JP7562774B2 - Electric motor control device - Google Patents

Description

The present invention relates to an electric motor control device.

Conventionally, there is known an electric compressor that includes a motor, a compression mechanism that is rotated by the output of the motor, a housing that contains them, and a circuit section that drives and controls the motor (see, for example, Patent Document 1). Patent Document 1 discloses that the lead pins of the motor terminals that are connected to the terminals of the motor inside the housing are connected to the terminal sections of the power board.

JP 2014-101823 A

In the electric compressor of Patent Document 1, the lead pin of the motor terminal is directly connected to the terminal portion of the power board. Therefore, when vibrations of the motor and compression mechanism housed in the housing are transmitted to the lead pin, there is a possibility that excessive stress will be applied to the lead pin and the terminal portion of the power board. Therefore, rather than directly connecting the lead pin to the terminal portion of the power board, it is conceivable to electrically connect the lead pin and the terminal portion of the power board via another member that allows vibration.

However, when electrically connecting the lead pin and the terminal portion of the power board via another member, it is necessary to join the lead pin and the other member by soldering or welding, and to join the terminal portion of the power board and the other member by soldering or welding. In other words, compared to when the lead pin is directly connected to the terminal portion of the power board, the number of joints that need to be soldered or welded increases, and the amount of work required for manufacturing increases.

The present invention was made in consideration of these circumstances, and aims to provide an electric motor control device that can improve the workability required to electrically connect at least three connection terminals of an electric motor to at least three connection terminals of a control board.

In order to solve the above problems, the electric motor control device of the present invention employs the following means.
An electric motor control device according to one embodiment of the present invention comprises an electric motor, a control board that controls the electric motor, and a metal connection portion that electrically connects the electric motor and the control board, wherein the electric motor has at least three first connection terminals, the control board has at least three second connection terminals corresponding to the first connection terminals, the connection portion has a joint portion joined to the first connection terminal by soldering or welding, and an axial connecting portion having one end connected to the joint portion and the other end joined to the second connection terminal by soldering or welding, and the at least three second connection terminals are arranged in the same straight line on the control board.

According to an electric motor control device according to one aspect of the present invention, at least three axial first connection terminals of the electric motor and at least three second connection terminals of the control board are electrically connected by metal connection parts. The connection parts have joint parts and coupling parts, and the joint parts are joined to the first connection terminals by soldering or welding, and the coupling parts are joined to the second connection terminals by soldering or welding.

And because the at least three second connection terminals are arranged on the same straight line on the control board, when joining the at least three second connection terminals by soldering or welding, the amount of movement of the tool used for soldering or welding is minimized and there is no need to change the direction of movement. This improves the workability of the work required to electrically connect the at least three connection terminals of the electric motor and the at least three connection terminals of the control board.

In an electric motor control device according to one aspect of the present invention, the control board is fixed to a base via a pair of fasteners, and at least three of the second connection terminals are preferably arranged in an area on the control board between the pair of fastening positions on a straight line connecting the pair of fastening positions where the pair of fasteners are fastened.

With the electric motor control device of this configuration, the pair of fastening positions are reliably fixed to the base. Therefore, the at least three second connection terminals arranged in the area between the pair of fastening positions on the line connecting the pair of fastening positions are less displaced relative to the base than when they are arranged in other positions, and are less susceptible to stress due to vibrations of the electric motor, etc.

In an electric motor control device according to one aspect of the present invention, it is preferable that the at least three first connection terminals are arranged on the same straight line, and the first straight line on which the at least three first connection terminals are arranged is a straight line parallel to the second straight line on which the at least three second connection terminals are arranged.

According to the electric motor control device of this configuration, since at least three first connection terminals are arranged on the same straight line, when joining the at least three first connection terminals by soldering or welding, the movement amount of the tool performing the soldering or welding is minimized and there is no need to change the movement direction. In addition, since the first straight line on which the at least three first connection terminals are arranged and the second straight line on which the at least three second connection terminals are arranged are parallel, after joining the at least three first connection terminals by soldering or welding, when moving the tool to join the at least three second connection terminals by soldering or welding, the movement amount of the tool can be reduced.

In the electric motor control device having the above configuration, it is preferable that, when the control board is viewed in a plan view, an end of the control board is disposed at a position sandwiched between the first straight line and the second straight line.
In this way, when the control board is viewed in plan, at least three first connection terminals are disposed at positions spaced apart from the end of the control board.

