JP2007162661A - Electric compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric compressor in which the cooling performance of a drive circuit part 5 is improved in its restricted space in the electric compressor formed by integrating a motor, a compressor, and the drive circuit part 5 supplying electric power to the motor with one another. <P>SOLUTION: A projecting portion 15 having a projecting shape projecting to the radial outer side is formed on a motor housing 4 on the side where the drive circuit part 5 is installed. A refrigerant passage 13 is so formed that the inner shape of the projecting portion 15 is symmetrical to its outer surface shape. The shape of the envelope 8 of the drive circuit part on the side mounted on the motor housing 4 has a recessed portion 16 corresponding to the outer shape of the projecting portion 15. The drive circuit part 5 is installed on the motor housing 4 so as to cover the projecting portion 15 so that the heat generated in the drive circuit part 5 is transmitted into the refrigerant passage 13 through the outer surface of the projecting portion 15. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric compressor in which a motor unit, a drive circuit unit for supplying power to the motor unit, and a compressor unit are integrated, and in particular, the drive circuit unit is integrated with the motor unit. The present invention relates to an electric compressor.

  For example, a drive circuit unit including an inverter that integrates a refrigerant compressor for an air conditioner mounted on a vehicle such as an automobile and a motor that rotationally drives the same on a common shaft, and further supplies power to the motor Attempts have also been made to make it easy to mount the motor on a vehicle that has no space and is integrated with the motor.

  Both the motor and the drive circuit section need to be cooled, but when the refrigerant compressor and the motor are integrated and the drive circuit is integrated with the motor in this way, they must be arranged at a high density. Therefore, it is important to properly cool the motor and the drive circuit. As a means for cooling the motor, a low-temperature suction refrigerant consisting of almost gas on the way from the evaporator of the refrigeration cycle to the refrigerant compressor is passed through a refrigerant passage formed so as to cover a part of the outer periphery of the stator of the motor. The method of cooling the motor can be taken. Next, as a means for cooling the drive circuit unit, the drive circuit unit is attached to a part of the outer surface of the motor housing and cooled by the same refrigerant flowing in the same refrigerant passage passing through the inner surface of the motor housing. Can be taken.

  An electric compressor employing such a cooling method is described in Patent Document 1 and Patent Document 2. The outer shape of the envelope of the drive circuit unit of the electric compressor of Patent Document 1 is a flat surface. The state of arrangement of various electric circuit elements arranged inside the drive circuit unit is not described and details are unknown, but it can be assumed that the electric circuit elements have various sizes. Therefore, a lot of space remains between the small electric circuit element and the inner wall of the envelope. Further, the motor housing side to which the drive circuit unit is attached is also a flat surface, and heat transfer is performed between the drive circuit unit and the motor housing through the flat surface. Because it is far from the passage, it hardly contributes as a heat transfer surface. For this reason, it can be said that the cooling structure of Patent Document 1 cannot be employed under conditions where the thermal load of the drive circuit unit is high.

  The electric compressor shown in FIG. 3 of Patent Document 2 is provided with a large number of radiating fins in the refrigerant passage inside the motor unit housing in order to cool the drive circuit unit. Although this structure can improve the cooling performance of the drive circuit unit as compared with the case of a simple flat surface, a lot of unused space remains in the drive circuit unit.

Japanese Patent Laid-Open No. 2003-324900 JP 2002-174178 A

  In view of the above-described problems in the prior art, the present invention provides an electric compressor in which a motor, a compressor driven to rotate by the motor, and a drive circuit unit that supplies electric power to the motor are integrated. An object is to improve the cooling performance of the drive circuit section in a limited space.

  As described above, usually, a lot of unused space remains between the small components in the electric circuit elements constituting the inverter of the drive circuit unit and the drive circuit unit envelope. The present invention provides a drive circuit in the limited space described above by projecting the refrigerant passage portion of the motor unit housing to the drive circuit unit side so as to fill the space not effectively used in the drive circuit unit. The purpose of improving the cooling performance of the part is achieved.

