JP6804699B1 - Stator and rotary machine using it - Google Patents

Abstract

A plurality of stator slots formed between a stator core (2) having a plurality of stator teeth (6) in the circumferential direction with respect to the center of rotation of the rotary electric machine (100) and the stator teeth (6). The stator coil (3) arranged on the side of each bottom (5a) of (5) and the stator coil (3) arranged on each open side of the plurality of stator slots (5) have the same radial polarity. A stator magnet (4) is provided, and in each stator slot (5), a plate-shaped wedge (7) is provided between the stator coil (3) and the stator magnet (4). It is provided so as to be fitted to two facing wall surfaces (5b) of the slot (5), and the stator magnet (4) is adhered and fixed to the wedge (7).

Description

The present application relates to a stator and a rotary electric machine using the stator.

Conventionally, a mechanical transmission in which a rotating electric machine is connected to a rotating shaft provided at the center of rotation to reduce the rotation of the rotating electric machine has been used for applications requiring low-speed drive. When a mechanical transmission is used, mechanical wear and the like occur on the transmission, so that regular maintenance is required. On the other hand, a rotary electric machine capable of shifting the rotation speed of a rotor in a non-contact manner is disclosed as a magnetic strain wave gearing device or a magnetic geared generator (see, for example, Patent Document 1).

The magnetic wave gearing device shown in Patent Document 1 has a stator from the outer peripheral side, a first rotor that rotates at a low speed, and a second rotor that rotates at a high speed according to a gear ratio, about a rotation axis. To be equipped. The stator has a stator coil that can output generated power or control the generated torque. When this rotary electric machine is used, the rotation speed of the rotor can be changed without contact, so maintenance due to mechanical wear or the like is unnecessary, and the load of maintenance can be reduced. Further, if this rotary electric machine is used as a generator, it is possible to shift and generate power with one rotary electric machine without a mechanical transmission, and the power generation system can be miniaturized and space can be saved.

JP-A-2016-135014

In the structure of the rotary electric machine in Patent Document 1, the stator has a stator core provided with a plurality of stator slots, and both the stator coil and the stator magnet are stored in each stator slot. Therefore, one rotary electric machine can perform both shifting and power generation. Further, a chip portion made of a magnetic material as a back yoke is provided on a part of the stator coil side of the stator magnet so as to project from the wall surface of the stator slot to increase the output. However, since the stator magnets arranged on the open side of the stator slot are not provided with means for fixing the stator magnets, there is a problem that problems such as the stator magnets coming off occur.

When the tip portion is provided, the stator coil can be fixed to the bottom side of the stator slot. However, since it is difficult to insert the stator coil into the stator slot by providing the tip portion, there is a problem that the workability of the stator is deteriorated. If the tip is not provided, the stator coil can be easily inserted into the stator slot, but the stator coil is not fixed on the bottom side of the stator slot, so the stator coil moves to the open side. was there. Also, if the stator coil is not fixed on the bottom side of the stator slot, the insulation coating of the stator coil will be damaged by the friction when the stator coil moves, and the insulation of the stator coil will deteriorate. There was a problem that reliability was impaired.

The present application has been made to solve the above-mentioned problems, and an object of the present application is to obtain a stator in which a stator magnet and a stator coil in a stator slot are fixed in a stator slot by a simple manufacturing process. And.

The stator disclosed in the present application includes a stator core provided with a plurality of stator teeth in the circumferential direction with respect to the center of rotation of the rotary electric machine, and a plurality of stator slots formed between the stator teeth. A stator coil arranged on the bottom side of the stator and a stator magnet arranged on the open side of each of the plurality of stator slots and having the same polarity in the radial direction are provided. In the slot, a plate-shaped wedge is provided between the stator coil and the stator magnet so as to be fitted to two opposing wall surfaces of the stator slot , and each stator slot is on the bottom side. A plurality of the wedges are provided on the side opened from the front, and the stator magnet is fixed by adhering to the wedge arranged on the most open side among the plurality of the wedges.

According to the stator disclosed in the present application, the stator magnet and the stator coil in the stator slot can be fixed to the stator slot by a simple manufacturing process.

It is a schematic diagram which shows the cross section of the rotary electric machine which concerns on Embodiment 1. FIG. It is a schematic diagram which shows the main part of the rotary electric machine which concerns on Embodiment 1. FIG. It is a schematic diagram which shows the cross section of the stator slot of the rotary electric machine which concerns on Embodiment 1. FIG. It is a schematic diagram which shows the cross section of the stator slot of the rotary electric machine which concerns on Embodiment 2. FIG. It is a schematic diagram which shows the main part of the rotary electric machine which concerns on Embodiment 3.

