JP2019080475A - Rotor of rotary electric machine - Google Patents

Abstract

To provide a rotor that reduces moment of inertia and improves an output of a rotary electric machine.SOLUTION: Each claw-shaped magnetic pole portion has a pair of chamfered portions including at an outer edge a first inclined surface, outer peripheral surface, and a part of an outer edge of a second inclined surface. A distance between a first point where one chamfered portion, the first inclined surface, and the outer peripheral surface intersect and a second point where the other chamfered portion, the first inclined surface, and the outer peripheral surface intersect is shorter than a distance between a third point where one chamfered portion, the outer peripheral surface, and the second inclined surface intersect and a fourth point where the other chamfered portion, the outer peripheral surface, and the second inclined surface intersect. A distance between a line connecting the third and fourth points of each first claw-shaped magnetic pole portion and a line connecting the third and fourth points of each second claw-shaped magnetic pole portion is shorter than a distance between a line connecting tips of the first claw-shaped magnetic pole portions and a line connecting tips of the second claw-shaped magnetic pole portions.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a rotor of a rotating electrical machine that constitutes an AC generator mounted on a vehicle.

  In order to efficiently transmit the output of the internal combustion engine of the vehicle to the wheels, it is effective to reduce the moment of inertia of the alternator connected by a belt or the like. When the moment of inertia of the alternator is reduced, the load applied to the internal combustion engine is reduced and the fuel consumption is improved. In order to reduce the moment of inertia of the alternator, it is better to make the rotor core smaller.

  However, if the rotor core is made smaller, there is a problem that the output of the AC generator is reduced. Therefore, conventionally, a rotor core shape capable of reducing the moment of inertia has been studied while suppressing the decrease in the output of the rotating machine (see, for example, Patent Document 1).

  Patent Document 1 discloses a so-called Lundell structure in which a pair of pole core bodies having a plurality of claw-like magnetic pole portions in the circumferential direction are combined with the plurality of claw-like magnetic pole portions alternately arranged in the circumferential direction. The rotor is described. And in patent document 1, each nail-shaped magnetic pole part of a rotor is chamfered. As a result, the circumferential distance between the claw-shaped magnetic pole portions on the radially outer side is secured large, and the magnetic flux leakage is reduced. Further, by increasing the area of the end face at the radial direction end, the amount of generated magnetic flux is increased to improve the output of the rotating electrical machine.

JP, 2016-220513, A

The prior art has the following problems.
In Patent Document 1, as shown in FIG. 7 of Patent Document 1, in one claw-shaped magnetic pole portion, a pair of chamfered portions 12d1 and a tapered surface radially outward from the radial direction on the root side of the claw The distance between two points at which the root portion 12e is crossed is L2. Further, a distance between two points where the pair of chamfered portions 12d2 and the outer peripheral surface 12c of the claw-like magnetic pole portion intersect is L1. And patent document 1 is setting the relationship of L2 and L1 to L2> L1. Thus, the amount of chamfering of the pair of chamfers 12d1 is reduced. For this reason, the rotor of Patent Document 1 has a small effect of reducing the moment of inertia.

  The present invention has been made to solve the above-described problems, and is intended to improve the effect of reducing the moment of inertia and obtain a rotor that improves the output of the rotating electrical machine.