When the control board is viewed in a plan view, the at least three first connection terminals are not hidden by the control board, so there is no need to make a detour to avoid contact with the control board when moving a tool for soldering or welding. In addition, when the control board is viewed in a plan view, the at least three first connection terminals are visible, so soldering or welding can be performed with a tool while capturing an image of the first connection terminals with a camera, for example.

In an electric motor control device according to one aspect of the present invention, it is preferable that the at least three first connection terminals are formed in an axial shape, and the joint portion is a plate-shaped member having a joint surface wider than the first connection terminals.
Since the plate-shaped joint portion has a wider joint surface than the shaft-shaped first connection terminal, it is easy to join the joint portion and the first connection terminal by soldering or welding, etc., and sufficient joint strength can be obtained.

An electric motor control device according to one aspect of the present invention preferably comprises a housing forming an enclosed internal space and a compression unit housed in the internal space, and the electric motor is preferably configured to rotate a drive shaft housed in the internal space and driving the compression unit.
In an electric motor control device equipped with a compression section driven by an electric motor, the workability can be improved in the work required to electrically connect at least three connection terminals of the electric motor to at least three connection terminals of the control board.

The present invention provides an electric motor control device that can improve the workability required to electrically connect at least three connection terminals of an electric motor to at least three connection terminals of a control board.

1 is a side view showing an inverter-integrated electric compressor according to an embodiment of the present invention. 2 is a perspective view showing an inverter device incorporated in the inverter-integrated electric compressor shown in FIG. 1 . 3 is a partial enlarged view of the vicinity of a connection portion shown in FIG. 2; FIG. 4 is a view of the vicinity of the connection portion shown in FIG. 3 as viewed along the Y axis. 4 is a plan view of the vicinity of the connection portion shown in FIG. 3 as viewed from above. 4 is a view of the vicinity of the connection portion shown in FIG. 3 as viewed along the X-axis. 4 is a flowchart showing a method for manufacturing an inverter device according to an embodiment of the present invention. 4 is a partially enlarged view of the vicinity of the connection portion shown in FIG. 3 as viewed along the Y axis, illustrating a joining process of the motor connection terminal and the joint portion. FIG. 4 is a partially enlarged view of the vicinity of the connection portion shown in FIG. 3 as viewed along the Y axis, illustrating a joining process of the motor connection terminal and the joint portion. FIG. 4 is a partially enlarged view of the vicinity of the connection portion shown in FIG. 3 as viewed along the Y axis, illustrating a joining process of the motor connection terminal and the joint portion. FIG. 4 is a partially enlarged view of the vicinity of the connection portion shown in FIG. 3 taken along the Y axis, showing a process of joining the through hole and the coupling portion; FIG. 4 is a plan view of the vicinity of the connection portion shown in FIG. 3 as viewed from above, showing the position of a tool. FIG.

Below, an inverter-integrated electric compressor (electric motor control device) 100 according to one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing the inverter-integrated electric compressor 100 according to this embodiment. FIG. 2 is a perspective view showing the inverter device 40 incorporated in the inverter-integrated electric compressor shown in FIG. 1.

As shown in FIG. 1, the inverter-integrated electric compressor 100 includes a housing (casing) 10 that forms a sealed internal space, a compressor (compression unit) 20 housed in the internal space of the housing 10, an electric motor 30 housed in the internal space of the housing 10, an inverter device 40 having a control board 41b that controls the electric motor 30, and a connection unit 50 that electrically connects the electric motor 30 and the inverter device 40. The inverter-integrated electric compressor 100 of this embodiment is a compressor used in a vehicle air conditioner, and is a device that drives the compressor 20 by the electric motor 30 whose drive rotation speed is controlled by the inverter device 40.

The housing 10 has a compressor housing 11 that houses the compressor 20, and a motor housing 12 that houses the electric motor 30. The housing 10 forms a sealed internal space by connecting the compressor housing 11 and the motor housing 12 with bolts 13. The housing 10 is made of, for example, an aluminum alloy.

The rear end of the motor housing 12 (the right end in FIG. 1) is provided with a refrigerant suction port 14 that draws in low-pressure refrigerant gas. The front end of the compressor housing 11 (the left end in FIG. 1) is provided with a refrigerant discharge port 15 that discharges compressed refrigerant gas to the outside.

