JP2018129943A - Stator of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator of a rotary electric machine having a neutral phase and having a simple structure.SOLUTION: The stator of a rotary electric machine includes a stator holder 20 that is made of a material that can be energized and holds a stator core 31, on the side opposite to the side on which a rotor of the rotary electric machine is disposed in a radial direction. In the stator, a terminal end 41be of a winding 41 connected to a neutral point of each phase coil 40 is in contact with any position of the stator core 31, and a terminal connection portion that is electrically connected to the stator holder 20 is provided.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a stator for a rotating electrical machine.

  Patent Document 1 includes a three-phase structure including an annular stator core held in a housing, and a plurality of coils arranged in an annular shape by winding a copper wire around each tooth formed on the inner peripheral side of the stator core. An AC motor stator is described.

Japanese Patent Laid-Open No. 2015-1000026

  The stator described in Patent Document 1 is arranged so as to be shifted from each other in the circumferential direction, and electrically connects three bus bars corresponding to the U-phase, V-phase, and W-phase, and the neutrality of each phase coil. A neutral point bus bar that electrically connects the points and a bus bar base that accommodates all the bus bars in an annular groove are provided. In the stator, the neutral point of each phase coil is connected by a neutral point bus bar, and the neutral point bus bar is provided in an arc shape along the circumferential direction of the stator. Therefore, the structure becomes complicated and man-hours are required for assembly. . Further, since the neutral point bus bar is necessary as a dedicated part, the cost increases accordingly.

  An object of the present invention is to provide a stator for a rotating electrical machine having a simple structure having a neutral phase.

In order to achieve the above object, the invention described in claim 1
A stator core (for example, a stator core 31 in an embodiment described later) having a plurality of teeth (for example, teeth 33 in an embodiment described later) arranged along the circumferential direction;
A stator (for example, a stator 10 in an embodiment described later) of a rotating electrical machine, including three-phase coils (for example, a coil 40 in an embodiment described later) wound around the teeth. ,
A holding member (for example, a stator holder 20 in an embodiment described later) that holds the stator core is provided on the side opposite to the side where the rotor of the rotating electrical machine is disposed in the radial direction,
The holding member is made of an energizable material,
The end of each phase coil connected to the neutral point of each phase coil (for example, the end portion 41be in the embodiment described later) is in contact with any position of the stator core and is electrically connected to the holding member. A terminal connection portion is provided.

The invention according to claim 2 is the invention according to claim 1,
The holding member holds the stator core on the outer peripheral side in the radial direction,
The terminal connection portion is formed in a convex shape on the outer peripheral surface of the stator core (for example, the outer peripheral surface 35 in an embodiment described later).

In the invention according to claim 3, in the invention according to claim 2,
On the inner peripheral surface of the holding member (for example, the inner peripheral surface 21 in the embodiments described later), recesses (for example, the recesses 25 and 27 in the embodiments described later) corresponding to the shape of the terminal connection portion are formed. And
In a state where the holding member holds the stator core, the terminal connection portion is fitted with the recess.

The invention according to claim 4 is the invention according to claim 2 or 3,
The terminal connection portion includes a terminal end of each phase coil positioned on the outer peripheral surface of the stator core (for example, a terminal end portion 41be in an embodiment described later) and solder (for example, described later) that fixes the terminal end to the outer peripheral surface. The solder portion 36) in the embodiment.

Further, in the invention according to claim 5, in the invention according to claim 2 or 3,
The terminal connection portion is a terminal end of each phase coil (for example, a terminal end portion 41be in an embodiment described later) disposed in the axial direction on the outer peripheral surface of the stator core and having the insulating coating peeled off.

The invention according to claim 6 is the invention according to claim 1,
Each terminal coil is positioned on the axially outer surface (for example, the axially outer surface 37 in the embodiment described later) of the stator core yoke (for example, the yoke 32 in the embodiment described later). Terminal (for example, a terminal portion 41be in an embodiment described later) and solder (for example, a solder portion 38 in an embodiment described later) for fixing the terminal to the yoke.

