stator and resolver

Abstract

To provide a stator capable of further improving angle detection accuracy.SOLUTION: A stator 1 comprises: a stator core 3 including a plurality of magnetic pole teeth 2A and 2B and a plurality of guide pieces 6; and a stator coil including a plurality of windings 4A and 4B and a plurality of crossovers 5. A slit 7 extending radially outside from the magnetic pole teeth 2A and 2B is formed between a pair of guide pieces 6. A direction of winding start of an electric wire of the first winding 4A is reverse to a direction of travel of the crossover 5 connected to a starting end of the first winding 4A. A direction of winding start of an electric wire of the second winding 4B is the same as a direction of travel of the crossover 5 connected to a starting end of the second winding 4B. A circumferential width of a slit 7A communicating to the first magnetic pole tooth 2A is smaller than a circumferential width of a slit 7B communicating to the second magnetic pole tooth 2B.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] This specification discloses a resolver and a resolver status. [Background technology]

[0002] Reluctance resolvers are known as resolvers for rotational angle sensors. A typical reluctance resolver stator includes a stator core and a stator coil. The stator core has multiple magnetic pole teeth, and the stator coil has windings that are wound around the magnetic pole teeth. Furthermore, the parts of the wire that electrically connect the windings to each other are called "jumpers." [Overview of the Initiative] [Problems that the invention aims to solve]

[0003] As mentioned above, the stator windings are constructed by winding wires around the magnetic pole teeth. Furthermore, the stator core typically has multiple magnetic pole teeth. If the length of the jumper wires differs significantly from one magnetic pole tooth to another, problems arise such as the degree of influence of disturbances differing for each magnetic pole tooth. As a result, there has been a problem of reduced angle detection accuracy in the resolver.

[0004] Therefore, this specification discloses a stator and resolver that can further improve angle detection accuracy. [Means for solving the problem]

[0005] A stator disclosed herein comprises a stator core including an annular yoke, a plurality of pole teeth projecting radially from the yoke, and a plurality of guide pieces projecting axially from the axial end face of the yoke, and a stator coil including a plurality of windings wound around the pole teeth and a plurality of jumper wires connecting the plurality of windings to each other, wherein the plurality of guide pieces are spaced apart in the circumferential direction to form slits extending radially outward from the pole teeth, and the plurality of pole teeth include one or more first pole teeth and one or more second pole teeth The invention relates to a pole tooth, wherein the plurality of windings include a first winding wound around the first pole tooth and a second winding wound around the second pole tooth, wherein the starting direction of the first winding is opposite to the direction of travel of the jumper wire connected to the starting end of the first winding, the starting direction of the second winding is the same as the direction of travel of the jumper wire connected to the starting end of the second winding, and the circumferential width of the slit connected to the first pole tooth is smaller than the circumferential width of the slit connected to the second pole tooth.

[0006] Other stators disclosed herein include a stator core comprising an annular yoke, a plurality of pole teeth projecting radially from the yoke, and a plurality of guide pieces projecting axially from the axial end face of the yoke, and a stator coil comprising a plurality of windings wound around the pole teeth, and a plurality of jumper wires connecting the plurality of windings to each other, wherein the plurality of guide pieces are spaced apart in the circumferential direction to form slits extending radially outward from the pole teeth, and the plurality of pole teeth include one or more first pole teeth and one or more second pole teeth, and the plurality of windings The wire includes a first winding wound around the first pole teeth and a second winding wound around the second pole teeth, wherein the starting direction of the first winding is opposite to the direction of travel of the jumper wire connected to the starting end of the first winding, the starting direction of the second winding is the same as the direction of travel of the jumper wire connected to the starting end of the second winding, and at least one of the jumper wires connected to the starting end of the first winding and the jumper wire connected to the end of the first winding travels in a detour that folds back in the circumferential direction within the slit.

[0007] In this case, the stator core further includes a guide projection that protrudes axially from the axial end face of the yoke within the slit, and at least one of the connecting wires that connect to the starting end of the first winding and the connecting wires that connect to the ending end of the first winding may be hooked onto the guide projection as it moves through the slit.

[0008] Furthermore, at least a portion of the plurality of guide pieces has a first end face which is the circumferential end face of the first slit, which is the slit connected to the first magnetic pole teeth, and in an axial view, the radial center of the first end face bulges toward the circumferential center of the first slit, and at least one of the connecting wires connected to the start end of the first winding and the connecting wires connected to the end end of the first winding may advance along the first end face as it moves through the first slit.

