JP2024020795A - Stator of resolver - Google Patents

Abstract

To reduce a magnetic flux interlinked with a stator winding by effectively shielding the magnetic flux generated by a rotary electric machine.SOLUTION: A stator 100 of a resolver 1 has a stator core 110 having a core back part 111 and a tooth 112 extending inside in a radial direction from a circumference of the core back part 111, an insulator 120 provided in the stator core 110, a stator winding 130 wound around the tooth 112 through the insulator 120, and an annular shield 160 covering a motor side of the stator core 110. The insulator 120 has a winding part attached to the tooth 112 and a flange part 125 extending outside in the radial direction from the winding part. The shield 160 has a first annular part 161 covering the core back part 111 and a second annular part 164 covering the stator winding 130. The flange part 125 is interposed between the core back part 111 and the first annular part 161.SELECTED DRAWING: Figure 2

Description

The present invention relates to a stator for a resolver, and particularly to a stator for a resolver equipped with a shield.

Conventionally, a resolver is known as a means for detecting the rotation angle of a rotating electric machine such as a motor or a generator. Due to changes in the current supplied to the windings of the rotating electrical machine to which the resolver is applied, part of the magnetic flux generated from the rotating electrical machine is superimposed on the signal flowing through the windings wound around the resolver's stator, causing the signal waveform to change. There is a possibility that the rotation angle of the rotating electric machine cannot be accurately detected due to the disturbance. Therefore, in order to suppress the influence of magnetic flux from a rotating electric machine, a resolver stator including a shield is known (for example, see Patent Document 1).

As shown in FIG. 10, the stator of the resolver disclosed in Patent Document 1 includes an electromagnetic shield 8 having an annular shield body that covers a stator winding 10 wound around a plurality of teeth portions 13, and a stator core 9 that is connected to a bolt. The electromagnetic shield 8 has a core fastening part 15 in which a core fastening hole 15a as a fastening hole is formed, and a shield fastening part 21 in which a shield fastening hole 21a connected to the core fastening hole 15a is formed.

In such a structure, bolts are inserted through the core fastening hole 15a and the shield fastening hole 21a to fasten the core fastening part 15 and the shield fastening part 21 together to the housing. In this case, a microhole 40 is formed in each core fastening portion 15 of the stator core 9, and a portion of the shield fastening portion 21 of the electromagnetic shield 8 is press-fitted into the microhole 40 for caulking. The company claims that this will dramatically improve the efficiency of co-tightening work.

Japanese Patent Application Publication No. 2014-107977

However, in the above structure, since the stator core 9 and the electromagnetic shield 8 are in contact with each other, there is a possibility that the magnetic flux generated by the rotating electrical machine may link from the electromagnetic shield 8 to the stator winding 10 via the stator core 9. . Furthermore, since the stator core 9 and the electromagnetic shield 8 overlap in the axial direction, the side surfaces of the stator core 9 are exposed. Therefore, there is a possibility that the magnetic flux generated by the rotating electrical machine may enter from the side surface of the stator core 9 and interlink with the stator winding 10.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a stator for a resolver that can effectively shield the magnetic flux generated by a rotating electrical machine and reduce the magnetic flux interlinking with the stator windings. It is said that

The present invention provides a stator core including an annular main body portion, a plurality of teeth extending radially inward from a periphery of the main body portion, an insulator provided on the stator core, and a plurality of teeth provided through the insulator. A stator winding wound around teeth, a plurality of terminal pins to which terminals of the stator winding are connected, a terminal block portion holding the plurality of terminal pins, and an annular shield covering the rotating electric machine side of the stator core. In the stator of the resolver, the insulator includes a winding portion attached to the teeth, and a flange portion extending radially outward from the winding portion, and the shield is connected to the stator core. and a second annular part that covers the stator winding wound around the teeth, between the main body part of the stator core and the first annular part of the shield. and a stator of a resolver in which the flange portion of the insulator is interposed.

According to the present invention, since the flange portion of the insulator is interposed between the main body portion of the stator core and the first annular portion of the shield, the magnetic flux generated by the rotating electrical machine is effectively shielded and the magnetic flux is directed to the stator windings. Interlinking magnetic flux can be reduced.

