Rotary motor

Abstract

This invention provides a rotary electric motor comprising: a stator housed within a housing, from which power lines extend; and a temperature sensing element disposed on the stator. The rotary electric motor includes a wiring harness limiting portion that guides the wiring harness extending from the temperature sensing element toward the inner peripheral wall of the housing. The rotary electric motor of this invention can suppress interference between the wiring harness within the housing and the power lines.

Description

Technical Field

[0001] This invention relates to rotary electric motors. Background Technology

[0002] A rotary electric machine is known in which a temperature sensing element is provided in the stator windings of the stator (see, for example, Japanese Patent Application Laid-Open No. 2016-19349). The stator is housed within a housing, and a wire harness extending from the temperature sensing element is led out from the inside of the housing to the outside and connected to the control device of the rotary electric machine. Furthermore, a power line led out from the stator windings is connected to an inverter located outside the housing. A terminal plate exists between the power line and the inverter, and a terminal portion of the power line at its front end is connected to the terminal plate. The terminal portion is mounted to the front end of the power line by welding, forming a welded portion between the front end of the power line and the terminal portion. This welded portion is also disposed within the housing along with the stator. Summary of the Invention

[0003] However, recent advancements in the miniaturization of rotary electric machines have led to a reduction in the internal space of the housing. As a result, interference sometimes occurs between the wiring harness extending from the temperature sensing element and the power line. When this interference occurs, the connection between the power line terminal and the terminal block may become loose, or the solder joint between the front end of the power line and the terminal may be damaged.

[0004] The rotary electric motor disclosed in this specification is provided to suppress interference between the wiring harness and the power lines within the housing of the rotary electric motor.

[0005] The rotary electric motor disclosed in this specification includes: a stator housed within a housing and from which power lines are led out; a temperature sensing element disposed on the stator; and a wiring harness limiting portion configured to guide the wiring harness extending from the temperature sensing element toward the inner peripheral wall of the housing.

[0006] In the aforementioned rotary motor, the wiring harness limiting part can also be provided on a terminal plate, which is provided on the housing, and the power line led out from the stator can also be connected to the terminal plate.

[0007] In addition, in the aforementioned rotary motor, the wiring harness limiting part may also have a plate shape that extends from the terminal plate toward the inside of the housing.

[0008] Furthermore, in the aforementioned rotary motor, when the direction extending along the axis of the stator is taken as the width direction, the wire harness limiting portion may also have an inclined portion in which the width of the plate shape narrows as it moves toward the front end.

[0009] Furthermore, in the aforementioned rotary motor, the wiring harness limiting portion may also have a wiring harness holding portion on the surface opposite to the inner peripheral wall of the housing. The wiring harness holding portion may also be configured to allow the wiring harness to enter.

[0010] The rotary electric motor disclosed in this specification can suppress interference between the wiring harness and the power line within the housing of the rotary electric motor. Attached Figure Description

[0011] The features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, wherein like reference numerals denote like parts, and wherein:

[0012] Figure 1 This is an explanatory diagram showing a terminal block of a rotary motor in an embodiment, which is provided with a wire harness limiting section and is installed thereon.

[0013] Figure 2 This is a perspective view showing the schematic structure of the stator of the rotary electric machine according to the embodiment.

[0014] Figure 3 This is an explanatory diagram showing an example of the three-phase wiring of the stator of a rotary electric machine formed in the embodiment.

[0015] Figure 4 yes Figure 2 An enlarged view of section X1 shown.

[0016] Figure 5 This is a front view of the terminal block of the rotary motor installed in the embodiment.

[0017] Figure 6 This is a left-side view of the terminal block of the rotary motor installed in the embodiment.

[0018] Figure 7A This is a right-side view of the terminal block of the rotary electric machine installed in the embodiment. Figure 7B This is a side view of the wire harness limiting section.

[0019] Figure 8 This is a rear view of the terminal block of the rotary electric motor installed in the embodiment.

[0020] Figure 9 This is an explanatory diagram showing the state obtained by viewing the portion of the rotary motor in the embodiment where the terminal plate is installed from the inside of the housing.

[0021] Figure 10 This is an explanatory diagram illustrating the positional relationship between the wiring harness and the wiring harness limiting part when viewed from above a rotating motor.