  To achieve this object, an electric compressor according to claim 1 of the present invention is a motor comprising a rotor (11) having a rotating shaft (10), a stator (9), and a wall surrounding the stator (9). A motor part (3) having at least a part housing (4), and a drive circuit part (5) having an envelope (8) and including an inverter for operating the motor part (3) therein An electric compressor integrated with a compression unit (2) that is rotationally driven by the motor unit (3) and compresses a fluid, wherein the drive circuit unit (5) is located radially outside the rotor (11). As a cooling medium for the drive circuit portion (5) and the motor portion (3), the fluid that is attached to the outer surface of the motor portion housing (4) and is sucked into the compression portion (2) and compressed before being compressed. Refrigerant flow for flowing through the motor part (3). (13) is an electric motor formed by at least a part of the inner surface of the wall of the motor unit housing (4) on the side to which the drive circuit unit (5) is attached and the outer peripheral surface of the stator (9) facing the inner surface. In the compressor, the motor part housing (4) on the side to which the drive circuit part (5) is attached is formed with a protruding part (15) having a protruding shape protruding outward in the radial direction of the rotor. The refrigerant passage (13) is formed so that the internal shape of (15) is substantially similar to the protruding shape, and the side of the envelope (8) of the drive circuit portion attached to the motor housing (4) is The motor part housing (4) has a recessed part (16) corresponding to the protruding part (15) of the motor part housing (4), and the drive circuit part (5) covers the protruding part (15). Mounting As a result, heat generated in the drive circuit section (5) is transmitted to the cooling medium in the refrigerant passage (13) through the outer surface of the projecting portion (15) of the motor section housing (4). There is.

  According to the first aspect of the present invention, the housing protruding portion (15) having the refrigerant passage (13) therein has a large area as compared with the case where the outside of the refrigerant passage (13) is a flat surface. As a result, the amount of heat transfer increases. Further, if a small electric circuit element of the drive circuit unit is arranged above the projecting portion (15), the cooling performance can be improved without increasing the height dimension of the drive circuit unit.

  In the electric compressor according to claim 2, the side of the drive circuit portion (5) of the electric compressor according to claim 1 facing the motor portion housing (4) is not covered by the envelope (8). It is characterized by comprising a non-covered surface. According to this structure, since the air in the envelope directly touches the protruding portion of the housing, the cooling performance is further improved.

  The electric compressor according to any one of claims 3 to 6 is characterized in that the protruding shapes of the housing protruding portion of the electric compressor according to claim 1 or 2 are a rectangle, a trapezoid, a triangle, and a semicircle, respectively. .

  In the electric compressor according to claim 7, the protruding shape of the housing protruding portion of the electric compressor according to claim 2 is convex, that is, the first horizontal side at the uppermost end of the center portion and the first horizontal side. Two first vertical sides extending substantially vertically downward from both ends of the first vertical sides, two second horizontal sides extending substantially horizontally outward from the respective lower ends of the first vertical sides, and outer sides of the second horizontal sides. And two second vertical sides extending substantially vertically downward from the ends of the two.

  In the electric compressor according to claim 8, the protruding shape of the housing protruding portion of the electric compressor according to claim 2 is a semi-convex shape having two shoulder portions on one side, that is, the first horizontal side at the uppermost end. A first vertical side extending substantially vertically downward from one end of the side, a second horizontal side extending substantially horizontally outward from a lower end of the first vertical side, and substantially vertical from an outer end of the second horizontal side A length obtained by adding the length of the first vertical side and the second vertical side to the second vertical side extending downward and the third vertical side extending substantially vertically downward from the other end of the first horizontal side And a third vertical side having a length substantially equal to.

  The electric compressor according to claim 9, wherein the inverter of the drive circuit unit (105) has a plurality of types of electric circuit elements having different sizes, and the plurality of types of electric circuit elements are mounted on the circuit board (109) as components. At least one circuit board (109) mounted on the surface side, and when the drive circuit section (105) is attached to the motor section housing (104), the component mounting surface of the circuit board (109) is 8. The electric compressor according to claim 7, wherein the electric circuit element is arranged so as to face the motor unit housing (104), wherein the plurality of types of electric circuit elements are the first of the housing protruding portions represented by the first horizontal side. The first vertical surface (115b) and the second horizontal surface (115a) of the housing projecting part represented by the first vertical side and the second horizontal side, respectively, which are in contact with the horizontal surface (115a) (110) ) To those contact (111), and is characterized in that it comprises second second vertical surface of the housing projecting portion represented by vertical side (the one that contacts the 115b ') (112).