  A rotor of a rotating electrical machine according to the present invention has a rotor core and a rotor winding, the rotor core has a first pole core body and a second pole core body, and the first pole core body has a circumferential direction. And the second pole core body has a plurality of second claw-shaped magnetic pole portions spaced from each other in the circumferential direction. The first pole core body and the second pole core body are combined with each other in a state in which the first claw-shaped magnetic pole portion and the second claw-shaped magnetic pole portion are alternately arranged in the circumferential direction. The plurality of first claw-shaped magnetic pole portions and the plurality of second claw-shaped magnetic pole portions disposed radially inward of the first claw-shaped magnetic pole portion and the plurality of second claw-shaped magnetic pole portions are circumferential directions of respective root shoulders. A chamfer is provided on both sides, and each chamfer includes a plurality of first claw-shaped magnetic pole portions and a plurality of second claws. The outer periphery of a part of the outer edge of the first inclined surface formed on the axially outer side of each root shoulder of the magnetic pole part, and the plurality of first claw-shaped magnetic pole parts and the plurality of second claw-shaped magnetic pole parts A part of the outer edge of the surface, and a part of the outer edge of the second inclined surface formed on both sides in the circumferential direction on the tip end side of the plurality of first claw-shaped magnetic pole parts and the plurality of second claw-shaped magnetic pole parts Is included in the outer edge, and in each of the first claw-shaped magnetic pole portions and each of the second claw-shaped magnetic pole portions, a first point where one chamfered portion, a first inclined surface, and an outer peripheral surface intersect, and the other chamfered portion The distance between the first inclined surface and the second point at which the outer peripheral surface intersects is one chamfered portion, a third point at which the outer peripheral surface intersects the second inclined surface, and the other chamfered portion, It is smaller than the distance between the outer circumferential surface and the fourth point where the second inclined surface intersects.

  According to the present invention, the chamfered portions on both sides in the circumferential direction are enlarged on the root shoulder side of each claw-shaped magnetic pole portion. Thereby, the moment of inertia of the rotor can be reduced, and the output of the rotating electrical machine can be improved.

FIG. 1 is a cross-sectional view schematically showing a rotating electrical machine in which a rotor of Embodiment 1 is incorporated. FIG. 1 is a perspective view showing a rotor of a rotary electric machine of a first embodiment. FIG. 1 is a perspective view showing a pole core body that constitutes a rotor of a rotary electric machine of a first embodiment. FIG. 6 is a front view showing a claw-shaped magnetic pole portion of each pole core body that constitutes a rotor of the rotary electric machine of the first embodiment. It is a figure explaining the shape of the chamfer of each nail-like magnetic pole part of FIG. FIG. 5 is a diagram showing the positional relationship of each pole core body that constitutes the rotor of the rotary electric machine of the first embodiment. It is the figure which compared the improvement effect of the induction voltage fundamental wave component of the rotary electric machine using the rotor of Embodiment 1 with a prior art example. It is the figure which compared the reduction effect of the moment of inertia of the rotary electric machine using the rotor of Embodiment 1 with a prior art example. FIG. 7 is a view showing a relationship between a claw-shaped magnetic pole portion of a pole core body and a stator, which constitute a rotor of the rotary electric machine of the first embodiment. FIG. 7 is a diagram showing the relationship between the claw-shaped magnetic pole portion of the pole core body and the other stator that constitutes the rotor of the rotary electric machine of the first embodiment.

  Hereinafter, a preferred embodiment of a rotor of a rotating electrical machine of the present invention will be described using the drawings.

Embodiment 1
FIG. 1 is a front view of a vehicular AC generator-motor as a rotating electric machine incorporating a rotor according to a first embodiment of the present invention. In addition, FIG. 1 is the state which removed the cover of the control apparatus. FIG. 2 is a perspective view showing a rotor of the rotary electric machine according to the first embodiment. The double arrows shown in FIG. 1 indicate the axial direction of the rotary electric machine 100 and indicate the front F side and the rear R side.

  The rotary electric machine 100 has a cylindrical stator 2, a rotor 1 disposed inside the stator 2, and a case for supporting the stator 2 and the rotor 1. The case has a front bracket 4A for holding the front F side of the stator 2 and a rear bracket 4B for holding the rear R side. The front bracket 4A and the rear bracket 4B are fixed by a plurality of bolts. The front bracket 4A and the rear bracket 4B are formed of aluminum.

  The rotor 1 has a shaft 6. The shaft 6 is rotatably supported by bearings 7 attached to the front bracket 4A and the rear bracket 4B. On the front F side of the shaft 6, a pulley 5 on which a belt (not shown) is wound is fixed. Near the center of the shaft 6, the rotor 1 is fixed. Fans 9 are attached to both sides of the rotor 1 respectively. On the rear R side of the shaft 6, a slip ring 8 for supplying an electric current to the rotor 1 and a brush (not shown) disposed so as to slide on the slip ring 8 are attached.