Hereinafter, a stator according to the embodiment of the present application and a rotary electric machine using the stator will be described with reference to the drawings. In each figure, the same or corresponding members and parts will be described with the same reference numerals.

Embodiment 1.
FIG. 1 is a schematic view showing a cross section of the rotary electric machine 100, and FIG. 2 is a schematic view showing a main part of the rotary electric machine 100. FIG. 2 is an enlarged view of a portion surrounded by a broken line in FIG. As shown in FIG. 1, the rotary electric machine 100 is an annular stator 1 surrounding the rotating shaft 40, which is the center of rotation of the rotary electric machine 100, and a first rotor coaxially provided with the stator 1. It includes a low-speed rotor 20 and a high-speed rotor 30 which is a second rotor facing the low-speed rotor 20 and coaxially provided with the low-speed rotor 20. First, the general structure and operation of the magnetic geared generator as the rotary electric machine 100 will be described.

As shown in FIG. 2, the stator 1 includes a stator core 2, a stator coil 3, and a stator magnet 4. The annular stator core 2 includes a plurality of stator teeth 6 at equal intervals in the circumferential direction with respect to the center of rotation of the rotary electric machine 100. The plurality of stator slots 5 formed between the stator teeth 6 each include a stator coil 3 and a stator magnet 4. The stator coil 3 is arranged on the side of the bottom portion 5a of the stator slot 5. The stator magnet 4 is arranged on the open side of the stator slot 5. The stator magnets 4 are all magnetized in the same radial direction. The stator magnet 4 is, for example, a neodymium sintered magnet, but is not limited thereto. Assuming that the inner diameter side of the stator magnet 4 is N pole, the inner diameter side of the adjacent stator teeth 6 is S pole, and the same number of pole logarithm Ns as the number of stator slots 5 is formed.

The low-speed rotor 20 is provided on the inner peripheral side of the stator 1 so as to face the stator magnet 4 through a minute gap. The low-speed rotor 20 has a plurality of magnetic pole pieces 21 arranged at equal intervals in the circumferential direction, and rotates at a low speed by power from the outside. The number of the magnetic pole pieces 21 is NL. The high-speed rotor 30 is provided on the inner peripheral side of the low-speed rotor 20. The high-speed rotor 30 has a plurality of permanent magnets, high-speed rotor magnets 31, at equal intervals on the outer peripheral portion, and a pole pair of Nh is formed.

If the relationship of Ns, NL, and Nh satisfies NL = Ns ± Nh, a negative torque is generated in the low-speed rotor 20 due to the interaction of the magnetic forces of the stator magnet 4 and the high-speed rotor magnet 31. On the other hand, by rotating the low-speed rotor 20 by an external power, an input can be obtained from the low-speed rotor 20. If a stator current is passed through the stator coil 3 so as to free run the high-speed rotor 30 with respect to the input of the low-speed rotor 20, the high-speed rotor 30 has a rotation speed that is NL / Nh times that of the low-speed rotor 20. Rotate. When the high-speed rotor 30 rotates at NL / Nh double speed of the low-speed rotor 20, an induced electromotive force is generated in the stator coil 3. Due to the generation of the induced electromotive force, the generated power is output from the stator coil 3.

The internal configuration of the stator slot 5, which is the main part of the present application, will be described. FIG. 3 is a schematic view showing a cross section of the stator slot 5 of the rotary electric machine 100 according to the first embodiment. Each stator slot 5 includes a stator coil 3, a stator magnet 4, and a wedge 7. The plate-shaped wedge 7 is provided between the stator coil 3 and the stator magnet 4 so as to be fitted with a notch 5c of two facing wall surfaces 5b of the stator slot 5. The wedge 7 is made of, for example, a resin, but the material of the wedge 7 is not limited to this. The stator coil 3 and the stator magnet 4 face each other via a wedge 7. The stator magnet 4 is magnetized so as to have the same polarity in the radial direction. For example, the direction of the arrow shown in FIG. 3 is the direction of magnetism.

By fitting and fixing the wedge 7 with the notch portion 5c, the stator coil 3 is stably fixed at the bottom portion 5a of the stator slot 5. The stator magnet 4 is adhered to and fixed to the wedge 7. The adhesive 10 for adhering the stator magnet 4 is, for example, an epoxy-based adhesive, but the adhesive is not limited to this.