FIG. 1 is a plan view showing a resolver according to an embodiment of the present invention. It is an exploded perspective view showing a stator of a resolver of an embodiment. FIG. 2 is an exploded perspective view of the stator of the resolver of the embodiment viewed from below. It is a top view showing the stator of the resolver of an embodiment. It is a side view showing the stator of the resolver of an embodiment. It is a back view showing the stator of the resolver of the embodiment. FIG. 2 is a perspective view of the stator of the resolver of the embodiment viewed from below. FIG. 2 is a cross-sectional view of a portion of the stator of the resolver according to the embodiment, including bolts. FIG. 3 is a cross-sectional view of a portion of the stator of the resolver according to the embodiment, including a coupling pin. FIG. 2 is an exploded perspective view showing a stator of the resolver described in Patent Document 1.

1. Overall configuration of resolver FIG. 1 shows a resolver 1 according to an embodiment of the present invention. The resolver 1 is a VR (variable reluctance) resolver. The resolver 1 has a rotor 10 and a stator 100. The rotor 10 is fixed to the output shaft of a motor (not shown). The rotor 10 has a non-circular shape having a plurality of protrusions 11 that protrude outward in the radial direction when viewed from the axial direction. The rotor 10 has a structure in which a plurality of thin rotor cores are stacked in the axial direction. In the following description, the direction of the output shaft will be referred to as the "axial direction", and the direction orthogonal to the axial direction will be referred to as the "radial direction". Furthermore, the terms "upper" and "lower" refer to the vertical direction in FIG. 2 .

A thin plate-like rotor core constituting the rotor 10 is manufactured by pressing a plate made of electromagnetic steel plate into the illustrated shape. The rotor 10 is constructed by stacking the plurality of rotor cores in the axial direction and fixing them by caulking.

The stator 100 is arranged outside the rotor 10 and fixed to the housing 20. A gap is provided between the rotor 10 and the stator 100, so that the rotor 10 can rotate inside the stator 100. The housing 20 is a member to which the stator 100 of the resolver 1 is attached, and is provided with screw holes (not shown) for fixing the stator 100 of the resolver 1. The stator 100 of the resolver 1 is attached to the housing 20 by screwing the bolts 30 into the screw holes. In addition, although the number of bolts 30 is only one in FIG. 1, it is attached to the housing 20 with a plurality of bolts 30.

As shown in FIGS. 2 and 3, stator 100 has a stator core 110. As shown in FIGS. The stator core 110 has a structure in which a plurality of thin plate-shaped cores are stacked in the axial direction. The thin plate-shaped core includes an annular core back portion (main body portion) 111, a plurality of teeth 112 protruding radially inward from the core back portion 111, and a plurality of flanges 113 protruding radially outward from the core back portion 111. It is equipped with A through hole (insertion part) 113a through which the bolt 30 is inserted is formed in the flange 113 on a concentric circle in the circumferential direction. The core is manufactured by pressing a plate made of electromagnetic steel sheet. The stator core 110 is obtained by stacking a plurality of these cores in the axial direction and fixing them by caulking. The diameter of the through hole 113a is such that the bolt 30 does not come into contact with the stator core 110 when the bolt 30 is inserted into the through hole 113a.

Insulators 120 are fixed to stator core 110 from both sides in the axial direction. The insulator 120 is made of insulating resin and is injection molded using the stator core 110 as an insert material. As shown in FIGS. 8 and 9, the insulator 120 includes a winding portion 121 fixed to each tooth 112 and a flange portion 125 extending radially outward from the winding portion 121.

The winding portion 121 is formed to surround the entire circumference of the teeth 112, and includes a body portion 122 at a radially central portion and an inner regulating portion that extends in the axial and circumferential directions on the inner peripheral side of the body portion 122. 123 , and an outer regulating portion 124 erected in the axial direction on the outer peripheral side of the body portion 122 . A stator winding 130 is wound around the body 122, and the inner regulating section 123 and the outer regulating section 124 regulate the range in which the conductive wire is wound so that the stator winding 130 does not collapse.

