JP2013121225A - Resolver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a resolver in which the detection accuracy of turning angle is enhanced.SOLUTION: The resolver comprises: a resolver rotor 1 attached to the rotating shaft of a rotary electric machine; and a resolver stator 2 provided to surround the resolver rotor 1. The resolver stator 2 has a stator core 3 having a plurality of teeth 3a projecting inward on the circular inner peripheral side, and the main deformation mode of the stator core 3 during the processing is deformation of secondary mode where the inner peripheral side becomes elliptical. At least one of the integers of |A±B| and the integers of |A±B±4| represented by the magnetomotive force order of the resolver and the shaft angle B of the resolver rotor 1 match each other. The stator core 3 is formed so that the rolling direction 22 of the material of the stator core 3 becomes substantially the same direction as the longitudinal axis direction 21 of secondary mode deformation.

Description

  The present invention relates to a resolver that detects the rotation of a rotating electrical machine, and more particularly to the structure of a resolver stator.

  As a resolver stator structure of a conventional resolver, for example, a stator provided with magnetic pole teeth arranged uniformly along the circumferential direction of the annular stator base, and the relative angular position of the stator are changed to change the stator. In a resolver equipped with a rotor that changes the reluctance component of the gap, the stator core formed by laminating thin silicon steel plates intentionally moves the position of each thin plate by the mold when laminating the thin plates. Assembling is performed by so-called rotational lamination in which the positional relationship when punched is shifted in the rotational direction. By doing this, the shape error that occurs during manufacturing is averaged to improve the angle detection accuracy (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2005-127768 (page 4-5, FIG. 1)

The resolver stator as shown in Patent Document 1 has a problem that the working efficiency is not good due to the rotational lamination in which the thin plates are laminated while being shifted in the rotational direction.
Rotational lamination is based on the assumption that the outer peripheral shape of the stator core is circular. If there are protrusions or notches on the outside of the stator core, rotational lamination is impossible or the rotational pitch of the rotational lamination is limited. As a result, the angle detection accuracy cannot be improved as expected.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a resolver with improved rotational angle detection accuracy.

  A resolver according to the present invention includes a resolver rotor attached to a rotating shaft of a rotating electrical machine, and a resolver stator provided to surround the resolver rotor, and the resolver stator protrudes inward to a circular inner peripheral side. A stator core having a plurality of teeth is formed, and the main deformation mode at the time of processing of the stator core is a deformation of a secondary mode in which the inner peripheral side is an elliptical shape. The magnetomotive force order A of the resolver and the axial multiplier angle B of the resolver rotor The integer of | A ± B | and the integer of | A ± B ± 4 |, which are expressed as follows, match at least one, and the rolling direction of the material of the stator core and the major axis direction of the deformation of the secondary mode are A stator core is formed so as to be in substantially the same direction.

  According to the resolver of the present invention, the main deformation mode at the time of processing of the stator core is a deformation of the secondary mode in which the inner peripheral side is an elliptical shape, and is expressed by the magnetomotive force order A of the resolver and the shaft multiplier angle B of the resolver rotor. The integer of | A ± B | and the integer of | A ± B ± 4 | coincide with each other, and the rolling direction of the stator core material and the major axis direction of the secondary mode deformation are substantially in the same direction. Since the stator core is formed as described above, the influence of the leakage magnetic flux from the rotor of the rotating electrical machine to be detected on the angle detection error of the resolver can be reduced, and the angle detection accuracy can be improved. In addition, since it is not necessary to rotate and stack the stator core, the productivity and assemblability are improved.

