Rotating electrical machine

Abstract

A rotary electric machine in which heat dissipation of a terminal block and a terminal of a coil of a stator provided with a plurality of sets of multiphase windings is not taken into consideration in a conventional rotary electric machine to which current is supplied. It is necessary to reduce heat generation of the terminal block and the terminal of the rotary electric machine, thereby achieving high output. The rotary electric machine of the present application includes a coil portion configured in a circular ring shape by a plurality of sets of multiphase windings, a cylindrical housing that surrounds the coil portion, a plurality of terminal blocks configured on one side in an axial direction of the stator in an arc shape, provided corresponding to each phase winding of each set, and connected to the windings, and a plurality of terminals respectively connected to the terminal blocks and configured in the housing via an insulating member.

Description

Technical Field

[0001] This application relates to a rotary electric motor. Background Technology

[0002] The use of rotary electric machines is expanding in a wide variety of fields, and in recent years there has been an increasing demand for higher output. As a structure for rotary electric machines, there exists a stator arranged to surround the outer periphery of the rotor. One known rotary electric machine has an iron core, an annular frame surrounding the iron core, and multiple sets of phase windings wound around the iron core, and is supplied with drive current from multiple drive circuits. By supplying current from multiple drive circuits, the output of the rotary electric machine can be increased (e.g., Patent Document 1 and Patent Document 2).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2000-175420

[0006] Patent Document 2: Japanese Patent Application Publication No. 2001-157487

[0007] In the rotary electric machines described in Patent Documents 1 and 2, a technique is disclosed that supplies current from multiple drive circuits to multiple sets of coils. However, these rotary electric machines do not address the heat generation of the terminal blocks and terminals (external terminals) that supply power to each set of coils. In rotary electric machines with increased output, the current path to each winding of the coil generates heat, thus hindering high output.

[0008] A rotating electric motor that receives current from multiple drive circuits is equipped with terminal blocks and terminals. The terminal blocks are configured for each phase that supplies power to multiple sets of windings, and the terminals supply current to each terminal block. The large current flow causes the terminal blocks and terminals to heat up. Sustained overheating of the terminal blocks and terminals can lead to functional degradation and shortened lifespan. Therefore, it is desirable to suppress the heating of the terminal blocks and terminals in order to improve the output of the rotating electric motor. Summary of the Invention

[0009] This application was made to solve the aforementioned problems, specifically to address the heat generation issue in the path of current supply to a stator with multiple sets of multi-phase windings. The aim is to provide a rotary motor that reduces heat generation at the terminal blocks and terminals of the stator with multiple sets of multi-phase windings, thereby achieving high output.

[0010] The rotary electric motor of this application has a stator, the stator comprising: a coil section, the coil section being formed by multiple sets of multiphase windings arranged in a circular shape; a cylindrical housing surrounding the coil section; multiple arc-shaped terminal blocks, the multiple terminal blocks being disposed on one side of the axial direction of the coil section, corresponding to each phase of each set of windings, and connected to the windings; and multiple terminals, the multiple terminals being respectively connected to the terminal blocks and disposed in the housing via an insulating member.

[0011] According to the rotary motor of this application, current is supplied to the stator with multiple sets of multiphase windings via multiple arc-shaped terminal blocks for each group, thereby reducing the heat generation of the terminal blocks and terminals and thus achieving high output of the rotary motor. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of the rotary motor according to Embodiment 1.

[0013] Figure 2 This is a perspective view of the stator of the rotary motor according to Embodiment 1.

[0014] Figure 3 This is a perspective view of the stator coil of the rotary electric motor according to Embodiment 1.

[0015] Figure 4 This is a perspective view of the insulating component of the stator of the rotary electric motor according to Embodiment 1.

[0016] Figure 5 This is a top view of the insulating component of the stator of the rotary electric motor according to Embodiment 1.

[0017] Figure 6 This is a top view of the stator of the rotary electric motor of Embodiment 1, which has an insulating member with a terminal holding groove.

[0018] Figure 7 This is a perspective view of the terminal block of the stator of the rotary motor according to Embodiment 1.

[0019] Figure 8 This is an enlarged view of the terminal block of the stator of the rotary motor in Embodiment 1.

[0020] Figure 9 This is a first assembly diagram of the stator of the rotary motor according to Embodiment 1.

[0021] Figure 10 This is a second assembly diagram of the stator of the rotary motor according to Embodiment 1.

[0022] Figure 11 This is a first cross-sectional view of the insulating component of the stator of the rotary electric motor according to Embodiment 1.

[0023] Figure 12This is the third assembly diagram of the stator of the rotary motor according to Embodiment 1.

[0024] Figure 13 This is a second cross-sectional view of the insulating component of the stator of the rotary electric motor according to Embodiment 1.

[0025] Figure 14 This is a perspective view showing the coil connection portion of the stator terminal block of the rotary electric motor according to Embodiment 1.

[0026] Figure 15 This is a perspective view of the stator terminals of the rotary electric motor according to Embodiment 1.