The motor housing 12 is provided at its outer periphery with an inverter accommodating section 16 for integrally incorporating the inverter device 40. The inverter accommodating section 16 is composed of an inverter box 17 that is molded integrally with the motor housing 12, and a junction box 18 that is integrally connected to the inverter box 17 via screws or the like. The junction box 18 also serves as a cover that closes the top of the inverter box 17.

The inverter box 17 has a generally rectangular shape in a plan view and has walls that rise upward around the periphery. A flange surface 17A for fixing the junction box 18 is formed on the top surface of the inverter box 17. The bottom surface on the inside side of the inverter box 17 is a flat surface on which the inverter module 41 that constitutes the inverter device 40 is installed. This flat surface is formed by the outer peripheral wall of the motor housing 12.

The junction box 18 is a box body for housing the inverter device 40, and is made of, for example, an aluminum alloy. The junction box 18 has the same rectangular shape as the inverter box 17 in a plan view, and a flange surface 18A is formed on the underside of the surrounding wall for integrally joining with the inverter box 17.

The compressor 20 is a device that compresses low-pressure refrigerant gas sucked in through the refrigerant suction port 14 and discharges it to the refrigerant discharge port 15. The compressor 20 is, for example, a scroll compressor having an orbiting scroll (not shown) connected to a drive shaft rotated by the electric motor 30 and a fixed scroll (not shown) fixed to the compressor housing 11.

The electric motor 30 includes a stator (not shown) that generates an AC magnetic field using AC current supplied from the inverter device 40, a rotor (not shown) that rotates due to magnetic force received from the AC magnetic field, and a drive shaft (not shown) that connects the rotor to the compressor 20. The electric motor 30 drives the compressor 20 by rotating the drive shaft.

The inverter device 40 has an inverter module 41 housed in the inverter box 17 and a noise removal filter circuit (not shown) housed in the junction box 18. As shown in FIG. 2, the inverter module 41 is a device in which a metal base plate (base) 41a and a control board 41b are integrated into a module via a number of spacers 41c. The metal base plate 41a is made of a rectangular aluminum alloy plate material and is fixed with screws so as to be in close contact with the flat outer peripheral wall of the motor housing 12, which is the bottom surface of the inverter box 17.

The control board 41b is a rectangular board that is connected to the vehicle control unit (ECU) via a communication line, transmits and receives control signals between the ECU, and has a control circuit mounted thereon that controls the AC power applied to the electric motor 30 based on the control signals. An intelligent power module (not shown) having UVW output terminals that output three-phase AC current to the electric motor 30 is mounted on the control board 41b. The control board 41b is integrated with the metal base plate 41a via multiple spacers 41c.

Figure 3 is a partial enlarged view of the vicinity of the connection portion 50 shown in Figure 2. As shown in Figure 3, the control board 41b has through holes (second connection terminals) 41b1, 41b2, and 41b3, which are three connection terminals that are electrically connected to the UVW output terminals of the intelligent power module.

The three through holes 41b1, 41b2, 41b3 are electrically connected to the motor connection terminals (first connection terminals) 31a1, 31a2, 31a3 of the insulating terminal portion 31 of the electric motor 30 by the connection portion 50. The through holes 41b1, 41b2, 41b3 are arranged at equal intervals along a first straight line L1 parallel to the X-axis shown in FIG. 3. Similarly, the motor connection terminals 31a1, 31a2, 31a3 are arranged at equal intervals along a second straight line L2 parallel to the X-axis shown in FIG. 3.

Figure 4 is a view of the vicinity of the connection portion 50 shown in Figure 3 as viewed along the Y axis. Figure 5 is a plan view of the vicinity of the connection portion 50 shown in Figure 3 as viewed from above. As shown in Figures 4 and 5, the insulating terminal portion 31 is attached to an opening 12A provided in the motor housing 12 by a fastening bolt 32. The insulating terminal portion 31 seals the opening 12A so that the internal space IS of the motor housing 12 does not communicate with the external space OS of the motor housing 12.

As shown in FIG. 5, in the control board 41b viewed in plan, the three through holes 41b1, 41b2, and 41b3 are arranged along the first straight line L1. That is, the three through holes 41b1, 41b2, and 41b3 are arranged on the same straight line. Furthermore, the three motor connection terminals 31a1, 31a2, and 31a3 are arranged along the second straight line L2. That is, the three motor connection terminals 31a1, 31a2, and 31a3 are arranged on the same straight line. Since the first straight line L1 and the second straight line L2 are parallel to the X-axis, the first straight line L1 is a straight line parallel to the second straight line L2.