  According to the electric compressor of claim 9, since it becomes possible to arrange the electric circuit element without leaving a space between the top surface of the electric circuit element and the protruding portion of the housing, the space utilization efficiency in the drive circuit unit In addition, since the top surface and the side surface of the electric circuit element are in direct contact with the housing, the cooling performance is further improved, and an element having a low heat resistance can be used.

  The electric compressor according to claim 10, wherein the protruding shape has a semi-convex shape having two shoulder portions on one side, and the inverters of the drive circuit portion (205) have different sizes from each other. A circuit element and at least one circuit board (209) for mounting the plurality of types of electric circuit elements on the component mounting surface side of the circuit board (209). 204. The electric compressor according to claim 8, wherein the component mounting surface of the circuit board (209) is disposed so as to face the motor unit housing (204) when attached to the motor board (204). The electric circuit element is in contact with the first horizontal surface (215a) of the housing protruding portion represented by the first horizontal side (210), and the housing is represented by the first vertical side and the second horizontal side, respectively. The first vertical surface (215b) and the second horizontal surface (215a ') of the protruding portion of the tongue, and the second vertical surface (215b') of the housing protruding portion represented by the second vertical side It is characterized by including what is contact | abutted to (212).

  According to the electric compressor of the tenth aspect, in addition to the effect obtained in the ninth aspect, it is possible to increase the width of the first and second horizontal planes and use an electric circuit element having a larger width. It becomes possible to do.

  In the electric compressor according to claim 11, the refrigerant passage includes a first refrigerant passage (213 a) directly below the first horizontal surface (215 a) of the protruding portion of the motor unit housing according to claim 10, and a second vertical surface. The second refrigerant passage (213b) provided directly below the base surface (204a) of the motor unit housing extending from the lower end of (215b) almost horizontally outside to the end of the motor unit housing (204). Abutting on the first horizontal plane (215a) (210), abutting on the first vertical plane (215b) and the second horizontal plane (215a ′) (211), and a second vertical plane (215b ′) ) And a member (212) abutted against the base surface (204a).

  According to the electric compressor of the eleventh aspect, since the refrigerant passages can be centrally arranged in the portion that needs to be cooled, an element having a low heat resistance can be used.

  In addition, the code | symbol in the parenthesis attached | subjected to each said means is an example which shows a corresponding relationship with the specific means as described in the Example mentioned later.

  Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In FIG. 1, an electric compressor 1 according to an embodiment includes, for example, a compression unit including a compressor such as a scroll compressor or a swash plate compressor used as a refrigerant compressor in an air conditioner mounted on a vehicle. 2, the motor unit 3 that is integrated on the axis of the rotation axis common to the compression unit 2, and rotationally drives the compression unit 2, and is integrally attached to a part of the outer peripheral surface of the housing 4 of the motor unit 3. The drive circuit unit 5 accommodates an inverter for supplying electric power to the motor unit 3.

  In order to cool the motor unit 3 from the inside and to cool the drive circuit unit 5 via the housing 4, a fluid to be compressed in the compression unit 2 at the end of the motor unit 3 opposite to the compression unit 2. A suction port 6 is provided for receiving (in this case, the vaporized refrigerant). On the other hand, a discharge port 7 for discharging the fluid compressed in the compression unit 2 is provided in the compression unit 2. Accordingly, the refrigerant (intake refrigerant) to be compressed in the compression unit 2 is sucked from the suction port 6 as shown by the arrow, flows into the housing 4 of the motor unit 3, and is compressed after the motor unit 3 and the drive circuit unit 5 are cooled. The refrigerant is compressed in the portion 2 and becomes a refrigerant having pressure (discharge refrigerant) and is discharged from the discharge port 7 to the outside of the electric compressor 1. The housing 4 of the motor unit 3 and the envelope 8 of the drive circuit unit 5 are both made of an aluminum alloy having good thermal conductivity.

  FIG. 2 shows a cross-sectional view of the motor unit and the drive circuit unit of the first embodiment of the present invention. The first embodiment is not characterized by the detailed structure inside the compression unit 2, the motor unit 3, and the drive circuit unit 5, and therefore, the internal structure is not shown in FIG. .

  The motor unit 3 includes an annular stator 9 supported by a substantially cylindrical inner surface of a wall of the housing 4 and a columnar rotor (armature) 11 rotatably supported by a central rotating shaft 10. Have. Although not shown, the inner peripheral slot of the stator 9 has windings, and for example, three-phase AC power is supplied to each part of the windings from an inverter housed in the drive circuit unit 5. As a result, a rotating magnetic field that moves and rotates in a predetermined direction on the fixed stator 9 is formed, and the rotor 11 rotates accordingly.