[0022] Figure 11AThis is an explanatory diagram illustrating the positional relationship between the wire harness and the wire harness limiting part when viewed from the inner circumferential surface of the housing. Figure 11B This is an explanatory diagram illustrating the positional relationship between the wire harness and the wire harness restriction section when viewed from the front end. Detailed Implementation

[0023] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, in the drawings, the dimensions, proportions, etc. of each part are sometimes not shown in a manner that is completely consistent with the actual dimensions, proportions, etc. In addition, details are sometimes omitted in the description based on the accompanying drawings.

[0024] Implementation

[0025] Structure of a rotating electric machine

[0026] First, refer to Figure 1 and Figure 2 The structure of the rotary motor 100 according to the embodiment will be described. Figure 1 This is an explanatory diagram of the terminal plate 50 installed on the rotary motor 100 in the embodiment. Figure 2 This is a perspective view showing the schematic structure of the stator 10 of the rotary electric machine 100. In the following description, as... Figure 2 As shown, the direction in which the axis AX of the stator 10 extends is described as the vertical direction. The rotary motor 100 is mounted on a vehicle (automobile) and used as a power source for the vehicle.

[0027] Reference Figure 1 The terminal block 50 includes a first connection portion 52. The first connection portion 52 includes a first U-phase connection portion 52a, a first V-phase connection portion 52b, and a first W-phase terminal portion 52c. (See reference...) Figure 2 The rotary motor 100 includes a stator 10 and a rotor 15 disposed inside the stator 10. The rotation axis of the rotor 15 coincides with the axis AX of the stator 10. A temperature sensor unit 30 for detecting the temperature of the stator 10 is mounted on the stator 10. The stator 10 is housed within a housing 40. A terminal plate 50 is mounted on the housing 40 (see reference). Figure 9 The first U-phase connection section 52a is connected to the U-phase terminal section 26, the first V-phase connection section 52b is connected to the V-phase terminal section 27, and the first W-phase terminal section 52c is connected to the W-phase terminal section 28. Their connection relationships will be explained in detail later.

[0028] Stator Structure

[0029] Next, refer to Figures 2-4 The stator 10 will be described. Figure 2 Only the stator 10, a portion of the housing 40, and the temperature sensor unit 30 are described; the rotor 15 is omitted. (Refer to...) Figure 2At this time, the stator 10 includes a stator core 20. The stator core 20 is formed by stacking electromagnetic steel sheets after stamping them into a predetermined shape. The stator core 20 is formed into a cylindrical shape concentric with the rotation axis of the rotor 15. Bolt holes 21a and 21b are provided on the outer peripheral surface of the stator core 20, which are used for connecting to the mounting object of the rotary motor 100. The rotary motor 100 is a three-phase AC motor that uses a star connection structure as its wiring structure. When a part of the circuit diagram of the rotary motor 100 is shown, as shown... Figure 3 As shown, a U-phase winding 22, a V-phase winding 23, and a W-phase winding 24 configured in a star (Y) configuration are depicted. A thermistor 31, serving as a temperature sensing element, is installed at the neutral point 29 connecting the U-phase winding 22, the V-phase winding 23, and the W-phase winding 24.

[0030] Figure 3 This is a part of the circuit diagram of a three-phase AC motor, but the actual U-phase winding 22, V-phase winding 23, and W-phase winding 24 are formed by combining a large number of U-shaped segmented windings (not shown). The U-shaped segments are insulated with conductors such as copper and are inserted into slots (not shown) located on the inner circumferential surface of the stator core 20.

[0031] When reference Figure 2 At this time, the upper winding end portion 25a protrudes to the upper end side of the stator core 20 along the AX direction. The upper winding end portion 25a is formed by extending the U-phase winding 22, V-phase winding 23, and W-phase winding 24 from the upper end face of the stator core 20. The lower winding end portion 25b protrudes to the lower end side of the stator core 20 along the AX direction. The lower winding end portion 25b is formed by extending the U-phase winding 22, V-phase winding 23, and W-phase winding 24 from the lower end face of the stator core 20.

