JP2019201457A - Rotary electric machine and assembly method of rotary electric machine - Google Patents

Abstract

To provide a rotary electric machine in which stator oscillatory displacement can be reduced, and an assembly method of the rotary electric machine.SOLUTION: A stator 120 includes a first stator core laminate body 121 formed by laminating a plurality of steel sheets having the same shape, and a second stator core laminate body 122 formed by a laminating a plurality of steel sheets having the same shape. The first stator core laminate body 121 and the second stator core laminate body 122 are formed by combining stator cores having the same shape so as to be in point symmetry. Both the bodies are integrated to form a both-side supporting structure.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotating electrical machine and a method for assembling the rotating electrical machine.

  A drive device for a vehicle such as a hybrid vehicle has a motor / generator (rotary electric machine) arranged in parallel, and each motor / generator has a rotation shaft, and the rotation shafts are arranged so as to overlap each other coaxially. . The motor includes a non-rotating side stator and a rotating side rotor.

  In Patent Document 1, a stator core including an annular yoke and a plurality of teeth protruding radially inward from an inner peripheral surface of the yoke, a coil wound around the teeth, and a part of the coil , Provided between the radially outer side of the coil end portion that protrudes axially outward from the axial end surface of the teeth and the outer periphery of the yoke, so as to form a magnetic path between one tooth and another tooth. And a magnetic body extending in the circumferential direction.

FIG. 6 is a side cross-sectional view of the motor 1 described in Patent Document 1. As shown in FIG.
The motor 1 is a thin motor mounted on a hybrid vehicle (vehicle), for example.
As shown in FIG. 6, the motor 1 includes a rotor 11 and an annular stator 12 disposed on the radially outer side of the rotor 11. The rotor 11 and the stator 12 face each other in the radial direction, and a slight gap (air gap G) is provided in the radial direction.
The rotor 11 has a rotor core 16 and an end face plate 17 that prevents the rotor core 16 from being displaced in the direction of one end of a rotating shaft (not shown).

The stator 12 includes a stator core 13 in which a plurality of divided cores are annularly arranged, and a coil 14 wound around the stator core 13.
The stator core 13 is held by a cylindrical stator holder 15. A through hole 12 b that penetrates the stator core 13 in the radial direction is formed in the outer peripheral portion 12 a of the stator core 13. The stator 12 is attached to the housing 18 by passing the shaft portion of the mounting bolt B through the through hole 12 b and screwing it into a bolt insertion hole (not shown) formed in the housing 18.
As shown in FIG. 6, the shaft 12 of the mounting bolt B is fastened in the front-rear direction by a bolt insertion hole (not shown) of the stator 12 and the housing 18, thereby fixing the stator 12 to the housing 18. The stator core 13 has a cantilever structure in which the outer peripheral portion 12a of the stator core 13 is supported by the mounting bolt B.

JP 2017-139873 A

However, since the stator described in Patent Document 1 has a cantilever structure in which the outer peripheral portion 12a of the stator core 13 is supported, there is a problem that the amount of physical deflection is larger than that of the both-side support structure. In addition, the cantilevered stator core 13 has the following stator vibration modes, and motor noise, carrier noise, and the like become a problem at the resonance part.
7 and 8 are diagrams showing typical stator vibration modes. As shown in FIG. 7, the cantilevered stator core 13 is composed of an annular secondary (see FIG. 7A), an annular tertiary (see FIG. 7B), an annular quaternary (FIG. 7C). (Refer to FIG. 7 (d)) and circular 0th order (refer to FIG. 7 (e)). As shown in FIG. 8, the cantilevered stator core 13 includes an annular secondary + bend (see FIG. 8A), an annular tertiary + bend (see FIG. 8B), and an open bend (FIG. 8). (See (c)).
The stator core 13 having a cantilever structure has the above-described stator vibration mode, and a motor sound, a carrier sound, or the like becomes a problem at a resonance portion in the vibration mode.

  The present invention has been made in view of such a background, and an object thereof is to provide a rotating electrical machine and a method of assembling the rotating electrical machine that can reduce stator vibration displacement.