It is a front view of the resolver by Embodiment 1 of this invention. It is side surface sectional drawing of FIG. It is AA sectional drawing of FIG. It is sectional drawing which shows the state which assembled | attached the resolver by Embodiment 1 of this invention to the bracket of a rotary electric machine. It is sectional drawing which shows the state which incorporated the resolver by Embodiment 1 of this invention in the rotary electric machine. It is explanatory drawing explaining the secondary mode deformation | transformation and rolling direction of the stator core of the resolver by Embodiment 1 of this invention. It is explanatory drawing which shows an example of the winding number pattern of the excitation winding of 12 slots and magnetomotive force degree 6 by the resolver by Embodiment 1 of this invention. It is explanatory drawing which shows the analysis result of the angle detection error by the resolver by Embodiment 1 of this invention in the presence or absence of secondary mode deformation | transformation. In the resolver by Embodiment 1 of this invention, it is explanatory drawing which shows the analysis result of the relationship between the angle which the major axis direction of secondary mode deformation | transformation and the rolling direction make, and an angle detection error. It is a plane sectional view showing an outer rotor type resolver by Embodiment 1 of this invention. It is a plane sectional view of a resolver by Embodiment 2 of this invention. It is a top view of the stator core of the resolver by Embodiment 3 of this invention. It is a top view which shows the other example of the stator core of the resolver by Embodiment 3 of this invention. It is a top view which shows another example of the stator core of the resolver by Embodiment 3 of this invention. It is a top view which shows another example of the stator core of the resolver by Embodiment 3 of this invention.

Embodiment 1 FIG.
Hereinafter, a description will be given based on the drawings. 1 is a front view of a resolver according to Embodiment 1, FIG. 2 is a side sectional view of FIG. 1, and FIG. 3 is a sectional view of a resolver stator as viewed from AA in FIG. FIG. 4 is a cross-sectional view showing a state in which the resolver of Embodiment 1 is assembled to a bracket of a rotating electrical machine, and FIG. 5 is a cross-sectional view showing a state in which the resolver is incorporated in the rotating electrical machine.

First, the structure of the resolver will be described with reference to FIGS.
The resolver includes a resolver rotor 1 configured by laminating a plurality of punched silicon steel plates, and a resolver stator 2 disposed so as to surround the outer periphery thereof.
The resolver stator 2 includes an annular stator core 3, a pair of insulating members 4 and 5 provided on the stator core 3, and a stator coil 6 wound around the teeth 3 a of the stator core 3 via the insulating members 4 and 5. Has been.
Next, each part of the resolver stator 2 will be described in more detail.

As shown in FIGS. 2 and 3, the stator core 3 is formed by laminating a plurality of silicon steel plates, the outer peripheral side and the inner peripheral side are circular, and the inner peripheral side has a plurality of teeth protruding radially inward. 3a is equally formed in the circumferential direction. The inner diameter side of the tooth 3a faces the outer diameter side of the resolver rotor 1 with a minute gap.
The insulating members 4 and 5 are made of an insulating resin, and are provided so as to cover the teeth 3a by sandwiching the stator core 3 from both sides.
The stator coil 6 is wound around the teeth 3a via the insulating members 4 and 5, and is composed of three independent windings of one excitation winding and two output windings.
As shown in FIGS. 1 and 2, a part of the insulating member 4 has an extended portion 4 a formed to extend radially outward from the stator core 3, and the terminal 7 is insert-molded here. ing. The lead wire 6 a of the stator coil 6 is connected to the terminal pin 7 a of the terminal 7.

Next, the state in which the resolver is assembled to the rotating electrical machine subject to rotation detection will be described with reference to FIGS. 4 is a partial view, and FIG. 5 is an overall view.
The resolver rotor 1 is attached to the shaft end of the rotating shaft 9 of the rotating electrical machine. The rotating shaft 9 is made of a magnetic material.
The resolver stator 2 surrounds the resolver rotor 1 and is disposed on the rear bracket 8 of the rotating electrical machine coaxially with the rotary shaft 9. Based on the respective output voltages generated in the two output windings of the resolver coil 6 due to the change in the gap magnetic flux density distribution between the resolver rotor 1 and the resolver stator 2 as the rotary shaft 9 rotates, the rotary shaft of the rotating electrical machine The magnetic pole position of the rotor 10 fixed to 9 is detected.