As shown in FIG. 4, the control board 41b is disposed with a gap between it and the metal base plate 41a via a plurality of spacers 41c. The control board 41b is fixed to the metal base plate 41a by a plurality of fastening bolts (fasteners) 41d. As shown in FIG. 4 and FIG. 5, the three through holes 41b1, 41b2, 41b3 are disposed in the control board 41b in an area between a first fastening position P1 and a second fastening position P2 on a first straight line L1 connecting a pair of fastening bolts 41d.

As shown in FIG. 5, end 41b4 of control board 41b is disposed on a line extending parallel to first line L1 and second line L2. When control board 41b is viewed from above, end 41b4 of control board 41b is disposed at a position sandwiched between first line L1 and second line L2. In other words, when control board 41b is viewed from above, it is disposed so that each of the three through holes 41b1, 41b2, 41b3 and the three motor connection terminals 31a1, 31a2, 31a3 can be seen.

As shown in Figures 3 and 4, the insulating terminal portion 31 has motor connection terminals 31a1, 31a2, and 31a3 that electrically connect the electric motor 30 and the connection portion 50, a metal plate 31b that is attached to the motor housing 12 by a fastening bolt 32, and an insulator 31c that is arranged to surround the motor connection terminals 31a1, 31a2, and 31a3.

The three motor connection terminals 31a1, 31a2, and 31a3 shown in Figures 3 and 4 are electrically connected to the U terminal, V terminal, and W terminal of the electric motor 30, respectively. The motor connection terminals 31a1, 31a2, and 31a3 are formed in a shaft shape that protrudes from the internal space IS of the motor housing 12 to the external space OS. The motor connection terminals 31a1, 31a2, and 31a3 are formed integrally with the vitrified body (not shown), and are insulated from the metal plate 31b by the vitrified body.

The insulator 31c is a member formed into a substantially cylindrical shape using an insulating material, and the motor connection terminals 31a1, 31a2, and 31a3 are inserted through the inside of the insulator 31c. The insulator 31c ensures an insulation distance between the connection portion 50 and the metal plate 31b.

The connection portion 50 is a metal member that electrically connects the motor connection terminal 31a1 to the through hole 41b1, the motor connection terminal 31a2 to the through hole 41b2, and the motor connection terminal 31a3 to the through hole 41b3. The connection portion 50 is formed, for example, by punching a metal sheet.

The connection parts 50 are provided corresponding to the three motor connection terminals 31a1, 31a2, and 31a3. The connection parts 50 have plate-shaped joint parts 51 that are joined to the motor connection terminals 31a1, 31a2, and 31a3, and a shaft-shaped coupling part 52 that is connected at one end to the joint part 51 and at the other end to the through holes 41b1, 41b2, and 41b3.

Figure 6 is a view of the vicinity of the connection portion 50 shown in Figure 3, taken along the X-axis. As shown in Figure 6, the joint portion 51 has a width W2 that is wider than the width W1 of the motor connection terminal 31a3 in the Y-axis direction. As shown in Figure 5, the surface of the joint portion 51 facing the motor connection terminal 31a3 forms a joint surface 51a that is joined to the motor connection terminal 31a3. The motor connection terminal 31a3 and the joint surface 51a are joined by, for example, solder SO, which is an alloy of tin and lead. The motor connection terminal 31a3 and the joint surface 51a may also be joined by, for example, arc welding.

Note that FIG. 6 shows the connection portion 50 that connects the motor connection terminal 31a3 and the through hole 41b3, but the structure of the connection portion 50 that connects the motor connection terminal 31a1 and the through hole 41b1, and the connection portion 50 that connects the motor connection terminal 31a2 and the through hole 41b2 are similar, so their explanations are omitted.

The connecting portion 52 is an axial member formed so that the cross-sectional shape at each position is substantially the same, and has a first arm 52a extending along the first axis A1, a second arm 52b extending along the second axis A2 perpendicular to the first axis A1, and a third arm 52c extending along the third axis A3 perpendicular to the first axis A1. Since the first axis A1 and the second axis A2 are perpendicular to each other, the angle θ1 between the first axis A1 and the second axis A2 is 90°. Furthermore, since the first axis A1 and the third axis A3 are perpendicular to each other, the angle θ2 between the first axis A1 and the third axis A3 is 90°.

The angle θ1 between the first axis A1 and the second axis A2 may be other angle than 90° and not including 0°, so that the first axis A1 and the second axis A2 intersect. Similarly, the angle θ2 between the first axis A1 and the third axis A3 may be other angle than 90° and not including 0°, so that the first axis A1 and the third axis A3 intersect.