[0027] Figure 16 This is a perspective view showing the connection between the terminal block and the terminals of the stator of the rotary electric motor according to Embodiment 1.

[0028] Figure 17 This is a first schematic diagram showing the connection between the terminal block of the stator and the coil of the rotary electric motor according to Embodiment 1.

[0029] Figure 18 This is a second schematic diagram showing the connection between the terminal block and the coil of the stator of the rotary electric motor according to Embodiment 1.

[0030] Figure 19 This is a third schematic diagram showing the connection between the terminal block and the coil of the stator of the rotary electric motor according to Embodiment 1.

[0031] Figure 20 This is a perspective view showing the arrangement of the wiring board in the slot of the insulating member housed in the stator of the rotary electric motor of Embodiment 1.

[0032] Figure 21 This is a cross-sectional view showing the installation of the stator terminals of the rotary electric motor according to Embodiment 2.

[0033] Figure 22 This is a cross-sectional view showing the installation of the stator terminals of the rotary electric motor according to Embodiment 3.

[0034] (Symbol Explanation)

[0035] 100, 100a, 100b Rotary motors; 101 First control circuit; 102 Second control circuit; 210 Housing; 211 Frame; 213 Set; 215 Refrigerant flow path; 300, 300a, 300b Stator; 310 Coil; 311 Insulator; 311a Replacement Insulator; 312 Winding; 320 Terminal block; 340 Terminal; 350, 350a Terminal block; 360 Coil section. Detailed Implementation

[0036] Hereinafter, embodiments of the present application will be described with reference to the accompanying drawings.

[0037] 1. Implementation Method 1

[0038] <Structure of Rotary Electrical Machines>

[0039] Figure 1 This is a cross-sectional view of the rotary motor 100 of Embodiment 1 cut along the axis of rotation 401. The rotary motor 100 is surrounded by a housing 210, which has a bottomed cylindrical frame 211 and an end plate 212 that closes the opening of the frame 211. The housing 210 has a sleeve 213, and a refrigerant flow path 215, which serves as a passage for the refrigerant, i.e., cooling water, is formed in the portion enclosed by the frame 211 and the sleeve 213.

[0040] A stator 300 is fixed in an embedded state within the cylindrical portion of the frame 211. The stator 300 is also referred to as a stationary body. A rotor 400 is rotatably supported by bearings 2 on the bottom of the frame 211 and the end plate 212. The rotor 400 is also referred to as a rotating body. The rotor 400 is disposed on the inner circumferential side of the stator 300. Furthermore, in... Figure 1 The sectional view mainly describes the structure of the stator 300, therefore, it is depicted by reducing the area of ​​the rotor 400 and enlarging the area of ​​the stator 300.

[0041] The stator 300 includes: a plurality of coils 310 that generate magnetic flux; and a terminal block 320 that distributes current to the plurality of coils 310. The stator core 330 through which the magnetic flux passes is divided into a plurality of pole teeth 331 (in Figure 2 (As described in the text). A winding 312 is wound around each pole tooth 331 to form a coil 310. The stator 300 has coils 310 for each of the plurality of phases, and is powered on each phase from a terminal block 320 provided for each phase. Figure 1 The example shown is a rotary motor 100 with three-phase coils 310. However, the technology described in this application can also be applied to two-phase rotary motors and rotary motors with four or more phases. The coils 310, terminal block 320, and stator core 330 are electrically insulated from each other using insulating members 311.

[0042] The terminal block 320 is located on one side of the axial direction of the annular stator 300 (in Figure 1 The upper side is in the middle and is held by an insulating member 311. A plate-shaped terminal 340 for supplying power to the terminal block 320 is connected to the terminal block 320. The terminal 340 is held on the outer periphery of the frame 211, which serves as the container for the stator 300. The terminal 340 is provided with a power supply side connection portion 343 (described in the figure) for connecting to external power supply lines (e.g., connection lines connected to the control circuit). Figure 15 (Diagram of power supply line omitted). A terminal retaining groove 319 (described in the figure) is provided on a portion of the insulating member 311 (hereinafter referred to as the alternative insulating member 311a). Figure 6, Figure 16 ), and maintain a 340-degree connection terminal.

[0043] The rotor 400 is a permanent magnet rotor. A rotating shaft 401 is inserted into the axial position of the cylindrical rotor core 402. Permanent magnets 403 are embedded on the outer circumferential surface of the rotor core 402. The permanent magnets 403 are arranged at a predetermined interval along the circumference to form magnetic poles.

[0044] The rotor 400 is not limited to this type of permanent magnet rotor; a so-called cage rotor in which uninsulated rotor conductors are housed in slots in the rotor core 402 and short-circuited on both sides by short-circuit rings may also be used. Alternatively, a winding type rotor in which the windings are mounted in slots formed in the rotor core 402 may also be used.