The flange portion 125 of the insulator 120 is provided with a plurality of protrusions 126 that protrude outward in the radial direction and are arranged at equal intervals in the circumferential direction. The protrusion 126 is formed to have substantially the same shape and size as the flange 113 of the stator core 110, and is arranged to overlap the flange 113 of the stator core 110. A through hole 126a is formed in the protrusion 126 and overlaps with the through hole 113a of the flange 113.

As shown in FIG. 2, a terminal block portion 140 is integrally molded with the insulator 120, and a plurality of terminal pins 141 are implanted in the terminal block portion 140 by insert molding. Further, a connector housing 142 is integrally formed on the lower side of the terminal block portion 140 in the axial direction. The terminal pin 141 has a crank shape in the axial direction, and has one end protruding into the terminal block section 140 and the other end protruding into the connector housing 142. A winding terminal 131 of the stator winding 130 is wound around and connected to one end of a terminal pin 141.

As shown in FIG. 3, the insulator 120 is formed with an annular projection 127 that projects downward in the axial direction. The annular projection 127 extends annularly along the core back portion 111 , and its end portion is connected to the terminal block portion 140 .

A terminal pin cover 150 is attached to the terminal block section 140. The terminal pin cover 150 includes a rectangular top plate portion 151, side plate portions 152 extending in the axial direction from three sides of the top plate portion 151, and a pair of side plate portions 152 extending in the axial direction from the lower edges of the side plate portions 152 facing each other. It consists of an arm portion 153. At the lower end portions of the pair of arm portions 153, claw portions 154 are formed that protrude toward each other.

On the other hand, a plurality of convex portions 143 are formed along one side of the upper surface of the terminal block portion 140 and protrude upward in the axial direction, and a side plate of the terminal pin cover 150 is formed on the radially outer surface of the convex portions 143. The inner circumferential surface of the portion 152 is brought into close contact. Furthermore, grooves 144 are formed on both sides of the terminal block portion 140, and a step portion 145 that is one step deeper is formed at the lower end of the groove 144. With this configuration, when the arm portion 153 of the terminal pin cover 150 is inserted into the groove 144 and pushed down, the claw portion 154 engages with the step portion 145 and the terminal pin cover 150 is attached to the terminal block portion 140. be done.

As shown in FIG. 3, a plurality of partition plates 155 extending in the radial direction are formed on the back surface of the top plate portion 151 of the terminal pin cover 150. When the terminal pin cover 150 is attached to the terminal block section 140, the partition plate 155 is inserted between the terminal pins 141, and the winding terminals 131 of the stator winding 130 connected to one end of the terminal pin 141 are separated. Prevent contact.

The flange portion 125 of the insulator 120 is provided with a plurality of coupling pins 128 that protrude upward in the axial direction and are located in the middle of the through hole 126a. The shield 160 is coupled to the insulator 120 using the coupling pin 128.

The shield 160 is an annular member made of a metal material (for example, a cold rolled steel plate), and includes a first annular portion 161 on the outer peripheral side, as shown in FIG. A cylindrical portion 162 is formed at the edge of the first annular portion 161 and extends downward in the axial direction. The axial length of the cylindrical portion 162 is set to be the same as the axial length of the stator core 110 plus the thickness of the flange portion 125 of the insulator 120, but may be larger than this length. A second annular portion 164 is formed on the inner peripheral side of the first annular portion 161 via a connecting portion 163 .

The second annular portion 164 is located upward in the axial direction with respect to the first annular portion 161, and the connecting portion 163 connecting the two is an upwardly sloped surface. A terminal block cover 166 is formed on one side of the connecting portion 163 and extends radially outward. The surface of the terminal block portion cover 166 and the surface of the second annular portion 164 are on the same plane. A circular opening 165 is formed in the center of the second annular portion 164 .