[0009] The resolver disclosed herein comprises the stator described above, a rotating shaft concentrically arranged with the stator, and a rotor fixed to the rotating shaft, having irregularities, and made of a magnetic material, and is characterized in that it detects the rotational position of the rotating shaft by detecting a change in reluctance between the rotor and the stator. [Effects of the Invention]

[0010] The technology disclosed herein can reduce variations in the wire length of jumper wires and improve the angle detection accuracy of resolvers. [Brief explanation of the drawing]

[0011] [Figure 1] This is a magnified perspective view of a portion of the stator. [Figure 2] This is a magnified plan view of a portion of the stator shown in Figure 1. [Figure 3] This is a magnified plan view of a portion of the stator of the comparative example. [Figure 4] Figures 2 and 3 illustrate the length of the wires in the stator. [Figure 5]This is a magnified perspective view of a portion of the status from another example. [Figure 6] Figure 5 is a magnified plan view of a portion of the stator. [Figure 7] This is a magnified plan view of a portion of the stator from another example. [Figure 8] This is a schematic diagram showing the position of the guide projections. [Figure 9] This is a magnified perspective view of a portion of the status from another example. [Figure 10] Figure 9 is an enlarged plan view of a portion of the stator. [Figure 11] This is a schematic diagram of a reluctance-type resolver. [Modes for carrying out the invention]

[0012] The reluctance type resolver will be described below with reference to the drawings. Figure 11 is a schematic diagram of a reluctance type resolver. As shown in Figure 11, the reluctance type resolver has a stator 1, a rotating shaft 30, and a rotor 32. The rotating shaft 30 is arranged concentrically with the stator 1. The rotor 32 is fixed to the rotating shaft 30 and rotates together with the rotating shaft 30. The rotor 32 is made of a magnetic material. In addition, irregularities 34 are formed on the outer circumferential surface of the rotor 32. The rotational position of the rotating shaft 30 is detected by detecting the change in reluctance between the rotor 32 and the stator 1.

[0013] Figure 1 is an enlarged perspective view of a portion of the stator 1 of a reluctance resolver. Figure 2 is a plan view of a portion of the stator 1. The stator 1 comprises a stator core 3 and a stator coil. The stator core 3 includes an annular yoke 10 and a plurality of pole teeth 2A, 2B (only a portion is shown) projecting radially from the yoke 10. In the following, when the pole teeth 2A and pole teeth 2B are not distinguished, the subscript alphabet will be omitted and they will be referred to as "pole teeth 2". The same will apply to other components. The pole teeth 2 include one or more first pole teeth 2A and one or more second pole teeth 2B.

[0014] The stator coil includes a plurality of windings 4A, 4B and a jumper wire 5 that connects the windings 4 to each other. The first winding 4A is wound around the first magnetic pole tooth 2A. The second winding 4B is wound around the second magnetic pole tooth 2B. The winding start direction of the first winding 4A is opposite to the traveling direction of the jumper wire 5 connected to the start end of the first winding 4A. The winding start direction of the second winding 4B is the same as the traveling direction of the jumper wire 5 connected to the start end of the second winding 4B. In other words, the jumper wire 5 connected to the start end of the first winding 4A does not cross the slit 7 in the circumferential direction during the process from the entrance of the slit 7 described later to the start end of the first winding 4A. Also, the jumper wire 5 connected to the start end of the second winding 4B obliquely crosses the slit 7 in the circumferential direction during the process from the entrance of the slit 7 to the start end of the second winding 4B.

[0015] A winding group is formed by connecting a plurality of windings 4 with the jumper wire 5. The jumper wire 5 is guided by a guide piece 6 arranged in an annular shape. The guide piece 6 protrudes axially from the axial end face of the yoke 10. The plurality of guide pieces 6 are formed at intervals in the circumferential direction. Also, the guide piece 6 is formed in substantially the same phase range as the slot of the stator core 3. And between two adjacent guide pieces 6 in the circumferential direction, a slit 7 is formed that extends radially outward from the magnetic pole tooth 2 and is for passing an electric wire through the magnetic pole tooth 2. The radially inner end of the guide piece 6 coincides with the radially inner end of the yoke 10, and the radially outer end of the guide piece 6 is located in the middle of the yoke 10 in the radial direction. The jumper wire 5 extends along the outer peripheral surface of the guide piece 6.

