JP5146089B2 - motor - Google Patents

Description

  The present invention relates to a motor that is operated in a high temperature environment such as an engine room environment of a car or a high vibration environment.

The motor's stator core is made of laminated magnetic steel sheets to reduce eddy current loss. However, because it is manufactured by pressing a thin sheet of high hardness, burrs are generated and the contour edges are sharp. When coating for insulation between the winding and the stator core, it was necessary to apply a thick coating to cover the edges. (For example, see Patent Document 1)
However, thick coating reduces the volume that can be wound, reducing motor efficiency, and hindering heat dissipation from the winding to the stator core, resulting in a large increase in winding temperature. The motor output is limited by the rise.

  Conversely, if the heat dissipation from the winding to the stator core can be improved to reduce the temperature rise of the winding, the maximum output of the motor can be increased. For that purpose, it is only necessary to apply a thin insulating coating with a high thermal conductivity to cover the edges of the stator core, but an insulating coating with a high thermal conductivity (for example, a ceramic coating) has a low edge covering property (for the edge portion). There was a problem that the coating film thickness was reduced.

  Also, for insulating motors that are used for a long time in high-temperature environments such as the engine room environment of automobiles, inorganic paints such as ceramic paints, which have better heat resistance and durability than organic paints, are preferred, but ceramic paints are representative. As described above, there was a problem that the edge coating property was low.

In order to avoid the above problem, there has been a method of performing a process of removing burrs and edges of the stator iron core by a method such as barrel polishing before the insulation coating. (For example, see Patent Document 2)
Japanese Patent Laid-Open No. 63-59742 Japanese Patent Laid-Open No. 5-268738

However, it is necessary not only to take a long time to drop the edge of the stator core sufficiently, but also to increase the lamination strength so that the laminated electromagnetic steel sheets do not separate during processing.
In order to increase the lamination strength, it is necessary to laminate by welding such as laser welding, or to increase the area of the crimping pressure bonding portion for lamination. Lamination by laser welding increases the equipment cost or running cost, and an increase in the area of the crimped crimping part causes a decrease in magnetic properties.

  The present invention aims to improve the winding occupancy ratio of motors operating in high-temperature environments and high-vibration environments, as well as prevent output from decreasing due to temperature rise of the windings, realizing high output, high efficiency and high reliability. An object of the present invention is to provide a motor that can be used.

According to a first aspect of the present invention, a winding-processed stator is disposed inside a motor casing, a rotor is disposed on the inner periphery of the stator, and energization of the stator winding is switched to rotate a rotating magnetic field. In the motor that rotates the rotor by generating the rotor, the stator is arranged annularly by dividing the inner peripheral side ends of a plurality of teeth that are formed by laminating a plurality of silicon steel plates and dividing each tooth. A tooth block, end plates disposed on both sides in the axial direction of the tooth block, and an insulating layer covering at least a portion where the winding is wound, the tooth block being interposed via the end plate. The end plate is made of non-magnetic metal or low magnetic metal, and a plurality of teeth having the same shape as the teeth block are arranged in the same arrangement as the teeth block. And, together with formed by connecting the inner peripheral side end of the teeth, wherein the winding to form a chamfer or curved edge portion of the portion to be wound.

  According to a second aspect of the present invention, the motor according to the first aspect is characterized in that the insulating layer is formed of a ceramic paint.

  The motor according to claim 3 of the present invention is characterized in that, in claim 1, the thickness of the end plate is made thicker than the silicon steel plate constituting the tooth block.

  According to this configuration, end plates made of non-magnetic metal or low-magnetic metal are arranged above and below the stator core, and the teeth block is connected by the end plates, and the edges where the end plate windings are wound are arranged. By forming a curved surface, the workability of the winding can be greatly improved, and sharp burrs, etc. of the edges that occur during the pressing of the stator core are covered with the end plate, and there are sharp burrs, etc. Since the winding is wound through the insulating layer coated on the curved surface portion of the end plate not to be broken, the insulation coating of the winding can be prevented from being broken. That is, the end plate can be combined with the function of preventing the breakage of the connection of the teeth block and the insulation coating of the winding. And since the end plate provided separately from the teeth block formed by laminating silicon steel plates is chamfered or curved, the teeth block is not affected by chamfering or curved processing. Therefore, there is no need to increase the strength of the lamination, so there is no increase in magnetic resistance due to lamination, but the space required for lamination can be reduced even when using a lamination method with low adhesion strength or using a lamination method with caulking. Since it can be made smaller, the efficiency of the motor can be improved.

  In addition, heat from the windings to the stator core can be dissipated by using inorganic (ceramic) paint with high thermal conductivity, which has not been able to be used for insulation coating of the stator core. And the temperature rise of the winding decreases. Thereby, since the winding resistance during operation can be reduced, the maximum output and efficiency of the motor can be improved and the heat resistance and durability can be improved.

