JP5253599B1 - Resolver and rotating electric machine for vehicle - Google Patents

Abstract

In a conventional technique, an inner magnetic bypass member close to a rotor core among magnetic bypasses sandwiching a rotation angle detector is fixed to a side wall of a housing, and a gap is formed between the rotary shaft and a rotary shaft. The outer magnetic bypass member fixed to the shaft end of the rotating shaft is attached to a retainer made of a non-magnetic material. Any magnetic bypass member provided in the vicinity of the magnetic rotation angle detector cannot sufficiently bypass the leakage magnetic flux, and there is a limit to increasing the rotation angle detection accuracy.
A resolver rotor comprising: a resolver stator having an output coil and an exciting coil; and a resolver rotor having a concavo-convex outer peripheral surface facing the inner peripheral surface of the resolver stator with a gap therebetween and attached to a rotary shaft. In this, a leakage flux shielding long hole is provided along the outer peripheral surface of the rotating shaft, and the number of leakage flux shielding long holes is made different from the number of poles of the resolver rotor.
[Selection] Figure 2

Description

  The present invention relates to a resolver that is a rotation angle detector, and a rotating electrical machine for a vehicle that includes the resolver.

In general, a rotating electrical machine for a vehicle is used as a synchronous motor when the engine is started, and as an AC generator while the engine is operating. When used as a synchronous motor when starting the engine, it is necessary to control the energization timing to the coils wound around the stator core and the rotor core. Therefore, a rotation angle detector is arranged on the rotation shaft on which the rotor core is mounted so as to detect the rotation angle of the rotation shaft.
Here, when using a change in magnetism as the rotation angle detector, for example, a resolver or a Hall element, a part of the magnetic flux generated by energizing the rotor coil wound around the rotor core is passed through the rotation shaft. There is a risk of leaking into the rotation angle detector and lowering the angle detection accuracy.
For example, when a resolver is used as the rotation angle detector, the resolver detects the resolver rotor angle by using the magnetic permeance change between the resolver stator and the resolver rotor. There is a problem that noise components are superimposed on the rotation angle and the accuracy of rotation angle detection is reduced.
Therefore, in the prior art, a magnetic permeability member with a high magnetic permeability is provided in a state where the magnetic rotation angle detector is sandwiched back and forth along the axial direction, and leakage magnetic flux flowing through the rotation shaft is routed through these magnetic bypass members. Thus, Patent Document 1 proposes a configuration in which leakage magnetic flux does not flow through the rotation angle detector.
With the configuration described in Patent Document 1, the leakage magnetic flux passing through the magnetic rotation angle detector is reduced, so that the rotation angle detection accuracy can be improved.

Japanese Patent No. 3557386

However, in the prior art described in Patent Document 1, among the magnetic bypasses sandwiching the rotation angle detector, the inner magnetic bypass member close to the rotor core is fixed to the side wall of the housing, and between the rotation shafts. There is a gap. For this reason, the effect of bypassing the leakage magnetic flux flowing through the rotating shaft by this magnetic bypass is insufficient.
The outer magnetic bypass member fixed to the shaft end of the rotating shaft is attached to a retainer made of a non-magnetic material. Therefore, the effect of bypassing the leakage magnetic flux is not sufficient even by the magnetic bypass member attached to the retainer.

As described above, in the prior art, any magnetic bypass member provided in the vicinity of the magnetic rotation angle detector cannot sufficiently bypass the leakage magnetic flux, so that the rotation angle detection accuracy can be improved. There is a limit.
The present invention has been made to solve the above-described problem, and provides a resolver capable of reducing the influence of leakage magnetic flux from a rotating shaft and detecting a rotation angle with high accuracy, and a rotating electrical machine for a vehicle incorporating the same. The purpose is to provide.

  A resolver according to the present invention includes a resolver stator having an output coil and an exciting coil, and a resolver rotor having an uneven outer peripheral surface facing the inner peripheral surface of the resolver stator with a gap therebetween and attached to a rotating shaft. The resolver rotor is provided with a leakage flux shielding elongated hole along the outer peripheral surface of the rotating shaft, and the number of the leakage flux shielding elongated holes is different from the number of poles of the resolver rotor. is there.

