JP6200854B2 - Rotating electric machine stator - Google Patents

Description

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

  Patent Document 1 discloses a stator for a rotating electrical machine in which a plurality of stator pieces each having a split core, an insulator surrounding a part of the split core, and a coil that winds the split core via the insulator are arranged in an annular shape. And Patent Document 2.

Japanese Patent No. 3666727 International Publication No. 2013/071190

  FIG. 8 is a partial cross-sectional view perpendicular to the axial direction of a conventional rotating electrical machine. As shown in FIG. 8, the magnetic flux generated when the rotor 101 rotates passes through a part of the coil 105 of the stator 103. An eddy current is generated in the portion of the coil 105 where the magnetic flux has passed. Generation of eddy current in the coil 105 is not desirable because the temperature of the coil 105 rises.

  The objective of this invention is providing the stator of the rotary electric machine which can suppress the temperature rise of the coil by an eddy current.

In order to achieve the above object, the invention described in claim 1
A stator core (e.g., a stator core 25 in an embodiment described later) having a plurality of teeth (e.g., teeth 24b in an embodiment described later) disposed along the circumferential direction;
A coil wound around the teeth (for example, a coil 18 in an embodiment described later);
A stator for a rotating electrical machine comprising an insulating member (for example, an insulator 26 in an embodiment described later) that insulates the teeth and the coil;
A holding member that holds the stator core (for example, a holder 12 in the later-described embodiment) on a side opposite to a side where the rotor of the rotating electrical machine (for example, the rotor 60 in the later-described embodiment) is disposed in the radial direction. With
The holding member is made of a magnetic material having a higher magnetic permeability than the stator core ,
The insulating member is
A winding part body around which the winding of the coil is wound (for example, a winding part body 42 in an embodiment described later);
A first flange (e.g., an inner flange 44 in an embodiment described later) provided at the radially inner end of the winding body;
A second collar part (for example, an outer collar part 46 in an embodiment described later) provided at the radially outer end of the winding part main body,
Of said first flange portion and the second flange portion, the radial thickness of the rotor and one of the flange portions facing is much larger than the radial thickness of the other flange,
The difference between the radial thickness of the radial thickness of said first flange portion and the second flange portion is not larger than the radial thickness of the retaining member.

In the invention according to claim 2 , in the invention according to claim 1 ,
The rotor is disposed radially inward of the rotating electrical machine;
The holding member holds the stator core from the outside in the radial direction.

According to the first aspect of the present invention, the radial distance from the end portion of the teeth facing the rotor to the coil is at least the radial thickness of one flange portion facing the rotor of the insulating member, The radial thickness of the buttocks is greater than the radial thickness of the other buttocks. Since the radial thickness of the collar portion facing the rotor is large, the coil is configured to be separated from the rotor in the radial direction, so that the eddy current generated when the magnetic flux generated when the rotor rotates passes through the coil can be reduced. Therefore, the temperature rise of the coil due to the eddy current can be suppressed.
Further, the radial thickness of the one flange portion is maintained while maintaining the outer diameter of the stator as compared with a stator having a configuration in which the radial thickness of one flange portion facing the rotor is equal to the radial thickness of the other flange portion. However, according to the first aspect of the present invention, the holding member that holds the stator core from the back yoke side is made of a magnetic material. As described above, since the reduction in the radial thickness of the back yoke is compensated by the holding member, magnetic saturation due to the reduction in the radial thickness of the back yoke is suppressed.
Further, since the holding member is made of a magnetic material having a higher magnetic permeability than the stator core, an increase in the radial thickness of the one flange portion can be made larger than the radial thickness of the holding member. Therefore, the generation of eddy currents in the coil can be further reduced without changing the outer diameter of the stator.

According to the invention of claim 2 , it can be applied to an inner rotor type rotating electrical machine.

It is a top view of the stator of one embodiment concerning the present invention. FIG. 2 is a partial cross-sectional view perpendicular to the axial direction of the stator shown in FIG. 1. It is a perspective view of the stator piece shown in FIG. It is a disassembled perspective view of the split core and insulator shown in FIG. It is a figure which compares the structure of the conventional stator and the structure of the stator of one Embodiment which concerns on this invention. It is a figure which shows the relationship between the partial cross section perpendicular | vertical to the axial direction of the stator shown in FIG. 1, and the magnetic flux generated at the time of rotation of a rotor. It is a figure which shows the relationship between the "falling down" which generate | occur | produces due to shrinkage | contraction of an insulator, and the teeth of a split core. It is a partial cross section perpendicular | vertical to the axial direction of the conventional rotary electric machine.