In the invention according to claim 7, in the invention according to any one of claims 1 to 6,
The holding member is supported by a housing (for example, a housing 12 in an embodiment described later) that houses the rotating electrical machine via an insulating portion (for example, a spacer 13 in an embodiment described later).

  According to the first aspect of the present invention, when the terminal end of each phase coil is in contact with any position of the stator core and electrically connected to the holding member at the terminal connection portion, the holding member itself made of a material that can be energized is Functions as a sex phase. For this reason, the neutral point of each phase coil can be connected to the neutral phase with a simple structure without using a dedicated component such as a neutral point bus bar. Further, since there is no need to provide a current return path by a neutral point bus bar or the like, copper loss can be suppressed, cost can be reduced, and the stator can be downsized.

  According to the second aspect of the present invention, the holding member holds the stator core on the outer peripheral side in the radial direction, and the terminal connection portion is formed in a convex shape on the outer peripheral surface of the stator core. Is deformed, and the neutral point of each phase coil is reliably electrically connected to the holding member via the deformed terminal connection portion.

  According to the invention of claim 3, a recess corresponding to the shape of the terminal connection portion is formed on the inner peripheral surface of the holding member, and when the stator core is press-fitted into the holding member, the terminal connection portion fits into the recess, The neutral point of each phase coil is reliably electrically connected to the holding member via the terminal connection portion.

  According to the fourth aspect of the present invention, since the end of each phase coil is electrically connected to the holding member via the solder, the risk of disconnection of each phase coil when the stator core is press-fitted into the holding member can be reduced.

  According to the invention of claim 5, the neutral point of each phase coil can be connected to the neutral phase with a simple structure that does not require soldering.

  According to the sixth aspect of the present invention, the neutral point of each phase coil can be connected to the neutral phase with a simple structure that does not require processing on the inner peripheral surface of the holding member.

  According to the seventh aspect of the present invention, the holding member into which the stator core is press-fitted is supported by the housing that houses the rotating electrical machine via the insulating portion, and therefore the holding member that functions also as a neutral phase and the housing are electrically connected. Insulated.

It is a side view of the stator of the rotary electric machine which concerns on one Embodiment. It is a principal part disassembled perspective view of the stator of 1st Embodiment. It is a side view of the stator attached to the housing via the spacer. It is a principal part disassembled perspective view of the stator of 2nd Embodiment. It is a principal part disassembled perspective view of the stator of 3rd Embodiment.

  Hereinafter, each embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a side view of a stator of a rotating electrical machine according to an embodiment. The stator 10 shown in FIG. 1 constitutes a rotating electrical machine in combination with a rotor (not shown) provided therein.

  The stator 10 is a so-called three-phase Y-connection salient-pole stator. As shown in FIG. 1, the stator 10 is annularly formed along a stator holder 20 that is an annular holding member and an inner peripheral surface 21 of the stator holder 20. A plurality of (in FIG. 1, 18) stator pieces 30 and three-phase input terminals U, V, and W provided on the stator holder 20 are provided.

  The stator holder 20 is made of a conductive steel material, and includes an annular portion 22 that extends in the axial direction of the stator 10, and a flange portion 23 that extends from the axial end of the annular portion 22 toward the outer peripheral side. As will be described later, a plurality (18 in FIG. 1) of concave portions 25 are formed in the inner peripheral surface 21 of the annular portion 22 in the axial direction corresponding to each stator piece 30 (see FIG. 2). The flange portion 23 is provided with a plurality of bolt holes 26, and the stator 10 is fixed to the housing 12 of the rotating electrical machine by the bolts 11 inserted through the bolt holes 26 (see FIG. 3).