[0045] <Structure of the stator>

[0046] Figure 2 This is a perspective view of the stator 300 of the rotary motor 100 according to Embodiment 1. Figure 3 This is a perspective view of the coil 310 of the stator 300 of the rotary motor 100 according to Embodiment 1. Three terminal blocks 320 are provided for each group of coils 310, corresponding to a three-phase configuration, and are connected to the coils 310 of each phase. Corresponding to the connection of the three terminal blocks 320 in each group, three terminals 340 are provided in each group. Here, a three-phase case is illustrated, but it could also be a two-phase rotary motor or a rotary motor with four or more phases.

[0047] The stator 300 is configured in a ring shape with coils 310 arranged at equal intervals. Each coil 310 includes: pole teeth 331 that divide the stator core 330 circumferentially; and a winding 312 wound around the pole teeth 331. Each coil 310 includes a yoke 332, which connects the circumferentially equally spaced radially arranged pole teeth 331 to the pole teeth 331 on the outer diameter side.

[0048] For the stator core 330, which is constructed by stacking multiple steel plates, an insulating member 311 made of insulating material covers the upper side of the stator core 330, and a lower insulating member 324 made of insulating material covers the lower side of the stator core 330. A winding 312, which is a conductor wire with an insulating film, is wound around the insulating member 311 and the lower insulating member 324. The winding 312 can also use copper wire, aluminum wire, or other conductors. The end wire 313 is led out along the axial direction.

[0049] The stator core 330 is divided circumferentially by a yoke 332 into the same number of segments as the pole teeth 331. In Embodiment 1, an example using a stator core segmented circumferentially is shown. However, it is also possible to use a stator core in which all the stator cores 330 are connected by the yoke 332 to form a single unit. Alternatively, a stator core in which the yoke 332 is connected by a thin wall and can be unfolded into a straight line can also be used.

[0050] For each pole tooth 331, in order to electrically isolate the winding 312 from the stator core 330, a sheet-shaped slot insulating gasket (Japanese: スロットセル) 314 made of insulating materials such as polyphenylene sulfide resin and meta-aramid fiber is used to abut against it. Insulating parts 311 and lower insulating parts 324 are covered and fixed at the upper and lower ends of the stator core 330. The slotting unit 314 can also be fixed by attaching double-sided tape to the side of the stator core 330.

[0051] <Insulating components>

[0052] Figure 4 This is a perspective view of the insulating member 311 of the stator 300 of the rotary motor 100 in Embodiment 1. Figure 5 This is a top view of the insulating member 311 of the stator 300 of the rotary motor 100 in Embodiment 1. Figure 6 This is a top view of the stator 300 of the rotary motor 100 of Embodiment 1, which is provided with a terminal holding groove 319 as a substitute for the insulating member 311a.

[0053] The insulating member 311 includes: a body 315 for winding the winding 312; and a wall portion 316 for positioning the winding 312 in a predetermined position. A retaining member portion 317 is provided on one side of the yoke portion 332 of the wall portion 316, the retaining member portion 317 having a comb-shaped groove portion 318 for positioning the terminal block 320.

[0054] The bottom of the groove 318 that holds the connecting plate 320 of the retaining part 317 is a recess that accommodates the adhesive material. In Embodiment 1, an example is shown in which the retaining part 317 is disposed on the side of the yoke 332 of the insulating part 311, but it can also be disposed on the side of the rotor 400.

[0055] It is set Figure 6 The alternative insulating member 311a to the terminal retaining groove 319 shown is used to fix the terminal 340 at the position. By clamping and fixing the terminal 340 into the terminal retaining groove 319, the position of the terminal 340 relative to the terminal block 320 can be accurately adjusted.

[0056] <Power strip>

[0057] Figure 7This is a perspective view of the terminal block 320 of the stator 300 of the rotary motor 100 in Embodiment 1. Figure 8 This is an enlarged view of the terminal block 320 of the stator 300 of the rotary motor 100 in Embodiment 1. Figure 8 It is Figure 7 The enlarged image of part A.

[0058] In Embodiment 1, as described below, each coil 310 is powered in parallel from the first control loop 101 and the second control loop 102, which are two sets of control loops, corresponding to the three-phase AC drive. Therefore, the terminal block 320 becomes a structure using six terminal blocks 320-U, 320-V, 320-W, 320-X, 320-Y, and 320-Z. Each phase terminal block 320 has a similar shape arranged in concentric circles. Here, an example of one terminal block 320 will be described.

[0059] The terminal block 320 of the stator 300 of the rotary motor 100 in Embodiment 1 is designed for high output and is used in drives that utilize large currents. Because a large current is supplied, a so-called busbar wiring system with plate-shaped wiring is used. The terminal block 320 for the busbar wiring system is manufactured by stamping and processing a strip-shaped conductive material.

[0060] The terminal block 320 is held in place of the insulating member 311, the retaining part 317 replacing the insulating member 311a, and as follows Figure 7 The shape shown is an arc. In embodiment 1, each coil 310 disposed on the ring is powered in two groups for each half-turn, therefore, the terminal block 320 is in the shape of a roughly semi-circular arc.