[0032] like Figure 2 , Figure 4 As shown, the U-phase power line 22a, V-phase power line 23a, and W-phase power line 24a are led out from the lower winding end portion 25b. A U-phase terminal portion 26 is provided at the end of the U-phase power line 22a. A V-phase terminal portion 27 is provided at the end of the V-phase power line 23a. A W-phase terminal portion 28 is provided at the end of the W-phase power line 24a.

[0033] The U-phase terminal 26 is provided by welding a component with an annular portion to the front end of the U-phase power line 22a, so that it can be bolted to the first U-phase connection portion 52a of the terminal plate 50, which will be described in more detail later (see reference). Figure 1 , Figure 5(etc.). Therefore, a U-phase welding portion 26a is formed between the U-phase terminal portion 26 and the U-phase power line 22a. Similarly, a V-phase welding portion 27a is formed between the V-phase terminal portion 27 and the V-phase power line 23a, and a W-phase welding portion 28a is formed between the W-phase terminal portion 28 and the W-phase power line 24a.

[0034] The U-phase power line 22a, V-phase power line 23a, and W-phase power line 24a are connected via terminal block 50 to the respective power supply (not shown) of the converter located outside the housing 40. The U-phase winding 22, V-phase winding 23, and W-phase winding 24 cooperate to generate a rotating magnetic field.

[0035] Temperature sensor unit

[0036] Reference Figure 2 and Figure 4 The temperature sensor unit 30 includes a thermistor 31, a first wiring harness 32, and a second wiring harness 33. The temperature sensor unit 30 detects the temperature of the stator 10 and sends the acquired temperature data to a control device (not shown) disposed outside the housing 40. In the rotary motor 100, when current flows in the U-phase winding 22, V-phase winding 23, and W-phase winding 24, each winding heats up, and the temperature of the stator 10 rises. When the temperature of the stator 10 rises above a predetermined value, some components constituting the stator 10 may be damaged due to heat. Therefore, the temperature sensor unit 30 sends the detected temperature data to the control device, and the control device cuts off the current supplied to each winding to prevent the temperature of the stator 10 from rising further.

[0037] One end of the first wire harness 32 is connected to the thermistor 31, and a first connector 32a is provided at the other end of the first wire harness 32. One end of the second wire harness 33 is provided with a second connector 33a, and the other end of the second wire harness 33 is provided with a connection portion 54a (see reference) for connection to the inner wire harness provided on the terminal board 50. Figure 5 (The connection is not shown.)

[0038] like Figure 3 As shown, the thermistor 31 is installed at the neutral point 29 connecting the U-phase winding 22, the V-phase winding 23, and the W-phase winding 24, but as... Figure 2 , Figure 4 As shown, the actual installation position in the stator 10 is the bottom surface of the lower end winding end portion 25b. The thermistor 31, in order to detect the temperature of the stator 10 as inconspicuously as possible by the ambient temperature, is coated with resin and adhered to the lower end winding end portion 25b by the resin.

[0039] The first wire harness 32 and the second wire harness 33 are connected by fitting the first connector 32a and the second connector 33a. A boss 41a extending in the vertical direction is provided on the inner peripheral wall 41 of the housing 40, and a wire harness bracket 42 is installed on the boss 41a.

[0040] The wire harness bracket 42 has a flat mounting portion 42a, a cover portion 42b connected to one end of the mounting portion 42a, and an insertion portion 42c connected to the other end of the mounting portion 42a. The mounting portion 42a is mounted on the upper end of the boss portion 41a and is fixed to the boss portion 41a by bolts 43. The cover portion 42b has two wall portions extending in the vertical direction, which together with the inner peripheral wall surface 41 of the housing 40 form a space communicating in the vertical direction. The first wire harness 32 is routed through this space. The insertion portion 42c is configured to extend upward from the other end of the mounting portion 42a and be inserted into an insertion hole (not shown) provided in the second connector 33a. Thus, the second connector 33a, which is fitted with the first connector 32a, is fixed to the wire harness bracket 42. And, as Figure 2 , Figure 9 As shown, most of the second wire harness 33 is located on the underside of the mounting portion 42a.