In the manufacturing process of the stator 1, the wedge 7 is provided by inserting the stator coil 3 into the stator slot 5 and then inserting the stator coil 3 into the notch 5c from the axial direction perpendicular to the paper surface. Therefore, the wedge 7 does not prevent the stator coil 3 from being inserted into the stator slot 5, and the stator coil 3 can be easily inserted into the stator slot 5. Further, since the wedge 7 is provided by fitting, the wedge 7 can be easily installed in the stator slot 5, and the stator coil 3 is easily fixed in the stator slot 5. Since the stator magnet 4 is fixed by adhering to the wedge 7 provided between the stator coil 3 and the stator magnet 4 instead of the side of the opening of the stator slot 5, the stator magnet 4 rotates at a low speed. It is fixed close to the child and the high speed rotor (not shown in FIG. 3). By bringing the stator magnet 4 close to the low-speed rotor and the high-speed rotor, the generated torque can be increased.

As described above, since the stator 1 according to the first embodiment adheres the stator magnet 4 to the wedge 7 and fixes the stator magnet 4, problems such as the stator magnet 4 falling off are suppressed, and a simple manufacturing process is performed. The stator magnet 4 can be fixed in the stator slot 5. Further, since the stator coil 3 can be easily inserted into the stator slot 5, the stator 1 can be manufactured by a simple manufacturing process. Further, since the wedge 7 is provided by fitting, the stator 1 can be manufactured by a simple manufacturing process. Further, the stator coil 3 can be fixed to the stator slot 5 by a simple manufacturing process.

Embodiment 2.
The stator 1 according to the second embodiment will be described. FIG. 4 is a schematic view showing a cross section of the stator slot 5 of the rotary electric machine 100. The stator 1 according to the second embodiment has a configuration in which a plurality of wedges are provided between the stator coil 3 and the stator magnet 4.

The stator slot 5 includes a stator coil 3, a stator magnet 4, and a plurality of wedges between the stator coil 3 and the stator magnet 4. Each stator slot 5 is provided with a plurality of wedges on the side opened from the side of the bottom portion 5a, and the stator magnet 4 is adhered to and fixed to the wedge arranged on the most open side of the plurality of wedges. Here, as a plurality of wedges, two wedges, a wedge 7 and a wedge 8, are provided. The plate-shaped wedges 7 and 8 are provided so as to be fitted with notches 5c of two facing wall surfaces 5b of the stator slot 5. The wedge 7 and the wedge 8 are made of, for example, a resin, but the materials of the wedge 7 and the wedge 8 are not limited to this.

By providing the plurality of wedges, the reliability of the mechanical strength in the stator slot 5 is improved because the fixing of the stator coil 3 and the stator magnet 4 does not depend on the strength of one wedge. Although the installation of two wedges has been described, the same effect can be obtained even if three or more wedges are provided.

It is desirable that the wedge 7 and the wedge 8 are not provided close to each other, but are provided apart from each other via the space portion 9 as shown in FIG. The temperature of the stator magnet 4 may rise due to the influence of heat generated by the Joule loss of the stator coil 3 through which an electric current flows. When the temperature of the stator magnet 4 rises, the stator magnet 4 has a characteristic that the residual magnetic flux density decreases as the temperature rises. Therefore, when the temperature rises, the magnetic force decreases and the performance of the stator 1 decreases. Deteriorates. Since the heat insulating effect can be expected by providing the space portion 9 which is an air layer, it is possible to suppress the temperature rise of the stator magnet 4 due to the heat generation of the stator coil 3.

As described above, since the stator 1 according to the second embodiment includes a plurality of wedges 7 and 8, the reliability of the mechanical strength in the stator slot 5 can be improved. Further, when the wedge 7 and the wedge 8 are provided apart from each other, the temperature rise of the stator magnet 4 due to the heat generated by the stator coil 3 can be suppressed.

Embodiment 3.
In the third embodiment, the rotary electric machine 100 using the stator 1 described in the first embodiment will be described. FIG. 5 is a schematic view showing a main part of the rotary electric machine 100. The rotary electric machine 100 according to the third embodiment has a configuration in which a plate-shaped wedge 7 is provided between the stator coil 3 and the stator magnet 4 in the stator slot 5.