  According to the resolver of the present invention, for example, a part of the magnetic flux generated in the vehicular rotating electrical machine leaks to the resolver through the rotating shaft, but the leakage flux is shielded by providing the resolver rotor with a leakage flux shielding long hole. In addition, since the number of leakage flux shielding long holes is different from the number of poles of the resolver rotor, the number of bridge portions formed between the leakage flux shielding long holes and the number of poles of the resolver rotor are the same. Since the number of poles of the magnetic flux leakage becomes equal to the number of poles of the resolver rotor, it can prevent the phenomenon that it becomes a noise component and lowers the angle detection accuracy. .

It is sectional drawing which shows the structure of the rotary electric machine for vehicles which concerns on Embodiment 1 of this invention. It is a front view of the resolver which concerns on Embodiment 1 of this invention. It is a front view of the resolver rotor which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the structure of the rotary electric machine for vehicles which concerns on Embodiment 2 of this invention. It is the front view of the resolver which shows the flow of the magnetic flux in the conventional rotary electric machine for vehicles of the same type as the rotary electric machine for vehicles concerning Embodiment 2 of this invention. It is a front sectional view showing the flow of magnetic flux in the resolver part of the rotating electrical machine for a vehicle related to Embodiment 2 of this invention. It is explanatory drawing for demonstrating the resolver rotor which concerns on Embodiment 3 of this invention. It is a front view of the resolver rotor which concerns on Embodiment 3 of this invention. It is a front view of the resolver rotor which concerns on Embodiment 4 of this invention. It is a front view of the modification of the resolver rotor which concerns on Embodiment 4 of this invention. It is explanatory drawing of the prior art example in demonstrating the resolver rotor which concerns on Embodiment 5 of this invention. It is a front view of the resolver rotor which concerns on Embodiment 5 of this invention. It is a front view of the resolver rotor which concerns on Embodiment 6 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In addition, the same code | symbol shows the same or an equivalent part between each figure.

Embodiment 1 FIG.
The first embodiment will be described below with reference to FIGS.
1 is a cross-sectional view showing a configuration of a rotating electrical machine for a vehicle incorporating a resolver according to Embodiment 1 of the present invention.
In FIG. 1, reference numeral 2 denotes a housing, which is configured by fixing a pair of left and right brackets 3 and 4 with bolts 5. At this time, the stator core 24 is sandwiched and fixed between the brackets 3 and 4.
Reference numeral 7 denotes a rotating shaft, and 8 and 9 denote bearings that rotatably support the rotating shaft 7 on the housing 2, and these bearings 8 and 9 are attached to the brackets 3 and 4, respectively. Reference numeral 10 denotes a pulley on which a belt (not shown) is suspended, and this pulley 10 is fixed to the rotary shaft 7 by a nut 11.
The rotor core 12 is configured by integrating a pair of core members 16 and 17, and is press-fitted and fixed to the rotary shaft 7. Each of the core members 16 and 17 has claw-shaped magnetic pole portions 16b and 17b extending from the cylindrical portions 16a and 17a in which the bobbin around which the rotor coil 13 is wound is accommodated to the position where they cover the rotor coil 13 and intersect each other. Each is extended. The claw-shaped magnetic pole portions 16b and 17b have a shape arranged at a constant pitch with a predetermined interval along the circumferential direction.
Cooling fans 18 and 19 are attached to the axial end surfaces of the core members 16 and 17, respectively.

A stator coil 25 is wound around the stator core 24, and the stator coil 25 is connected to a three-phase inverter circuit (not shown). A brush 26 is in contact with the slip ring 22 to form an energization path. The slip ring 22 is fixed to the rotary shaft 7.
A pulley 10 is attached to one shaft end of the rotating shaft 7, and a resolver 31 as a rotation angle detector of the rotating shaft 7 is disposed on the opposite shaft end.
The resolver 31 includes a resolver stator 34 having an output coil and an excitation coil, and a resolver rotor 32 having an uneven outer peripheral surface facing the inner peripheral surface of the resolver stator 34 with a gap therebetween, and the resolver rotor 32 rotates. The resolver stator 34 is fixed to the bracket 3, and a resolver coil 34 a is wound around the shaft end of the shaft 7.
The above configuration is already known, and detailed description is omitted.

