WO1997010640A1 - Rotary electric machine - Google Patents

Abstract

A rotary electric machine of a split type stator core system comprises a stator core (3A) including a first core member (31) and a second core member (32). The two core members are combined on a stator coil (3B) that is wound and shaped in advance, and they are joined using an adhesive containing fine magnetic particles. When a stator core is assembled by bonding a plurality of core members, air gaps usually remain between them. According to the present invention, however, the adhesive containing fine magnetic particles is packed into the gap, and this is magnetically equivalent to the state where no gap exists. As a result, the increase in reluctance resulting from split cores can be sufficiently restricted.

Description

 m Itoda rotary electric machine

 Technical field

 The present invention relates to a rotating electric machine having a laminated stator core, such as an induction motor or a synchronous machine, and more particularly to a rotating electric machine suitable for a relatively small-capacity general-purpose induction motor.

Background art

 Among rotating electric machines, a relatively small-capacity general-purpose induction senile motor having a structure as shown in Fig. 6 has been generally used.

 In the induction motor shown in FIG. 6, reference numeral 1 denotes a housing, which is also called a frame or a frame. The housing 1 is formed almost in a shape of a ferrous material such as iron or a light alloy material such as aluminum. It constitutes the motor casing.

 L a is a heat radiating fin which has a strip shape extending in the axial direction and is formed radially on the outer periphery of the housing 1 by integral construction with the housing 1.

 2 A and 2 B are end brackets, also called bearing brackets, which store the bearings 4 A and 4 B so that they can be attached to both ends of the no. It has become.

 Reference numeral 3 denotes a stator, which is wound around a stator core 3A made by laminating thin sheets of silicon sales plates and a plurality of slots provided on the inner periphery of the stator core 3A. And the stator coil 3B.

 The stator core 3A is obtained by cutting a thin silicon sales plate into a shape as shown in Fig. 7, such as punching with a breath, etc., and laminating it to a predetermined thickness. A tooth portion (teeth portion) 3D serving as a magnetic path is formed on the inner peripheral portion of the slot, thereby forming a slot 3C, thereby forming a slot 3C. As described above, the stator coil 3 B is wound on C.

Reference numeral 5 denotes a rotor having a rotating shaft 6, and the rotating shaft 6 is rotatably held by bearings 4A and 4B of end brackets 2A and 2B. 3 in It is configured to rotate at a predetermined position opposite to the stator 3.

 In such a conventional motor, the stator 3 is inserted into the housing 1 in advance and attached to the inner peripheral wall thereof, and then the rotor 5 is inserted into the stator 3. Then, with the bearings 4 A and 4 B fitted to the rotating shaft 6, the end brackets 2 A and 2 B are fitted to both ends of the housing 1, respectively. A plurality of bolts (not shown) are attached to the housing 1 for mounting and assembling.

 One end (right side in the figure) of the rotating shaft 6 protrudes outside through the bearing 4B of the end bracket 2A to form an output shaft, while the other end (left side) is The outer fan 9 (external cooling fan) is attached to the part of the end bracket 2A protruding from the bearing 4A.

 Reference numeral 10 denotes an end cover, which forms a cover for covering the outer fan 9. The end cover 10 is provided with a ventilation hole 10a serving as a ventilation inlet for taking in outside air by the outside fan 9, and the opening 10a is provided with a ventilation hole. The opposite side is formed in an open cylindrical or irregular circular shape, which comprises a radial gap 10b between the re-end bracket 2A and the outer diameter of the housing 1. A ventilation outlet is formed.

 Then, when the outer fan 9 is rotated by the rotor 5, outside air is sucked in from the ventilation inlet 10a of the end cover 10 and is blown out from the gap 10b. This allows the outside air to flow through the outer bracket 2A and the outer surfaces of the housing 1 and the end bracket 2B, thereby providing a cooling effect.

 The rotor 5 is mounted in the housing 1 of the rotating shaft 6 at a position facing the stator 2 as described above. The rotor 5 has a secondary conductor bar (not shown). In addition, an end ring 7 is provided, and an inner fan 8 (internal cooling fan) is formed integrally with the end ring 7.

The fan 8 consists of a plurality of blade blades protruding in the axial direction from the end face of the end ring 7, which can circulate air inside the motor and provide a cooling function. I am trying to get it. That is, the air flow generated by the inner fan 8 passes while cooling the rotor 5, the end ring 7, the stator coil 3B, and both end faces of the stator core 3A while cooling the housing. This allows heat to be obtained when passing along the inner surfaces of the end brackets 2A and 2B, which have a relatively low temperature rise as compared with 1.