The interior of the rotating electrical machine will be described with reference to FIG. 5. The rotating shaft 9 of the rotor 10 is rotatably supported by two bearings 11 provided on the bracket side, and a field winding 10 a is wound around the rotor 10. Has been. A cylindrical stator 12 around which a stator winding 12 a is wound is disposed on the outer peripheral side of the rotor 10. In addition, two slip rings 13 are assembled on the rotating shaft 9, and a brush 14 that slides on the slip ring 13 is provided.
In addition, this rotary electric machine shows an example, and is not limited to the figure.

Next, the relationship among the magnetomotive force, the permeance of the resolver, the respective orders of the output winding, the deformation mode of the stator core, the rolling direction, and the angle detection error will be described with reference to FIGS.
In a resolver composed of a rotor 1 and a stator 2 formed by laminating silicon steel plates, the order of the magnetomotive force generated by energizing the exciting winding of the stator coil 6 wound around the teeth 3a of the stator core 3 (hereinafter referred to as magnetomotive force). The order of the magnetic flux density generated in the gap between the stator core 3 and the resolver rotor 1 | A ± B | The two output windings are wound around the teeth 3a, with the order of which is an integer of 1 and 90 degrees out of phase with each other.
For an ideal output winding with a small angle detection error that is wound in any integer order of | A ± B |, the number of teeth is limited, so that the winding is wound around one tooth. In order to round the number of turns to an integer, the number of turns is adjusted so as to reduce the angle detection error by increasing / decreasing the number of turns by any number of teeth.

  When leakage magnetic flux flows from the rotor 10 of the rotating electrical machine having permanent magnets or field windings to the resolver rotor 1 and the resolver stator 2 via the rotating shaft 9 which is a magnetic material, excitation winding necessary for angle detection is required. Since the magnetic flux as noise other than the magnetic flux due to the magnetomotive force of the wire is linked to the output winding of the stator coil 6, the order of the output winding is selected to avoid the order of the magnetic flux density distribution caused by the leakage magnetic flux in the gap. To do. However, when the stator core is deformed during processing, the permeance changes due to the deformation, and therefore the influence of the leakage magnetic flux may appear in the order of the gap magnetic flux density distribution picked up by the output winding.

  In the punching process of the silicon steel plate for manufacturing the stator core 3, holes required for the inner diameter side shape are sequentially punched, and finally the outer diameter is punched to form one stator core shape. In this process, the clearance of the punching die is not uniform, and the shape on the inner diameter side of the stator core is not uniform. Depending on the constraint condition, the deformation is performed in a deformation mode in which either one of the orthogonal direction and the parallel direction to the outer peripheral surface is the long axis. In general, the deformation amount in the lower order mode is larger than the deformation amount in the higher order mode.

FIG. 6 is a diagram for explaining the relationship between the deformation of the secondary mode of the stator core 3 (hereinafter referred to as secondary mode deformation) and the rolling direction described later. FIG. 7 is a chart showing an example of a winding number pattern of the excitation winding when the stator core 3 has 12 slots and a magnetomotive force order of 6. FIG.
The secondary mode deformation is a mode in which there are two deformation portions as shown in FIG. The major axis direction 21 of this secondary mode deformation coincides with the major axis direction of the ellipse deformed into an elliptical shape.
By investigating the major axis direction 21 of the secondary mode deformation in advance by analysis or experiment, when the stator core 3 is punched, the mold direction and the stator are aligned so that the major axis direction 21 is aligned with the rolling direction of the silicon steel sheet. It is possible to adjust the direction of the punching pattern.
In FIG. 6, the line indicated by reference numeral 22 illustrates the rolling direction, and the angle θ formed between the major axis direction 21 of the secondary mode deformation and the rolling direction 22 is hereinafter simply referred to as the angle θ formed. To. Further, a circle indicated by a broken line in FIG. 6 is an inner diameter of the tooth 3a when there is no deformation.