In the conventional rotating electrical machine, the coil disposed so as to surround the rotating shaft 7 is only the rotor coil 13, and a field current is supplied to the rotor coil 13 via the brush 26 and the slip ring 22 to cause the rotor core 12 to flow. Magnetized.
Most of the magnetic flux generated by applying a field current to the rotor coil 13 follows a path A flowing from the rotor to the stator as shown in FIG. 1, but a part thereof passes through the rotating shaft 7 which is a ferromagnetic material. It leaks to the resolver 31 through the path B. When this leakage magnetic flux flows into the resolver stator 34, a noise voltage component is induced in the resolver coil 34a by the magnetic flux and is superimposed on the signal component, so that there is a problem that the angle detection accuracy is lowered.

Therefore, in the first embodiment, as shown in FIG. 2, a leakage flux shielding long hole 101 is provided around the rotating shaft mounting hole 102 provided at the center of the resolver rotor 32, and the leakage flux shielding long hole 101 is provided. The number of was different from the number of poles of the resolver rotor 32.
FIG. 2 shows an example in which the number of poles of the resolver rotor 32 is six and the number of leakage magnetic flux shielding long holes 101 is four, and the combination is not limited to this. Since the leakage flux shielding long hole 101 is a gap and has a large magnetic resistance, the magnetic flux leaking from the rotating shaft 7 to the resolver 31 is greatly reduced by the leakage magnetic flux shielding long hole 101, and the outer periphery of the resolver rotor 32 It becomes difficult to flow into the resolver stator 34.
As a result, a noise component generated by the leakage magnetic flux is reduced, and a decrease in the angle detection accuracy of the resolver can be prevented.

Next, the effect of setting the number of leakage flux shielding long holes 101 to be different from the number of poles of the resolver rotor 32 will be described.
In terms of the effect of shielding the leakage magnetic flux, it is desirable that the leakage flux shielding long hole 101 has an annular shape and magnetically separates the inner and outer circumferences of the resolver rotor 32. However, since the complete annular shape cannot support the outer peripheral side of the resolver rotor 32, at least one or more bridge portions 103 that connect the inner and outer periphery are required. Therefore, as shown by an arrow S in FIG. 3, leakage magnetic flux flows through the bridge portion 103 to the outer peripheral portion of the resolver rotor 32 and the resolver stator 34 shown in FIG.
At this time, since the leakage magnetic flux flowing through the bridge portion 103 to the outer peripheral portion of the resolver rotor 32 and the resolver stator 34 is larger than the location where the leakage flux shielding long hole 101 is disposed, the number of the bridge portions 103 is increased. The leakage magnetic flux S flows in the outer peripheral portion of the resolver rotor 32 with the corresponding number of poles.

The resolver 31 is configured to detect the magnetic flux distribution of the number of poles of the resolver rotor 32 and cancel the magnetic flux distribution of the other number of poles. Further, the frequency component of the angle signal of the voltage induced in the resolver coil 34a depends on the number of poles of the resolver rotor 32, and the frequency component of the noise signal generated by the magnetic flux having the number of poles other than the number of rotor poles is filtered by a frequency filter. It can be reduced by using it.
However, if the number of bridge portions 103 is the same as the number of poles of the resolver rotor 32, the number of poles of the leakage magnetic flux becomes equal to the number of poles of the resolver rotor 32 and becomes a noise component, so that the angle detection accuracy is lowered.
Therefore, if the number of leakage flux shielding long holes 101 (four in this case) is different from the number of poles of the resolver rotor 32 (six in this case) as shown in FIG. The number of poles of the resolver rotor 32 can be made different, and as a result, the influence of leakage magnetic flux that becomes a noise component can be reduced.

  In general, the core of the resolver stator 34 and the core of the resolver rotor 32 having an air gap in the radial direction are configured by stacking thin steel plates. This is to prevent eddy currents from being generated in the core and causing loss, and at this time, each thin plate constituting the core is often processed by pressing. The leakage flux shielding long hole 101 of the first embodiment can be formed at the same time as the thin plate is pressed, and no separate parts other than the iron core material are required. Costs will not increase.