  Hereinafter, embodiments of a stator of a rotating electrical machine according to the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view of a stator 10 of a rotating electrical machine according to the present embodiment. The stator 10 constitutes a rotating electric machine in combination with a rotor (not shown) provided therein, and is used as, for example, an electric motor or a generator.

  The stator 10 is a so-called three-phase Y-type salient-pole stator, and as shown in FIG. 1, a hollow holder 12 and three-phase input terminals U, V, W provided on the holder 12 A neutral terminal N that forms a neutral point, and an annular stator group 16 that is formed by annularly arranging a plurality (18 in FIG. 1) of stator pieces 14 along the inner peripheral surface 12a of the holder 12. I have.

(Annular stator group)
Hereinafter, the annular stator group 16 will be described in detail with reference to FIGS. FIG. 2 is a partial cross-sectional view perpendicular to the axial direction of the stator 10 shown in FIG. FIG. 3 is a perspective view of the stator piece 14 shown in FIG. 4 is an exploded perspective view of the split core 24 and the insulator 26 shown in FIG.

  The annular stator group 16 includes six stator pieces 14 each having U-phase, V-phase, and W-phase coils 18. In this case, in the annular stator group 16, the plurality of stator pieces 14 are arranged in an annular shape, whereby a U phase (U1 phase to U6 phase), a V phase (V1 phase to V6 phase), and a W phase (W1 phase to W1 phase). The coils 18 of (W6 phase) are arranged in the order of U1, V1, W1, U2,..., U6, V6, W6 in the clockwise direction of FIG. In other words, the annular stator group 16 has a stator core 25 in which a plurality of (18 in FIG. 1) divided cores 24 described later are arranged in an annular shape, and windings are wound around each divided core 24 of the stator core 25. And an insulator 26 that insulates each divided core 24 from the coil 18.

  Next, among the stator pieces 14 having the coils 18 of the U1 phase to U6 phase, the V1 phase to V6 phase, and the W1 phase to W6 phase, the configuration of one stator piece 14 will be described representatively. In addition, the structure of the stator piece 14 demonstrated here is a structure common to the stator piece 14 of all the phases.

  As shown in FIGS. 3 and 4, the stator piece 14 is a divided core formed by laminating a plurality of substantially T-shaped electromagnetic steel plates 22 punched by pressing in the rotation axis direction (arrow A direction) of the stator 10. 24, an insulator 26 that electrically insulates the split core 24, and a coil 18 in which a winding 18 a is wound around the split core 24 via the insulator 26. The winding 18a is a rectangular wire having a rectangular cross section.

  The split core 24 includes a back yoke 24a extending along the circumferential direction (arrow C direction) of the stator 10 on the radially outer side (B1 side indicated by arrow B) of the stator 10, and a radially inner side from the back yoke 24a. Teeth 24b extending toward (B2 side indicated by arrow B), and toward the C1 side and C2 side indicated by arrow C along the rotation axis direction (arrow A direction) of stator 10 at the radially inner end of teeth 24b. Each of them extends from a rectangular ear portion 24c. A substantially semicircular fitting recess 32 is formed at the end of the back yoke 24a on the C2 side indicated by the arrow C, and a fitting recess is formed at the end of the back yoke 24a on the C1 side indicated by the arrow C. A substantially semicircular fitting projection 34 corresponding to 32 is formed. When the plurality of divided cores 24 are arranged in an annular shape to form the stator core 25, the fitting concave portions 32 and the fitting convex portions 34 of the back yoke 24a are fitted to each other to position each divided core 24.

  The insulator 26 is an insulating bobbin that is made of an electrically insulating material such as a flexible resin and that insulates the split core 24 from the coil 18. The insulator 26 is wound around the winding portion 38 around which the winding 18a of the coil 18 is wound, and protrudes from the winding portion 38 to the B1 side indicated by the arrow B, so as to guide the winding 18a along the direction of the arrow C. The guide part 40 is provided.

  The winding portion 38 includes an upper winding portion 38a that can be fitted in the direction of arrow A and a lower winding portion 38b.

  The upper winding portion 38a has an upper winding portion main body 42a formed in a substantially U-shaped cross section, and an upper side standing on the end portion on the radially inner side (B2 side indicated by arrow B) of the upper winding portion main body 42a. An inner flange portion 44a, and an upper outer flange portion 46a erected on the end portion on the radially outer side (B1 side indicated by arrow B) of the upper winding portion main body 42a so as to face the upper inner flange portion 44a. Have.