 As a known example of this kind, there is, for example, one described in Japanese Patent Application Laid-Open No. Sho 61-251440.

 At this point, a small rotating electric machine! : Conversion is always a big proposition.Therefore, various miniaturization methods have been proposed. One example is the occupation of the stator coil in the stator slot. By increasing the product moment, that is, the ratio of the total cross-sectional area of the coil wire that can be stored in the stator slot to the stator slot face ridge, the size of the rotating electric machine can be reduced. There are ways to get it.

 As one technique for improving the occupation ratio, the stator core is divided into a plurality of stator cores so that the teeth forming the slots of the stator core are separated. The stator coil is made by dividing it into parts, and the stator core is combined with the stator coil that has been wound and shaped in advance, and then joined together to assemble the stator. Conventionally, there has been known a method using a so-called split-type stator core so as to improve coil storage.

 In this method, as shown in Fig. 5, first, the stator core 3A is separated by a slot along the circumferential direction of the circular yoke (yoke). The core portion 3 ′, that is, the divided core member, is made of an iron plate having a small number of layers, and is wound on the stator core slot in advance. Prepare the shaped stator coil 3B, and separate the stator coil 3B so that the stator coil 3B is stored in the slot from the inner diameter side of the stator core. The assembled iron cores are combined and joined to assemble the stator 3.

In FIG. 5, 33 c and 33 d are the coil ends of the stator coil 3 B, and these coil ends 33 c and 33 d are the stator coils. When the coil 3B is inserted into the slot 3C of the stator core 3A and is assembled, as shown in the figure, the stator core 3A respectively has one end in the axial direction and the other end face in the other direction. _T will be exposed By the way, if the iron core is divided in this way, the magnetic circuit by the iron core is also divided.

 On the other hand, once the iron core is divided in this way, it is unavoidable that a gap is formed in the assembled and joined parts thereafter. This means that although the dimensional accuracy can be reduced by increasing the dimensional accuracy, the gap itself cannot be eliminated.

 In the prior art, however, no special consideration has been given to the remaining of the gap, and as a result, this is equivalent to the formation of a new gap by the divided portion in the magnetic circuit of the rotating electric machine. However, the addition of magnetic resistance is caused by the division of the iron core.

 Therefore, in the prior art, it is necessary to increase the dimensional accuracy of the stator core, but even if it is, it is unavoidable to increase the magnetic resistance by dividing the stator core, and to maintain the same number of magnetic fluxes. However, a large magnetomotive force is required. As a result, the excitation current is increased and the power factor is reduced, resulting in a problem that the performance of the rotating electric machine is reduced.

 SUMMARY OF THE INVENTION An object of the present invention is to sufficiently address the above-mentioned problems of the prior art, and it is possible to sufficiently suppress the increase in magnetic resistance accompanying the division of the stator core without significantly improving the dimensional accuracy of the core. An object of the present invention is to provide a small and light rotating electric machine with good performance. Disclosure of the invention

 According to the present invention, a stator core is divided into a plurality of core members, and the stator core is assembled in advance by combining the core members with a stator coil that has been wound and shaped in advance. In a rotating electric machine of a split stator core type, an adhesive containing magnetic fine particles is interposed on a joint surface between the core members.

When a stator core is assembled by joining a plurality of core members, it is inevitable that a gap will remain at the joint and a void will be formed. According to this, since the gap is filled with the adhesive containing the magnetic fine particles, it is magnetically equivalent to the absence of a void, and as a result, the magnetic resistance accompanying the division is reduced. The increase can be suppressed sufficiently.

 As the material of the magnetic fine particles, it is desirable to use a magnetic material having a high magnetic permeability such as permalloy, for example, and the particle size is preferably 10 / imm or less.

 It is preferable to use an epoxy-based or silicon-based adhesive in order to easily form a layer of magnetic fine particles on the end face of the iron core member.

 Depending on the performance required of the rotating turtle machine, ferrite-based iron powder may be used as the magnetic fine particles, but even in this case, the particle size of the iron powder is 10 / mm or less. Is good.

 When the magnetic fine particles are made of the above-mentioned material, the magnetic flux can pass well, but the iron loss represented by the hysteresis loss is much smaller than that of the silicon steel sheet. There is almost no widespread decline in performance due to.

 The adhesive containing the magnetic fine particles is preferably applied in advance to the joint surface of the iron core member. Then, when the joint surfaces are assembled together, the adhesive is attached to the end surfaces of the core members, so that the core members can be easily joined together.