Embodiment 2. FIG.
FIG. 1 shows an example of an outer type in which a resolver 31 is disposed at the outermost end portion of the rotating shaft 7. A slip ring 22, a bearing 8, and a rotor core are sequentially arranged on the rotating shaft 7 from the resolver rotor 32 at the shaft end. 12 is arranged. These are members necessary for constituting the vehicular rotating electrical machine, but the arrangement is not limited to this order. For example, the arrangement of the slip ring 22, the resolver 31, the bearing 8, the rotor core, the bearing 8, the slip ring 22 is provided. An inner type arrangement such as a resolver 31 or a rotor core is also possible.

FIG. 4 is a cross-sectional view showing the configuration of a vehicular rotating electrical machine incorporating a resolver according to Embodiment 2 of the present invention. From the shaft end of the rotating shaft 7, the bearing 8, the slip ring 22, the resolver 31, and the rotor core 12 are arranged in this order. It is an example of the arranged inner type.
Hereinafter, the resolver rotor according to the second embodiment will be described with reference to FIGS.
In FIG. 4, the slip ring 22 is a component for supplying electric power to the rotor coil 13 disposed in the rotor core 12, so that at least an electric current is passed between the slip ring 22 and the coil terminal of the rotor coil 13. Two conductors 35 are wired. In FIG. 4, the current flowing through the conductor 35 is indicated by an arrow C. Although only one is visible in FIG. 4, at least two conductors are arranged.
As shown in FIG. 4, when the resolver 31 is disposed on the rotating shaft 7 between the slip ring 22 and the rotor core 12, the conductor is disposed along the axial direction of the rotating shaft 7 on the inner peripheral portion of the resolver rotor 32. As shown in FIGS. 5 and 6, 35 is wired in a wiring groove 7 a formed in the axial direction of the rotary shaft 7.

FIG. 5 is a cross-sectional view of a conventional vehicular rotating electrical machine in which a conductor 35 is disposed on the inner periphery of the resolver rotor 32.
In the conventional vehicular rotating electrical machine shown in FIG. 5, two conductors 35 wired in the wiring groove 7 a are arranged in parallel to the rotation axis and pass through the rotation shaft mounting hole 102. In the figure, a current flows in the conductor on the right side of the drawing toward the back of the page and on the left side in front of the page. When the conductor 35 is arranged in such a manner, when the rotor coil 13 is energized and a current flows through the conductor 35, a magnetic field that circulates around the conductor 35 is generated based on Ampere's law. For this reason, magnetic flux that flows in the resolver rotor 32 as indicated by arrow D and magnetic flux that passes through the resolver stator 34 as indicated by arrow E are generated. These magnetic fluxes induce noise components in the resolver coil 34a.

The leakage flux shielding long hole 101 of the second embodiment also works effectively against such leakage flux.
FIG. 6 is a front sectional view when the conductor 35 is arranged on the inner peripheral portion of the resolver rotor 32 provided with the leakage flux shielding long hole 101.
In FIG. 6, the leakage flux shielding long hole 101 has a large magnetic resistance, so that it is difficult for the magnetic flux to flow through the paths as indicated by arrows D and E shown in FIG. 5. A magnetic flux flows as shown by an arrow F inside 101. However, the magnetic flux component generated by the excitation winding and contributing to the angle detection in the VR resolver passes through the outer periphery of the resolver rotor 32 as indicated by the arrow G. For this reason, even if leakage magnetic flux flows in the inner periphery of the resolver rotor 32, the angle detection accuracy is not affected.
As described above, the leakage flux shielding long hole 101 is not limited to the leakage magnetic flux flowing in from the rotor coil 13 via the rotating shaft 7 but also the magnetic flux caused by the current flowing in the conductor 35 disposed in the axial direction inside the resolver rotor 32. The influence can also be effectively reduced.

  In FIG. 6, two conductors 35 are arranged inside the resolver rotor 32, and the conductor 35 on the right side in FIG. 6 is energized in the back direction toward the paper surface, and the left conductor 35 is energized in the front direction. However, the arrangement is not limited to the form of FIG. 6 as long as it is a pair of conductors. The effects of the second embodiment can be obtained in the same manner even when the center angle of the two conductors 35 is other than 180 degrees, or when two conductors 35 are disposed.

Embodiment 3 FIG.
As shown in the embodiments so far, in the bridge portion 103 between the leakage flux shielding long holes 101, there is a magnetic flux leaking via the rotating shaft 7.
As in the first embodiment, by setting the number of poles of the resolver rotor 32 and the leakage flux shielding long holes 101 to different numbers, the influence of the leakage flux can be reduced. However, even when the leakage flux shielding long holes 101 are provided in a number different from the number of poles of the resolver rotor 32, the effect of suppressing the reduction in angle detection accuracy differs depending on the number of leakage flux shielding long holes 101.