  The lower winding part 38b has a lower winding part body 42b formed in a substantially U-shaped cross section so as to face the upper winding part body 42a and a lower winding part so as to face the upper inner flange part 44a. A lower inner flange portion 44b erected on the radially inner end (B2 side indicated by arrow B) of the rotating portion main body 42b, and the lower winding portion main body 42b so as to face the lower inner flange portion 44b. And a lower outer flange portion 46b erected on the end portion on the radially outer side (B1 side indicated by arrow B).

  When the upper winding portion 38a and the lower winding portion 38b are fitted so as to sandwich the teeth 24b of the split core 24, the upper winding portion main body 42a, the lower winding portion main body 42b, the upper inner flange portion 44a, The lower inner flange portion 44b, the upper outer flange portion 46a, and the lower outer flange portion 46b are partially overlapped and coupled to each other so that the upper winding portion 38a and the lower winding portion 38b are integrated, and the winding is performed. Part 38 is configured. The winding portion 38 formed by integrating the upper winding portion 38a and the lower winding portion 38b includes a winding portion main body 42 around which the winding 18a of the coil 18 is wound, and a winding portion main body 42. An inner flange portion 44 provided at an end portion on the radially inner side (B2 side indicated by arrow B), and a radially outer side of the winding portion main body 42 so as to face the inner flange portion 44 (B1 side indicated by arrow B) And an outer flange portion 46 provided at the end portion of the outer periphery. The thickness in the radial direction (arrow B direction) of the inner flange portion 44 is larger than the thickness in the radial direction (arrow B direction) of the outer flange portion 46.

  At the end on the radially inner side (B2 side indicated by arrow B) of the inner flange portion 44, a rectangular convex portion 43 is provided on the C1 side indicated by arrow C along the rotation axis direction (arrow A direction) of the stator 10. A rectangular concave portion 45 corresponding to the convex portion 43 extends to the C2 side indicated by the arrow C along the coaxial direction. The convex portion 43 and the concave portion 45 of the inner flange portion 44 correspond to each other in a crank shape when the plurality of divided cores 24 surrounded by the insulator 26 are arranged in an annular shape to form the stator core 25.

  A hole 48 is formed in the center of the winding portion 38 along the direction of arrow B. While the teeth 24 b of the split core 24 are fitted into the holes 48, the winding 18 a is wound around the winding portion main body 42 between the inner flange portion 44 and the outer flange portion 46 in the winding portion 38. 18 coil winding portions 21 are formed. The radial distance from the radially inner end of the tooth 24b to the coil winding portion 21 ensures the radial thickness of the inner flange portion 44 of the insulator 26. Accordingly, the coil winding portion 21 is separated from the rotor of the rotating electrical machine to the outside in the radial direction (B1 side indicated by arrow B) by the amount of the radial thickness of the inner flange portion 44 being large.

  On the other hand, the guide portion 40 is provided so as to protrude from the vicinity of the upper end portion of the upper outer flange portion 46a to the B1 side indicated by the arrow B.

  The guide portion 40 is formed on the plate-like member 50 and the plate-like member 50, and has a substantially U-shaped lead wire receiving portion 52 in the plan view of FIG. 1 and a back side of the lead wire receiving portion 52 (B2 side indicated by arrow B) And an end fixing portion 54 for fixing the end portion of the winding 18a wound around the winding portion 38. The conductor accommodating portion 52 is provided with a plurality of conductor end holding grooves extending along the direction of arrow C, and the winding 18a that is pulled out from the winding portion 38 and fixed to the terminal fixing portion 54 is connected to the conductor end portion. The inside of the holding groove is drawn in the direction of arrow C. In this way, the winding 18a is drawn in the direction of the arrow C across the conductor housing portions 52 of the plurality of stator pieces 14 constituting the annular stator group 16, and the coil terminal portion 19 of the coil 18 is configured.

(holder)
Next, the holder 12 that holds the annular stator group 16 will be described in detail with reference to FIGS. 1 and 2.

  The holder 12 includes an annular portion 12b extending in the rotation axis direction of the stator 10 and a flange portion 12c extending from the axial end portion of the annular portion 12b to the outer peripheral side. An annular stator group 16 is press-fitted into the inner peripheral surface 12a of the holder 12, and the holder 12 holds the annular stator group 16 from the radially outer side. Moreover, the annular stator group 16 held by the holder 12 is fixed to a housing (not shown) by inserting bolts into a plurality of bolt holes 12d provided in the flange portion 12c.