[0061] Corresponding to the number of groups or terminals 340 of the first control loop 101 and the second control loop 102, a terminal block 320 is constructed by wiring an arc-shaped busbar that is equivalent to the angle region of 360 degrees divided by the number of groups or terminals. The terminal block 320 for N groups of coils 310 is configured to supply power to the coils 310 in an angle region of 360 degrees / N. Furthermore, even if the number of control loops is less than N or is a single loop, the number of terminals 340 can be set to N, and each coil 310 can be supplied with power through the terminal block 320 in N groups. Alternatively, it can be configured to supply power to multiple groups of coils 310 from multiple drive circuits, including the upper arm, lower arm, etc. In this case, although it can be configured that a single control loop controls a single drive loop, it can also be configured that a single control loop controls multiple drive loops.

[0062] In the terminal block 320, relative to the main body portion that shapes the strip-shaped conductive element into an arc shape, Figure 7 and Figure 8The upper end of the coil 310 is provided with a coil connection portion 321 and a power supply portion 322. The coil connection portion 321 is connected to the end wire 313 and supplies power from the terminal block 320 to the winding 312 of the coil 310. The power supply portion 322 is connected to the terminal block 340 and is supplied with power through the terminal block 340. The terminal block 320 for the N groups of coils 310 can also be an arc shape with an angle area of ​​less than 360 degrees / N. This is because it is sufficient to distribute current from the power supply portion 322 included in each terminal block 320 to the coil connection portion 321.

[0063] exist Figure 7 In this configuration, there are six coils 310 connected to a terminal block 320, and coil connection portions 321 are provided at six locations. The aforementioned coil connection portions 321 and power supply portions 322 extend axially upwards from the main body of the terminal block 320 toward the stator 300 to form protrusions. The power supply portions 322 have a pair of adjacent protrusions, with a recess between the pair of protrusions. Furthermore, each protrusion is configured with a chamfer at its front end, thereby facilitating connection to the terminal block 340 (described later). Figure 15 The opening 341 of the terminal 340 is inserted. In addition, the radial protrusion 342 provided between the two openings 341 of the terminal 340 is clamped and fixed by a pair of power supply parts 322.

[0064] Regarding the position where the terminal 340 connects to the terminal block 320, it can also be positioned near the center relative to the entire length of the terminal block 320. This is because by uniformly distributing the current flowing in the terminal block 320, heat generation due to localized increases in current density is prevented. Specifically, by setting the number of coil connection portions 321 arranged on both sides of the power supply section 322 to be the same or differing by 1, corresponding to whether the number of coil connection portions 321 connected to the terminal block 320 is even or odd, the magnitude of the current distributed to both sides of the terminal block 320 can be made uniform.

[0065] In the terminal block 320, Figure 7 and Figure 8 A fixing part 323 is provided on the lower side of the terminal block 320, which is connected to the insulating member 311. The fixing part 323 is located on the opposite side of the stator 300 axially compared to the main body of the terminal block 320. Figure 7 , Figure 8 The protrusion extending from the lower side (the middle part).

[0066] <Stator Assembly>

[0067] Figure 9This is a first assembly diagram of the stator 300 of the rotary electric motor 100 according to Embodiment 1. It shows a state in which thirty-six coils 310, each equipped with an insulating member 311, a lower insulating member 324, etc., and wound with a winding 312, are arranged in a circular shape in the stator core 330. This state is referred to as the coil section 360.

[0068] Figure 10 This is a second assembly diagram of the stator 300 of the rotary motor 100 according to Embodiment 1. The coils 360, with coils 310 arranged in a circular ring, are pressed into the frame 211 and integrated. Here, the stator cores 330 can be integrated with each other by welding, bonding, or other methods.

[0069] Figure 11 This is a first cross-sectional view of the insulating member 311 of the stator 300 of the rotary motor 100 according to Embodiment 1. It is a cross-sectional view showing the insulating member 311 assembled to the coil 310 cut along the axis of the rotating shaft 401 of the rotary motor 100.

[0070] After the coil 310 is pressed into the frame 211 and integrated, preparations are made to fix the terminal block 320 to the insulating member 311. The bottom of the groove 318 of the insulating member 311 that holds the terminal block 320 becomes a recess for receiving adhesive material. Figure 11 This illustrates the use of nozzle 501 to inject adhesive 500.

[0071] Figure 12 This is a third assembly diagram of the stator 300 of the rotary motor 100 according to Embodiment 1. After injecting adhesive into the bottom of the groove 318 of the insulating member 311, the assembly is performed by forming the terminal block 320 into a ring shape and inserting the fixing part 323 into the groove 318. Figure 12 The image shows the state before inserting the U-phase terminal block 320-U and the X-phase terminal block 320-X.