When the deformation amount of the secondary mode deformation is large, the order of permeance due to the outer diameter shape of the resolver rotor 1, that is, the shaft angle multiplier B, changes, and the order of the magnetic flux density distribution generated in the air gap by the leakage magnetic flux and the output The order of the windings coincides, and the output winding picks up magnetic flux as noise other than the magnetic flux generated by the excitation winding, resulting in an angle detection error, which may deteriorate the angle detection accuracy.
For example, if the magnetomotive force order A of the exciting winding is 6, the shaft angle multiplier B of the resolver rotor 1 is 8, and the order of the output winding is 2, the integers of | A ± B | are 2 and 14, Since the integer of | A ± B ± 4 | when some fourth-order variation is added to the permeance is 2, 6, 10, 18, it has at least one common integer 2.

Therefore, the resolver according to the present embodiment has an integer of | A ± B | represented by the magnetomotive force order A of the resolver and the shaft angle multiplier B of the resolver rotor in the resolver configured as shown in FIGS. When there is a leakage magnetic flux such that the integer of | A ± B ± 4 | has at least one matching numerical value, the rolling direction of the material of the stator core 3 and the major axis direction of the secondary mode deformation are substantially in the same direction. Thus, the stator core 3 is formed. This can be achieved by adjusting the mold direction and the direction of the stator punching pattern in the punching step.
The reason why the angle detection accuracy can be improved by this configuration will be described below.

FIG. 8 is a graph showing an analysis result explaining that the presence or absence of deformation simulating the secondary mode deformation at the time of punching a silicon steel plate affects the angle detection error when there is a leakage magnetic flux from the rotor The vertical axis is the angle detection error in the direct reading method, the horizontal axis is the rotation speed of the rotor, and the angle θ made with the secondary mode deformation is compared with the case where the angle θ is 0 and without. is there. The stator core has 12 slots, the shaft angle multiplier B is 8, and the magnetomotive force order A is 6.
As can be seen from the figure, the relative value of the angle detection error is higher at any rotational speed when there is secondary mode deformation than when there is no secondary mode deformation.
Next, the point that this angle detection error is affected by the rolling direction will be described.

FIG. 9 shows the rolling direction 22 of the silicon steel plate constituting the stator core 3 and the major axis direction of the deformation simulating the secondary mode deformation at the time of the punching of the silicon steel plate when there is a leakage magnetic flux of the rotor of the rotating electrical machine. 21 is a graph showing the result of a magnetic field analysis on the relationship between the angle θ formed with the angle 21 and the angle detection accuracy. The stator core 3 has 12 slots, the shaft angle multiplier B is 8, and the magnetomotive force order A is 6.
From the figure, it can be seen that the smaller the angle θ formed, the better the angle detection accuracy. Further, it can be seen that when the number of rotations of the rotor increases, the number of magnetic fluxes in which leakage magnetic flux interlinks with the output winding per unit time increases, so that the influence on the angle detection accuracy is large. Further, when the formed angle θ is not less than 0 degrees and not more than 45 degrees, that is, in the case of 12 slots, when the angle θ is within 1.5 teeth pitch, the angle detection error is reduced to a minimum value around 0 degrees. It can be said that ˜45 degrees is a desirable range of the angle θ formed to improve the angle detection accuracy.

  In the above description, the resolver was an inner rotor type. However, as shown in FIG. 10, the resolver stator 3 is disposed on the inner side, and the resolver rotor 1 is disposed on the outer peripheral side thereof. A similar effect can be expected even with a resolver.

  As described above, the resolver according to the first embodiment includes the resolver rotor attached to the rotating shaft of the rotating electrical machine and the resolver stator provided to surround the resolver rotor, and the resolver stator has a circular shape. It has a stator core formed with a plurality of teeth projecting inward on the circumferential side, and the main deformation mode at the time of processing the stator core is a deformation of a secondary mode in which the inner circumferential side is elliptical, and the magnetomotive force order of the resolver The integer of | A ± B | and the integer of | A ± B ± 4 | represented by A and the shaft angle multiplier B of the resolver rotor match at least one, and the rolling direction and secondary mode of the stator core material Since the stator core is formed so that the major axis direction of the deformation is substantially the same direction, the influence of leakage magnetic flux from the rotor of the rotating electrical machine on the angle detection error can be reduced, It can be improved degree detection accuracy. In addition, since it is not necessary to rotate and laminate when assembling the stator core, productivity and assemblability are improved.

