JP4959389B2 - 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.

  In the inner rotor motor as shown in FIG. 7A, the motor casing 4 includes a casing body 4a and a top cover 4b. A stator 2 with a winding 2a is fixed inside the casing body 4a. A rotor 1 having an output shaft 1a coaxially with the center inside the stator 2 is rotatably attached to the motor casing 4 via bearings 8a and 8b.

  The core shape of the stator 2 is such that the outer ends (base ends) of the teeth 9 are connected to each other as shown in FIG. 7B, and a gap 10 is formed between the tips of the adjacent teeth 9 inside the stator 2. A magnetic steel plate is punched into a shape, the punched magnetic steel plates are laminated, a winding nozzle (not shown) of a winding machine is inserted from the gap 10, and the winding nozzle is rotated around the teeth 9 and the teeth are rotated. The winding process to 9 is implemented.

However, in such a winding process, it is difficult to process and it is difficult to improve the winding occupancy rate. Therefore, in Patent Document 1, as shown in FIG. A stator core 2a in which a gap 10 is formed is used. As shown in FIG. 8 (b), the stator core 2a is formed into a plurality of divided tooth blocks 12a, 12b... And the inner peripheral ends of the teeth blocks 12a, 12b. It is arranged in an annular shape and is cast by an insulating synthetic resin 13. Thereafter, the winding nozzle is inserted into the outer peripheral side from the gap 11 and the winding process is performed, and the stator core 2A that has been subjected to the winding process is press-fitted inside the casing body 4a, so that the outer peripheral side of the adjacent tooth block Are connected by a casing body 4a to form a magnetic circuit.
JP-A-3-235629

  By adopting the stator core 2a shown in FIG. 8, the workability of the winding process and the improvement of the winding rate can be realized. However, due to the stress generated when the stator core 2a is press-fitted into the casing body 4a, the inner wall of the casing body 4a An irregular gap is formed between the outer peripheral surface of the stator core 2a and the magnetic resistance is increased, or the inner peripheral surface of the stator core 2a is distorted to reduce the roundness accuracy and easily increase the cogging torque. The current performance is inferior to the motor using the stator core having the shape shown in FIG.

  In particular, in the high temperature environment, the insulating synthetic resin 13 that casts the teeth blocks 12a, 12b... Tends to creep, and the holding force for connecting the teeth blocks 12a, 12b. There is a problem that the inner peripheral surface of the rotor may be greatly distorted to hinder the rotation of the motor, or the stator core 2a may move when vibration is applied because the stress holding the stator core 2a is reduced.

  An object of this invention is to provide the motor which can implement | achieve the workability | operativity of a winding process, and the improvement of a winding occupancy, and can implement | achieve smooth rotation performance and high reliability.

  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 rotationally drives the rotor by generating the stator, the stator is arranged in an annular shape with one end on the inner peripheral side of the divided tooth block approached, and one end on the inner peripheral side of the tooth block is connected, One end of the teeth block on the outer periphery side abuts the inside of the motor casing so that a magnetic path is formed through the motor casing between one end of the adjacent teeth block on the outer periphery side. The connection at the side end is connected through a ring made of a nonmagnetic material or a low magnetic material.

  According to a second aspect of the present invention, in the motor according to the first aspect, the ring is formed with a protrusion sandwiched between adjacent tooth blocks on a contact surface with the tooth block.

  According to a third aspect of the present invention, in the motor according to the first or second aspect of the present invention, an overhanging portion extending from the central portion to both sides along the inner side of the motor casing is formed at one end on the outer peripheral side of the teeth block. The overhanging portion contacts and deforms inside the motor casing, and a gap is formed between the central portion and the inside of the motor casing.

  According to a fourth aspect of the present invention, there is provided a method of manufacturing a motor according to the present invention, wherein the teeth block is arranged in an annular shape with one end on the inner peripheral side of the teeth block close to each other, and a ring of a nonmagnetic material or a low magnetic material is used. One end of the inner peripheral side is connected to form a tooth block connecting body, a winding is individually applied to the tooth portion of each tooth block of the tooth block connecting body, and a magnet is provided between one end on the outer peripheral side of the adjacent tooth block. The teeth block connecting body is press-fitted inside the motor casing so that a path is formed, and the windings of each tooth block are connected in a pre-process or a post-process where the tooth block connecting body is press-fitted into the motor casing. It is characterized by.

  According to a fifth aspect of the present invention, there is provided a motor manufacturing method according to the fourth aspect, wherein when the inner end of the teeth block is connected via the ring to form the tooth block connecting body, the motor block is formed on the ring. The protrusion is connected in a state of being sandwiched between adjacent tooth blocks.

  According to a sixth aspect of the present invention, there is provided a method for manufacturing a motor according to the fourth or fifth aspect, wherein the winding of the teeth block connecting body is wound before the teeth of each tooth block of the tooth block connecting body are wound. It is characterized by being cast with an insulating resin over the tooth portion of each tooth block.