  The stator holder 20 holds the plurality of stator pieces 30 from the outside in the radial direction by press-fitting the plurality of stator pieces 30 arranged in an annular shape into the inner peripheral surface 21 of the annular portion 22.

  FIG. 2 is an exploded perspective view of a main part of the stator 10. As shown in FIG. 2, each stator piece 30 of the stator 10 includes a yoke 32 extending along the circumferential direction of the stator 10 and a tooth 33 extending radially inward from the yoke 32. It includes a stator core 31 formed in a substantially T shape, and a coil 40 formed by a winding 41 wound around a tooth 33 of the stator core 31. In addition, the coil | winding 41 has the structure by which the insulating coating was carried out to the copper core wire.

  The stator core 31 is formed by laminating a plurality of electromagnetic steel plates 34 that are pressed into a substantially T shape. When winding the winding 41 around the teeth 33, an insulator (not shown) that electrically insulates the stator core 31 and the winding 41 may be interposed in the teeth 33.

  In the present embodiment, each of the coils 40 includes six U-phase coils, V-phase coils, and W-phase coils. As shown in FIG. 1, by arranging a plurality of stator pieces 30 in an annular shape, a U phase (U1 phase to U6 phase), a V phase (V1 phase to V6 phase), and a W phase (W1 phase to W6 phase). Are arranged in the order of U1, V1, W1, U2,..., U6, V6, W6 in the clockwise direction.

  One end 41a of the winding 41 that is wound around the teeth 33 of the stator core 31 to constitute each phase coil is grouped for each of the U phase, the V phase, and the W phase, and the input terminals U of each phase shown in FIG. Connected to V and W. In this embodiment, six windings 41 of each phase of U1 phase to U6 phase, V1 phase to V6 phase, and W1 phase to W6 phase are collected for each phase and connected to input terminals U, V, and W. Is done.

  In addition, at the other end 41 b of the winding 41 constituting each phase coil, the terminal portion 41 be from which the insulating film has been peeled is soldered to the outer peripheral surface 35 of the stator core 31. As a result, a convex solder portion 36 is formed on the outer peripheral surface 35 where the end portion 41be of the winding 41 is soldered.

  The plurality of stator pieces 30 configured in this manner are annularly arranged and press-fitted into the inner peripheral surface 21 of the annular portion 22 of the stator holder 20. At this time, the plurality of stator pieces 30 are press-fitted in a state where each solder portion 36 is aligned with the concave portion 25 formed on the inner peripheral surface 21 of the annular portion 22 of the stator holder 20. By keeping the size of the recess 25 slightly smaller than the size of the solder portion 36, the solder portion 36 is press-fitted into the recess 25 while being deformed. As a result, the end portion 41be of the winding 41 is electrically connected to the energized stator holder 20 via the solder portion.

  In the present embodiment, the end portions 41be of the windings 41 constituting the U-phase, V-phase, and W-phase coils that are Y-connected are connected to the stator holder via the solder portions 36 on the outer peripheral surface 35 of each stator piece 30. Since the stator holder 20 is electrically connected to the stator 20, the stator holder 20 becomes a neutral phase. Since the stator holder 20 is composed of a multilayer steel plate, the electrical resistivity per unit area is higher than that of the winding 41 having a copper core wire. However, since the stator holder 20 is overwhelmingly larger in cross-sectional area than the winding 41, the electrical resistance per length as an energization path is significantly lower in the stator holder 20.

  As shown in FIG. 3, the stator 10 in which the plurality of stator pieces 30 are press-fitted into the stator holder 20 that also functions as a neutral phase is fixed between the flange portion 23 of the stator holder 20 and the housing 12. With the resin spacer 13 interposed therebetween, the bolt 11 is inserted into the bolt hole 26 to support the stator holder 20. The potential of the stator holder 20 that is a neutral phase is 0 volts when the potentials of the U phase, V phase, and W phase are perfectly balanced, but the actual phase potentials are not completely balanced. Therefore, some potential is generated in the stator holder 20. However, in the present embodiment, since the spacer 13 is formed of a highly insulating resin, the stator holder 20 and the housing 12 are electrically insulated.