Embodiment 2. FIG.
FIG. 11 is a plan sectional view showing a resolver according to the second embodiment. Constituent elements and similar elements in the first embodiment are denoted by the same reference numerals and description thereof is omitted. Further, since the basic configuration of the resolver itself is the same as that of the first embodiment, the description thereof will be omitted, and the following description will focus on differences. The difference from the first embodiment is the relationship between the rolling direction and the teeth of the stator core.

As shown in the figure, in addition to the requirements of the first embodiment, the stator core 3 of the second embodiment includes any two teeth that are symmetrical with respect to the shaft center among the teeth 3a on the inner peripheral side. The center axis connecting the centers and the rolling direction 22 are made to coincide.
By doing in this way, compared with the case where the rolling direction 22 and the teeth 3a center axis | shaft do not correspond, the magnetic resistance of the rolling direction 22 of the stator core 3 can be made smaller, Therefore Magnetic flux is set to the angle of the set rolling direction. It becomes easy to flow.

  As described above, according to the resolver of the second embodiment, since the central axis connecting the centers of any two teeth at the symmetrical position on the inner peripheral side of the stator core is matched with the rolling direction, the set rolling direction Since the magnetic flux easily flows at the angle, the rotational angle detection accuracy can be further improved as compared with the first embodiment.

Embodiment 3 FIG.
12-15 is a top view which shows the stator core of the resolver by Embodiment 3. FIG. Constituent elements and similar elements in the first embodiment are denoted by the same reference numerals and description thereof is omitted. Further, since the basic configuration of the resolver itself is the same as that of the first embodiment, the description thereof will be omitted, and the following description will focus on differences. The difference from Embodiment 1 or 2 is the shape of the stator core.

  First, FIG. 12 will be described. The stator core 3 shown in FIG. 12 has a circular outer periphery and is provided with two notches 3b at positions on the outer periphery that are symmetrical with respect to the central axis. By adopting such a shape, the stator core 3 is not uniform in structural strength due to the notch. That is, since a plane of symmetry is generated in terms of structural strength, secondary mode deformation is likely to occur when the stator core is punched, and either the direction connecting the notches or the orthogonal direction is the major axis direction of the secondary mode deformation. Therefore, since the rolling direction can be easily adjusted to the major axis direction, the angle detection accuracy can be easily improved.

  FIG. 13 shows another embodiment. As shown in the figure, two protrusions 3c protruding radially outward are provided on the outer periphery of a basically circular stator core 3 at positions symmetrical with respect to the axis. Due to this shape, the structural strength in the circumferential direction is not uniform, and a plane of symmetry is generated in the structural strength. In the case of the figure, the strength in the direction perpendicular to the center line of both protrusions 3c is weakened, and the direction is perpendicular to that direction. Secondary mode deformation is likely to occur when the stator core is punched in either direction. Therefore, since the rolling direction can be easily matched with the major axis direction of the secondary mode deformation, the angle detection accuracy can be improved.

  FIG. 14 shows another embodiment. As shown in the figure, the outer shape of the stator core 3 is rectangular. Due to this shape, the structural strength in the circumferential direction is not uniform, and a plane of symmetry is generated in the structural strength, and secondary mode deformation is likely to occur. In the case of the figure, in the short side direction or long side direction of the rectangle passing through the axis Either one of the lines is the major axis direction of the secondary mode deformation. Therefore, since the rolling direction can be easily matched with the major axis direction, the angle detection accuracy can be improved.