The first arm 52a is an axial member having one end connected to the second arm 52b and the other end connected to the third arm 52c. As shown in FIG. 6, the first arm 52a extends in a direction perpendicular to the direction parallel to the Z axis along which the motor connection terminal 31a3 extends. The first arm 52a is disposed at a position sandwiched between the joint 51 and the control board 41b in the direction along the Z axis.

Since the first arm 52a is disposed at a position sandwiched between the joint 51 and the control board 41b, a part of the first arm 52a (the part corresponding to width W2 in FIG. 6) overlaps with the joint 51 in the Y-axis direction. Therefore, the length of the connecting part 52 in the Y-axis direction can be made smaller than when they do not overlap.

A first gap 53a of a predetermined distance or more is formed in the Z-axis direction between the first arm 52a and the joint 51. The first gap 53a is a gap that prevents the first arm 52a from contacting the joint 51 when the connecting portion 52 elastically deforms due to vibration and the elastic deformation is equal to or less than a desired amount of deformation.

The second arm 52b is an axial member having one end connected to the first arm 52a and the other end joined to the through-hole 41b3. The end of the second arm 52b on the control board 41b side is inserted into the through-hole 41b3 and joined with solder SO. The second arm 52b is electrically connected to the through-hole 41b3 by being joined to the through-hole 41b3 with solder SO.

The third arm 52c is an axial member having one end connected to the joint 51 and the other end connected to the first arm 52a. The third arm 52c is connected to the joint 51 at a position farthest from the control board 41b in the Z-axis direction. Therefore, the length of the third arm 52c is longer than when it is connected to the joint 51 at a position closer to the control board 41b in the Z-axis direction.

A second gap 53b of a predetermined distance or more is formed in the Y-axis direction between the third arm 52c and the joint 51. The second gap 53b is a gap that prevents the third arm 52c from contacting the joint 51 when the connecting portion 52 elastically deforms due to vibration and the elastic deformation is equal to or less than a desired amount of deformation.

As shown in FIG. 6, the connecting portion 52 in this embodiment has one end connected to the joint portion 51 and the other end connected to the through hole 41b3 of the control board 41b. Therefore, when the relative position of the control board 41b to the motor housing 12 in the XYZ space changes due to vibration of the compressor 20 and the electric motor 30, the position of the connecting portion 52 and the through hole 41b3 of the second arm portion 52b relative to the joint portion 51 changes.

The connecting portion 52 of this embodiment has three bends that allow the direction in which the arms extend to change in response to changes in the position of the joint between the second arm 52b and the through hole 41b3 relative to the joint 51. The first bend B1 is formed at the connection position between the first arm 52a and the second arm 52b. The second bend B2 is formed at the connection position between the first arm 52a and the third arm 52c. The third bend B3 is formed at the connection position between the third arm 52c and the joint 51.

When the position of the joint between the second arm 52b and the through hole 41b3 of the joint 51 changes to be closer to the joint 51, the angle θ1 of the first bend B1 and the angle θ2 of the second bend B2 are reduced, and the third arm 52c is displaced so that the third bend B3 widens the second gap 53b. This causes the shaft-shaped joint 52 to contract. The contraction of the joint 52 follows the change in the position of the through hole 41b3 relative to the joint 51. This reduces the stress on the joint between the joint 52 and the motor connection terminal 31a3 and the joint between the joint 52 and the through hole 41b3.

When the position of the joint portion of the second arm portion 52b with the through hole 41b3 relative to the joint portion 51 changes so as to move away from the joint portion 51, the angle θ1 of the first bend portion B1 and the angle θ2 of the second bend portion B2 are increased, and the third arm portion 52c is displaced so that the third bend portion B3 narrows the second gap 53b. This causes the axially formed joint portion 52 to be stretched. By stretching the joint portion 52, it follows the change in the position of the through hole 41b3 relative to the joint portion 51. This reduces the stress on the joint portion between the joint portion 52 and the motor connection terminal 31a3 and the joint portion between the joint portion 52 and the through hole 41b3.

Note that, in the above, the contraction and expansion of the connecting part 52 in response to vibration has been described with reference to the YZ plane shown in FIG. 6, but the same is true in the XY and XZ planes. That is, since the connecting part 52 has a mechanism for contracting and expanding in response to vibration, it displaces in response to displacement in any direction in the XYZ space so as to reduce stress on the joint between the connecting part 52 and the motor connection terminal 31a3 and the joint between the connecting part 52 and the through hole 41b3.