First, a description will be given of a case where the number of leakage flux shielding long holes 101 is set to a divisor of the number of poles of the resolver rotor 32.
FIG. 7 shows a resolver rotor 32 in which the number of leakage flux shielding long holes 101 is three and the number of poles of the resolver rotor 32 is six. In this case, the magnetic flux R leaking via the rotating shaft 7 is three poles. Since the second harmonic component is six poles, if a harmonic is generated, a six-pole magnetic flux is generated, which coincides with the number of poles of the resolver rotor 32 and induces a noise component in the resolver coil 34a.

Next, a description will be given of a case where the number of leakage flux shielding long holes 101 is set to a multiple of the number of poles of the resolver rotor 32.
FIG. 8 shows a resolver rotor 32 in which the number of leakage flux shielding long holes 101 is six and the number of poles of the resolver rotor 32 is three.
In this case, since the number of bridge portions 103 is six, there is a magnetic flux leaking from six locations via the rotary shaft 7, but the directions of arrows R1, R3, and R5 in FIG. 8 indicate the radius of the core of the resolver rotor 32. Since the thickness in the direction is thick and the thickness in the directions R2, R4, and R6 is thin, the magnetic resistance is different. Therefore, since the magnitude of the flowing magnetic flux is different in the R1, R3, R5 direction and the R2, R4, R6 direction, a three-pole magnetic flux is generated. As a result, the number of poles of the resolver rotor 32 coincides with the noise, and a noise component is induced in the resolver coil 34a.

Therefore, in the third embodiment, the number of the leakage flux shielding long holes 101 is not a divisor of the number of poles of the resolver rotor 32 and is not a multiple, that is, a divisor and a multiple of the number of poles of the resolver rotor 32 are excluded. The number is set to suppress noise.
For example, if the number of the leakage flux shielding long holes 101 is four and the number of poles of the resolver rotor 32 is six as shown in FIG. 2, the number of the leakage flux shielding long holes 101 is the number of the resolver rotor 32. It is possible to suppress noise that occurs when the number is a divisor or multiple of the number of poles.
Further, the combination of the number of rotor poles of the resolver 31 and the number of slots 101 for leakage magnetic flux shielding is such that the number of rotor poles: the slot 101 for leakage flux shielding is 6: 4, 3: 4, 4: Other combinations such as 3, 2: 3, 8: 3 are also applicable.

Embodiment 4 FIG.
Since the resolver 31 detects the rotor rotation angle of the rotating electrical machine, it is necessary to connect the rotating shaft 7 and the resolver rotor 32 reliably and with sufficient strength. For this purpose, press fitting is used as one of the fixing methods.
In the fixing by press-fitting, all or a part of the inner diameter of the resolver rotor 32 is made smaller than the outer diameter of the rotating shaft, and the resolver rotor 32 is pushed into the rotating shaft 7 and fixed by applying a load in the axial direction. At this time, since a great load acts in the radial direction of the resolver rotor 32, the outer shape of the resolver rotor 32 may change before and after the press-fitting.

In the VR type resolver, the outer shape of the resolver rotor 32 is designed so that the gap permeance between the resolver rotor 32 and the stator teeth 34b changes in a sine wave shape by the rotation of the resolver rotor 32. If a desired gap permeance cannot be obtained due to a change in the outer shape due to the press-fitting, noise is superimposed on the output waveform, and the angle detection accuracy is lowered.
If the external deformation amount due to the press-fitting is constant, it is possible to design the shape on the premise of deformation. However, since machining errors are inevitable in the inner diameter of the resolver rotor 32 and the outer diameter of the rotary shaft 7, variations in the load acting on the resolver rotor 32 during press-fitting are unavoidable, and the amount of external deformation is made constant. Have difficulty. Therefore, the countermeasure of making the rotor shape woven in advance with the external deformation is not effective.