[0016] The slit 7 is divided into a first slit 7A for passing an electric wire through the first magnetic pole tooth 2A and a second slit 7B for passing an electric wire through the second magnetic pole tooth 2B. The slit width W1 of the first slit 7A is narrower than the slit width W2 of the second slit 7B. The reason for such a configuration will be described with reference to FIGS. 3 and 4.

[0017] FIG. 3 is an enlarged plan view of a part of the stator 1 in a reluctance type resolver of a comparative example. Also, FIG. 4 is a diagram for explaining the length of the electric wire in the reluctance type resolver shown in FIGS. 1 and 2.

[0018] As shown in Figure 3, the comparative stator 1, like those in Figures 1 and 2, has multiple guide pieces 6, and the stator core 3 has slits 7 extending radially outward from the pole teeth 2. However, in the comparative example, the width of each of the multiple slits 7 is the same as that of the first slit 7A connected to the first pole tooth 2A. That is, the width of the first slit 7A connected to the first pole tooth 2A is the same as the width of the second slit 7B connected to the second pole tooth 2B.

[0019] Here, let's assume that the angular spacing between multiple magnetic pole teeth 2 is θ. In this case, the area within θ / 2 on both sides of the circumferential center of one first magnetic pole tooth 2A is called the "first reference section S1". The length of the jumper wire 5 connected to the first winding 4A in this first reference section S1 is called the "first section wire length". Similarly, the area within θ / 2 on both sides of the circumferential center of one second magnetic pole tooth 2B is called the "second reference section S2". The length of the jumper wire 5 connected to the second winding 4B in this second reference section S2 is called the "second section wire length".

[0020] In the comparative example shown in Figure 3, the length of the wire in the first section differs significantly from the length of the wire in the second section. Specifically, the jumper wire 5 connected to the first pole tooth 2A travels straight radially through the first slit 7A. On the other hand, the jumper wire 5 connected to the second pole tooth 2B crosses the second slit 7B diagonally. Therefore, the length of the wire of the jumper wire 5 passing through the second slit 7B (and thus the length of the wire in the second section) is longer than the length of the wire of the jumper wire 5 passing through the first slit 7A (and thus the length of the wire in the first section). In other words, in the case of stator 1 in Figure 3, there is a difference in the length of the wires of the jumper wires 5. A resolver using such a stator 1 will experience a decrease in angle detection accuracy due to factors such as differences in the degree of influence of disturbances.

[0021] On the other hand, in the case of stator 1 shown in Figures 1 and 2, the slit width W1 of the first slit 7A is made smaller than the slit width W2 of the second slit 7B. This reduces variations in the wire length of the jumper wire 5 and reduces the difference between the wire length of the first section and the wire length of the second section. This will be explained with reference to Figure 4.

[0022] Let L1 be the length of the connecting wire 5 in the second slit 7B, and L2 be the length of the connecting wire in the first slit 7A. In this case, the narrowing width of the slit 7A relative to slit 7B can be expressed as L3 = (W2 - W1) ÷ 2.

[0023] By adjusting the narrowing width L3 of this slit, variations in the wire length of the jumper wire 5 can be reduced. For example, by setting the narrowing width L3 to a value that satisfies L2 + L3 ≈ L1, the wire length of the first section and the wire length of the second section can be made almost the same.

[0024] In other words, in Figure 3, the length of the second section of the power line was longer than the length of the first section of the power line because the jumper wire 5 diagonally crossed the second slit 7B. However, as shown in Figures 1 and 2, by making the slit width W1 of the first slit 7A narrower than the slit width W2 of the second slit 7B, it is possible to reduce the difference between the length of the first section of the power line and the length of the second section of the power line.

[0025] Next, another example of stator 1 will be described with reference to Figures 5 and 6. As shown in Figures 5 and 6, stator 1 has a stator core 3 and stator coils. The stator core 3 includes an annular yoke 10 and a plurality of magnetic pole teeth 2 (only a portion is shown) projecting radially from the yoke 10. The stator coils have a plurality of windings 4 wound around each of the magnetic pole teeth 2 and jumper wires 5 connecting the windings 4 to each other. A group of windings is formed by connecting multiple windings 4 with jumper wires 5. The jumper wires 5 are guided by annularly arranged guide pieces 6. Each guide piece 6 has a slit 7 near the magnetic pole teeth 2 for passing wires to the magnetic pole teeth 2.