In the first annular portion 161, a plurality of circular first through holes 167 are formed concentrically in the circumferential direction. The first through hole 167 is arranged at a position corresponding to the through hole 113a formed in the flange 113 of the stator core 110 and the through hole 126a formed in the protrusion 126 of the insulator 120. Further, a plurality of circular second through holes 168 are formed in the first annular portion 161 concentrically in the circumferential direction. The second through hole 168 is arranged at a position corresponding to the coupling pin 128 formed on the flange portion 125 of the insulator 120.

2. Method for assembling resolver A plurality of coupling pins 128 formed on the flange portion 125 of the insulator 120 are each inserted into the second through hole 168 formed on the first annular portion 161 of the shield 160, and the connecting pins 128 protrude from the second through hole 168. The shield 160 is coupled to the stator core 100 by plastically deforming (thermal caulking) the tip of the coupling pin 128 (see FIG. 9). The deformed tip of the coupling pin 128 is located below the second annular portion 164 of the shield 160 and does not protrude from the second annular portion 164 in the axial direction.

At this time, the second annular portion 164 of the shield 160 is located above the stator winding 130, and there is a predetermined gap between the stator winding 130 and the second annular portion 164 (the back surface of the second annular portion 164). is formed so that the shield 160 does not come into contact with the stator winding 130.

The first annular portion 161 of the shield 160 is placed on the flange portion 125 of the insulator 120. In this way, since the flange portion 125 is disposed between the core back portion 111 of the stator core 110 and the first annular portion 161 of the shield 160, the shield 160 does not contact the stator core 110.

The second annular part 164 of the shield 160 covers the stator winding 130, the first annular part 161 of the shield 160 covers the core back part 111 of the stator core 110, and the terminal block cover 166 of the shield 160 covers the terminal block part 140. , the cylindrical portion 162 of the shield 160 surrounds the entire side surface of the stator core 110. As shown in FIG. 6, the side surface of the stator core 110 and the inner peripheral surface of the cylindrical portion 162 of the shield 160 have a predetermined gap in the radial direction so that they do not come into contact with each other.

The stator 100 equipped with the shield 160 is attached to the housing 20 with metal bolts 30. In this case, as shown in FIG. 8, a washer 31 can be interposed between the shield 160 and the bolt 30. The bolt 30 is inserted into the first through hole 167 formed in the first annular portion 161 of the shield 160 and the through hole 113a formed in the flange 113 of the stator core 110, and is screwed into the screw hole of the housing 20.

3. Effects When the motor rotates, magnetic flux is generated, and the magnetic flux directed toward the stator windings 130 is absorbed by the shield 160. In the resolver stator 100 having the above configuration, the insulating resin flange portion 125 of the insulator 120 is interposed between the core back portion 111 of the stator core 110 and the first annular portion 161 of the shield 160. It is possible to suppress the magnetic flux absorbed by the shield 160 from interlinking with the stator winding 130 via the core back portion 111. Since such an effect can be obtained by using the flange portion 125 that is a part of the insulator 120, an increase in manufacturing cost can be avoided.

The bolt 30 acts as an antenna and absorbs the magnetic flux generated by the motor, and the magnetic flux flows to the shield 160. In this regard, in the above embodiment, since the insulating resin flange portion 125 is present at the peripheral edge of the first through hole 167 of the shield 160 through which the bolt 30 is inserted, magnetic flux is prevented from flowing to the core back portion 111. be able to. Further, when the bolt 30 is inserted into the through hole 113a of the stator core 110, there is a predetermined gap in the radial direction so that the bolt 30 and the stator core 100 do not come into contact with each other, so that magnetic flux does not flow to the core back portion 111. can be prevented.

In the stator 100, since the cylindrical portion 162 of the shield 160 covers the core back portion 111, magnetic flux that attempts to enter from around the core back portion 111 can be shielded.

In the stator 100, since the second annular portion 164 of the shield 160 is spaced upward in the axial direction with respect to the stator winding 130, the magnetic flux absorbed by the shield 164 is suppressed from interlinking with the stator winding 130. be done.

In the stator 100, since the shield 160 includes the terminal block cover 166 that covers the terminal block part 140, the influence of the magnetic flux generated by the motor on the winding terminals 131 can be suppressed.