[0041] Furthermore, the second harness 33 is constrained by the harness limiting part 55 (see below) as detailed in the following description. Figure 1 , Figure 10 )Guided towards the inner peripheral wall 41 side, but Figure 2 , Figure 4 In this diagram, the stator 10 is not connected to the terminal block 50. The terminal block 50 is also omitted in the attached diagram. Therefore, the second wiring harness 33 is positioned to be able to approach the power lines (especially the U-phase power line 22a). That is, the second wiring harness 33 is positioned to potentially interfere with the power lines.

[0042] Terminal board

[0043] Next, refer to Figure 1 , Figures 5 to 11B The terminal block 50 will be described. The terminal block 50 can be attached to and detached from the housing 40. First, refer to... Figures 5-8 The structure of the terminal block 50 and its installation state in the housing 40 will be described. Figure 5 This is a front view of the terminal block 50. The terminal block 50 is mounted to the housing 40 such that the surface shown in this front view is located inside the housing 40. Figure 6 This is a left-side view of terminal block 50. Terminal block 50 is... Figure 6 The right side of the housing 40 is located inside the housing. Figure 6 The left side of the housing 40 is mounted on the outer side of the housing 40. Figure 7AThis is a right-side view of terminal block 50. Terminal block 50 is... Figure 7A The left side is located inside the housing 40. Figure 7A The right side of the housing 40 is mounted on the outside of the housing 40. Figure 8 This is a rear view of the terminal block 50. The terminal block 50 is mounted to the housing 40 such that the surface shown in this rear view is located outside the housing 40. Furthermore, the housing 40 itself does not have a special structure for guiding the wire harness, and a housing of existing specifications can be used directly. Therefore, providing the wire harness limiting part 55 in the terminal block 50 is also advantageous in terms of the overall cost of the rotary motor 100.

[0044] The terminal plate 50 includes a main body 51, a first connecting part 52, and a second connecting part 53. Bolt holes 51a are provided at the four corners of the main body 51. The terminal plate 50 is bolted to the housing 40 by bolts (not shown) inserted into the bolt holes 51a.

[0045] The first connecting portion 52 is located inside the housing 40 when the terminal plate 50 is mounted on the housing 40. The first connecting portion 52 includes a first U-phase connecting portion 52a, a first V-phase connecting portion 52b, and a first W-phase connecting portion 52c. The U-phase terminal portion 26 is connected to the first U-phase connecting portion 52a by a bolt (not shown), the V-phase terminal portion 27 is connected to the first V-phase connecting portion 52b by a bolt (not shown), and the W-phase terminal portion 28 is connected to the first W-phase terminal portion 52c by a bolt (not shown).

[0046] The second connection portion 53 is located on the outside of the housing 40 when the terminal plate 50 is mounted on the housing 40. The second connection portion 53 includes a second U-phase connection portion 53a, a second V-phase connection portion 53b, and a second W-phase connection portion 53c. The second U-phase connection portion 53a is located opposite to the first U-phase connection portion 52a and is connected to a cable disposed between the second U-phase connection portion 53a and the U-phase power supply of a converter (not shown). The second V-phase connection portion 53b is located opposite to the first V-phase connection portion 52b and is connected to a cable disposed between the second V-phase connection portion 53b and the V-phase power supply of a converter (not shown). The second W-phase connection portion 53c is located opposite to the first W-phase connection portion 52c and is connected to a cable disposed between the second W-phase connection portion 53c and the W-phase power supply of a converter (not shown).

[0047] With the terminal block 50 mounted on the housing 40, the terminal block 50 has an inner wire harness connection portion 54a located inside the housing 40 (see reference). Figure 5 The second wire harness 33 is connected to the inner wire harness connection part 54a (see reference). Figure 2 , Figure 4 The connecting part (not shown).

[0048] With the terminal block 50 mounted on the housing 40, the terminal block 50 has an outer wire harness connection portion 54b located on the outer side of the housing 40 (see reference). Figure 8 The outer wire harness connection portion 54b is located on the opposite side of the inner wire harness connection portion 54a. A wire harness (not shown) is connected to the outer wire harness connection portion 54b between the outer wire harness connection portion 54b and a control device (not shown) disposed outside the housing 40.