[0072] Figure 13 This is a second cross-sectional view of the insulating member 311 of the stator 300 of the rotary electric motor 100 according to Embodiment 1. It is a cross-sectional view cut along the face of the terminal block 320 to the insulating member 311 assembled to the coil 310. It shows the state of the groove portion 318 of the insulating member 311, the fixing portion 323 of the terminal block 320, and the adhesive liquid surface 500a at this time.

[0073] The adhesive 500 is cured while the fixing part 323 of the terminal block 320 is inside the injection area of ​​the adhesive 500. As a result, the fixing part 323 of the terminal block 320 is fixed by the adhesive 500 that has been cured in the recess at the bottom of the groove 318, so that the insulating member 311 is integrated with the terminal block 320.

[0074] <Coil Connection>

[0075] Figure 14 This is a perspective view showing the coil connection portion 321 of the terminal block 320 of the stator 300 of the rotary motor 100 according to Embodiment 1. It shows the state of the coil connection portion 321 of the terminal block 320 and the end wire 313 of the coil 310. The end wire 313, which is led out along the axial direction, is bent radially outward of the stator 300 and electrically connected to the coil connection portion 321 by processes such as soldering, brazing, or fusion welding.

[0076] <Terminal>

[0077] Figure 15 This is a perspective view of the terminal 340 of the stator 300 of the rotary motor 100 according to Embodiment 1. The terminal 340 is configured to be bent in such a way that its surface, which is the power supply side, extends along the axial direction (axial direction of the stator 300) of the cylindrical frame 211, extends toward the radial direction of the stator 300, which is the connecting portion connected to the terminal plate 320. In other words, the terminal 340 has a plate-like portion provided with a power supply side connecting portion 343 that protrudes outward in the radial direction from the opening 341 that connects with the terminal plate 320 and extends toward the other side in the axial direction.

[0078] A slit-shaped opening 341 is provided at the connection portion of the terminal 340 that connects to the terminal block 320. The power supply section 322 of the terminal block 320 is inserted into the opening 341 so that the opening 341 and the power supply section 322 are engaged.

[0079] In Embodiment 1, the power supply section 322 of the terminal block 320 is configured such that a pair of protrusions are arranged adjacent to each other. In the terminal block 340, a pair of openings 341 are provided in the shape of cuts from both ends in the width direction of the terminal block 340. A radial protrusion 342 is provided between the pair of openings 341, where the width of the terminal block 340 narrows. The radial protrusion 342 protrudes and extends radially along the stator 300.

[0080] The opening 341 extends circumferentially along the long side of the stator 300. Alternatively, the width between a pair of openings 341 of the terminal 340, i.e., the width of the radial protrusion 342, can be designed to be equal to or less than the spacing between a pair of protrusions of the power supply section 322 of the terminal block 320 (intermediate fit or tight fit). Furthermore, the width of the short side of each opening 341 can be designed to be equal to or less than the thickness (plate thickness) of the power supply section 322 (intermediate fit or tight fit). In this case, by inserting the power supply section 322 of the terminal block 320 into the opening 341 of the terminal 340, the power supply section 322 and the opening 341 are firmly fixed, eliminating the need for welding, bonding, and other processes to maintain a highly reliable electrical connection and thermal conductivity. This leads to a reduction in assembly costs and an improvement in electrical and thermal conductivity.

[0081] The plate-shaped flat portion of terminal 340 faces the opposite side of the stator 300 along its axial direction. Figure 15 (The lower side) protrudes. A power supply side connection part 343 is provided in the plate-shaped flat part, and current is supplied from the first control circuit 101 or the second control circuit 102.

[0082] Furthermore, metal sheet is often chosen as the material for terminal 340. This is because it performs excellently as a conductor for electrical connections. Additionally, terminal 340 functions to transfer heat generated by terminal block 320 and other components to heat dissipation parts. Furthermore, if the resistance of terminal 340 is high, the heat generated from terminal 340 itself will also increase. Based on the above, metal sheet is often chosen for terminal 340, and ideally, a metal material with high electrical and thermal conductivity is preferred.

[0083] Specifically, for terminal 340, ideally, it should be made of a high-purity material such as silver, copper, gold, aluminum, nickel, or platinum. However, considering cost, copper is used for terminal 340 here. Stainless steel could be used from both cost and strength perspectives, but the metals described above are more suitable in terms of electrical and thermal conductivity. When using stainless steel, it is ideal to use stainless steel that is at least copper-plated, i.e., stainless steel with copper-plated portions on its surface.

[0084] <Connection of terminals>

[0085] like Figure 2As shown, the terminals 340 are arranged in pairs at positions separated from each other relative to the annular frame 21. This allows heat generated in the terminal block 320, etc., and heat generated by the terminals 340 themselves, to be transferred to the heat dissipation section via the terminals 340. For this purpose, a pair of terminals 340 are connected to the heat dissipation section in a thermally conductive manner. More specifically, for example, it is desirable to have a structure in which a pair of terminals 340 are sandwiched in the frame 21 with a highly thermally conductive insulating member serving as the heat conduction path. Here, the frame 211 is part of the housing 210 that covers the outer periphery of the stator 300 of the rotary motor 100, and the heat from the terminal block 320 and terminals 340 is released to the housing 210.