Next, referring to FIG. 7, a method for manufacturing the inverter device 40 according to this embodiment will be described. In the following description, only some of the steps in the method for manufacturing the inverter device 40 will be described, and other steps will be omitted. Specifically, only the joining step between the motor connection terminals 31a1, 31a2, and 31a3 and the through holes 41b1, 41b2, and 41b3 will be described, and other steps will be omitted.

In step S101, the worker who manufactures the inverter device 40 places the insulating terminal portion 31 in the opening 12A of the motor housing 12 and fastens the fastening bolt 32 through the through hole formed in the metal plate 31b. This places the insulating terminal portion 31 in the opening 12A of the motor housing 12.

In step S102, the worker manufacturing the inverter device 40 installs the control board 41b on the motor housing 12. Specifically, the worker fixes the metal base plate 41a to the flat outer wall of the motor housing 12 with screws (not shown). The worker also positions the control board 41b with a gap between it and the metal base plate 41a via multiple spacers 41c, and fixes the control board 41b to the metal base plate 41a with fastening bolts 41d. As a result, the control board 41b is fixed to the motor housing 12 via the metal base plate 41a.

In step S103, the worker who manufactures the inverter device 40 joins each of the motor connection terminals 31a1, 31a2, and 31a3 to the joint 51 of the connection portion 50 by soldering or welding. Here, an example of joining each of the motor connection terminals 31a1, 31a2, and 31a3 to the joint 51 by soldering will be described with reference to Figures 8 to 10. Figures 8 to 10 are partial enlarged views of the vicinity of the connection portion 50 shown in Figure 3 as viewed along the Y axis.

8 to 10, the symbol T indicates a tool for melting solder. The tool T is, for example, a soldering robot that can move to any position in the XYZ space and automatically supply solder. The worker can cause the tool T to solder the motor connection terminals 31a1, 31a2, 31a3 to the joint 51 by setting in advance, in a control device (not shown) that controls the tool T, the position at which the motor connection terminals 31a1, 31a2, 31a3 are to be joined to the joint 51.

In step S103, the worker who manufactures the inverter device 40 temporarily attaches the three connection parts 50 to the motor connection terminals 31a1, 31a2, and 31a3 with adhesive or the like before soldering with the tool T. At that time, the worker makes sure that the ends of the second arm part 52b are inserted into the through holes 41b1, 41b2, and 41b3, respectively.

Then, the worker who manufactures the inverter device 40 operates a control device (not shown) that controls the tool T. The control device is preset to solder the motor connection terminal 31a1 to the joint 51, then solder the motor connection terminal 31a2 to the joint 51, and finally solder the motor connection terminal 31a3 to the joint 51.

First, the tool T moves to the position of the motor connection terminal 31a2. Then, the tool T melts the solder between the motor connection terminal 31a1 and the joint 51 while moving, for example, from top to bottom along the Z axis, and joins the motor connection terminal 31a1 and the joint 51 with the solder (see FIG. 8). As shown in FIG. 9, the motor connection terminal 31a1 and the joint 51 are joined by the solidified solder SO.

Secondly, the tool T moves to the position of the motor connection terminal 31a2. Then, the tool T melts the solder between the motor connection terminal 31a2 and the joint 51 while moving, for example, from top to bottom along the Z axis, and joins the motor connection terminal 31a2 and the joint 51 with the solder (see FIG. 9). As shown in FIG. 10, the motor connection terminal 31a2 and the joint 51 are joined by the solidified solder SO.

Thirdly, the tool T moves to the position of the motor connection terminal 31a3. Then, the tool T melts the solder between the motor connection terminal 31a3 and the joint 51 while moving, for example, from top to bottom along the Z axis, and joins the motor connection terminal 31a3 and the joint 51 with the solder (see FIG. 10). As shown in FIG. 11, the motor connection terminal 31a3 and the joint 51 are joined by the solidified solder SO.

In step S104, the worker manufacturing the inverter device 40 joins the through holes 41b1, 41b2, and 41b3 to the connecting portion 52 by soldering or welding. An example of joining each of the through holes 41b1, 41b2, and 41b3 to the connecting portion 52 by soldering will now be described with reference to Figures 11 and 12. Figure 11 is a partially enlarged view of the vicinity of the connecting portion 50 shown in Figure 3 as viewed along the Y axis. Figure 12 is a plan view of the vicinity of the connecting portion 50 shown in Figure 3 as viewed from above, showing the position of the tool T.