  A fixed air gap is formed between the outer periphery of the rotor 1 and the inner periphery of the stator 2. The rotor 1 has a field winding 30 through which a field current flows to generate a magnetic flux. The stator 2 has a stator coil 3 which receives a magnetic flux from the field winding 30 as the rotor 1 rotates.

  The operation as a motor of the vehicle AC generator-motor as the rotary electric machine 100 configured as described above will be described. When the engine is started, DC power is supplied from the battery (not shown) to the power circuit unit via the power supply terminal. The control circuit unit turns on / off each switching element of the power circuit unit to convert direct current power into alternating current power. This AC power is supplied to the stator coil 3 of the stator 2.

  On the other hand, the field circuit unit supplies a field current to the field winding 30 of the rotor 1 through the brush and the slip ring 8 based on a command from the control circuit unit to generate a magnetic flux. By this magnetic flux, the first claw-shaped magnetic pole portion 10E of the first pole core body 10 is magnetized to the N pole, and the second claw-shaped magnetic pole portion 20E of the second pole core body 20 is magnetized to the S pole.

  The linkage between the magnetic flux of the rotor 1 and the current flowing through the stator coil 3 generates a drive torque. The rotor 1 is rotationally driven by this driving torque. Then, the rotational torque of the rotor 1 is transmitted from the pulley 5 to the crankshaft of the engine via a belt (not shown) to start the engine.

  Next, the operation of the automotive alternator motor as a generator will be described. When the engine is in operation, rotational torque of the engine is transmitted from the crankshaft to the shaft 6 through the belt and pulley 5 to rotate the rotor 1. Thereby, the magnetic flux generated by the field winding 30 interlinks with the stator coil 3 of the stator 2, and a three-phase AC voltage is induced in the stator coil 3. Then, the control circuit unit performs ON / OFF control of each switching element of the power circuit unit to convert the three-phase AC voltage induced in the stator coil 3 into DC power and charge the battery.

  As shown in FIG. 2, the rotor 1 is disposed to cover the field winding 30. The rotor 1 has a first pole core body 10 and a second pole core body 20 in which magnetic poles are formed by the magnetic flux of the field winding 30. The first pole core body 10 and the second pole core body 20 are each formed of a low carbon steel such as S10C by a cold forging method.

  FIG. 3 is a view showing the first pole core body 10. As shown in FIG. 3, the first pole core body 10 is a cylindrical body having an annular end face. The first pole core body 10 has a first boss portion 10A in which a through hole for inserting the shaft 6 is formed. In addition, the first pole core body 10 has eight first yoke portions 10B that are extended at the same pitch radially outward from the rear R side of the first boss portion 10A. Then, on the outer peripheral side of each first yoke portion 10B, a first claw-shaped magnetic pole portion 10E extending to the front F side through the root shoulder portion 10C is formed. In addition, although only the 1st pole core body 10 is shown in FIG. 3, the shape of the 2nd pole core body 20 is also the same. The first pole core body 10 and the second pole core body 20 differ only in that the mounting directions to the shaft 6 are reversed.

  FIG. 4 shows one first claw-shaped magnetic pole portion 10E of the first pole core body 10 and one second claw-shaped magnetic pole portion 20E of the second pole core body 20. As shown in FIGS. 3 and 4, the outer circumferential surfaces of the first claw-shaped magnetic pole portions 10E and the second claw-shaped magnetic pole portions 20E are formed in a substantially trapezoidal shape. Note that RD indicated by a double arrow in FIG. 4 indicates the circumferential direction of the rotor 1.

  The width in the circumferential direction of each first claw-shaped magnetic pole portion 10E and each second claw-shaped magnetic pole portion 20E narrows toward the tip end side. Further, each of the first claw-shaped magnetic pole portions 10E and each of the second claw-shaped magnetic pole portions 20E is formed in a tapered shape in which the thickness in the radial direction becomes thinner toward the tip end side.

  Each first claw-shaped magnetic pole portion 10E has chamfers 15 and 16 on both side surfaces in the circumferential direction of the root shoulder portion 10C. Similarly, each second claw-shaped magnetic pole portion 20E has chamfers 25 and 26 on both side surfaces in the circumferential direction of the root shoulder portion 20C.