[0026] The stator core 3 further has guide protrusions 8. The guide protrusions 8 are protrusions that axially protrude from the axial end surface of the yoke 10 within the slit 7. At least one of the jumper wires 5 connected to the start end of the first winding 4A and the jumper wire 5 connected to the end of the first winding 4A is hooked on the guide protrusion 8 during the process of advancing within the first slit 7A and then folded back in the circumferential direction. In other words, the jumper wire 5 connected to the first winding 4A advances along a path that is substantially V-shaped when viewed axially within the first slit 7A.

[0027] In the stator 1 of the comparative example shown in FIG. 3, when the wire is wound without being bent, the jumper wire 5 connected to the first winding 4A is shorter than the wire length of the jumper wire 5 connected to the second winding 4B because it travels straight through the first slit 7A. On the other hand, as shown in FIGS. 5 and 6, when the jumper wire 5 connected to the first winding 4A is hooked on the guide protrusion 8 to change the traveling direction of the wire, the difference between the first-section wire length and the second-section wire length becomes smaller compared to the comparative example.

[0028] Also, as shown in FIG. 7, only one of the jumper wire 5 connected to the start end of the first winding 4A and the jumper wire 5 connected to the end of the first winding 4A may be hooked on the guide protrusion 8. The method of determining the position of the guide protrusion 8 in this case will be described with reference to FIG. 8.

[0029] [[ID=`11]] As shown in FIG. 8, let the width of the slit 7A be L A and the radial dimension of the guide piece 6 be L B . Also, consider the case where a guide protrusion 8 of negligible size is provided at a position that is separated from the left guide piece 6 by a distance L C to the right and advances radially inward by L B / 2 from the outer peripheral surface of the guide piece 6. In this case, when the values L A , L B , L c satisfy the following formula 1, the first-section wire length becomes equal to the second-section wire length. Solving formula 1 gives formula 2. Since L C is greater than 0 and smaller than L A , it is possible to provide the guide protrusion 8 in the first slit 7A.

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[0030] For the sake of simplicity, the explanation was given using an example where the size of the guide projection 8 can be ignored. However, by appropriately designing the size, position, and number of the guide projection 8, it is possible to make the length of the first section of the wire the same as the length of the second section of the wire.

[0031] If the winding direction of each pole tooth 2 is not predetermined, it is advisable to provide the same guide projection 8 in all slits 7A and 7B, as shown in Figure 6. This way, regardless of which pole tooth 2 becomes the first pole tooth 2A, it is possible to hook the jumper wire 5, which is connected to at least one of the start and end ends of the first winding 4A, onto the guide projection 8.

[0032] The shape of the guide projection 8 may be modified as appropriate, as long as the jumper wire 5 can be caught inside the slit 7 and rerouted. For example, the guide projection 8 may be L-shaped, protruding from the guide piece 6. Similarly, if a recess is provided on the bottom surface of the slit 7, forming a relatively protruding portion, it can also be considered a guide projection 8 as the wire can be caught in it.

[0033] Next, we will describe another example of stator 1 with reference to Figures 9 and 10. Figure 9 is an enlarged perspective view of a portion of stator 1 in a reluctance resolver. Figure 10 is a plan view of the same stator 1 as in Figure 9.

[0034] The stator 1 includes a stator core 3 and stator coils. The stator core 3 has an annular yoke 10 and a plurality of magnetic pole teeth 2 (only partially shown) projecting radially from the yoke 10. The stator coils include a plurality of windings 4 wound around the plurality of magnetic pole teeth 2 and jumper wires 5 connecting the windings 4 to each other. A group of windings is formed by connecting a plurality of windings 4 with jumper wires 5. The jumper wires 5 are guided by annularly arranged guide pieces 6. The guide pieces 6 form slits 7 that extend radially from the magnetic pole teeth 2 near the magnetic pole teeth 2.

[0035] Here, the first slit 7A connected to the first pole tooth 2A is formed by two guide pieces 6 arranged circumferentially on either side of the first slit 7A. Both of these guide pieces 6 have a first end face 12A which is the circumferential end face of the first slit 7A. In an axial view, the radial center of this first end face 12A bulges toward the circumferential center of the first slit 7A.

[0036] At least one of the jumper wires 5 connected to the starting end of the first winding 4A and the jumper wire 5 connected to the end of the first winding 4A travels along the first end face 12A as it passes through the first slit 7A. As a result, the jumper wire 5 connected to the first winding 4A travels along a path that detours within the first slit 7A, folding back in a roughly V-shape in the circumferential direction. By changing the direction of travel of the jumper wires 5 in this way, the difference between the length of the first section of the wire and the length of the second section of the wire is reduced compared to the comparative example shown in Figure 3.