In the embodiment described above, since the insulator 120 is integrally molded with the stator core 110 as an insert material, when the coupling pin 128 of the insulator 120 is inserted into the second through hole 168 of the shield 160 and thermally caulked, the stator core 110 is also attached to the insulator 120. Workability is good because it is combined with

4. Modifications The present invention is not limited to the above-described embodiments, and various modifications can be made as described below.
i) The through hole 113a formed in the flange 113 of the stator core 110 and the through hole 126a formed in the protrusion 126 of the insulator 120 may be cutouts opened radially outward.

ii) In the above embodiment, the connector housing 142 is provided to insert a socket, but a structure in which a known lead wire is connected to the terminal pin 141 may also be used.

INDUSTRIAL APPLICATION This invention can be utilized for the resolver which detects the rotation angle of rotating electric machines, such as a motor.

DESCRIPTION OF SYMBOLS 1...Resolver, 10...Rotor, 11...Protrusion, 20...Housing, 30...Bolt, 31...Washer, 100...Stator, 110...Stator core, 111...Core back part (main body part), 112...Teeth, 113...Flange , 113a...Through hole (insertion part), 120...Insulator, 121...Winding part, 122...Body part, 123...Inner regulation part, 124...Outer regulation part, 125...Flange part, 126...Protrusion part, 126a...Penetration Hole, 127... Annular projection, 128... Coupling pin, 130... Stator winding, 131... Winding end, 140... Terminal block portion, 141... Terminal pin, 142... Connector housing, 143... Convex portion, 144... Groove, 145 ...Step part, 150...Terminal pin cover, 151...Top plate part, 152...Side plate part, 153...Arm part, 154...Claw part, 155...Partition plate, 160...Shield, 161...First annular part, 162...Cylindrical part , 163... Connecting portion, 164... Second annular portion, 165... Opening, 166... Terminal block cover, 167... First through hole, 168... Second through hole.

Claims (10)

a stator core including an annular main body and a plurality of teeth extending radially inward from a periphery of the main body;
an insulator provided in the stator core;
a stator winding wound around the plurality of teeth via the insulator;
a plurality of terminal pins to which terminals of the stator winding are connected;
a terminal block portion that holds the plurality of terminal pins;
an annular shield that covers the rotating electric machine side of the stator core;
In the stator of a resolver equipped with
The insulator includes a winding portion attached to the teeth and a flange portion extending radially outward from the winding portion,
The shield includes a first annular portion that covers the main body portion of the stator core, and a second annular portion that covers the stator winding wound around the teeth,
A stator of a resolver, wherein the flange portion of the insulator is interposed between the main body portion of the stator core and the first annular portion of the shield. The main body portion of the stator core includes a plurality of insertion portions for inserting bolts,
The resolver according to claim 1, wherein the first annular portion of the shield includes a plurality of first through holes for inserting the bolts, and the flange portion is interposed at a peripheral edge of the first through hole. stator. The resolver stator according to claim 1, wherein the shield includes a cylindrical portion that extends in the axial direction from a peripheral edge of the first annular portion and covers a side surface of the main body portion of the stator core. The flange portion of the insulator includes a plurality of coupling pins protruding in the axial direction, the first annular portion of the shield includes a plurality of second through holes through which the coupling pins pass, and the shield includes a plurality of second through holes through which the coupling pins pass. The resolver stator according to claim 1, wherein the coupling pin protruding from the second through hole is plastically deformed and coupled to the stator core. 5. The resolver stator according to claim 4, wherein the insulator is integrally formed with the stator core as an insert material. The resolver stator according to claim 1, wherein the shield includes a terminal block cover that covers the terminal block. 2. The resolver stator according to claim 1, wherein the main body portion of the stator core includes a plurality of flanges protruding radially outward, and the flanges include the insertion portion. The stator of the resolver according to claim 7, wherein the insertion portion is a through hole or a notch. The resolver stator according to claim 1, wherein the second annular portion of the shield is located further away from the stator core in the axial direction than the first annular portion. A resolver according to any one of claims 1 to 9, wherein a rotor connected to an output shaft of the rotating electric machine is disposed inside a stator of the resolver.

Images