Brief explanation of drawings

 FIG. 1 is a plan view showing an example of a stator core according to the present invention, FIG. 2 is an enlarged front view showing one of core members constituting a stator core according to the present invention, and FIG. 3 is a fixation according to the present invention. FIG. 4 is an enlarged front view showing the other of the iron core members constituting the iron core, FIG. 4 is an explanatory view showing a state where the stator coil is inserted into the stator core according to the present invention, and FIG. 5 is an assembly of the split stator core. FIG. 6 is a perspective view showing the state, FIG. 6 is an exploded side view showing an example of a rotary turret, and FIG. 7 is a plan view showing a conventional example of a stator core. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, a rotating electric machine according to the present invention will be described in detail with reference to the illustrated embodiments. Note that, in the embodiment of the present invention, the overall configuration is roughly described with reference to FIG. Since the configuration of the stator core is different from that of the conventional rotating electric machine described above, the present invention will be described below mainly on the stator core.

 FIG. 1 shows the stator core 3A viewed from the axial direction when the present invention is applied to the induction motor shown in FIG. 6, and the stator core 3A is shown in FIG. 2 and FIG. 3 As shown in the exploded view of FIG. 3, a plurality of silicon steel sheets of two shapes, a first iron core member 31 and a second iron core member 32, are laminated so as to have a predetermined thickness. It is made.

 As is clear from FIG. 1, the stator core 3A is formed by alternately arranging the first core members 31 and the second core members 32 in an annular shape. Configuration.

 More specifically, as shown in FIG. 2, the first core member 31 includes a back portion 31a serving as a weft portion of the stator core 3A, and an inner central portion of the back portion 31a. The toothed portion has a rod-like portion that protrudes toward the center to form a tooth portion, that is, a tooth portion 31b, and a slot 3 is provided on both sides of the tooth portion 31b. A cut-out portion 31c for forming C is provided, and is formed substantially in a T-shape as a whole. Also, as shown in FIG. 3, projections 3 Id are formed on both sides 31 f of the back 31 a of the core member 31 so as to be able to engage with the second core member 32. In addition, a chamfer 31 e is formed at an upper part which is closer to the outer periphery than the protrusions 31 d.

 When the first iron core member 31 and the second iron core member 32 are arranged and joined, the end faces in the radial direction of the divided surfaces that engage with each other, that is, both side faces 31 f The adhesive layer 34 containing magnetic fine particles is applied.

 As a material of the magnetic fine particles mixed and dispersed in the adhesive layer 34, as described above, it is desirable to use a magnetic material having a high magnetic permeability such as, for example, permalloy. And its particle size should be less than 10 / imm. The magnetic fine particles are mixed and dispersed in an epoxy-based or silicon-based adhesive and applied as an adhesive layer 34.

Then, by laminating a predetermined number of the core members 31 in the axial direction, a laminated core portion 310 is formed as shown in FIG. Next, as shown in FIG. 4, the rod-shaped second core member 32 is made up of a back portion 32 a made the same length as the back portion 31 a of the iron core member 31, and a core member 31. And a tooth portion 32b having the same width as that of the tooth portion 31b and extending straight in the center direction and having a tongue piece 32c protruding in the width direction at the tip. A concave groove 32 d is formed on both sides 35 of the back part 32 a so as to be able to engage with the projection 31 d of the back part 31 a of the core member 31. Further, a chamfer 32 e is formed on the upper portion on the outer peripheral side of the concave groove 32 d like the core member 31. Also, by stacking a predetermined number of the rod-shaped core members 32 in the axial direction, a ferromagnetic bar-shaped core member 32 is formed as shown in FIG.

 In the above embodiment, the adhesive layer 34 is applied to the joint end surface of the iron core member 31, but may be formed on both side surfaces 35 serving as the joint end surface of the rod-shaped iron core member 32. It may be formed on both surfaces.

 Next, a method of forming the stator 3 by combining the stator core 3B with the single-layer core member 310 and the laminated bar-shaped core material 3200 will be described.

 When the laminated bar-shaped core member 320 is inserted from both sides of the laminated core member 310 toward the center of the stator 3 and outward, the core member is inserted into the groove 32 of each bar-shaped core member 32. When the projections 3 1 d of the 3 1 are engaged with each other, they are positioned with each other, and in this state, the teeth 3 2 b of the laminated rod-shaped core member 32 0 and the ridge layer core member 3 10 The slot 3C is defined by the tongue part 31b.