[0086] Figure 16 This is a perspective view showing the connection between the terminal block 320 and the terminal 340 of the stator 300 of the rotary motor 100 according to Embodiment 1. The radial protrusion 342 of the terminal 340 is inserted into and fitted into a concave shape formed between a pair of protrusions provided on the terminal block 320. The fitted parts can also be electrically connected by processes such as soldering, brazing, or TIG (Tungsten Inert Gas) welding.

[0087] The terminal 340 is held in the terminal holding groove 319 provided in the substitute insulation member 311a, and heat is conducted to the frame 211 via the substitute insulation member 311a. The substitute insulation member 311a is an insulating member with high thermal conductivity. As a result, heat generated in the terminal block 320, etc., and heat generated from the terminal 340 itself, are dissipated to the frame 211 via the terminal 340. A structure in which the substitute insulation member 311a is tightly attached to the frame 211 by pressing the stator 300 into the frame 211 is sufficient. Alternatively, the substitute insulation member 311a can be fixed to the frame 211 by bonding or welding.

[0088] The terminal 340 is held in the terminal holding groove 319 provided in the replacement insulation member 311a. Since the terminal 340 is held in the replacement insulation member 311a, its position can be easily changed if desired. This is because only the positions of the insulation member 311 of the stator 300 without the terminal holding groove 319 and the replacement insulation member 311a with the terminal holding groove 319 need to be replaced. Furthermore, the position of the power supply section 322 of the terminal block 320 can be changed accordingly to the position of the terminal 340. Moreover, by maintaining the position of the terminal 340 while changing the position of the power supply section 322 of the terminal block 320, the terminal block 320 to which the terminal 340 is connected can be changed. Consequently, the group of coils 310 connected to the terminal 340 and the phase of the coils 310 can also be changed.

[0089] <Coil Configuration>

[0090] Figure 17 This is a first schematic diagram showing the connection between the terminal block 320 of the stator 300 and the coil 310 of the rotary motor 100 according to Embodiment 1. Figure 17 The configuration of the connection circuit, terminal block 320, and coil 310 is shown. Figure 18 It is shown that... Figure 17 A second schematic diagram showing different configurations. Figure 19 It is shown that... Figure 17 , Figure 18 A third diagram showing different configurations. Figure 20 This is a perspective view showing the arrangement of the terminal block 320 of the stator 300 of the rotary motor 100 of Embodiment 1, which is housed in the slot 318 of the insulating member 311.

[0091] In Embodiment 1, a structure is adopted in which the coils 310 of each three phase are connected in parallel via a first control circuit 101 and a second control circuit 102. Power is supplied from the two sets of control circuits arranged diagonally to a total of six terminals 340 of each three phase. In addition, power is distributed from the terminals 340 to the terminal block 320 and from the terminal block 320 to the coils 310.

[0092] exist Figure 17 , Figure 18 , Figure 19 In this system, the coil groups are divided into six groups, each consisting of three-phase coils 310. Specifically, in the coil group connected to the first control circuit 101, the coils of the first group are U1, V1, and W1; the coils of the second group are U2, V2, and W2; the coils of the third group are U3, V3, and W3; the coils of the fourth group are U4, V4, and W4; the coils of the fifth group are U5, V5, and W5; and the coils of the sixth group are U6, V6, and W6. In the coil group connected to the second control circuit 102, the coils of the first group are X1, Y1, and Z1; the coils of the second group are X2, Y2, and Z2; the coils of the third group are X3, Y3, and Z3; the coils of the fourth group are X4, Y4, and Z4; the coils of the fifth group are X5, Y5, and Z5; and the coils of the sixth group are X6, Y6, and Z6. In each phase, the windings of the same phase are wound separately on six pole teeth in the six coil groups of the first to sixth groups.

[0093] The windings 312 of the coils 310 in each of the first to sixth groups are connected to the same terminal block 320 for each phase and are driven simultaneously. The windings 312 of the U-layer coils 310 in the first group are connected to terminal block 320-U, the windings 312 of the V-layer coils 310 in the first group are connected to terminal block 320-V, and the windings 312 of the W-layer coils 310 in the first group are connected to terminal block 320-W. The windings 312 of the X-layer coils 310 in the second group are connected to terminal block 320-X, the windings 312 of the Y-layer coils 310 in the second group are connected to terminal block 320-Y, and the windings 312 of the Z-layer coils 310 in the second group are connected to terminal block 320-Z. By providing multiple groups of coils 310 in each group, the number of poles of the stator 300 is increased, thereby making the rotation of the rotary motor 100 stable and smooth. Furthermore, it improves the fault tolerance to faults such as broken wires in the windings 312 of the coils 310. Even under the above circumstances, the coils 310 of each phase can be configured for each group in a summary manner to shorten the length of the terminal block 320.