  The drive circuit unit 5 includes an electric circuit element such as a switching element, a coil, and a capacitor for constituting an inverter, a printed circuit board, an electric cable connected from the outside, and the like. Since 1 does not have a feature in its internal structure as described above, in FIG. 2, they are not drawn, and only the envelope 8 is drawn. The envelope 8 physically protects internal components to provide electromagnetic shielding, and ambient high-temperature air flows into the drive circuit unit 5 when placed in a high-temperature atmosphere such as an engine room of an automobile. Also prevent.

  The drive circuit unit 5 is attached to a base surface 4 a that is an outer surface above the motor unit housing 4. For installation, four bolts (not shown) arranged at the four corners of the envelope 8 are inserted through the envelope 8 from the outside and screwed into screw holes (not shown) provided on the housing 4 side. Is done.

  Since the motor unit 3 generates heat from the windings and the iron cores of the stator 9 and the rotor 11, it is necessary to cool the motor unit 3 in order to remove the heat. Furthermore, since the inverter of the drive circuit unit 5 also generates a large amount of heat, it is necessary to remove the heat. Accordingly, the refrigerant is in contact with the outer peripheral surface of the stator 9 and the refrigerant passage 13 extends in the axial direction of the rotor rotation shaft 10 in the motor unit housing 4 so that the refrigerant flows inside the motor unit housing 4 in contact with the drive circuit unit 5. Is formed in the shape of a groove, and one end side of the refrigerant passage communicates with the aforementioned suction port 6 and the other end side communicates with the compression portion 2.

  Next, with reference to FIG. 2, the side of the housing 4 to which the drive circuit unit 5 is attached will be described. The center surface of the base surface 4a of the housing protrudes in a rectangular shape to form a housing protruding portion 15. The housing protruding portion 15 includes a central horizontal surface 15a and two vertical surfaces 15b extending vertically downward from both ends of the horizontal surface 15a. A refrigerant passage 13 having a shape substantially similar to the rectangular shape of the protruding portion 15 is formed inside the housing protruding portion 15. The refrigerant passage 13 occupies as large a passage cross-sectional area as possible in the projecting portion 15 in order to enhance heat transfer, while satisfying the requirement that the wall of the projecting portion have a thickness capable of maintaining the necessary rigidity and strength. It is formed as follows.

On the other hand, the envelope 8 of the driving circuit unit 5 has a lower base surface 8a, an upper surface 8b, and two side surfaces 8c when viewed in FIG. An envelope recess 16 that can be fitted into the housing. Accordingly, the cross-sectional shape of the envelope 8 has a relatively low height h ₁ at the center and a relatively high height h ₂ at both ends, and the envelope recess 16 has a central horizontal surface 16a. , And two vertical surfaces 16b extending vertically downward from both ends of the horizontal surface 16a.

The inverter included in the drive circuit unit 5 is composed of various electric circuit elements such as a switching element, a coil, and a capacitor, and the heights of these components are also various. Although not shown in FIG. 2, in this embodiment, a high-height electric circuit element is disposed and accommodated in a portion having a high height h ₂ , and a relatively low electric circuit element has a low height h _1. Is housed in a house.

  As described above, the motor portion housing 4 and the drive circuit portion envelope 8 are provided with the protruding portion 15 and the recessed portion 16, respectively, and the refrigerant passage 13 is provided immediately inside the protruding portion so that the refrigerant flows. When the circuit unit 5 is fixed to the motor unit 3, the horizontal surface 15a of the motor unit housing 4 and the horizontal surface 16a of the envelope 8 are in contact with each other, and the vertical surfaces 15b and 16b on both sides are also in contact with almost no gap. The heat generated in the drive circuit unit 5 through these surfaces flows from the drive circuit unit 5 side into the refrigerant passage 13 to cool the drive circuit unit 5.

  Next, a second embodiment will be described with reference to FIG. In this embodiment, the air in the drive circuit unit envelope 8 is brought into direct contact with the protruding portion 15 of the housing 4 to reduce the heat resistance of heat transfer between the drive circuit unit 5 and the refrigerant passage 13. The side facing the motor housing 4 of the envelope 8 is an open surface with no lid. Therefore, the envelope 8 of the second embodiment has an upper surface 8b and two side surfaces 8c when viewed in FIG.

