Motor

Abstract

To provide a motor capable of inhibiting breakage, wrinkle, etc. from occurring in the insulating paper.SOLUTION: A motor 1 includes: a rotor core 10 (iron core) provided with a plurality of slots 11 arranged in parallel in the circumferential direction of a rotation axis Ax; a plurality of coils 20 wound around the slots 11; and an insulating paper 30 having a first insulating part 31 positioned between one coil 20 in the circumferential direction among from the plurality of coils 20 and one end surface 11a of the slot 11 in the circumferential direction, a second insulating part 32 positioned between the other coil 20 in the circumferential direction and the other end surface 11b of the slot 11 in the circumferential direction, and a connecting part 33 provided with a crease 34 extending between the first insulating part 31 and the second insulating part 32 and expandable in the circumferential direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a motor. [Background technology]

[0002] Patent Document 1 describes a motor including a stator core having a plurality of slots, a plurality of coils wound around the slots, and insulating paper arranged between the plurality of coils. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-98995 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in this type of motor, for example, when a multi-pole coil is wound around a single sheet of insulating paper, there is a risk that the binding force of the coil may cause tears or wrinkles in the insulating paper, resulting in a decrease in its insulating function.

[0005] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide a motor that can prevent tears, wrinkles, etc. from occurring in the insulating paper. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, the motor of the present invention comprises a stator or rotor core having a plurality of slots arranged circumferentially around a rotating shaft, a plurality of coils wound around the slots, a first insulating portion positioned between one of a pair of circumferentially adjacent coils among the plurality of coils and one circumferential end face of the slot, a second insulating portion positioned between the other of the pair of coils and the other circumferential end face of the slot, and a connection portion extending between the first insulating portion and the second insulating portion and having a fold that is expandable and contractible in the circumferential direction. Effect of the Invention

[0007] According to the present invention, even if the insulating paper is subjected to tension or compression due to the binding force of the coil when the coil is wound, the folds expand and contract (deform) in the circumferential direction, thereby preventing tears, wrinkles, and the like from occurring in the insulating paper, and thus preventing a deterioration in the insulating function of the insulating paper. Furthermore, when the insulating paper is provided on the iron core of the rotor, for example, if the position of the coil is displaced due to the centrifugal force of the rotor's rotation, the insulating paper may be pulled out of alignment with the coil, causing tears. In this regard, according to the present invention, there is an advantage in that the folds expand and contract (deform) in the circumferential direction, preventing tears in the insulating paper, even if the position of the coil is displaced due to the centrifugal force of the rotor's rotation. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is an exemplary schematic plan view of the vicinity of insulating paper of a motor according to an embodiment. [Diagram 2] FIG. 2 is a schematic cross-sectional view illustrating an example of insulating paper of a motor according to a first modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Exemplary embodiments and modifications of the present invention are disclosed below. The configurations of the embodiments and modifications shown below, and the actions and effects brought about by the configurations, are merely examples. The present invention can be realized by configurations other than those disclosed in the following embodiments and modifications. Furthermore, according to the present invention, it is possible to obtain at least one of the various effects (including derivative effects) obtained by the configurations.

[0010] In addition, the embodiments and modifications disclosed below include similar components. Therefore, in the following, the similar components are given the same reference numerals, and duplicated explanations are omitted. Note that in this specification, ordinal numbers are used only to distinguish parts, members, parts, positions, directions, etc., and do not indicate order or priority.

[0011] [Embodiment] Fig. 1 is a plan view of the vicinity of the insulating paper 30 of the motor 1 of the embodiment. For convenience, the insulating paper 30 is hatched in Fig. 1. In the following description, for convenience, the axial direction of the rotating shaft Ax of the motor 1 will be simply referred to as the axial direction, the radial direction of the rotating shaft Ax will be simply referred to as the radial direction, and the circumferential direction of the rotating shaft Ax will be simply referred to as the circumferential direction. In the drawing, one of the circumferential directions is indicated by an arrow C.

[0012] The motor 1 shown in Fig. 1 is connected to the crankshaft of an internal combustion engine mounted on a vehicle, for example, via a belt. Therefore, the motor 1 and the crankshaft rotate in conjunction with each other. When the motor 1 rotates autonomously, the rotation is transmitted to the crankshaft, which rotates the crankshaft to start the internal combustion engine or assist the vehicle running. In addition, when the crankshaft rotates, the rotation is transmitted to the motor 1, which generates electricity.

[0013] The motor 1 also includes, for example, a rotor core 10 constituting a rotor, a rotor shaft 12, a coil 20, and insulating paper 30 (described later), as well as a stator and pulleys (not shown). The rotor shaft 12 is supported rotatably about a rotation axis Ax, and a pulley is provided at the tip of the rotor shaft 12. The above-mentioned belt is connected to this pulley. As a result, the rotation of the crankshaft is transmitted to the rotor shaft 12 via the belt. Conversely, the rotation of the rotor shaft 12 is transmitted to the crankshaft via the belt.

[0014] The rotor shaft 12 is inserted and fixed to the inner periphery of the rotor core 10. The coils 20 are wound around a plurality of slots 11 that axially penetrate the rotor core 10 and are arranged in the circumferential direction. The coils 20 are electrically connected to bus bars, slip rings, brushes, etc. (not shown) that are provided on the rotor shaft 12, and a current is supplied to the brushes from the motor control device. This current is supplied to the coils 20 via the brushes, slip rings, and wiring. As a result, a magnetic field is generated in the coils 20.

