the stopper 273 is in contact with any one of the first or second step portions 288 and 289 so that the terminal is placed in a proper position, and also the neighboring bus bars are separated from each other .

Three energizing pin supporting portions 274 are disposed radially inward of the bus bar receiving portion, and the energizing pin pressing portion 282 of the terminal is located inside the energizing pin supporting portion 274. 8, a guide pin support portion 275 and a bolt insertion hole 276 are disposed between the respective conductive pin support portions 274, respectively. In addition, the coil guide portion 278 is radially disposed on the outer periphery of the cover 270.

In the above-described terminal, since the coils are connected to the bus bars dispersed to the left and right at a plurality of places, the length of the lead wire from the coil end can be shortened further, and the contact between the housing and the coil can be prevented. In addition, the bus bars are divided in both directions around the energizing pin press-in portions, and currents are dispersed to reduce the area of the bus bars.

Claims (17)

A compression mechanism for compressing the working fluid;
A transmission mechanism for driving the compression mechanism;
A housing having a partition for partitioning a space in which the transmission mechanism is housed;
A plurality of energizing pins electrically connected to the power transmission mechanism and disposed through the partition walls;
A fixing plate having the plurality of energizing pins fixed thereto and having opposed faces opposing the housing; And
And a control unit disposed on a back surface of the partition. The method according to claim 1,
The motor-
A stator fixed to the inner wall of the housing, and a rotor rotatably disposed inside the stator,
And the fixed plate is fixed to the stator. 3. The method of claim 2,
Further comprising a cover having one side fixed to the stator and the other fixed to the other side of the cover. The method according to claim 1,
Further comprising fixing means for fixing the fixing plate to the partition, and the fixing means is disposed so as to be accessible from the inside of the housing. 5. The method of claim 4,
Wherein the fixing means includes a plurality of bolts, and the head of the bolt is located inside the housing. The method according to claim 1,
And a gasket is provided between the fixed plate and the partition wall. The method according to claim 6,
Wherein the gasket is provided with a plurality of openings into which the plurality of energizing fins are inserted so as to pass therethrough. The method according to claim 1,
Wherein one end of the plurality of energizing fins is fixed to the fixed plate and the other end of the energizing pin is protruded to the control unit side through the partition wall. The method according to claim 1,
And an energizing means for electrically connecting the energizing pin to a coil provided in the stator. 10. The method of claim 9,
And the energizing means is fixed to the cover. 10. The method of claim 9,
Wherein the energizing means has one side connected to a coil provided in the stator and another side formed with an insertion hole into which the energizing pin is inserted. The method according to claim 1,
Wherein the plurality of energizing pins are radially disposed around a drive shaft provided in the power transmission mechanism portion. The method of claim 3,
And an end portion disposed inside the housing of the energizing pin is fixed by the cover between the stator and the partition. Stator core;
A coil wound on the stator core;
A plurality of energizing pins electrically connected to the coils and disposed to extend along the longitudinal direction of the stator core;
And fixing means for fixing the plurality of energizing pins so as to face one end of the stator core. 15. The method of claim 14,
Wherein the fastening means comprises a fastening plate to which the plurality of energizing fins are secured. 16. The method of claim 15,
Wherein the fastening means comprises a cover for fastening the fastening plate to one end of the stator core. 17. The method of claim 16,
Wherein the cover has a ring-shaped opening with a center, and the energizing pin is arranged to face one side of the cover.

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