  Furthermore, in the two embodiments, the protruding shape of the protruding portion 15 is rectangular when viewed in the direction of FIG. 2 or 3, but the protruding shape is trapezoidal, triangular, semicircular, convex, and semicircular. Convex-shaped embodiments are also possible.

  Next, a third embodiment will be described with reference to FIG. A base surface 104a to which the drive unit 105 is attached is provided on the upper side of the electric unit housing 104 of the third embodiment shown in FIG. As in the first embodiment, a housing protruding portion 115 is formed from the base surface 104a. The protruding shape is a convex shape. That is, the housing protruding portion 115 includes a first horizontal surface 115a at the center tip, two first vertical surfaces 115b extending vertically downward from both ends of the first horizontal surface 115a, and horizontal ends from the ends of the first vertical surfaces 115b. Two second horizontal planes 115a ′ extending outward and two second vertical planes 115b ′ extending vertically downward from the end of each second horizontal plane 115a ′.

  A refrigerant passage 113 having a shape substantially similar to the protruding shape of the protruding portion 115 is formed inside the housing protruding portion 115. The refrigerant passage 13 occupies as large a passage cross-sectional area as possible in the protruding portion 115 in order to enhance heat transfer, while satisfying the requirement that the wall of the protruding portion have a thickness that can maintain the necessary rigidity and strength. It is formed as follows.

  On the other hand, the structure of the drive circuit unit 105 is not open and alone without any wall on the side facing the housing 104 of the envelope 108. In the envelope 108, a circuit board circuit board 109 constituting an inverter and a switching element (IGBT) 110, a coil 111, a capacitor 112, and the like mounted on the circuit board 109 are accommodated. As for the height of the electric circuit element, the capacitor 112 is the highest, the coil 111 is the next highest, and the switching element 110 is the lowest. The circuit board 109 is fixed to the envelope 108 so that the component mounting surface on which the electric circuit element is mounted faces the housing protruding portion 115.

  Depending on the size of the space formed between the circuit board 109 and the protruding portion 115, the component on the circuit board 109 of the drive circuit unit 105 has the highest capacitor 112 on the outermost side of the circuit board. When the switching element 110 having the lowest height is disposed in the center portion and the coil 111 having an intermediate height is disposed in the middle portion, and the envelope 108 of the driving circuit portion is attached to the housing 104, the switching element 110 is The top surface is in contact with the first horizontal surface 115a of the protruding portion 115, the coil 111 is in contact with the second horizontal surface 115a ′ and the side surface is in contact with the first vertical surface 115b, and the capacitor 112 is on the side surface. It abuts on the second vertical surface 115b ′.

  The drive circuit unit 105 is fixed to the housing 104 using bolts (not shown) as in the first embodiment. At that time, as described above, since the electric circuit elements inside thereof abut on the respective surfaces constituting the outer surface of the protruding portion 115, a part of the heat generated by the electric circuit elements having these abutting portions is mediated by air. Heat is transferred to the protruding portion 115 side. Similarly, the heat released into the air inside the envelope 108 flows into the refrigerant passage 113 through each surface constituting the outer surface of the protruding portion.

  In the third embodiment, the circuit board 109 is one, but it may be divided into a plurality of sheets, and some electric circuit elements are not mounted on the circuit board, for example, fixed to the envelope side. Sometimes it is done.

  Next, a fourth embodiment will be described below with reference to FIG. This embodiment is the same as the third embodiment except that the protruding shape of the protruding portion of the housing is a semi-convex shape having a stepped portion on one side. Accordingly, the housing protruding portion 215 of the fourth embodiment includes a first horizontal plane 215a located at the tip, a first vertical plane 215b extending vertically downward from one end of the first horizontal plane 215a, and a first vertical plane 215b. A second horizontal plane 215a ′ extending outward from the lower end of the first horizontal plane, a second vertical plane 215b ′ extending vertically downward from the outer end of the second horizontal plane 215a ′ to the base surface 204a of the housing, and the other of the first horizontal plane 215a. It comprises a third vertical surface 215b '' that extends vertically downward from the end to the base surface 204a of the housing. Also in this embodiment, when the envelope 208 of the drive circuit unit is fixed to the housing 204, the electric circuit elements of the drive circuit unit abut on the respective surfaces constituting the outer surface of the housing protruding portion 215. Compared with the third embodiment, since the stepped portion is formed only on the right side of FIG. 5, the first and second horizontal surfaces 215a, a ′ and the width of one base surface 204a are wide. As the electric circuit elements such as the switching element 210, the coil 211, and the capacitor 212 arranged to face each other, wide ones can be used.