[0015] Next, the insulating paper 30 will be described in more detail. As shown in Fig. 1, the insulating paper 30 is composed of a single insulating sheet (film) made of an insulating material such as a synthetic resin material, and has a first insulating portion 31, a second insulating portion 32, and a connecting portion 33. The insulating paper 30 is attached inside the slots 11 of the rotor core 10. The insulating paper 30 is also called slot paper, etc.

[0016] The first insulating portion 31 is a portion of the insulating paper 30 that extends along one circumferential end surface 11a of the slot 11. The first insulating portion 31 is located, for example, between one of a pair of circumferentially adjacent N-pole and S-pole coils 20 and one end surface 11a of the slot 11. In other words, the N-pole or S-pole coil 20 on one side in the circumferential direction is wound around the first insulating portion 31.

[0017] The second insulating portion 32 is a portion of the insulating paper 30 that extends along the other circumferential end surface 11b of the slot 11. The second insulating portion 32 is located, for example, between the other circumferential coil 20 of a pair of circumferentially adjacent N-pole and S-pole coils 20 and the other circumferential end surface 11b of the slot 11. In other words, the other circumferentially adjacent S-pole or N-pole coil 20 is wound around the second insulating portion 32.

[0018] The connecting portion 33 is a portion of the insulating paper 30 that extends between the first insulating portion 31 and the second insulating portion 32. The connecting portion 33 extends along the radially inner end face 11c of the slot 11. The connecting portion 33 connects portions (end portions) of the first insulating portion 31 and the second insulating portion 32 that are shifted radially inward from the portion around which the coil 20 is wound.

[0019] The connecting portion 33 is provided with a fold 34 that is stretchable in the circumferential direction. The fold 34 is, for example, folded (bent) in a state that is convex radially outward from a portion of the connecting portion 33 that extends along the end face 11c. That is, the connecting portion 33 is stretchable in the circumferential direction by the fold 34 (excess length portion) that is folded from the portion that extends along the end face 11c. The fold 34 is also referred to as a folded portion, an excess length portion, or the like.

[0020] As described above, in this embodiment, the motor 1 comprises a rotor core 10 (iron core) having a plurality of slots 11 arranged circumferentially about the rotation axis Ax, a plurality of coils 20 wound around the slots 11, a first insulating portion 31 positioned between one of the plurality of coils 20 in the circumferential direction and one end face 11a of the slot 11 in the circumferential direction, a second insulating portion 32 positioned between the other coil 20 in the circumferential direction and the other end face 11b of the slot 11 in the circumferential direction, and insulating paper 30 having a connection portion 33 that extends between the first insulating portion 31 and the second insulating portion 32 and has a fold 34 that is stretchable in the circumferential direction.

[0021] According to this configuration, even if the insulating paper 30 is subjected to tension or compression due to the binding force of the coil 20 when the coil 20 is wound, the folds 34 expand and contract (deform) in the circumferential direction, thereby preventing tears, wrinkles, and the like from occurring in the insulating paper 30, and thus preventing a deterioration in the insulating function of the insulating paper 30. Furthermore, when the insulating paper 30 is provided on the rotor core 10, for example, if the position of the coil 20 is displaced due to the centrifugal force of the rotor core 10, the insulating paper 30 may be pulled out of alignment with the coil 20, causing tears. In this regard, according to this embodiment, there is an advantage that the folds 34 expand and contract (deform) in the circumferential direction, preventing tears from occurring in the insulating paper 30, even if the position of the coil 20 is displaced due to the centrifugal force of the rotor core 10.

[0022] The shape of the insulating paper 30 is not limited to this example, and may be, for example, as in insulating paper 30A of a first modified example shown in Fig. 2, in which folds 34A are folded radially outward from a portion of connecting portion 33 that extends along end face 11c. Connecting portion 33 can expand and contract in the circumferential direction due to folds 34A (excess length portion) that are folded from the portion that extends along end face 11c. Folds 34A are also referred to as folded portions, etc. Also, insulating paper 30 is not limited to being provided on rotor core 10, and may be provided on a stator core.

[0023] Although the embodiment and the modified examples of the present invention have been illustrated above, the above-mentioned embodiment and the modified examples are merely examples and are not intended to limit the scope of the invention. The above-mentioned embodiment and the modified examples can be implemented in various other forms, and various omissions, substitutions, combinations, and modifications can be made without departing from the gist of the invention. In addition, the specifications of each configuration, shape, and the like (structure, type, direction, type, size, length, width, thickness, height, number, arrangement, position, material, etc.) can be appropriately changed and implemented. [Explanation of symbols]

[0024] 1. Motor 10...Rotor core (iron core) 11. Slots 11a...One end surface 11b...Other end surface 20…Coil 30,30A…insulating paper 31…First insulation section 32…Second insulating part 33…Connection 34…Fold Ax...Rotation axis C…Circumferential direction

Claims

[Claim 1] a stator or rotor core having a plurality of slots arranged in a circumferential direction of a rotating shaft; A plurality of coils wound in the slots; an insulating paper including: a first insulating portion positioned between one of a pair of coils adjacent in the circumferential direction among the plurality of coils and one end surface of the slot in the circumferential direction; a second insulating portion positioned between the other of the pair of coils and the other end surface of the slot in the circumferential direction; and a connection portion extending between the first insulating portion and the second insulating portion and having a fold that is expandable and contractible in the circumferential direction; Equipped with The fold is folded radially outward relative to a portion of the connection portion that extends along a radially inner end face of the slot.

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