As shown in FIG. 5, the rotary electric machine 100 has an annular stator 1 surrounding a rotation axis (not shown) which is the center of rotation of the rotary electric machine 100, and a plurality of magnetic pole pieces 21. It has a low-speed rotor 20 which is a first rotor and is provided coaxially with the stator 1 so as to face 4 and a high-speed rotor magnet 31 which is a plurality of permanent magnets, and faces the low-speed rotor 20. It includes a high-speed rotor 30 which is a second rotor provided coaxially with the low-speed rotor 20. The stator 1 includes a stator core 2, a stator coil 3, a stator magnet 4, and a wedge 7. The annular stator core 2 includes a plurality of stator teeth 6 at equal intervals in the circumferential direction with respect to the center of rotation of the rotary electric machine 100. A stator slot 5 is formed between the stator teeth 6. The wedge 7 is provided between the stator coil 3 and the stator magnet 4 so as to be fitted with a notch 5c of two facing wall surfaces 5b of the stator slot 5. In the manufacturing process of the stator 1, the wedge 7 is provided by inserting the stator coil 3 into the stator slot 5 and then inserting the stator coil 3 into the notch 5c from the axial direction perpendicular to the paper surface.

As described above, since the rotary electric machine 100 according to the third embodiment is provided with the wedge 7 and the stator magnet 4 is adhered to and fixed to the wedge 7, problems such as the stator magnet 4 falling off are suppressed. The stator magnet 4 can be fixed in the stator slot 5 by a simple manufacturing process, and the rotary electric machine 100 can be manufactured by a simple manufacturing process. Further, since the stator coil 3 can be easily inserted into the stator slot 5, the stator coil 3 can be fixed to the stator slot 5 in a simple manufacturing process, and the rotary electric machine 100 can be installed in the simple manufacturing process. Can be made. Further, since the wedge 7 is provided by fitting, the stator coil 3 can be fixed to the stator slot 5 in a simple manufacturing process, and the rotary electric machine 100 can be manufactured in a simple manufacturing process.

In the above, the rotary electric machine 100 using the stator 1 described in the first embodiment has been described, but the rotary electric machine 100 using the stator 1 described in the second embodiment also has a rotary electric machine with a simple manufacturing process. 100 can be made. Further, the same effect can be obtained with a generator and a motor provided with a stator 1 having the same configuration as that of the present application. Further, although the rotary electric machine 100 in which the stator 1 is on the outermost circumference is described above, the arrangement of the stator 1 is not limited to the outermost circumference, and the stator 1 is an outer rotor type rotary electric machine on the innermost circumference. It doesn't matter if there is. When the stator 1 is provided on the innermost circumference, the stator core is provided with a plurality of stator slots opened toward the outer peripheral side of the rotary electric machine in the circumferential direction.

The present application also describes various exemplary embodiments and examples, although the various features, embodiments, and functions described in one or more embodiments are those of a particular embodiment. It is not limited to application, but can be applied to embodiments alone or in various combinations.
Therefore, innumerable variations not illustrated are envisioned within the scope of the techniques disclosed herein. For example, it is assumed that at least one component is modified, added or omitted, and further, at least one component is extracted and combined with the components of other embodiments.

1 Stator, 2 Stator iron core, 3 Stator coil, 4 Stator magnet, 5 Stator slot, 5a bottom, 5b wall surface, 5c notch, 6 Stator tooth, 7 wedge, 8 wedge, 9 space part, 10 Stator, 20 Low speed rotor, 21 magnetic pole piece, 30 high speed rotor, 31 high speed rotor magnet, 40 rotation shaft, 100 rotation electric machine

Claims (2)

A stator core with multiple stator teeth in the circumferential direction with respect to the center of rotation of the rotating electric machine,
A stator coil arranged on the bottom side of each of the plurality of stator slots formed between the stator teeth, and a stator coil.
A stator magnet, which is arranged on the open side of each of the plurality of stator slots and has the same polarity in the radial direction, is provided.
In each of the stator slots
A plate-shaped wedge is provided between the stator coil and the stator magnet so as to be fitted to two facing wall surfaces of the stator slot.
Each of the stator slots has a plurality of the wedges on the side that opens from the bottom side.
A stator characterized in that the stator magnet is adhered and fixed to a wedge arranged on the most open side of the plurality of wedges . A stator according to claim 1,
A first rotor having a plurality of magnetic pole pieces and provided coaxially with the stator and facing the stator magnet.
A rotary electric machine having a plurality of permanent magnets and provided with a second rotor facing the first rotor and provided coaxially with the first rotor.

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