  FIG. 15 shows still another embodiment. In the outer peripheral side of the stator core 3 having a circular outer peripheral shape, joint portions for performing caulking, welding, bolt fixing, etc. are provided at two locations symmetrical to the central axis. FIG. 15A shows a case where the joint 3d is welded, and FIG. 15B shows a case where the joint 3e is caulked or bolted. Even in these shapes, the structural strength in the circumferential direction is not uniform, a plane of symmetry is generated in the structural strength, and secondary mode deformation is likely to occur, and either the line connecting the joints or the direction orthogonal thereto is the length of the secondary mode deformation. Since it becomes an axial direction and the rolling direction can be easily matched to this major axis direction, it is possible to improve the angle detection accuracy.

As described above, according to the resolver of the third embodiment, the shape of the outer periphery of the stator core is circular and has two notches at the outer periphery symmetrical position, so that the structural strength in the circumferential direction is not uniform, and the structure A symmetrical plane is generated in strength, and either the direction connecting the notches or the direction orthogonal thereto is the major axis direction of the secondary mode deformation, so the rolling direction can be easily adjusted to this major axis direction, In addition to the effects of the first or second embodiment, the angle detection accuracy can be easily improved.
In addition, since the outer shape of the stator core is circular and two protrusions are provided at symmetrical positions on the outer periphery, either the direction connecting the protrusions or the direction orthogonal thereto becomes the major axis direction of the secondary mode deformation. The same effects as described above can be obtained.
In addition, since the outer peripheral shape of the stator core is rectangular, the major axis direction of the secondary mode deformation can be easily specified, so that the same effect as described above can be obtained.
Further, the outer shape of the stator core is circular, and has two joints at symmetrical positions on the outer peripheral side, and the stator core material is joined and integrally formed at the joints. One of the orthogonal directions becomes the major axis direction of the secondary mode deformation, and the same effect as described above can be obtained.

DESCRIPTION OF SYMBOLS 1 Resolver rotor 2 Resolver stator 3 Stator core 3a Teeth 3b Notch part 3c Protrusion part 3d, 33e Joint location 4,5 Insulation member 4a Extension part 6 Stator coil 6a Lead wire 7 Terminal 7a Terminal pin 8 Rear bracket 9 Rotating shaft 10 Rotor 10a Field winding 11 Bearing 12 Stator 12a Stator winding 13 Slip ring 14 Brush 21 Major axis direction of secondary mode deformation 22 Rolling direction.

Claims (6)

A resolver rotor attached to the rotating shaft of the rotating electrical machine, and a resolver stator provided surrounding the resolver rotor,
The resolver stator has a stator core formed with a plurality of teeth projecting inwardly on a circular inner peripheral side,
The main deformation mode at the time of processing of the stator core is a deformation of a secondary mode in which the inner peripheral side has an elliptical shape,
The integer of | A ± B | and the integer of | A ± B ± 4 | represented by the magnetomotive force order A of the resolver and the shaft angle multiplier B of the resolver rotor are at least one match.
The resolver, wherein the stator core is formed so that a rolling direction of the material of the stator core and a major axis direction of deformation of the secondary mode are substantially in the same direction. The resolver according to claim 1, wherein
A resolver, wherein a direction of a central axis connecting centers of any two teeth at a symmetrical position on an inner peripheral side of the stator core and the rolling direction coincide with each other. The resolver according to claim 1 or claim 2,
A resolver characterized in that the outer periphery of the stator core has a circular shape and has two notches at symmetrical positions on the outer periphery. The resolver according to claim 1 or claim 2,
The resolver characterized in that the outer periphery of the stator core has a circular shape and has two protrusions at symmetrical positions on the outer periphery. The resolver according to claim 1 or claim 2,
A resolver, wherein an outer periphery of the stator core is rectangular. The resolver according to claim 1 or claim 2,
The shape of the outer periphery of the stator core is circular, and has two joint portions at symmetrical positions on the outer peripheral side, and the stator core material is joined and integrated at the joint portions. Resolver.

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