  In order to solve the above-mentioned problem, the rotating electrical machine according to claim 1 is a rotating electrical machine that houses a stator core formed by laminating a plurality of steel plates, a rotor, and a rotating shaft in a case. A first stator core laminate having a mounting portion and a plurality of steel plates of the same shape laminated, and a second stator core laminate having a mounting portion and a plurality of steel plates having a shape corresponding to the steel plates of the first stator core laminate. The first stator core laminate is fixed to the case on one side in the axial direction and the second stator core laminate is fixed on the other side in the axial direction.

  ADVANTAGE OF THE INVENTION According to this invention, the assembly method of the rotary electric machine and rotary electric machine which can reduce a stator vibration displacement can be provided.

It is a sectional side view of the rotary electric machine which concerns on one Embodiment of this invention. FIG. 2 is a perspective view of the stator core laminate. It is a perspective view of the stator core laminated body of the rotary electric machine which concerns on the said embodiment. It is a figure which shows the structure of the electromagnetic steel plate of the stator core laminated body of the rotary electric machine which concerns on the said embodiment, (a) is the top view, (b) is an enlarged view of the part enclosed with the dashed-dotted line (a). It is a perspective view which shows the laminated structure of the electromagnetic steel plate which has the notch part for refrigerant | coolant supply of the stator core of the rotary electric machine which concerns on the said embodiment, (a) is a perspective view which shows three notch parts for refrigerant | coolant supply opened in a different position. FIGS. 4B to 4D are perspective views showing respective refrigerant supply notches in a portion surrounded by an alternate long and short dash line in FIG. It is a sectional side view which shows the assembly | attachment to the housing of the rotary electric machine which concerns on the said embodiment. It is a sectional side view of the motor of a prior art. It is a figure which shows typical stator vibration mode. It is a figure which shows typical stator vibration mode.

Next, a rotating electrical machine according to an embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.
(Embodiment)
FIG. 1 is a side sectional view of a rotating electrical machine according to an embodiment of the present invention. FIG. 2 is a perspective view of the stator core laminate.
The motor 100 (rotary electric machine) according to the present embodiment is a thin motor as shown in FIG. 2 mounted on a hybrid vehicle (vehicle), for example (the shape is deformed in FIG. 1).
As shown in FIG. 1, the motor 100 includes a rotor 110 and a stator 120 that rotates the rotor 110.
In addition, a refrigerant circulation pipe 30 is disposed on the stator 120. The refrigerant circulation pipe 30 discharges the refrigerant in the refrigerant supply pipe (not shown) to the upper part of the rotating electrical machine main body.
Although not particularly illustrated, the rotor 110 includes a plurality of annular steel plates fixed to the shaft 101 (see FIG. 4) and a plurality of permanent magnets provided between the plurality of annular steel plates, and is generated by the stator 120. It rotates around the axis O by a rotating magnetic field.

Stator 120 includes a first stator core laminate 121 in which a plurality of steel plates having the same shape are laminated, a second stator core laminate 122 in which a plurality of steel plates having the same shape are laminated, and a first stator core laminate 121 and a second stator core laminate. And a stator coil 123 (see FIG. 4) provided at 122.
In the first stator core laminate 121 and the second stator core laminate 122, two stator cores having the same shape are combined in a set. In other words, the stator 120 is divided into two in the axial direction by the first stator core laminated body 121 and the second stator core laminated body 122 having the same shape.
The first stator core laminate 121 and the second stator core laminate 122 have substantially the same laminate thickness. Note that the first stator core laminate 121 and the second stator core laminate 122 may have different laminate thicknesses.

The stator 120 will be described in more detail.
As shown in FIG. 2, the first stator core laminated body 121 is formed in the fastened part 121a and the fastened part 121a that are formed to project six on the outer peripheral surface at an interval of θ1: 60 degrees with the axis O as the center. It has a through-hole 121b for passing through the shaft portion of the mounting bolt B1 in the front-rear direction, and a protrusion 121c for positioning between the second stator core laminate 122 on the outer peripheral surface.
The second stator core laminated body 122 has a fastened portion 122a formed on the outer peripheral surface at an interval of θ1: 60 degrees around the axis O, and a shaft portion of the mounting bolt B2 formed on the fastened portion 122a. It has a through hole 122b for penetrating in the front-rear direction and a protrusion 122c for positioning between the first stator core laminate 121 on the outer peripheral surface.