Therefore, in the fourth embodiment, the press-fitting hole of the resolver rotor 32 is not made into a perfect circle shape, and most of the radial load acts on the inner peripheral side of the portion corresponding to the leakage flux shielding long hole 101 at the time of press-fitting. Shaped.
FIG. 9 is a front view of the resolver rotor according to the fourth embodiment.
Hereinafter, the resolver rotor according to the fourth embodiment will be described with reference to FIG.
In FIG. 9, the resolver rotor 32 according to the fourth embodiment has a leakage flux shielding long hole 101 disposed so as to surround the rotating shaft mounting hole 102 and faces the central portion (center) of the leakage flux shielding long hole 101. One protrusion 104, that is, a resolver rotor press-fitting convex portion is provided on the inner peripheral surface of the rotary shaft mounting hole 102 corresponding to the portion to be engaged.

  By providing the protrusion 104 on the inner peripheral surface of the rotation shaft mounting hole 102 in this way, most of the radial load acting on the resolver rotor 32 due to press-fitting into the rotation shaft 7 is concentrated on the protrusion 104. Become. Therefore, the protrusion 104 is displaced in the outer peripheral direction by press-fitting. However, since the protruding portion 104 is disposed on the thin wall portion on the inner peripheral side of the leakage flux shielding long hole 101, most of the load acting on the protruding portion 104 is absorbed as bending of the thin portion, and leakage flux shielding is performed. The portion outside the long hole 101 is hardly deformed and the outer shape of the resolver rotor 32 does not change.

Thereby, even when the resolver rotor 32 is fixed to the rotating shaft 7 by press-fitting, the outer shape deformation of the resolver rotor 32 can be suppressed to the minimum, and the angle detection accuracy is not lowered.
In addition, here, an example in which the number of poles of the resolver rotor 32 is six and the number of leakage flux shielding long holes 101 is four is shown, but these numbers are not limited to this example, The same effect can be obtained with numbers.

Further, as shown in FIG. 10, a plurality of protrusions 104, that is, a plurality of resolver rotor press-fitting protrusions, are provided on the inner peripheral surface of the leakage flux shielding long hole 101. The number of points receiving the load increases, and the load is evenly applied to each of the leakage flux shielding long holes 101 and the protrusions 104, so that the effect of suppressing deformation is improved.
In addition, the three protrusions 104 shown in FIG. 10 are equally arranged on the central portion of the leakage flux shielding long hole 101 and on both sides thereof, except for the protrusion 104 in the central portion. Even if one or more protrusions 104 are equally disposed on both sides, the same effect, that is, the effect that the points receiving the load are dispersed and the deformation can be suppressed can be obtained.
As shown in the fourth embodiment, the protrusion 104 for attaching the rotating shaft is on the line connecting the center of the rotating shaft 7 and the leakage flux shielding elongated hole 101, that is, the portion facing the leakage flux shielding elongated hole 101. By providing a multiple of the number of protrusions 104 of the leakage magnetic flux shielding long hole 101, it is possible to suppress the deformation of the resolver outer shape due to press-fitting, and to prevent a decrease in angle detection accuracy. .

Embodiment 5 FIG.
As shown in the embodiments so far, the leakage flux shielding long hole 101 energizes the magnetic flux leaking via the rotary shaft 7 and the conductor 35 disposed in the rotary shaft mounting hole 102 of the resolver rotor 32. This has the effect of reducing the influence of the magnetic flux caused by this and suppressing the decrease in angle detection accuracy.
However, since the magnetic flux shielding effect of the leakage flux shielding long hole 101 differs depending on the positional relationship between the leakage magnetic flux shielding long hole 101 and the conductor 35, the magnetic flux generated by energization of the conductor 35 affects the angle detection accuracy. Therefore, in the fifth embodiment, the influence of the magnetic flux by the conductor 35 is further reduced by setting the positional relationship between the leakage flux shielding long hole 101 and the conductor 35.

FIG. 11 is an explanatory view for explaining a resolver rotor according to Embodiment 5 of the present invention, and FIG. 12 is a front view of the resolver rotor according to Embodiment 5 of the present invention.
Hereinafter, the resolver rotor according to the fifth embodiment will be described with reference to FIGS. 11 and 12.
FIG. 11 is an explanatory diagram for explaining the problem of the conventional example. In the resolver rotor 32 of FIG. 11, the two conductors 35 passing through the rotary shaft 7 are located with respect to the center of the rotary shaft 7. The number of slots 101 for leakage magnetic flux shielding of the resolver rotor 32 is 4 at a position of 180 degrees, and a line segment connected to the bridge portion 103 and a line segment connected to the conductor 35 around the rotation shaft 7 Is arranged so that the angle J is 45 degrees. In such an arrangement, the magnetic flux around the conductor 35 is likely to leak from the bridge portion 103 of the leakage flux shielding long hole 101 as indicated by an arrow H in FIG. The effect of a decrease in detection accuracy is reduced.