[0049] like Figure 7A and Figure 7B As shown, the terminal block 50 includes a wire harness limiting portion 55. The wire harness limiting portion 55 guides the second wire harness 33 towards the inner peripheral wall surface 41. The wire harness limiting portion 55 is configured such that when the terminal block 50 is mounted on the housing 40 (see reference...) Figure 9 The plate-shaped portion 55a is configured to extend from the terminal plate 50 toward the inner side of the housing 40. Here, the length, width, and thickness directions of the plate-shaped portion 55a are as follows: Figure 1 , Figure 5 as well as Figure 6 The configuration is described as shown. The width direction extends in the same direction as the axis AX of the stator 10. The plate-shaped portion 55a is configured such that the surface defined by its width and length directions faces the inner peripheral wall surface 41 of the housing 40.

[0050] When reference Figure 4 At this time, the U-phase terminal portion 26 is positioned closest to the inner peripheral wall surface 41. Therefore, the first U-phase connection portion 52a, which connects to the U-phase terminal portion 26 in the connection portion of each phase, provided on the terminal plate 50, is positioned closest to the inner peripheral wall surface 41. For this reason, in this embodiment, a plate-shaped portion 55a is provided near the first U-phase connection portion 52a. By having a plate-shaped portion 55a with a width, the harness limiting portion 55 can limit the range of the second harness 33 to a certain extent, thus reliably guiding the second harness 33 toward the inner peripheral wall surface 41. In addition, the length of the plate-shaped portion 55a (the amount of protrusion into the housing 40) is also set to a value that prevents the second harness 33 from falling off between the inner peripheral wall surface 41 and the harness limiting portion 55.

[0051] When reference Figure 5 Figure 7 Figure 11A as well as Figure 11B At that time, three ribs extending along the length direction are provided on the surface of the plate-shaped portion 55a opposite to the inner peripheral wall surface 41, specifically the first rib 56a, the second rib 56b, and the third rib 56c. Figure 7AAs shown, the first rib 56a, the second rib 56b, and the third rib 56c extend along the length direction, but their respective front ends do not reach the front end 55a1 of the plate-like portion 55a. Therefore, on the side of the plate-like portion 55a opposite to the inner peripheral wall surface 41... Figure 10 , Figure 11A As shown, a wire harness holding section 57 is formed to allow the second wire harness 33 to enter. (Refer to...) Figure 5 At this time, the thickness of the plate-shaped portion 55a, including the positions where the first rib 56a, the second rib 56b, and the third rib 56c are provided, is t1. In contrast, the thickness of the wire harness holding portion 57, which is not reached by any rib, is t2, which is thinner than the thickness t1. That is, the wire harness holding portion 57 is recessed towards the side away from the inner peripheral wall surface 41 by the difference between the thickness t1 and the thickness t2. The second wire harness 33 enters such a wire harness holding portion 57 and is held in a stable state.

[0052] When reference Figure 6 , Figure 7A as well as Figure 7B In this embodiment, an inclined portion 58 is provided at the front end 55a1 of the plate-shaped portion 55a that forms the wire harness limiting portion 55, such that the width of the plate shape narrows as it moves towards the front end. The width at the base end of the plate-shaped portion 55a is w1, while the width at the front end 55a1 is w2, which is narrower than the width w1. In this embodiment, the inclined portion 58 is provided at the upper edge of the plate-shaped portion 55a. By providing such an inclined portion 58, the force applied to the second wire harness 33 when it contacts the upper edge of the plate-shaped portion 55a, which extends approximately in the vertical direction, can be mitigated, thus suppressing damage and wear to the second wire harness 33. Furthermore, although the inclined portion 58 is provided at the upper edge of the plate-shaped portion 55a in this embodiment, the same inclined portion can also be provided at the lower edge of the plate-shaped portion 55a.

[0053] Next, refer to Figures 9 to 11B The function of the harness limiting part 55 will be explained. (Refer to...) Figure 9 , Figure 10 At that time, the second wire harness 33 is guided toward the inner peripheral wall surface 41 of the housing 40 by utilizing the wire harness limiting part 55 provided on the terminal plate 50 installed on the housing 40. That is, as Figure 10 As shown, the second wiring harness 33 is located between the inner peripheral wall surface 41 and the wiring harness limiting part 55. This prevents the second wiring harness 33 from being pushed towards the center of the housing 40. Consequently, by separating the second wiring harness 33 from the U-phase power line 22a, interference between the two can be avoided. Because the wiring harness limiting part 55 is provided, the second wiring harness 33 is routed along the inner peripheral wall surface 41; therefore, the effect of avoiding interference is also significant in propulsion of the miniaturized rotary motor 100.