 Therefore, when the rod-shaped core member 32 is inserted and engaged, the circumferential width of the back portion 31a of each core member 31 is determined by the space of the slot 3C and the tooth portion adjacent thereto. 31 b and the space of the slot 3 C adjacent thereto are formed in a size capable of forming the space.

 The stator coil 3B is previously wound and formed into a shape that can be housed in the slot 3C. That is, in the stator coil 3B, a plurality of conductors are wound in a toroidal shape, and the portion inserted into the slot 3C has an angle corresponding to the angular position of the slot 3C. It is molded into.

Also, as shown in FIG. 5, the coil end portion 33 c of the stator coil 3 B 3 3d means that when the stator coil 3B is inserted into the slot 3C of the stator core 3A, the stator core 3A projects II to the upper and lower parts in the axial direction of the stator core 3A. .

 Therefore, when the coil ends 33c and 33d of the stator coil 3B are inserted into the slot, the coil ends 33c and 33d of the stator coil 3B are inserted into the adjacent slots. Although not shown, it is desirable to form a curved line with an appropriate radius to avoid interference with the coil end.

 First, when assembling the stator 3, a predetermined number of preformed stator coils 3B are arrayed and held in a predetermined position on a jig (not shown). In contrast, the laminated core member 310 on which the core member 31 is previously laminated is moved from the outer peripheral direction by a moving means such as an index (not shown), and the notch on both sides of the teeth 3 lb of the laminated core member 310 is removed. After positioning the stator coil 3 B in the section 3 1 c, the slightly layered iron core 320 is moved from inside the stator coil 3 B and the laminated core member 310 to a moving means (not shown). When it is moved outward in the radial direction and is inserted between the laminated core members 310, the tooth portions 31b of the core member 310 and the tooth portions of the rod-shaped core member 320 are formed. The stator can be assembled with the stator coil 3B housed in the slot 3C defined by 3b. To become. At this time, since each ridge layer core member has a manufacturing dimensional error and an assembly error, as described above, the respective laminated core members 310 and 320 are assembled. When attached, there is a slight gap in the part where the laminated core members are engaged with each other, that is, the engaging surface.

 Here, in the case of the embodiment of the present invention, as is clear from FIG. 6, there are eight engaging portions for each magnetic circuit of each magnetic pole, and therefore, If there is a gap at the joint, in addition to the original gap of the induction motor, eight similar gaps will be newly added, and the magnetic resistance will increase significantly. As a result, a large amount of magnetomotive force is required to pass the magnetic flux through the gap, resulting in an abnormal increase in the exciting current.

However, according to the embodiment of the present invention, since the adhesive layer 34 containing the magnetic fine particles is always applied to one of the joining surfaces serving as the engaging portions, even if a gap is generated in the engaging portion. An adhesive layer 34 intervenes there and is filled with magnetic fine particles. Therefore, the magnetic flux flows well through the magnetic fine particles, and even if there is a gap, it does not function as an air gap, and the increase in magnetic resistance is reliably suppressed, and the increase in the exciting current can be prevented.

 Moreover, as described above, the magnetic fine particles have an extremely fine iron particle size of 以下 Ομπιππ or less, and the fine particles are dispersed in the adhesive material. The losses are so small that they are not a problem.

 Further, the hysteresis loss of the above-described high-permeability magnetic material such as permalloy is as small as about 15 of electrolytic iron, and as a result, the iron loss due to the magnetic fine particles is extremely small as a whole. According to the present invention, it is possible to easily provide a small and lightweight rotating electric machine having sufficiently high performance.

 Here, the effects of the present invention are listed as follows.

 (1) The use of the split stator core can sufficiently improve the occupation rate of the stator coil in the stator slot. A rotating electric machine can be easily provided.

 (2) The increase in magnetic resistance due to the use of the split stator core can be reliably suppressed without increasing the iron loss, so there is no reduction in efficiency or power factor despite its small size and light weight. Thus, a high-performance rotating electric machine can be provided at low cost.

Claims

Scope of the request The stator core is divided into a plurality of core members, created, combined with a stator coil that has been wound and shaped in advance, and then joined together to form an assembly. A rotary electric machine of the split stator core type, wherein an adhesive containing magnetic fine particles is interposed at a joint surface between the iron core members. An adhesive containing the magnetic fine particles is applied in advance to the joint surface of the iron core member before the assembly, and after the assembly, the adhesive is cured to obtain the joint. A rotating electric machine characterized by the following.