Therefore, in the fifth embodiment, as shown in FIG. 12, the two conductors 35 passing through the rotary shaft 7 are installed at a position of 180 degrees with respect to the center of the rotary shaft 7 and the leakage flux shielding long hole 101 is formed. 4, the bridge portion 103 and the conductor 35 formed between the adjacent leakage flux shielding long holes 101 are arranged on the same line in the radial direction from the center of the rotation shaft 7.
By arranging in this way, the magnetic flux around the conductor 35 is shielded by the leakage flux shielding long hole 101 as indicated by the arrow I in FIG.

  As in the fifth embodiment, a conductor 35 for passing a field current is disposed along the axial direction of the rotating shaft 7, the conductor 35 is disposed in the wiring groove 7 a in the rotating shaft mounting hole 102, and the conductor 35 is When the resolver rotor 32 is provided with four leakage flux shielding long holes 101 provided at a position of 180 degrees with respect to the center of the rotating shaft 7, the radius extending from the center of the rotating shaft 7 to the conductor 35 is extended. By providing the bridge portion 103 of the leakage flux shielding long hole 101 on the wire, it is difficult for the magnetic flux generated by the current flowing through the conductor 35 to flow to the outer peripheral portion of the resolver rotor 32, thereby suppressing the decrease in angle detection accuracy. it can.

Embodiment 6 FIG.
In the fourth embodiment, the effect of suppressing deformation at the time of press-fitting by the leakage flux shielding long hole 101 has been described. However, since the spring constant in the radial direction of the portion to which the load is applied is reduced by providing the leakage flux shielding long hole 101, leakage occurs at the same tightening margin (difference between the rotating shaft outer diameter radius and the resolver rotor inner diameter radius). The fixing force of the resolver rotor 32 with respect to the rotary shaft 7 after press-fitting is reduced as compared with the case without the magnetic flux shielding long hole 101.
As a method for improving the fixing force of the resolver rotor 32, in the sixth embodiment, a point for receiving a load is provided on the inner peripheral side of the bridge portion 103, the rotating shaft 7, the four leakage flux shielding long holes 101, and the resolver rotor. The resolver rotor 32 is fixed with a strong fixing force by setting a positional relationship in which the central angle of the two conductors 35 disposed on the inner peripheral portion 32 is set at a position of 180 degrees.

FIG. 13 is a front view of a resolver rotor according to the sixth embodiment.
Hereinafter, the resolver rotor according to the sixth embodiment will be described with reference to FIG.
In FIG. 13, the resolver rotor 32 has two conductors 35 passing through the rotation shaft 7 installed at a position of 180 degrees with respect to the center of the rotation shaft 7, and surrounds the rotation shaft mounting hole 102 of the resolver rotor 32. Are provided with four projections 104 on the inner peripheral side of the bridge portion 103. The angle K between the bridge portion 103 and the line segment connecting the center of the rotation axis and the conductor 35 is 45. It is arranged at a position where it becomes a degree.
That is, the conductor 35 is disposed at a position facing the leakage magnetic flux shielding elongated hole 101, and the protrusion 104 for press-fitting the resolver rotor 32 into the rotation shaft 7, that is, the press-fitting convex portion is attached to the rotation shaft facing the bridge portion 103. This is provided at the position of the inner peripheral surface of the hole 102.

  When the resolver rotor 32 is press-fitted into the rotary shaft 7, the inner circumferential side of the leakage flux shielding long hole 101 is not bent by a radial load acting on the resolver rotor 32 due to the press-fitting. The same fixing force as that obtained when the conventional resolver rotor 32 without the holes 101 is press-fitted can be obtained. Further, by arranging the protrusion 104 provided on the inner peripheral surface of the rotating shaft mounting hole 102 at a position facing the bridge portion 103, it is possible to avoid fixing with a weak fixing force at the weak conductor 35 portion and It is possible to fix to a rotating shaft made of a high strength member such as a strong fixing force.