  As shown in FIG. 2, the first stator core multilayer body 121 and the second stator core multilayer body 122 are arranged with an angle θ2 shifted from each other in the circumferential direction. In the present embodiment, the first stator core laminated body 121 and the second stator core laminated body 122 are arranged with an equal phase shift (θ2: 30 degrees).

  As described above, the first stator core laminated body 121 and the second stator core laminated body 122 are composed of two sets of stator cores having the same shape, but they are shifted in phase equally (θ2: 30 degrees). Are arranged opposite each other. Therefore, as shown in FIG. 2, the fastened part 121a and the through hole 121b of the first stator core multilayer body 121 and the fastened part 122a and the through hole 122b of the second stator core multilayer body 122 are equally phase-shifted. Yes. As shown in FIG. 1, the first stator core laminated body 121 includes a through hole 121 b of the fastened part 121 a and a shaft part of the mounting bolt B <b> 1 penetrating from one side in the axial direction. Fastened to the inner wall. The second stator core laminated body 122 is fastened to the inner wall of an intermediate case 160 described later, with the shaft portion of the mounting bolt B2 passing through the through hole 122b of the fastened portion 122a from the other side in the axial direction. As for the insertion direction of the mounting bolts B1 and B2, for example, the tips of the mounting bolts B1 and B2 are inserted from the joint side of the first stator core multilayer body 121 and the second stator core multilayer body 122 outward (see FIG. 4). .

  Therefore, although the first stator core laminated body 121 and the second stator core laminated body 122 have the same shape, they are arranged to face each other with an equal phase shift, so that the mounting direction to the case is opposite as viewed from the axial direction. . When the first stator core laminated body 121 and the second stator core laminated body 122 are integrated, the stator 120 has a double-sided support structure when viewed as a whole.

As shown in FIG. 1, a refrigerant distribution plate 130 (described later) is installed between the first stator core laminate 121 and the second stator core laminate 122.
The refrigerant distribution plate 130 uses a structure in which the first stator core laminated body 121 and the second stator core laminated body 122 are combined, and uses the gap as a refrigerant flow path.
The refrigerant distribution plate 130 receives the refrigerant and distributes the refrigerant between the first stator core laminated body 121 and the second stator core laminated body 122.

FIG. 3 is a view showing the configuration of the electromagnetic steel plate 220 of the first stator core laminate 121 and the second stator core laminate 122, FIG. 3 (a) is a plan view thereof, and FIG. 3 (b) is FIG. It is an enlarged view of the part enclosed with the dashed-dotted line. In addition, in FIG. 3, illustration is abbreviate | omitted about the to-be-fastened part 122a, the through-hole 122b, and the protrusion 121c.
The electromagnetic steel sheet 220 is a ring-shaped member made of an excellent material such as iron loss value, magnetic flux density, and magnetic permeability, and an outer surface is coated with an insulating coating.
As shown in FIG. 3, the electromagnetic steel sheet 220 has a ring-shaped body layer 221 that is laminated to form a core body, and a plurality of teeth that protrude radially inward from the inner peripheral edge 221 a of the body part 221 at equal intervals. 222, a plurality of slots 223 which are spaces formed between the plurality of teeth 222, a refrigerant hole 224 penetrating in the stacking direction (thickness direction) of the outer peripheral edge 221b of the core body 221, and adjacent teeth 222a. And a refrigerant supply notch 225 having a notch 222b and a groove formed in the main body 221.
The electromagnetic steel sheet 220 having the coolant supply notch 225 is formed with a thickness of, for example, 0.3 mm. For example, six electromagnetic steel sheets 220 are laminated with the positions of the coolant supply notches 225 aligned. The refrigerant supply notch 225 of the laminated electromagnetic steel plates 220 constitutes the refrigerant distribution plate 130 (see FIG. 1).