  FIG. 5 is a view for explaining the shapes of the two chamfers 15 and 16 in one first claw-shaped magnetic pole part 10E. The two chamfers 25 and 26 of the second claw-shaped magnetic pole portions 20E are the same as the chamfered portions 15 and 16 of the first claw-shaped magnetic pole portion 10E.

  As shown in FIG. 5, the chamfered portion 15 of each first claw-shaped magnetic pole portion 10E is a part of the outer edge of the first inclined surface 12 formed on the rear R side of the root shoulder 10C and the outer edge of the outer peripheral surface 11. And a part of the outer edge of the second inclined surface 13 formed in one of the circumferential directions on the front F side.

  On the other hand, the chamfered portion 16 of each first claw-shaped magnetic pole portion 10E is a part of the outer edge of the first inclined surface 12 formed on the rear R side of the root shoulder 10C and a part of the outer edge of the outer peripheral surface 11; A part of the outer edge of the second inclined surface 14 formed on the other of the circumferential direction on the front F side is formed to include the outer edge.

  Here, in each of the first claw-shaped magnetic pole portions 10E, a point at which one chamfered portion 15, the first inclined surface 12, and the outer peripheral surface 11 intersect is referred to as a first point X11. Further, a point at which the other chamfered portion 16, the first inclined surface 12, and the outer peripheral surface 11 intersect is referred to as a second point X12.

  Then, a point at which one chamfered portion 15 in each first claw-shaped magnetic pole portion 10E intersects the outer peripheral surface 11 and the second inclined surface 13 is referred to as a third point Y11. Further, a point at which the other chamfered portion 16, the outer peripheral surface 11, and the second inclined surface 14 intersect is referred to as a fourth point Y12. At this time, the distance Wx between the first point X11 and the second point X12 is smaller than the distance Wy between the third point Y11 and the fourth point Y12.

  FIG. 6 shows a pair of adjacent first claw-shaped magnetic pole portions 10E and second claw-shaped magnetic pole portions 20E. As shown in FIG. 6, the line connecting the third point Y11 and the fourth point Y12 of each first claw-shaped magnetic pole portion 10E, and the third point Y21 and fourth of each second claw-shaped magnetic pole portion 20E. The distance between the point Y22 and the line connecting the point Y22 is Ly. The distance between the line connecting the tip end portions 17 of the first claw-shaped magnetic pole portions 10E and the line connecting the tip end portions 27 of the second claw-shaped magnetic pole portions is Ld. At this time, the distance Ly is formed to be smaller than the distance Ld.

  Next, the effect confirmation result of the rotor of the rotary electric machine of the first embodiment will be described using FIGS. 7 and 8.

  FIG. 7 is a diagram showing the result of measuring the magnitude of the fundamental wave component of the stator induced voltage. Moreover, FIG. 8 is a figure which shows the result of having measured the magnitude | size of the reduction effect of a rotor inertia moment. In FIG. 7 and FIG. 8, the measured value using the rotor of the comparative example is indicated by C, and the measured value using the rotor 1 of the first embodiment is indicated by A. Moreover, the vertical axis | shaft of FIG.7 and FIG.8 has shown the ratio which set the measured value of the comparative example to one.

  In the comparison of the magnitude of the fundamental wave component of the stator induced voltage in FIG. 7, a rotor formed so that the distance Ld in FIG. 6 is smaller than the distance Ly is used as a comparative example. Further, in the comparison of the reduction effect of the moment of inertia in FIG. 8, as the comparative example, each first claw-shaped magnetic pole portion 10E does not have the chamfered portions 15, 16, and the second claw-shaped magnetic pole portion 20E is chamfered A rotor without 25 and 26 was used.

  As shown in FIG. 7, in A using the rotor 1 of Embodiment 1, the fundamental wave component of the voltage induced in the stator 2 is improved more than the measured value C using the rotor of the comparative example. There is. This is because the magnetic resistance between the adjacent first claw-shaped magnetic pole portion 10E and the second claw-shaped magnetic pole portion 20E is increased by setting the distance Ly smaller than the distance Ld, and the magnetic flux interlinked with the stator 2 It is due to the increase in quantity.