[0054] Thus, when interference between the second harness 33 and the U-phase power line 22a is avoided, the U-phase weld 26a, which joins the U-phase power line 22a to the U-phase terminal 26, will not be subjected to forces caused by interference. Furthermore, damage to the U-phase weld 26a and loosening of the bolts (not shown) used to secure the U-phase terminal 26 can be avoided. In this way, the harness limiting part 55 eliminates interference between the second harness 33 and the U-phase power line 22a. Furthermore, the harness limiting part 55 also prevents interference between the V-phase power line 23a and the W-phase power line 24a, which are located closer to the housing 40 than the U-phase power line 22a, and the second harness 33. As a result, damage to any welded joints and loosening of bolts can be avoided.

[0055] Effect

[0056] The rotary motor 100 of this embodiment includes a wire harness limiting portion 55 that guides the wire harness (second wire harness 33) extending from the thermistor 31 toward the inner peripheral wall surface 41 of the housing 40. This prevents interference between the second wire harness 33 and the windings (U-phase winding 22, V-phase winding 23, W-phase winding 24) extending from the stator 10. Consequently, damage to the welded portions between the windings and terminals, and loosening of the terminals, can be suppressed.

[0057] A wiring harness limiting part 55 is provided on a terminal plate 50, which is disposed on the housing 40. As a result, there is no need to change the design of the housing itself, which is advantageous in terms of cost.

[0058] The wire harness limiting part 55, by having a plate shape, can limit the range of the second wire harness 33 to a certain extent, and can reliably guide the second wire harness 33 toward the inner peripheral wall surface 41.

[0059] The wire harness limiting part 55, by having an inclined part 58 at its front end, can suppress the friction and damage of the second wire harness 33 itself.

[0060] The harness limiting part 55 has a harness holding part 57 on the surface opposite to the inner peripheral wall surface 41 of the housing 40, which allows the second harness 33 to enter, thus enabling the second harness 33 to be stably held.

[0061] Variations

[0062] In this embodiment, the harness limiting portion 55 restricts the range of the second harness 33 to a certain extent by having a plate-like portion 55a with a width. In contrast, the harness limiting portion may also be provided as having a plurality of rod-like portions arranged parallel in the vertical direction, through which the second harness 33 is guided toward the inner peripheral wall surface 41.

[0063] Alternatively, in the case of reconfiguring the housing, it can be set such that a portion of the wire harness is pre-installed on the inner peripheral wall of the housing to guide the wire harness towards the inner peripheral wall side.

[0064] The above-described embodiments are merely examples for implementing the present invention. The present invention is not limited to these embodiments, and various modifications to these embodiments are within the scope of the present invention. Furthermore, it is obvious from the above description that various other embodiments can be implemented within the scope of the present invention.

Claims

1. A rotary electric motor, wherein a temperature sensing element is disposed on the stator, the stator being housed within a housing and having power lines extending from it, the rotary electric motor being characterized in that it comprises: The first wiring harness extends from the temperature sensing element and has the first connector; The second wiring harness has a second connector, which is engaged with the first connector to connect to the first wiring harness; A wire harness bracket is disposed inside the housing, forming a space between itself and the inner peripheral wall of the housing, and allowing the first wire harness to pass through the space; A terminal block, disposed in the housing, connects to the power line led out from the stator; as well as A wire harness limiting part is provided on the terminal plate and configured to guide the second wire harness toward the inner peripheral wall surface of the housing.

2. The rotary motor according to claim 1, characterized in that, The wiring harness limiting portion has a plate shape extending from the terminal plate toward the inside of the housing.

3. The rotary motor according to claim 2, characterized in that, The wiring harness limiting portion has an inclined portion that narrows the width of the plate shape as it moves toward the front end when the direction extending along the axis of the stator is taken as the width direction.

4. The rotary electric motor according to any one of claims 1 to 3, characterized in that, The harness limiting part includes a harness holding part, which is located on the surface opposite to the inner peripheral wall of the housing, for the second harness to enter.

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