FIG. 4 is a perspective view showing a laminated structure of the electromagnetic steel plates 220 having the refrigerant supply notches 225, and FIG. 4A is a perspective view showing three refrigerant supply notches 225 opened at different positions. 4 (b) to 4 (d) are perspective views showing the respective refrigerant supply notches 225 in a portion surrounded by a one-dot chain line in FIG. 4 (a).
As shown in FIG. 4A, six electromagnetic steel plates 220 are laminated with a thickness of 0.3 mm, for example, and the six laminated electromagnetic steel plates 220 are positioned at the coolant supply notch 225 position (groove position). The layer is laminated again by changing the phase of). In the lamination example of FIG. 4, the thickness is 5.4 mm and the groove is three places with six laminations × 3 sets.
As indicated by the arrows in FIG. 1, the refrigerant discharged from the refrigerant circulation pipe 30 (see FIG. 1) falls onto the upper portion of the stator 120 (see FIG. 1). The refrigerant falling on the upper part of the stator 120 is supplied to the refrigerant supply notch 225 (refrigerant distribution plate 130 in FIG. 1) of the electromagnetic steel plate 220, as indicated by arrows in FIGS. 4 (b) to (d). The refrigerant flows from the coolant supply notch 225 to the stator coil (not shown). The refrigerant can flow in the radial direction of the stator 120 and can be distributed inside the stator core to improve the cooling performance of the rotary electric motor.

FIG. 5 is a side sectional view showing assembly of the rotating electrical machine according to the present embodiment to the housing.
As shown in FIG. 5, the motor 100 includes a shaft 101 extending in the front-rear direction around the axis O <b> 1, a rotor 110 fixed to the shaft 101, a stator 120 that rotates the rotor 110, and a rear opening of the stator 120. A motor case 150 that is a housing that closes the housing 120, and an intermediate case 160 that is a lid portion that closes the front opening of the stator 120.

The shaft 101 is pivotally supported by a bearing 102 installed in the motor case 150 and a bearing 103 installed in the intermediate case 160.
The intermediate case 160 has a flange portion 160 a and is combined with the opening portion 150 a of the motor case 150 to complete a housing (case).
A bolt insertion hole 151 for fastening the bolt B <b> 1 penetrating through the through hole 121 b of the second stator core laminate 121 is opened in the inner wall of the motor case 150. Further, a tool escape opening 152 is opened in the motor case 150. The tool escape opening 152 is open to the gear box side.
A bolt insertion hole 161 for fastening the bolt B <b> 2 penetrating the through hole 122 b of the second stator core laminated body 122 is opened in the inner wall of the intermediate case 160.

Hereinafter, a method for assembling the rotating electrical machine configured as described above will be described.
As shown in FIG. 5, a bolt insertion hole 151 is formed in the inner wall of the motor case 150, and a bolt insertion hole 161 is formed in the inner wall of the intermediate case 160.

  First, the process of combining the first stator core laminate 121 and the second stator core laminate 122 is executed. The first stator core laminate 121 and the second stator core laminate 122 can be easily positioned by combining the protrusions 121c and 122c formed on the outer peripheral surface.

  Next, a step of passing the mounting bolt B1 through the through hole 121b of the fastened part 121a of the first stator core laminate 121 and screwing it into the bolt insertion hole 151 on the inner wall of the motor case 150 is performed.

Next, a process of assembling the rotor 110 to the motor case 150 is executed.
Next, the process of assembling the intermediate case 160 with the motor case 150 is executed. Specifically, the flange 160a of the intermediate case 160 is aligned with the opening 150a of the motor case 150, and bolts (not shown) are fastened.

  Finally, a step of passing the mounting bolt B2 through the through hole 122b of the fastened portion 122a of the second stator core laminated body 122 and screwing it into the bolt insertion hole 161 on the inner wall of the intermediate case 160 (lid) is executed.

  When performing the above steps, the tool escape opening 152 opened in the motor case 150 can be used to easily perform the operation.

As described above, the stator 120 includes the first stator core laminated body 121 in which a plurality of identical-shaped steel plates are laminated, and the second stator core laminated body 122 in which a plurality of identical-shaped steel plates are laminated. The 1st stator core laminated body 121 and the 2nd stator core laminated body 122 combine the stator core of the same shape by point symmetry, and both become integral and become a both-sides support structure.
Since the first stator core multilayer body 121 and the second stator core multilayer body 122 are arranged to face each other with an equal phase shift, the mounting direction to the case is opposite to the axial direction. For this reason, when the 1st stator core laminated body 121 and the 2nd stator core laminated body 122 are united, the stator 120 becomes a both-sides support structure. The 1st stator core laminated body 121 and the 2nd stator core laminated body 122 can be united by being crimped | bonded by the fastening means from both sides. At this time, when the first stator core laminate 121 and the second stator core laminate 122 are formed with concavities and convexities that fit with each other, they can be integrated. If an adhesive is used at the seam, it can be integrated more firmly.
Since the stator 120 has a double-sided support structure, it is possible to increase rigidity and reduce motor stator vibration displacement. The mouth opening mode shown in FIG. 8 can be suppressed.