  Next, a fifth embodiment will be described with reference to FIG. In this embodiment, the protruding shape of the protruding portion is a semi-convex shape similar to that of the fourth embodiment, and the protruding portion 215 of the housing 204 protrudes from the base surface 204a of the housing 204, and the protruding shape is stepped on one side. It has a semi-convex shape with a portion, and has first and second horizontal surfaces 215a, a ′, first and second and third vertical surfaces 215b, 215b ′, 215b ″. Moreover, although the arrangement of the electric circuit elements is similarly arranged, the configuration of the refrigerant passage is different. The refrigerant passage includes a first refrigerant passage 213a immediately below the first horizontal surface with which the switching element 210 abuts and a second refrigerant passage provided directly below one base surface 204a adjacent to the second vertical surface with which the capacitor 212 abuts. 213b. In general, the amount of heat generated and the heat resistance of various electric circuit elements constituting the drive circuit section vary greatly from element to element, and the degree of cooling required varies greatly. In this embodiment, the necessary degree of cooling is in the order of capacitor 212> switching element 210> coil 211, and therefore, the maximum refrigerant passage 213 b is disposed immediately below capacitor 212 and is relatively directly below switching element 210. A small refrigerant passage 213a is arranged in the front.

  In the embodiment described so far, the refrigerant passage and the drive circuit unit are arranged on the upper side of the motor unit. However, they are also arranged at arbitrary positions such as the right side, the left side, or the diagonally upper right side of the motor unit. it can. Accordingly, terms relating to directions such as “horizontal”, “vertical”, “top”, “bottom”, “right”, and “left” as used herein and in the claims are not absolute, When the refrigerant passage and the drive circuit section are arranged at positions different from those in the embodiment, the refrigerant passage and the drive circuit section are changed relative.

1 is a longitudinal sectional view schematically showing an electric compressor according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, schematically showing a cross-section of the drive circuit unit and the motor unit according to the first embodiment. It is a cross-sectional view similar to FIG. 2 schematically showing a drive circuit unit and a motor unit according to the second embodiment. It is a cross-sectional view similar to FIG. 2 schematically showing a drive circuit unit and a motor unit according to a third embodiment. It is a cross-sectional view similar to FIG. 2 schematically showing a drive circuit unit and a motor unit according to a fourth embodiment. It is a cross-sectional view similar to FIG. 2 schematically showing a drive circuit unit and a motor unit according to a fifth embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Motor part 4 Motor part housing 4a Housing base surface 5 Drive circuit part 8 Enclosure 9 Stator 15 Housing protrusion part 15a Horizontal surface 15b Vertical surface 16 Enclosure recessed part

Claims (11)