  As described above, according to the present embodiment, the solder portion 36 formed by soldering the terminal portion 41be of the winding wire 41 constituting each phase coil to the outer peripheral surface 35 of the stator core 31 includes a plurality of stator pieces. When 30 is press-fitted into the inner peripheral surface 21 of the annular portion 22 of the stator holder 20, it is press-fitted into the recess 25 formed in the inner peripheral surface 21. As a result, the end portion 41be of the winding 41 is electrically connected to the stator holder 20 via the solder portion. When the terminal portion 41be of the winding wire 41 constituting the U-phase, V-phase, and W-phase coils that are Y-connected is electrically connected to the stator holder 20, the energized stator holder 20 itself becomes the neutral phase. Function as. For this reason, the neutral point of each phase coil can be connected to the neutral phase with a simple structure without using a dedicated part such as a neutral point bus bar. Further, since there is no need to provide a current return path by a neutral point bus bar or the like, copper loss can be suppressed, cost can be reduced, and the stator can be downsized.

  Further, the stator holder 20 holds the plurality of stator pieces 30 on the outer peripheral side in the radial direction, and the solder portion 36 is formed in a convex shape on the outer peripheral surface 35 of the stator core 31, so that the plurality of stator pieces 30 are attached to the stator holder 20. When the press fitting is performed, the solder portion 36 is deformed, and the terminal portion 41be of the winding 41 is reliably electrically connected to the stator holder 20 through the deformed solder portion 36.

  A recess 25 corresponding to the shape of the solder portion 36 is formed on the inner peripheral surface 21 of the stator holder 20, and when a plurality of stator pieces 30 are press-fitted into the stator holder 20, the solder portion 36 is fitted into the recess 25. Therefore, the end portion 41be of the winding 41 is reliably electrically connected to the stator holder 20 via the solder portion.

  Further, since the terminal end 41be of the winding 41 is electrically connected to the stator holder 20 via the solder portion 36, there is a risk of disconnection of the winding 41 when the plurality of stator pieces 30 are press-fitted into the stator holder 20. Can be reduced.

  Further, since the stator holder 20 into which the plurality of stator pieces 30 are press-fitted is supported by the housing 12 that houses the rotating electrical machine via the spacer 13 formed of a highly insulating resin, it also functions as a neutral phase. The stator holder 20 and the housing 12 are electrically insulated.

(Second Embodiment)
FIG. 4 is an exploded perspective view of a main part of the stator according to the second embodiment. The stator of the second embodiment is different from the stator 10 of the first embodiment in that the connection structure between the terminal end 41be and the stator holder 20 at the other end 41b of the winding 41 is different. Except for this point, the second embodiment is the same as the first embodiment, and in FIG. 4, the same or equivalent reference numerals are given to the same components as those in FIG. 2, and the description will be simplified or omitted.

  As shown in FIG. 4, in the stator of the present embodiment, similarly to the stator piece 30 of the first embodiment, one end 41 a of the winding 41 that is wound around the teeth 33 of the stator core 31 and constitutes each phase coil is The U-phase, V-phase, and W-phase are collected and connected to the input terminals U, V, and W of each phase shown in FIG. Also in this embodiment, six windings 41 of each phase of U1 phase to U6 phase, V1 phase to V6 phase, and W1 phase to W6 phase are collected for each phase and connected to input terminals U, V, and W. Is done.

  In addition, at the other end 41 b of the winding 41 constituting each phase coil, the terminal portion 41 be from which the insulating coating is peeled is disposed in the outer peripheral surface 35 of the stator core 31 in the axial direction and temporarily fixed.