[0094] like Figure 20 As shown, in order to accommodate the terminal blocks 320 of each phase, three slots 318 are provided at different radial positions on the insulating member 311 and in place of the insulating member 311a. The three slots 318 respectively accommodate terminal blocks 320-U, 320-Y, 320-W or 320-X, 320-Y, 320-Z. Specifically, the slot 318 on the radially inner side accommodates terminal blocks 320-U and 320-X, the slot 318 on the radially central side accommodates terminal blocks 320-V and 320-Y, and the slot 318 on the radially outer side accommodates terminal blocks 320-W and 320-Z.

[0095] The coils 310 connected to each control circuit of the terminal block 320 connected to the two sets of control circuits are integrated for each set. Therefore, all the terminal blocks 320 can be housed in the same number of slots 318 as the number of phases (three phases) of each control circuit. As a result, it can be constructed without increasing the size of the stator 300 of Embodiment 1, thereby contributing to the miniaturization and weight reduction of the rotary motor 100.

[0096] exist Figure 17 , Figure 18 , Figure 19 In this configuration, coils 310 for each phase are arranged in a group, similar to coils U1, V1, and W1. However, it is also possible to configure coils 310 from different groups instead of using a group-wide arrangement. This is because wiring to coils 310 within the arc-shaped terminal block 320 is sufficient. A terminal block 320 is provided for each group, and to shorten the terminal block 320, only the arrangement of coils 310 for each group needs to be summarized.

[0097] When the number of control loop groups is set to N, the coils 310 of each group connected to each control loop are integrated and configured within a 360-degree / N angular region for each group. When the number of control loop groups is 2, they are configured within a 180-degree region. For example... Figure 17 As shown, by integrating the coils 310 of each group, the length of the terminal block 320 can be shortened compared to a structure in which the coils 310 of each group are discretely arranged.

[0098] Because the length of the terminal block 320 is shortened, the path for current supply is also shortened, reducing the heat generated by the terminal block 320 due to energization. Furthermore, the heat conduction path of the terminal block 320 is also shortened, thus promoting heat dissipation from the terminal block 320 to the frame 211 via the terminal 340. As the temperature of the terminal block 320 decreases, the temperature of the terminal 340 also decreases. Therefore, the heat generated by the terminal block 320 and the terminal 340 is reduced, enabling higher output from the rotary motor 100.

[0099] Furthermore, the length of the terminal block 320 can be shortened, and the current density can be reduced without increasing the cross-sectional area of ​​the terminal block 320 beyond what is necessary. This allows for a lighter terminal block 320 and reduces its material costs. Therefore, it contributes to the lightweighting and cost reduction of the rotary motor 100.

[0100] Can it be like Figure 18 The power supply terminal 340 is connected to the power supply section 322 of each terminal block 320, which is then positioned at the end of the terminal block 320. Alternatively, it can be... Figure 19 That would allow the two control circuits to be configured adjacent to each other. Even with such a configuration, the length of each terminal block 320 can be shortened, thereby reducing the heat generated by the terminal block 320 and the terminal 340, thus enabling the rotary motor 100 to achieve high output.

[0101] Preferably, such as Figure 17 The power supply section 322 of each terminal block 320 is connected to the terminal block 340 at the center of its arc length. This is because by evenly distributing the current flowing from the power supply section 322 to each coil 310 within the terminal block 320, heat generation due to localized increases in current density is prevented. The term "center" here is not strictly accurate; approximate centrality is sufficient. This is because any improvement over the situation where the power supply section 322 is located at the end of the terminal block 320 is acceptable.

[0102] By setting the number of coil connection portions 321 arranged on both sides of the power supply section 322 to be the same or differing by 1, the magnitude of the current distributed on both sides of the terminal block 320 can be made uniform, corresponding to whether the number of coil connection portions 321 connected to the terminal block 320 is even or odd.

[0103] 2. Implementation Method 2

[0104] Figure 21 This is a cross-sectional view showing the installation of the terminal 340 of the stator 300a of the rotary motor 100a in Embodiment 2, showing a section cut along the shaft 401 of the rotary motor 100a (the rotary motor 100a is not shown). The structure that uses a terminal block 350 instead of an insulating member 311a to hold the terminal 340 differs from that in Embodiment 1.

[0105] The terminal block 350 is fixed to the frame 211 using methods such as adhesive, bolt fastening, and fitting. This eliminates the need for a replacement insulating component 311a with a terminal holding groove 319. Furthermore, the insulating component can be standardized into a single type, 311. This reduces the number of component types, lowers manufacturing and management costs, and consequently contributes to cost reduction for the rotary motor 100. Moreover, the placement of the replacement insulating component 311a does not need to be considered when changing the placement of the terminal block 340. Since changes in the placement of the terminal 34 can be accommodated simply by altering the position or shape of the terminal block 320 and the mounting position of the terminal block 350 to the frame 211, design flexibility is increased, and the increase in man-hours due to changes in the number of steps can be reduced.