[0037] If the winding direction of the winding for each pole tooth 2 is not predetermined, the circumferential end faces of all slits 7A and 7B are made to have the same shape. In this way, regardless of which pole tooth 2 becomes the first pole tooth 2A, it is possible to pass the connecting wire 5 along the circumferentially bulging first end face 12A at at least one of the beginning and / or end of the first winding 4A.

[0038] Thus, with the stator 1 shown in Figures 9 and 10, by simply passing the jumper wire 5 along the shape of the guide piece 6 without causing it to sag, the effect of reducing the difference between the length of the first section of the power line and the length of the second section of the power line can be obtained.

[0039] Furthermore, if the stator 1 has the configuration of claim 1 or claim 2, other configurations may be modified as appropriate. For example, if the circumferential width of the first slit 7A connected to the first pole teeth 2A is smaller than the circumferential width of the second slit 7B connected to the second pole teeth 2B, the shape of the guide piece 6 may be modified as appropriate. Also, if the jumper wire 5 connected to the first winding 4A bends around inside the first slit 7A connected to the first pole teeth 2A so as to fold back in the circumferential direction, the shapes of the guide piece 6 and the guide projection 8 may be modified as appropriate. [Explanation of symbols]

[0040] 1 Stator, 2 Pole teeth, 2A First pole teeth, 2B Second pole teeth, 3 Stator core, 4 Winding, 4A First winding, 4B Second winding, 5 Jumper wire, 6 Guide piece, 7 Slit, 7A First slit, 7B Second slit, 8 Guide projection, 10 Yoke, 12 End face, 12A First end face, 30 Rotating shaft, 32 Rotor, 34 Concave and concave.

Claims

1. A stator core comprising an annular yoke, a plurality of magnetic pole teeth projecting radially from the yoke, and a plurality of guide pieces projecting axially from the axial end face of the yoke, A stator coil comprising a plurality of windings wound around the magnetic pole teeth, and a plurality of jumper wires connecting the plurality of windings to each other, Equipped with, The plurality of guide pieces are arranged at intervals in the circumferential direction so as to form a slit extending radially outward from the magnetic pole teeth. The plurality of magnetic pole teeth include one or more first magnetic pole teeth and one or more second magnetic pole teeth. The plurality of windings include a first winding wound around the first pole tooth and a second winding wound around the second pole tooth, The direction in which the first winding begins is opposite to the direction of travel of the jumper wire connected to the starting end of the first winding. The direction in which the wire of the second winding begins is the same as the direction of travel of the jumper wire connected to the starting end of the second winding. The circumferential width of the slit connected to the first pole tooth is smaller than the circumferential width of the slit connected to the second pole tooth. A stator characterized by the following features.

2. A stator core comprising an annular yoke, a plurality of magnetic pole teeth projecting radially from the yoke, and a plurality of guide pieces projecting axially from the axial end face of the yoke, A stator coil comprising a plurality of windings wound around the magnetic pole teeth, and a plurality of jumper wires connecting the plurality of windings to each other, Equipped with, The plurality of guide pieces are arranged at intervals in the circumferential direction so as to form a slit extending radially outward from the magnetic pole teeth. The plurality of magnetic pole teeth include one or more first magnetic pole teeth and one or more second magnetic pole teeth. The plurality of windings include a first winding wound around the first pole tooth and a second winding wound around the second pole tooth, The direction in which the first winding begins is opposite to the direction of travel of the jumper wire connected to the starting end of the first winding. The direction in which the wire of the second winding begins is the same as the direction of travel of the jumper wire connected to the starting end of the second winding. At least one of the connecting wires, one connected to the starting end of the first winding and the other connected to the end of the first winding, travels within the slit in a detour that folds back in the circumferential direction. The stator core further includes guide projections that protrude axially from the axial end face of the yoke within the slit, At least one of the connecting wires, which is connected to the starting end of the first winding and the connecting wires, which is connected to the end of the first winding, is hooked onto the guide projection as it moves through the slit. A stator characterized by the following features.

3. A stator according to claim 1 or 2, A rotating shaft arranged concentrically with the stator, A rotor fixed to the aforementioned rotating shaft, having irregularities, and made of a magnetic material, Equipped with, The rotational position of the rotating shaft is detected by detecting the change in reluctance between the rotor and the stator. A resolver characterized by the following features.

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