  As in the first embodiment, the stator holder 20 includes an annular portion 22 and a flange portion 23, and a plurality of concave portions 27 corresponding to each stator piece 30 is formed on the inner peripheral surface 21 of the annular portion 22. Are formed in the axial direction. The size of each concave portion 27 is slightly smaller than the thickness of the end portion 41be of the winding 41 from which the insulating film has been peeled off.

  Also in this embodiment, the plurality of stator pieces 30 are annularly arranged and press-fitted into the inner peripheral surface 21 of the annular portion 22 of the stator holder 20. At this time, the plurality of stator pieces 30 are press-fitted while the terminal portions 41be of the respective windings 41 are fitted into the recesses 27 of the stator holder 20. As a result, the terminal end 41be of the winding 41 is electrically connected to the stator holder 20 that can be energized. In this way, since the terminal portion 41be of the winding 41 constituting the U-phase, V-phase, and W-phase coils that are Y-connected is electrically connected to the stator holder 20, the stator holder 20 is in a neutral phase. It becomes.

  As described above, according to the present embodiment, a plurality of stator pieces are provided in a state in which the terminal portions 41be of the windings 41 constituting the respective phase coils are axially arranged on the outer peripheral surface 35 of the stator core 31 and temporarily fixed. When 30 is press-fitted into the inner peripheral surface 21 of the annular portion 22 of the stator holder 20, the end portion 41 be of the winding 41 is fitted into the concave portion 27 formed in the inner peripheral surface 21. As a result, the terminal end 41be of the winding 41 is electrically connected to the stator holder 20. When the terminal portion 41be of the winding wire 41 constituting the U-phase, V-phase, and W-phase coils that are Y-connected is electrically connected to the stator holder 20, the energized stator holder 20 itself becomes the neutral phase. Function as. Thus, the neutral point of each phase coil can be connected to the neutral phase with a simple structure that does not require soldering.

(Third embodiment)
FIG. 5 is an exploded perspective view of a main part of the stator according to the third embodiment. The stator of the third embodiment differs from the stator 10 of the first embodiment in that the connection structure between the terminal end 41be and the stator holder 20 at the other end 41b of the winding 41 is different. Except for this point, the second embodiment is the same as the first embodiment, and in FIG. 5, the same or equivalent reference numerals are given to the same components as those in FIG. 2, and the description will be simplified or omitted.

  As shown in FIG. 5, in the stator of the present embodiment, like the stator piece 30 of the first embodiment, one end 41 a of the winding 41 wound around the teeth 33 of the stator core 31 and constituting each phase coil is The U-phase, V-phase, and W-phase are collected and connected to the input terminals U, V, and W of each phase shown in FIG. Also in this embodiment, six windings 41 of each phase of U1 phase to U6 phase, V1 phase to V6 phase, and W1 phase to W6 phase are collected for each phase and connected to input terminals U, V, and W. Is done.

  In addition, at the other end 41 b of the winding 41 constituting each phase coil, the terminal end 41 be from which the insulating coating has been peeled is soldered to the axially outer side surface 37 of the yoke 32 of the stator core 31. As a result, a convex solder portion 38 is formed on the outer peripheral surface 35 where the end portion 41be of the winding 41 is soldered. The stator core 31 provided with the solder portion 38 is configured by laminating a plurality of electromagnetic steel plates 34. For this reason, the terminal portion 41be of the winding 41 fixed by the solder portion 38 is in a state of being electrically connected to the stator core 31.

  The stator holder 20 has an annular portion 22 and a flange portion 23 as in the first embodiment, but no recess is formed on the inner peripheral surface 21 of the annular portion 22.