A motor part (3) having at least a rotor (11) having a rotating shaft (10), a stator (9), and a motor part housing (4) comprising a wall surrounding the stator (9); 8) and a drive circuit section (5) including an inverter for operating the motor section (3) therein, and a compression section (2) that is rotationally driven by the motor section (3) and compresses the fluid. ) And an integrated electric compressor,
The drive circuit section (5) is attached to the outer surface of the motor section housing (4) on the radially outer side of the rotor (11), and the fluid before being sucked into the compression section (2) and compressed. A refrigerant passage (13) for flowing through the inside of the motor part (3) as a cooling medium for the drive circuit part (5) and the motor part (3) is a side on which the drive circuit part (5) is attached. In the electric compressor formed by the inner surface of at least a part of the wall of the motor unit housing (4) and the outer peripheral surface of the stator (9) facing the inner surface,
A projecting portion (15) having a projecting shape projecting outward in the radial direction of the rotor is formed on the motor unit housing (4) on the side to which the drive circuit unit (5) is attached, and the projecting portion (15 The refrigerant passage (13) is formed so that the shape of the inner part of the outer casing is substantially similar to the protruding shape, and is attached to the motor part housing (4) of the envelope (8) of the drive circuit part. The motor part housing has a recessed part (16) corresponding to the protruding part (15) of the motor part housing (4), and the drive circuit part (5) covers the protruding part (15). By being attached to (4), the heat generated in the drive circuit section (5) is used for cooling in the refrigerant passage (13) through the outer surface of the projecting portion (15) of the motor section housing (4). of Characterized in that it is transmitted to the body, the electric compressor.   Electric compression according to claim 1, characterized in that the side of the drive circuit part (5) facing the motor part housing (4) consists of a non-covered surface not covered by the envelope (8). Machine.   The electric compressor according to claim 1 or 2, characterized in that the protruding shape projected on a plane orthogonal to the axis of the rotating shaft (10) is rectangular.   The electric compressor according to claim 1 or 2, characterized in that the protruding shape projected onto a plane orthogonal to the axis of the rotating shaft (10) is a trapezoid.   The electric compressor according to claim 1 or 2, characterized in that the protruding shape projected onto a plane orthogonal to the axis of the rotation axis (10) is a triangle.   The electric compressor according to claim 1 or 2, characterized in that the protruding shape projected onto a plane orthogonal to the axis of the rotation shaft (10) is a semicircular shape.   The projecting shape projected on a plane orthogonal to the axis of the rotating shaft (10) is a convex shape, that is, a first horizontal side at the uppermost end of the central portion and two vertically extending from both ends of the first horizontal side. Two first horizontal sides, two second horizontal sides extending substantially horizontally outward from respective lower ends of each of the first vertical sides, and two extending substantially vertically downward from respective outer ends of the respective second horizontal sides. The electric compressor according to claim 2, comprising two second vertical sides.   The projecting shape projected onto a plane orthogonal to the axis of the rotation axis (10) is a semi-convex shape having two shoulders on one side, that is, the first horizontal side at the uppermost end and one end of the side. A first vertical side extending substantially vertically downward; a second horizontal side extending substantially horizontally outward from a lower end of the first vertical side; and a second vertical side extending substantially vertically downward from an outer end of the second horizontal side; A third vertical side extending substantially vertically downward from the other end of the first horizontal side and having a length substantially equal to a length obtained by adding the lengths of the first vertical side and the second vertical side. The electric compressor according to claim 2, comprising three vertical sides.   A plurality of types of electric circuit elements having different sizes of inverters of the drive circuit unit (105) and at least one circuit board on which the plurality of types of electric circuit elements are mounted on the component mounting surface side of the circuit board (109) (109), and when the drive circuit section (105) is attached to the motor section housing (104), the component mounting surface of the circuit board (109) faces the motor section housing (104). The electric compressor according to claim 7, wherein the plurality of types of electric circuit elements are brought into contact with a first horizontal surface (115 a) of a housing protruding portion represented by the first horizontal side. And the first vertical surface (115b) and the second horizontal surface (115a ') of the protruding portion of the housing represented by the first vertical side and the second horizontal side, respectively. Ones (111), and characterized in that it comprises a second vertical surface of the housing projecting portion represented by the second vertical sides which abuts against the (115b ') (112), the electric compressor.   A plurality of types of electric circuit elements having different sizes of inverters of the drive circuit unit (205) and at least one circuit board on which the plurality of types of electric circuit elements are mounted on the component mounting surface side of the circuit board (209) (209), and when the drive circuit unit (205) is attached to the motor unit housing (204), the component mounting surface of the circuit board (209) faces the motor unit housing (204). The electric compressor according to claim 8, wherein the plurality of types of electric circuit elements are brought into contact with a first horizontal surface (215 a) of a housing protruding portion represented by the first horizontal side. And the first vertical surface (215b) and the second horizontal surface (215a ′) of the protruding portion of the housing represented by the first vertical side and the second horizontal side, respectively. Ones (211), and characterized in that it comprises a second vertical surface of the housing projecting portion represented by the second vertical sides which abuts against the (215b ') (212), the electric compressor.   A refrigerant passage extends substantially horizontally outward from the lower end of the first refrigerant passage (213a) directly below the first horizontal surface (215a) of the protruding portion of the motor portion housing and the second vertical surface (215b). 204) and the second refrigerant passage (213b) provided immediately below the base surface (204a) of the motor unit housing extending to the end of 204), and the electric circuit element is in contact with the first horizontal surface (215a) (210), the first vertical surface (215b) and the second horizontal surface (215a ′) abutting (211), the second vertical surface (215b ′) and the base surface (204a) 11. The electric compressor according to claim 10, characterized in that it includes one that is in contact (212).

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