The operator can have the tool T solder the through holes 41b1, 41b2, 41b3 and the connecting portion 52 by setting the positions for joining the through holes 41b1, 41b2, 41b3 and the connecting portion 52 in advance in a control device (not shown) that controls the tool T.

In step S104, the worker who manufactures the inverter device 40 operates a control device (not shown) that controls the tool T. The control device is preset to solder the through hole 41b1 to the connecting portion 52, then solder the through hole 41b2 to the connecting portion 52, and finally solder the through hole 41b3 to the connecting portion 52.

In step S104, tool T moves to the position of through hole 41b1, melts solder in through hole 41b1, and joins through hole 41b1 to the end of second arm 52b. Then, tool T moves to the position of through hole 41b2, melts solder in through hole 41b2, and joins through hole 41b2 to the end of second arm 52b.

Finally, the tool T moves to the position of the through hole 41b3, melts the solder in the through hole 41b3, and joins the through hole 41b3 to the end of the second arm portion 52b. As shown in FIG. 11, the through holes 41b1, 41b2, 41b3, and the connecting portion 52 are joined by the solidified solder SO. In this way, the motor connection terminals 31a1, 31a2, and 31a3 and the through holes 41b1, 41b2, and 41b3 are electrically joined via the connecting portion 50.

As shown in FIG. 12, when the control board 41b is viewed in a plan view, the three motor connection terminals 31a1, 31a2, and 31a3 are not hidden by the control board 41b, so there is no need to make a detour to avoid contact with the control board 41b when moving the tool T for soldering or welding. In addition, when the control board 41b is viewed in a plan view, the three motor connection terminals 31a1, 31a2, and 31a3 are visible, so soldering or welding can be performed with the tool T while capturing an image of the motor connection terminals 31a1, 31a2, and 31a3 with a camera or the like.

The above describes an example in which the motor connection terminals 31a1, 31a2, 31a3 are joined to the connection portion 50, and the through holes 41b1, 41b2, 41b3 are joined to the connection portion 50 by soldering, but the same applies to welding. For example, when joining by arc welding, the tool T melts a part of the motor connection terminals 31a1, 31a2, 31a3 and a welding rod (not shown) instead of melting solder. Also, the tool T melts a part of the through holes 41b1, 41b2, 41b3 and a welding rod (not shown) instead of melting solder.

The operation and effects of the inverter-integrated electric compressor 100 according to the present embodiment described above will be described.
According to the inverter-integrated electric compressor 100 of this embodiment, at least three axial motor connection terminals 31a1, 31a2, 31a3 of the electric motor 30 and three through holes 41b1, 41b2, 41b3 of the control board 41b are electrically connected by a metallic connection portion 50. The connection portion 50 has a joint portion 51 and a coupling portion 52, and the joint portion 51 is joined to the motor connection terminals 31a1, 31a2, 31a3 by soldering or welding, and the coupling portion 52 is joined to the through holes 41b1, 41b2, 41b3 by soldering or welding.

And because the three through holes 41b1, 41b2, 41b3 are arranged on the same straight line on the control board 41b, when joining the three through holes 41b1, 41b2, 41b3 by soldering or welding, the movement amount of the tool T performing the soldering or welding is minimized and there is no need to change the movement direction. Therefore, it is possible to improve the workability required to electrically connect the three motor connection terminals 31a1, 31a2, 31a3 of the electric motor 30 to at least the three through holes 41b1, 41b2, 41b3 of the control board 41b.

In addition, according to the inverter-integrated electric compressor 100 of this embodiment, the first fastening position P1 and the second fastening position P2 are reliably fixed to the metal base plate 41a. Therefore, the through holes 41b1, 41b2, and 41b3 arranged in the area between a pair of fastening positions on the second straight line L2 connecting the first fastening position P1 and the second fastening position P2 are less displaced relative to the metal base plate 41a than when they are arranged in other positions, and are less susceptible to stress due to vibrations of the compressor 20 and the electric motor 30, etc.

In addition, according to the inverter-integrated electric compressor 100 of this embodiment, the three motor connection terminals 31a1, 31a2, and 31a3 are arranged on the same straight line, so when joining the three motor connection terminals 31a1, 31a2, and 31a3 by soldering or welding, the amount of movement of the tool T used for soldering or welding is minimized and there is no need to change the direction of movement.