  Further, since the end plate is made of a material thicker than the silicon steel plate constituting the tooth block, the edge chamfer dimension or the radius of the curved surface can be increased.

  Hereinafter, the motor of the present invention is explained based on an embodiment.

(Embodiment 1)
1 to 6 show a motor of the present invention. The motor shown in FIG. 1A is a cross-sectional view taken along line A-AA in FIG.

  The motor casing 4 includes a metal casing body 4a and a metal casing lid 4b. Inside the casing body 4a, the rotor 1, the stator 2, and part of the first and second wiring boards 3a and 3b are housed. The stator 2 is disposed coaxially with the output shaft 1 a of the rotor 1. The first wiring board 3 a is disposed at the end of the rotor 1 and the stator 2 in the opposite direction of the output shaft 1 a of the rotor 1. A control circuit 6 and a power element 7 are mounted on the first wiring board 3a.

  The second wiring board 3b on which the magnetoelectric conversion element 5 is mounted is disposed between the rotor 1 and the first wiring board 3a. The magnetoelectric conversion element 5 is disposed close to the rotor 1, and a detection signal or the like detected by the magnetoelectric conversion element 5 detecting the magnetic pole of the rotor 1 is transmitted from the second wiring board 3 b to the control circuit 6 of the first wiring board 3 a. And the control circuit 6 switches the energization to the winding 2a of the stator via the power element 7 mounted on the same first wiring board 3a to generate a rotating magnetic field to drive the rotor 1 to rotate. Yes.

  2 to 6 show details of the stator 2 and the casing body 4a. The stator core of the stator 2 includes a plurality of teeth blocks 16 shown in FIG. 2A and FIGS. 2B and 3A to 3C arranged on both upper and lower sides of the teeth block 16 in the axial direction. And two end plates 17 shown in FIG.

FIG. 2B is a perspective view of the end plate 17, and FIG. 3A is a plan view of the end plate 17.
FIG. 3B is a cross-sectional view taken along the line AOA ′ in FIG. 3A, and FIG. 3C is a cross-sectional view taken along the line BB ′ in FIG.

  The teeth block 16 is configured by stacking silicon steel plates with a strength that can withstand normal operations such as conveyance and installation on a jig by general known means such as caulking and bonding. At one end of the inner peripheral side 18 of the teeth block 16, overhanging portions 19b and 19c are formed on both sides from the central portion 19a so as to face the outer periphery of the rotor 1 with a gap in the assembled state as shown in FIG. In addition, projecting portions 21 b and 21 c extending from the central portion 21 a to both sides along the inner side of the motor casing are formed at one end of the outer peripheral side 20.

  In this embodiment, as shown in FIG. 4, twelve teeth blocks 16 are arranged in an annular shape with their inner peripheral side ends close to each other. As shown in FIGS. 2B and 3A, the end plate 17 has a plurality of teeth 17a having the same shape as the teeth blocks 16 arranged in the same arrangement as the teeth blocks 16, and the inner periphery of each tooth 17a. The side end is connected and formed. A first protrusion 17b is formed on the surface of the end plate 17 that abuts the tooth block 16 of each tooth 17a in the axial direction. Further, twelve second protrusions 17 c are formed at equal intervals on each tooth connecting portion of the end plate 17.

As shown in FIG. 2A, a recess 16 a is formed at a position corresponding to the first protrusion 17 b of the end plate 17 of the tooth block 16, and the first protrusion 17 b is connected to the tooth block 16. By performing press-fitting caulking into the recess 16a from above and below, adjacent tooth blocks 16 are connected to form a tooth block connecting body 23 shown in FIG. At this time, the second protrusion 17c is sandwiched between the overhanging portions 19b and 19c of the adjacent tooth block 16 as shown in FIG. 6, and the overhanging portions 19b and 19c of the adjacent tooth block 16 are It is contact | abutted in the circumferential direction via the 2 protrusion 17c.
Further, in the range including the portion where the winding indicated by P in FIG. 3A of each tooth of the end plate 17 is wound, the edge portion 17d on the surface opposite to the surface in contact with the tooth block 16 has As shown in FIG. 3C, a curved surface of r0.05 mm to 0.3 mm is formed by pressing, sandblasting or the like so that sharp burrs or the like are not generated at the edge portion.

  When the material of the teeth block 16 is a silicon steel plate, it is desirable to use SUS304 or the like as the material of the end plate 17 which is a nonmagnetic material or a low magnetic material and has a thermal expansion coefficient very close to that of the teeth block 16. .

And the plate | board thickness of the end plate 17 is larger than the plate | board thickness of the individual silicon steel plate which laminates | stacks and comprises the teeth block 16, In this Embodiment, the plate | board thickness of each silicon steel plate which comprises the teeth block 16 is set. The thickness of the end plate 17 is set to 0.55 mm.