In the sixth embodiment, as an example, in FIG. 13, the angular protrusion 104 is provided on the inner peripheral surface side of the rotation shaft mounting hole 102, but the shape is not limited to this, As described above, the same effect can be obtained with other shapes.
In the fourth to sixth embodiments, the effect of fixing the rotating shaft 7 and the resolver rotor 32 by press-fitting has been described. However, the resolver rotor 32 is not necessarily fixed only by press-fitting. It is also possible to use a combination of screw fastening, adhesion, welding and the like, and using these methods together does not reduce the effect of the present invention.

  In the description of each embodiment, an example in which the resolver stator 34 having 12 slots and the shaft multiple angle 6, that is, the number of peaks of the outer shape of the resolver rotor is six, is used. The present invention is not applied, and the present invention can be similarly applied even when the number of slots and the number of resolver rotor poles have other values. In addition, the coil terminal routing and terminal position can be similarly applied to other arrangements, and the same effect can be obtained.

  In the present invention, each embodiment can be appropriately modified or omitted within the scope of the invention.

DESCRIPTION OF SYMBOLS 1 Rotating electrical machine for vehicles 2 Housing 3, 4 Bracket 5 Bolt 7 Rotating shaft 7a Wiring groove of conductor 8, 9 Bearing 10 Pulley 11 Nut 12 Rotor core 13 Rotor coil 16, 17 Core member 16a Tubular portion 16b Claw-shaped magnetic pole portion 17a Tubing 17b Claw-shaped magnetic pole portion 18, 19 Cooling fan 22 Slip ring 24 Stator core 25 Stator coil 26 Brush 27, 28 Brush holder 31 Resolver (rotation angle detector)
32 Resolver rotor 34 Resolver stator 34a Resolver coil 34b Stator teeth 35 Conductor 101 Leakage magnetic flux shielding long hole 102 Rotating shaft mounting hole 103 Bridge portion 104 Projection portion (resolver rotor press-fitting convex portion).

Claims (7)

  A resolver stator having an output coil and an excitation coil, and a resolver rotor having an uneven outer peripheral surface facing the inner peripheral surface of the resolver stator with a gap therebetween and attached to a rotating shaft, the resolver rotor includes: A resolver characterized in that a leakage flux shielding elongated hole is provided along the outer peripheral surface of the rotating shaft, and the number of the leakage flux shielding elongated holes is different from the number of poles of the resolver rotor.   The leakage magnetic flux shielding oblong hole shields magnetic flux leaking through the rotating shaft or magnetic flux generated by a conductor wired in the axial direction on the resolver rotor mounting portion of the rotating shaft. The resolver according to claim 1.   3. The resolver according to claim 1, wherein the leakage flux shielding oblong hole is a number excluding a divisor and a multiple of the number of poles of the resolver rotor.   A resolver rotor press-fitting convex portion for press-fitting the resolver rotor into the rotary shaft in a portion facing the leakage magnetic flux shielding long hole on the inner peripheral surface of the rotary shaft mounting hole provided at the center of the resolver rotor The resolver rotor press-fitting convex portion is a single resolver rotor press-fitting convex portion provided at the central portion of the leakage magnetic flux shielding length hole, and a plurality of resolver rotors arranged evenly on the central portion and both sides thereof. Of the plurality of resolver rotor press-fitting convex portions arranged evenly on the press-projecting convex portion and the portion excluding the resolver rotor press-fitting convex portion at the central portion, the one is formed by any of the resolver rotor press-fitting convex portions. The resolver according to any one of claims 1 to 3.   The conductor and a bridge portion formed between adjacent leakage flux shielding long holes, and the conductor and the bridge portion are arranged on the same line in the radial direction from the center of the rotating shaft. The resolver according to claim 2.   The conductor and a resolver rotor press-fitting convex portion that is provided on the inner peripheral surface of the rotary shaft mounting hole and press-fits the resolver rotor into the rotary shaft, and the conductor faces a leakage flux shielding long hole. The resolver according to claim 2 or 5, wherein the resolver rotor press-fitting convex portion is disposed at a position facing the bridge portion.   A rotating electrical machine for a vehicle, to which the resolver according to any one of claims 1 to 6 is attached.

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