  The holder 12 is made of a material having a higher magnetic permeability than the split core 24. That is, the holder 12 is a ferromagnetic body. As shown in FIG. 2, the annular portion 12 b has a constant thickness t with respect to the radial direction (arrow B direction).

  Next, the relationship between the radial thicknesses of the inner flange portion 44 and the outer flange portion 46 of the insulator 26 and the magnetic permeability and radial thickness of the holder 12 will be described with reference to FIGS. 2 and 5. FIG. 5 is a diagram comparing the configuration of the conventional stator shown in FIG. 8 with the configuration of the stator 10 of one embodiment according to the present invention shown in FIG.

  In the present embodiment, the radial thickness s1 of the inner flange portion 44 of the insulator 26 and the radial thickness of the outer flange portion 46 are larger than the radial thickness t of the holder 12 made of a material having higher permeability than the split core 24. The radial thickness of the inner flange portion 44 is designed so that the difference from s2 becomes large. That is, the radial thickness s1 of the inner flange portion 44 is designed so as to have a relationship of “s1−s2 = t + α” (α> 0). The outer diameter of the stator 10 including the holder 12 is preferably equal to or smaller than the outer diameter of the stator 103 of the conventional rotating electric machine shown in FIG.

  Comparing the conventional configuration shown in FIG. 8 with the configuration of the present embodiment shown in FIG. 2 on the assumption that the outer diameter of the stator is the same, the radial thickness of the inner flange portion 44 is as shown in FIG. In addition, if the radial length of the coil winding portion 21 is maintained, the radial thickness of the back yoke 24a constituting the split core 24 becomes thinner by the increase of the radial thickness of the inner flange portion 44. Although the back yoke with a small radial thickness is magnetically saturated and the torque is reduced, in this embodiment, as described above, the reduction in the radial thickness of the back yoke 24a is compensated by the holder 12 made of a ferromagnetic material. ing. Therefore, compared with the stator 103 of the conventional rotating electric machine shown in FIG. 8, in order for the stator 10 of this embodiment to have the relationship of “s1−s2 = t + α” while maintaining the outer diameter, the back yoke 24a Even when the thickness in the radial direction is reduced by t + α (L → L− (t + α)), the magnetic flux interlinking the back yoke 24a of the split core 24 and the holder 12 interlinks the back yoke of the conventional stator 103. What is necessary is just to satisfy the conditions that it is more than magnetic flux. The condition is expressed by the following formula (1).

μst: permeability of the split core 24 μhol: permeability of the holder 12 H: magnetic field L: radial thickness of the back yoke of the conventional stator 103 Δx: unit length in the circumferential direction of the stator

  The left side of Equation (1) indicates the magnetic flux that links the back yoke of the conventional stator 103. The conventional holder of the stator 103 is made of a nonmagnetic material such as resin. Moreover, the right side of Formula (1) shows the sum of the magnetic flux which links the holder 12 in the stator 10 of this embodiment, and the magnetic flux which links the back yoke 24a.

  Α included in the right side of Expression (1) indicates a value that can increase the radial thickness difference (t + α = s1−s2) of the inner flange portion 44 with respect to the outer flange portion 46 to be greater than the radial thickness t of the holder 12. The following formula (2) is derived from the formula (1).

  In the present embodiment, the difference (s1−s2) in the radial thickness of the inner flange portion 44 with respect to the outer flange portion 46 of the insulator 26 is equal to or greater than the radial thickness t of the holder 12 (ie, t + α). In the range that satisfies the conditions shown, the radial thickness s1 of the inner collar portion 44 is set.

  As described above, in the present embodiment, the radial thickness s1 of the inner flange portion 44 of the insulator 26 is larger than the radial thickness s2 of the outer flange portion 46. The radial distance from the radially inner end of the teeth 24b of the split core 24 to the coil winding portion 21 of the coil 18 is secured by the radial thickness s1 of the inner flange portion 44. Since the radial thickness s1 is large, the coil winding portion 21 is separated from the rotor of the rotating electrical machine radially outward (B1 side indicated by arrow B). As a result, as shown in FIG. 6, the amount of magnetic flux generated when the rotor 60 rotates through the coil 18 is reduced, and eddy current generated in the coil 18 can be reduced. Therefore, the temperature rise of the coil 18 due to the eddy current can be suppressed.