  Further, as shown in FIG. 8, A using the rotor 1 according to the first embodiment improves the reduction effect of the rotor inertia moment more than the measured value C using the rotor of the comparative example. This is because the chamfering amounts of the first claw-shaped magnetic pole portion 10E and the second claw-shaped magnetic pole portion 20E are large.

  As described above, according to the rotor of the rotary electric machine of the first embodiment, the chamfered portions 15 and 16 are provided on both circumferential side portions of the root shoulder portion 10C of the plurality of first claw-shaped magnetic pole portions 10E. Further, chamfered portions 25 and 26 are provided on both sides in the circumferential direction of the root shoulder portion 20C of the plurality of second claw-shaped magnetic pole portions 20E.

  And the chamfers 15 and 16 of each 1st nail-like magnetic pole part 10E are formed as follows. That is, a distance between a first point X11 where the chamfered portion 15, the first inclined surface 12 and the outer peripheral surface 11 intersect, and a second point X12 where the chamfered portion 16, the first inclined surface 12 and the outer peripheral surface 11 intersect The distance between the third point Y11 where the chamfered portion 15, the outer peripheral surface 11 and the second inclined surface 13 intersect, and the fourth point Y12 where the chamfered portion 16, the outer peripheral surface 11, and the second inclined surface 14 intersect If Wy, then Wx <Wy. The chamfers 25 and 26 of each second claw-shaped magnetic pole portion 20E are similarly formed.

  Furthermore, a line connecting the third point Y11 and the fourth point Y12 of the first claw-shaped magnetic pole portion 10E and a line connecting the third point Y21 and the fourth point Y22 of the second claw-shaped magnetic pole portion 20E And the distance between the line connecting the tips 17 of the first claw-shaped magnetic pole portions 10E and the line connecting the tips 27 of the second claw-shaped magnetic pole portions 20E is Ld. <Ld.

  Thereby, the first claw-shaped magnetic pole portions 10E and the second claw-shaped magnetic pole portions 20E increase the chamfering amounts of the chamfered portions 15 and 16 and the chamfered portions 25 and 26, and Wx <Wy and Ly <Ld. It is formed to have a relationship of As a result, the moment of inertia of the rotor can be reduced, and the fundamental wave magnetic flux linking the stator 2 can be improved, and the output of the rotary electric machine 100 can be improved.

Second Embodiment
FIG. 9 is a view showing the positional relationship between the first claw-shaped magnetic pole portion 10E, the second claw-shaped magnetic pole portion 20E, and the stator 2 which form the rotor 1 of the second embodiment. The first claw-shaped magnetic pole portion 10E and the second claw-shaped magnetic pole portion 20E of the second embodiment are different from the first embodiment in that the positional relationship with the stator 2 is defined. The other configuration is the same as that of the first embodiment.

  As shown in FIG. 9, in the rotor 1 of the second embodiment, a line connecting the third point Y11 and the fourth point Y12 of the first claw pole portion 10E and the second claw pole portion 20E The distance Ly between the third point Y21 and the line connecting the fourth point Y22 is smaller than the axial width Lsc of the stator 2.

  According to the rotor 1 of the second embodiment, the first claw pole portion 10E and the first claw pole portion 10E adjacent to each other on the outer peripheral surface 11 of the first claw pole portion 10E and the outer peripheral surface 21 of the second claw pole portion 20E. The region where the magnetic resistance between the two-pole magnetic pole portion 20E is increased is a surface facing the stator in the radial direction. For this reason, the rotor 1 according to the second embodiment can obtain a higher fundamental wave magnetic flux improvement effect by setting Ly <Lsc.

  FIG. 10 is a view showing a modification of the second embodiment. The positional relationship between the first claw-shaped magnetic pole portion 10E and the second claw-shaped magnetic pole portion 20E of the modification in FIG. 10 with respect to the stator 2 is different from that in the case of FIG.