[0106] By forming the terminal block 350 with a highly thermally conductive insulating material and ensuring sufficient contact area with the terminal block 340 and the frame 211, the heat generation of the terminal block 320 and the terminal 340 can be reduced, thereby enabling high output of the rotary motor 100a. Here, the frame is part of the housing 210 that covers the outer periphery of the stator 300a of the rotary motor 100a, and the heat from the terminal block 320 and the terminal 340 is dissipated to the housing 210.

[0107] 3. Implementation Method 3

[0108] Figure 22This is a cross-sectional view showing the installation of the terminal 340 of the stator 300b of the rotary motor 100b in Embodiment 3, showing a section cut along the shaft 401 of the rotary motor 100a (rotary motor 100b is not shown). In Embodiment 2, a terminal block 350 for fixing the terminal 340 is provided on the frame 211, but in Embodiment 3, a terminal block 350a for fixing the terminal 340 is provided on the sleeve 213. The terminal block 350a is fixed to the sleeve 213 by methods such as adhesive, bolt fastening, or fitting. The terminal 340 is connected to the sleeve 213 via the terminal block 350a. Heat from the terminal 340 can be transferred to the sleeve 213, thereby improving heat dissipation.

[0109] A refrigerant flow path 215 is provided in the cylindrical portion of the frame 211. A sleeve 213 is provided on the outer periphery of the cylindrical portion of the frame 211, and the portion enclosed by the frame 211 and the sleeve 213 constitutes the refrigerant flow path 215. The refrigerant flow path 215 provides a cooling medium for flow and can suppress the temperature rise of the rotary motor 100b.

[0110] exist Figure 22 The diagram shows an example where the sleeve 213 is a separate component from the frame 211. The sleeve 213 can be welded and assembled to the frame 211. Alternatively, the sleeve 213 can be formed integrally with the frame 211 by casting, forging, or the like. Both the frame 211 and the sleeve 213 are part of the housing 210 that covers the outer periphery of the stator 300b of the rotary motor 100b.

[0111] Heat transferred from terminal 340 is transferred via terminal block 350a to sleeve 213 in housing 210, which functions as a heat dissipation component. Inside housing 210, refrigerant flows in a flow path formed by sleeve 213 and frame 211. Heat guided to housing 210 is transferred via refrigerant, thereby efficiently dissipating heat. This further improves the heat dissipation performance of terminal 340 or terminal block 320.

[0112] This application describes various exemplary embodiments and examples, but the various features, methods, and functions described in one or more embodiments are not limited to specific embodiments and can be applied to embodiments individually or in various combinations. Therefore, numerous modifications not illustrated are contemplated within the scope of the technology disclosed in this application. For example, these include modifications, additions, or omissions of at least one constituent element, as well as cases where at least one constituent element is extracted and combined with constituent elements of other embodiments.

Claims

1. A rotary electric motor, characterized in that, It has a stator, said stator comprising: The coil section is composed of multiple sets of multiphase windings arranged in a circular shape. A cylindrical outer shell that surrounds the coil portion; Multiple arc-shaped terminal blocks are disposed on one side of the axial direction of the coil section, corresponding to each phase of the winding in each group, and connected to the winding; and Multiple terminals are provided, each of which is connected to the terminal block and disposed in the housing via an insulating element. A portion of the insulating element is replaced by an alternative insulating element having a terminal retaining groove for retaining the terminal. The number of replacement insulating components corresponds to the number of groups. The terminals corresponding to each of the plurality of groups and the alternative insulating members that hold the terminals are arranged separately from each other in the circumferential direction. The rotary motor includes a first control circuit and a second control circuit, which are two sets of control circuits. The winding is connected to the first control circuit or the second control circuit via the terminal. The windings are supplied with power in parallel from the first control circuit and the second control circuit, corresponding to the three-phase AC drive. The windings are configured circumferentially for each group.

2. The rotary motor as described in claim 1, characterized in that, In each region of the angle obtained by dividing 360 degrees by the number of groups, the windings are configured in a group.

3. The rotary motor as described in claim 1 or 2, characterized in that, The terminal block is connected to the terminal at the center of the arc length direction.

4. The rotary motor as described in claim 1 or 2, characterized in that, The insulating component secures multiple terminal blocks in a concentric circle to the coil portion.

5. The rotary motor as described in claim 4, characterized in that, The insulating component has a groove for fixing the terminal block.

6. The rotary electric motor as described in claim 1 or 2, characterized in that, The terminal is fixed by a terminal retaining groove provided in the replacement insulating element.

7. The rotary electric motor as described in claim 1 or 2, characterized in that, The housing includes a terminal block for securing the wiring terminals.

8. The rotary electric motor as described in claim 1 or 2, characterized in that, The outer casing has a refrigerant flow path inside.

9. The rotary electric motor as described in claim 1 or 2, characterized in that, Each phase of each group has its windings separately wound onto multiple pole teeth.

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