  Also in this embodiment, the plurality of stator pieces 30 are annularly arranged and press-fitted into the inner peripheral surface 21 of the annular portion 22 of the stator holder 20. When the plurality of stator pieces 30 are press-fitted into the stator holder 20, the outer peripheral surface 35 of each stator core 31 comes into contact with the inner peripheral surface 21 of the annular portion 22 of the stator holder 20, so that the stator core 31 and the stator holder 20 are electrically connected. It becomes a state. As a result, the end portion 41be of the winding 41 is electrically connected to the energized stator holder 20 via the solder portion 38 and the stator core 31. In this way, since the terminal portion 41be of the winding 41 constituting the U-phase, V-phase, and W-phase coils that are Y-connected is electrically connected to the stator holder 20, the stator holder 20 is in a neutral phase. It becomes.

  As described above, according to the present embodiment, the terminal portion 41be of the winding 41 constituting each phase coil is soldered to the axially outer side surface 37 of the yoke 32 of the stator core 31, so that the neutrality of each winding 41 is obtained. A plurality of stator pieces 30 are press-fitted into the inner peripheral surface 21 of the annular portion 22 of the stator holder 20 in a state where the points are electrically connected to the stator core 31. As a result, the end portion 41be of the winding 41 is electrically connected to the stator holder 20 via the solder portion 38 and the stator core 31. When the terminal portion 41be of the winding wire 41 constituting the U-phase, V-phase, and W-phase coils that are Y-connected is electrically connected to the stator holder 20, the energized stator holder 20 itself becomes the neutral phase. Function as. Thus, the neutral point of each phase coil can be connected to the neutral phase by a simple structure that does not require processing on the inner peripheral surface 21 of the stator holder 20.

  The present invention is not limited to the embodiments described above, and modifications, improvements, and the like can be made as appropriate.

DESCRIPTION OF SYMBOLS 10 Stator 12 Housing 13 Spacer 20 Stator holder 21 Stator holder inner surface 25, 27 Recess 30 Stator piece 31 Stator core 32 Yoke 33 Teeth 35 Stator core outer surface 36, 38 Solder part 37 Stator core axial outer surface 40 Coil 41 Winding Wire 41a Winding end 41b Winding other end 41be Termination part U, V, W Input terminal

Claims (7)

A stator core having a plurality of teeth arranged along the circumferential direction;
A three-phase coil wound around the teeth, and a stator of a rotating electrical machine,
A holding member for holding the stator core is provided on a side opposite to a side where the rotor of the rotating electrical machine is disposed in the radial direction
The holding member is made of an energizable material,
A stator of a rotating electrical machine, comprising a terminal connection portion where a terminal of each phase coil connected to a neutral point of each phase coil is in contact with any position of the stator core and electrically connected to the holding member. A stator for a rotating electrical machine according to claim 1,
The holding member holds the stator core on the outer peripheral side in the radial direction,
The terminal connection part is a stator of a rotating electrical machine formed in a convex shape on an outer peripheral surface of the stator core. A stator for a rotating electrical machine according to claim 2,
On the inner peripheral surface of the holding member, a recess corresponding to the shape of the terminal connection portion is formed,
A stator of a rotating electrical machine in which the terminal connection portion is fitted to the concave portion in a state where the holding member holds the stator core. A stator for a rotating electrical machine according to claim 2 or 3,
The terminal connection portion is a stator of a rotating electrical machine having a terminal end of each phase coil positioned on the outer peripheral surface of the stator core and solder for fixing the terminal end to the outer peripheral surface. A stator for a rotating electrical machine according to claim 2 or 3,
The terminal connection portion is a stator of a rotating electrical machine, which is an end of each phase coil disposed in an axial direction on an outer peripheral surface of the stator core and having an insulating coating peeled off. A stator for a rotating electrical machine according to claim 1,
The stator for a rotating electrical machine, wherein the terminal connection portion includes a terminal of each phase coil positioned on an outer surface in the axial direction of the yoke of the stator core, and solder for fixing the terminal to the yoke. A stator for a rotating electrical machine according to any one of claims 1 to 6,
The holding member is a stator of a rotating electrical machine supported by a housing that houses the rotating electrical machine via an insulating portion.

Images