  If the coil winding portion 21 is separated from the rotor 60 of the rotating electrical machine to the outside in the radial direction (B1 side indicated by the arrow B) while maintaining the outer diameter of the stator 10 as before, the back yoke 24a of the split core 24 is Although the radial thickness is reduced, in this embodiment, the holder 12 is made of a ferromagnetic material. As described above, since the reduction in the radial thickness of the back yoke 24a is compensated by the holder 12, magnetic saturation due to the reduction in the radial thickness of the back yoke 24a is suppressed.

  Furthermore, since the magnetic permeability of the holder 12 is higher than the magnetic permeability of the split core 24, the difference (s 1 −s 2) between the radial thickness s 1 of the inner flange portion 44 and the radial thickness s 2 of the outer flange portion 46 is The radial thickness s1 of the inner flange portion 44 is set so as to be equal to or greater than the radial thickness t. That is, the radial thickness s1 of the inner flange portion 44 is set to “s2 + t + α” in a range that satisfies the condition of the above expression (2) while maintaining the outer diameter of the stator 10. As described above, when the radial thickness s1 of the inner flange portion 44 is large, the coil winding portion 21 of the coil 18 is further separated from the rotor 60 of the rotating electrical machine to the radially outer side (B1 side indicated by the arrow B). it can. Therefore, the generation of eddy currents in the coil can be further reduced without changing the outer diameter of the stator.

  In the present embodiment, the holder 12 is made of a ferromagnetic material, but only the annular portion 12b of the holder 12 may be made of a ferromagnetic material.

  Furthermore, in this embodiment, the insulator 26 is comprised with electrical insulation materials, such as resin which has flexibility. Moreover, as shown in FIG. 4, the insulator 26 is divided | segmented into two and shape | molded so that the teeth 24b of the division | segmentation core 24 may be inserted | pinched and integrated. The upper winding portion 38a and the lower winding portion 38b shown in FIG. 4 are formed to have a substantially U-shaped cross section, and particularly when the lower winding portion 38b contracts after molding, as shown in FIG. “Falling” occurs in which the opening width of the hole 48 for sandwiching 24b becomes narrow. When “falling” occurs, workability when inserting the teeth 24b into the holes 48 of the lower winding portion 38b is lowered. However, in this embodiment, since the radial thickness s1 of the inner flange portion 44 of the insulator 26 is large, the degree of “falling” due to contraction is small. As a result, workability when inserting the tooth 24b into the hole 48 of the lower winding part 38b is not deteriorated.

  Moreover, since the radial thickness s1 of the inner flange portion 44 of the insulator 26 is large, the strength including the thermal durability and the vibration durability is high, and the possibility of occurrence of cracks and the like affecting the insulating property in the inner flange portion 44 is reduced. it can.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. Although the inner rotor type rotating electrical machine has been described in the above embodiment, the present invention is also applicable to an outer rotor type rotating electrical machine.

DESCRIPTION OF SYMBOLS 10 Stator 12 Holder 12b Ring part 12c Flange part 14 Stator piece 16 Annular stator group 18 Coil 18a Winding 19 Coil end part 21 Coil winding part 24 Split core 24a Back yoke 24b Teeth 25 Stator core 26 Insulator (insulating member)
38 winding part 38a upper winding part 38b lower winding part 40 guide part 42 winding part main body 42a upper winding part main body 42b lower winding part main body 43 convex part 44 inner collar part 44a upper inner collar part 44b lower Side inner flange 45 Recess 46 Outer flange 46a Upper outer flange 46b Lower outer flange 48 Hole 50 Plate-like member 52 Conductive wire receiving portion 54 Terminal fixing portion 60 Rotor

Claims (2)

A stator core having a plurality of teeth arranged along the circumferential direction;
A coil wound around the teeth;
A stator for a rotating electrical machine, comprising: an insulating member that insulates the teeth and the coil;
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 a magnetic material having a higher magnetic permeability than the stator core ,
The insulating member is
A winding part body around which the winding of the coil is wound;
A first brim provided at a radially inner end of the wound body;
A second flange provided at a radially outer end of the wound body,
Of said first flange portion and the second flange portion, the radial thickness of the rotor and one of the flange portions facing is much larger than the radial thickness of the other flange,
The difference between the radial thickness of the first flange portion and said second flange portion in the radial direction thickness, not greater than the radial thickness of the holding member, the rotary electric machine stator. A stator for a rotating electrical machine according to claim 1 ,
The rotor is disposed radially inward of the rotating electrical machine;
The holding member is a stator of a rotating electrical machine that holds the stator core from a radially outer side.