Next, as shown in FIG. 5 (b), a ceramic-based paint having a high thermal conductivity (for example, trade name: HYPER COAT, for example, Microcortech Co., Ltd.) at least at the portion where the winding of the tooth block connector 23 is wound. The insulating layer 24 is formed by the above, and the tooth block coupling body 23a coated with insulation is produced. FIG.5 (b) is sectional drawing of the location in which the insulating layer 24 of the teeth block coupling body 23a was formed. This corresponds to the location indicated by CC ′ in FIG.
Thereafter, a winding process is applied to each tooth part from the gap 25 between each tooth block 16 to finish the state shown in FIG. .

  As described above, a curved surface of r0.1 mm to 0.3 mm is formed on the edge portion 17d of the end plate 17 where the winding of the teeth block coupling body 23 is performed, using a punching of press working, Since sharp burrs or the like are prevented from occurring at the edge portion, there is no problem of damaging the winding by breaking through the insulating layer 24 without coating the insulating layer 24 thickly.

  Further, since the winding 2a is wound from the gap 25 on the outer periphery of the tooth block coupling body 23a coated in this way, the workability of the winding process and the improvement of the winding occupation ratio can be maintained.

  Next, as shown in FIG.5 (d), the teeth block coupling body 23b in which the insulation coating and the winding process were performed is press-fitted inside the casing main body 4a. The connection of the winding 2a of the tooth block 16 may be performed either in a pre-process or a post-process in which the tooth block coupling body 23b is press-fitted into the casing body 4a, and the corresponding teeth blocks 16 are continuously wound. It doesn't matter.

  In the press-fitted teeth block connecting body 23b, the protruding portions 21b and 21c at one end on the outer peripheral side 20 of the tooth block 16 are deformed from the wavy line position to the solid line position and press-fitted into the casing body 4a, so that the adjacent teeth A magnetic path is formed between the outer peripheral side end of the block via the casing body 4a.

  In the present embodiment, a curved surface of r0.1 mm to 0.3 mm is formed on the edge portion 17d of the end plate 17 using a punching of press working, but c 0.2 mm to 0.3 mm of press working is used. The same operation and effect can be obtained even if a deburring process of r0.05 mm to r0.2 mm is performed on the entire surface of one side of the end plate 17 by chamfering or sandblasting.

  The present invention can contribute to improving the reliability of various devices using a small motor.

(A) A longitudinal sectional view of the motor according to the first embodiment of the present invention, (b) a transverse sectional view of the motor according to the first embodiment of the present invention. (A) Perspective view of tooth block of same embodiment, (b) Enlarged perspective view of end plate (A) A plan view of the end plate of the same embodiment, (b) a cross-sectional view of AO-A 'in FIG. 3 (a), (c) a cross-sectional view of B-B' in FIG. 3 (a) The disassembled perspective view of the teeth block coupling body of the embodiment (A) The figure which shows the teeth block coupling body of the embodiment, (b) The figure which performed the insulation process on the teeth block coupling body, (c) The figure which performed the winding process on the teeth block coupling body after the insulation process (D) The figure which press-fitted the teeth block coupling body into the casing main body. The enlarged view of the state which press-fitted the teeth block coupling body of the same embodiment to the casing main body

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotor 1a Output shaft of rotor 1 Stator 2a Winding 3a 1st wiring board 3b 2nd wiring board 4 Motor casing 4a Casing main body 4b Casing lid 5 Magnetoelectric conversion element 6 Control circuit 7 Power element 16 Teeth block 16a Recessed part 17 End plate 17a End plate teeth 17b First protrusion 17c Second protrusion 17d Edge 18 Inner side of teeth block 19a Inner side of teeth block 19b, 19c Overhang of teeth block on inner side Part 20 Teeth block outer peripheral side 21a Teeth block outer peripheral side central part 21b, 21c Teeth block outer peripheral side projecting part 23 Teeth block coupling body 23a Insulated painted tooth block coupling body 23b Insulated coating and winding treatment Teeth block ream Assembly 24 Insulating layer 25 Clearance P Winding winding location

Claims (3)

A motor in which a stator subjected to winding is disposed inside a motor casing, a rotor is disposed on the inner periphery of the stator, and a rotating magnetic field is generated by switching energization to the winding of the stator to rotate the rotor. In the stator, a plurality of teeth formed by laminating a plurality of silicon steel plates are brought close to each other on the inner peripheral side, divided into each tooth, and arranged in an annular shape, and the axial direction of the teeth block It consists of an end plate disposed on both sides and an insulating layer covering at least a portion where the winding is wound, and the teeth block is connected via the end plate, and the end plate is not A plurality of teeth that are made of magnetic metal or low magnetic metal and have the same shape as the teeth block are arranged in the same arrangement as the teeth block, and one end on the inner peripheral side of each tooth is connected. Motor to thereby form, characterized in that said winding to form a chamfer or curved edge portion of the portion to be wound. The motor according to claim 1, wherein the insulating layer is formed of a ceramic paint. The motor according to claim 1, wherein the thickness of the end plate is thicker than the silicon steel plate constituting the tooth block.

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