  As shown in FIG. 10, in the modified example, the distance Ld between the line connecting the end portions 17 of the first claw-shaped magnetic pole portions and the line connecting the end portions 27 of the second claw-shaped magnetic pole portions is the stator 2 Is made smaller than the axial width Lsc of

  According to the modification of the second embodiment, by setting Ld <Lsc, the first outer circumferential surface 11 of the first claw pole portion 10E and the first outer circumferential surface 21 of the second claw pole portion 20E are adjacent to each other. The region where the magnetic resistance between the claw-shaped magnetic pole portion 10E and the second claw-shaped magnetic pole portion 20E is increased is the surface facing the stator 2 in the radial direction. For this reason, the rotor shown in FIG. 10 can enhance the fundamental magnetic flux improvement effect more than the rotor shown in FIG.

  DESCRIPTION OF SYMBOLS 1 rotor, 2 stators, 3 stator coils, 6 shafts, 10 1st pole core body, 10C, 20C root shoulder, 10E 1st claw-like magnetic pole part, 11, 21 outer peripheral surface, 12, 22 1st inclined surface 13, 14, 23, 24 second inclined surface, 15, 16, 25, 26 chamfered portion, 17, 27 tip portion, 20 second pole core body, 20 E second claw-like magnetic pole portion, 30 field winding, 100 Electric rotating machine.

Claims (4)

It has a rotor core and a rotor winding,
The rotor core has a first pole core body and a second pole core body,
The first pole core body has a plurality of first claw-shaped magnetic pole portions spaced from each other in the circumferential direction,
The second pole core body has a plurality of second claw-like magnetic pole portions spaced from each other in the circumferential direction,
The first pole core body and the second pole core body are combined with each other in a state where the first claw-shaped magnetic pole portion and the second claw-shaped magnetic pole portion are alternately arranged in the circumferential direction,
In the rotor of a rotating electrical machine, the rotor winding is disposed radially inward of the plurality of first claw-shaped magnetic pole portions and the plurality of second claw-shaped magnetic pole portions.
Each of the plurality of first claw-shaped magnetic pole portions and the plurality of second claw-shaped magnetic pole portions has chamfers on both sides in the circumferential direction of the root shoulder,
Each said chamfer is
A part of the outer edge of the first inclined surface formed on the axially outer side of the root shoulder of each of the plurality of first claw-shaped magnetic pole portions and the plurality of second claw-shaped magnetic pole portions;
A part of the outer edge of each of the outer peripheral surfaces of the plurality of first claw-shaped magnetic pole portions and the plurality of second claw-shaped magnetic pole portions;
The outer edge includes a part of an outer edge of a second inclined surface formed on both end sides of each of the plurality of first claw-shaped magnetic pole parts and the plurality of second claw-shaped magnetic pole parts on the tip side.
A first point at which one of the chamfered portions, the first inclined surface, and the outer peripheral surface of each of the first claw-shaped magnetic pole portions and each of the second claw-shaped magnetic pole portions intersect, and the other chamfered portion A distance Wx between the first inclined surface and a second point where the outer peripheral surface intersects is a third point where one of the chamfered portion, the outer peripheral surface, and the second inclined surface intersects. Smaller than a distance Wy between the other chamfered portion, a fourth point where the outer peripheral surface and the second inclined surface intersect,
A line connecting the third point and the fourth point of each of the first claw-shaped magnetic pole portions, and the third point and the fourth point of each of the second claw-shaped magnetic pole portions The distance Ly from the connecting line is smaller than the distance Ld between the line connecting the tips of the first claw-shaped magnetic pole parts and the line connecting the tips of the second claw-shaped magnetic pole parts
Rotor of rotating electric machine. The distance Ly is smaller than the axial width Lsc of the stator,
The rotor of the rotary electric machine according to claim 1. The distance Ld is smaller than the axial width Lsc of the stator,
The rotor of the rotary electric machine according to claim 1. Each chamfered portion of each of the first claw-shaped magnetic pole portions and each of the second claw-shaped magnetic pole portions corresponds to an axial center line of each of the first claw-shaped magnetic pole portions and each of the second claw-shaped magnetic pole portions. It has a symmetrical shape,
The rotor of the rotary electric machine according to any one of claims 1 to 3.

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