In the stator 120, the motor stator core is divided into two parts and the phases are shifted from each other, so that the deformation can be caused in the opposite phase of the resonance mode, and the effect of canceling the vibration can be obtained.
Thereby, the circular secondary, the circular tertiary, the circular quaternary, and the circular quintic shown in FIG. 7 can act in the direction of canceling at the same frequency.

  Further, the first stator core laminate 121 and the second stator core laminate 122 are attached to the bolt insertion holes 151 and 161 on the inner wall of the case without providing a special case attachment portion in the motor case 150 and the intermediate case 160 (lid). be able to. Since the case mounting portion is unnecessary, the number of mounting locations can be increased without increasing the weight, and the stator ring rigidity can be improved.

  Further, the cooling performance can be improved by providing the refrigerant distribution plate 130 in the middle of the two divided stator cores. The refrigerant distribution plate 130 uses a structure in which the first stator core laminated body 121 and the second stator core laminated body 122 are combined, and is easy to install.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted based on the content described in this specification.
For example, the first stator core multilayer body 121 and the second stator core multilayer body 122 are phase-shifted equally. Even if the effect of acting in the direction of canceling out at the same frequency with respect to the circular secondary, the circular tertiary, the circular quaternary, and the circular quintic is reduced by setting the equal phase shift to another phase shift, It is possible to reduce the harmonic components.

  Although a hybrid vehicle has been mentioned, the present invention is not limited to this as long as the vehicle includes a rotating electric machine (motor and generator). For example, the hybrid vehicle may be an electric vehicle or a fuel cell vehicle that does not have an engine and uses only a motor as a drive source.

30 Refrigerant circulation pipe 100 Motor (rotary electric machine)
DESCRIPTION OF SYMBOLS 110 Rotor 101 Shaft 102, 103 Shaft 120 Stator 121 1st stator core laminated body 121a, 122a Fastened part 121b, 122b Through-hole 122 2nd stator core laminated body 130 Refrigerant distribution plate 150 Motor case 151,162 Bolt insertion hole 152 Tool escape opening 160 160 Inter-case (lid)
160a Flange 220 Magnetic Steel 221 Main Body 222 Teeth 223 Slot 224 Refrigerant Hole 225 Refrigerant Supply Notch B1, B2 Mounting Bolt

Claims (6)

A rotating electrical machine that houses a stator core formed by laminating a plurality of steel plates, a rotor, and a rotating shaft in a case,
The stator core includes a first stator core laminate having a mounting portion and a plurality of steel plates having the same shape, and a second stator core having a mounting portion and a plurality of steel plates having a shape corresponding to the steel plates of the first stator core laminate. A stator core laminate, and
The rotating electric machine, wherein the first stator core laminate is fixed to the case on one side in the axial direction, and the second stator core laminate is fixed on the other side in the axial direction. 2. The rotating electrical machine according to claim 1, wherein the first stator core multilayer body and the second stator core multilayer body are arranged so as to be shifted in the circumferential direction. 2. The rotating electrical machine according to claim 1, wherein the first stator core laminate and the second stator core laminate have substantially the same laminate thickness. The rotating electrical machine according to claim 1, wherein the first stator core laminate and the second stator core laminate have different laminate thicknesses. The rotating electrical machine according to claim 1, wherein a refrigerant distribution plate that receives the refrigerant and distributes the refrigerant into the stator core is disposed between the first stator core laminate and the second stator core laminate. A method of assembling a rotating electrical machine that houses a stator core formed by laminating a plurality of steel plates, a rotor, and a rotating shaft in a case,
The case is provided with a mounting bolt insertion hole,
Combining the first stator core laminate and the second stator core laminate;
Assembling the first stator core laminate in the case;
Assembling the rotor into the case;
Assembling a lid on the case;
And a step of assembling the lid on the lid through a mounting bolt in the second stator core laminate.