In addition, since the first straight line L1 on which the three motor connection terminals 31a1, 31a2, and 31a3 are arranged is parallel to the second straight line L2 on which the three through holes 41b1, 41b2, and 41b3 are arranged, when moving the tool T to join the three through holes 41b1, 41b2, and 41b3 by soldering or welding after joining the three motor connection terminals 31a1, 31a2, and 31a3 by soldering or welding, the amount of movement of the tool T can be reduced.

In addition, according to the inverter-integrated electric compressor 100 of this embodiment, when the control board 41b is viewed in a plan view, the three motor connection terminals 31a1, 31a2, and 31a3 are arranged at a position separated from the end 41b4 of the control board 41b. When the control board 41b is viewed in a plan view, the three motor connection terminals 31a1, 31a2, and 31a3 are not hidden by the control board 41b, so there is no need to make a detour to avoid contact with the control board 41b when moving the tool T for soldering or welding. In addition, when the control board 41b is viewed in a plan view, the three motor connection terminals 31a1, 31a2, and 31a3 are visible, so soldering or welding can be performed with the tool T while capturing an image of the motor connection terminals 31a1, 31a2, and 31a3 with a camera or the like.

In addition, according to the inverter-integrated electric compressor 100 of this embodiment, the plate-shaped joint 51 has a larger area and heat capacity than the motor connection terminals 31a1, 31a2, and 31a3, so that it is easy to join the joint 51 and the motor connection terminals 31a1, 31a2, and 31a3 by soldering or welding, and sufficient joint strength can be obtained.

Other Embodiments
In the above description, the electric motor 30 has three motor connection terminals 31a1, 31a2, and 31a3, and the control board 41b has three through holes 41b1, 41b2, and 41b3, but other configurations are also possible. For example, the electric motor 30 may have four or more motor connection terminals, and the control board 41b may have four or more corresponding through holes. In other words, the electric motor 30 may have at least three motor connection terminals, and the control board may have at least three through holes.

10 Housing
11 Compressor housing 12 Motor housing 12A Opening 20 Compressor (compression section)
30 Electric motor 31 Insulated terminal portion 31a1, 31a2, 31a3 Motor connection terminal (first connection terminal)
40 Inverter device 41 Inverter module 41a Metal base plate (base)
41b Control board 41b1, 41b2, 41b3 Through hole (second connection terminal)
41b4 End 41c Spacer 41d Fastening bolt (fastener)
50 Connection portion 51 Joint portion 51a Joint surface 52 Connection portion 100 Inverter-integrated electric compressor (electric motor control device)
IS Internal space L1 First straight line L2 Second straight line OS External space P1 First fastening position P2 Second fastening position SO Solder T Tool

Claims (5)

An electric motor;
A control board for controlling the electric motor;
a metal connection portion that electrically connects the electric motor and the control board,
the electric motor has at least three first connection terminals;
the control board has at least three second connection terminals corresponding to the first connection terminals;
The connection portion is
a joint portion joined to the first connection terminal by soldering or welding;
a shaft-shaped connecting portion having one end connected to the joint portion and the other end joined to the second connection terminal by soldering or welding;
At least three of the second connection terminals are arranged on the same straight line on the control board,
At least three of the first connection terminals are formed in an axial shape,
the joint portion is a plate-like member having a flat joint surface that is wider than the first connection terminal,
An electric motor control device in which, when the control board is viewed in a plane, an end of the control board is positioned between a first line on which at least three of the first connection terminals are arranged and a second line on which at least three of the second connection terminals are arranged, and at least three of the joining surfaces joined to the at least three first connection terminals are arranged so as to be parallel to each other . The control board is fixed to a base via a pair of fasteners;
The electric motor control device according to claim 1 , wherein at least three of the second connection terminals are arranged on the control board in an area sandwiched between a pair of fastening positions on a straight line connecting a pair of fastening positions at which the pair of fasteners are fastened. The electric motor control device according to claim 1 or 2, wherein the first straight line is a straight line parallel to the second straight line. 4. An electric motor control device as described in any one of claims 1 to 3, wherein when the control board is viewed in a plane, each of the at least three joining surfaces joined to the at least three first connection terminals is arranged so as to be perpendicular to the first straight line. A housing forming a sealed internal space;
A compression portion accommodated in the internal space,
The electric motor control device according to claim 1 , wherein the electric motor rotates a drive shaft that is housed in the internal space and drives the compression section.