  According to a seventh aspect of the present invention, there is provided a method for manufacturing a motor according to the fourth or fifth aspect, wherein the winding of the teeth block connecting body is wound before the teeth of each tooth block of the tooth block connecting body are wound. It is characterized by being cast with a heat conductive resin over the tooth portion of each tooth block.

  According to this configuration, the workability of the winding process and the improvement of the winding occupancy can be realized, and the connection at the inner peripheral side end of the teeth block is connected through the low magnetic material ring. Less deformation due to creep than conventional structures connected via synthetic resin, can maintain smooth rotation performance, and can maintain reliability even when used in high temperature and high vibration environments .

  In addition, since a gap is formed between the center of the outer peripheral end of the teeth block and the inside of the motor casing, the roundness of the inner peripheral circle of the stator core after the teeth block coupling body is press-fitted into the motor casing. There is very little decline, and smooth rotation performance can be achieved.

Hereinafter, the motor of the present invention is explained based on an embodiment.
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 lead 15 of the stator winding 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. ing.

2 to 6 show details of the stator 2 and the casing body 4a.
The stator core of the stator 2 is composed of a plurality of teeth blocks 16 and two rings 17 shown in FIG.

  The teeth block 16 is formed by stacking magnetic steel plates, and at one end of the inner peripheral side 18 is an overhanging portion 19b, 19c facing the outer periphery of the rotor 1 with a gap in the assembled state as shown in FIG. It is formed on both sides from the central portion 19a. 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. 3, twelve teeth blocks 16 are arranged in an annular shape with one end on the inner peripheral side being close to each other, and adjacent teeth blocks 16 are connected from above and below by a ring 17 so that FIG. The teeth block coupling body 23 shown in FIG.

  The material of the ring 17 is most preferably a non-magnetic metal or a reinforced plastic. In the case of a metal, the ring 17 can be made of a low-magnetic metal that is slightly magnetized during processing. As a specific example of the reinforced plastic, a resin obtained by kneading a heat conductive material such as ceramic powder in a polyphenylene sulfide (PPS) resin and imparting heat conductivity can be used.

  The material of the ring 17 is preferably a material having a thermal expansion coefficient extremely close to that of the tooth block 16. Specifically, when the material of the teeth block 16 is a silicon steel plate, examples of the ring 17 include austenitic stainless steel. Here, SUS304 is used.

  Twelve protrusions 22 are formed at equal intervals on the surface of the ring 17 facing the tooth block 16, and the protrusions 22 extend over the adjacent teeth blocks 16 as shown in FIG. 5. The overhanging portions 19 b and 19 c of the adjacent tooth blocks 16 are in contact with each other via the protrusions 22.

  As shown in FIG. 4 (a), the 12 teeth blocks 16 connected by the two rings 17 are cast from the ring 17 to the teeth portion of each teeth block 16 with the insulating resin 24, and the teeth blocks are formed. A connecting body 23 is configured. As the insulating resin 24 to be used, use of a resin obtained by kneading a thermal conductive material such as ceramic powder in a polyphenylene sulfide (PPS) resin to impart thermal conductivity can suppress the temperature rise of the winding 26 during operation. Therefore, the reliability of the motor is further improved.

  Next, a winding process is performed from the gap 25 to each tooth portion of the tooth block coupling body 23 to finish the state shown in FIG. As described above, the winding 26 is wound from the gap 25 on the outer periphery of the teeth block coupling body 23, so that the workability of the winding process and the improvement of the winding occupation ratio can be maintained.

  Next, as shown in FIG.4 (c), the teeth block coupling body 23 in which the winding process was completed is press-fitted inside the casing body 4a. The connection of the windings 26 of the teeth block 16 may be performed either in a pre-process or a post-process in which the teeth block coupling body 23 is press-fitted into the motor casing 4, and the corresponding teeth blocks 16 are continuously wound. It doesn't matter.

FIG. 5 shows the details of the teeth block connector 23 after press-fitting. Note that the winding 26 is not shown here.
In the press-fitted tooth block connecting body 23, 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 motor casing 4a, so that the adjacent teeth A magnetic path is formed between the outer peripheral side end of the block via the motor casing body 4a.

  Thus, in the state in which the tooth block coupling body 23 is press-fitted, a state in which a large force acts in the direction of reducing the inner diameter between the adjacent tooth blocks 16 on the inner peripheral side 18 of the teeth block 16 continues. In the state where only the synthetic resin 13 is interposed as in the conventional example illustrated in FIG. 8B, creep occurs in the interposed synthetic resin 13 and the arrangement of the magnetic poles on the inner periphery of the stator 2 is true. In this embodiment, when the material of the teeth block 16 is a silicon steel plate, the ring 17 has a higher rigidity than the synthetic resin 13 in the SUS304. A tooth ring 16 is used to connect the teeth block 16 with a projection 22 of the ring 17 interposed. Furthermore, as illustrated in FIG. 5, a space between adjacent tooth blocks 16, that is, a space surrounded by the tip portions 19 b and 19 c, is formed in a shape that expands in the inner diameter direction, and intervenes here. Since the spacer 22 is also formed in a shape that expands in the inner diameter direction, the spacer 22 functions as a wedge, and exhibits a kind of wedge effect. Therefore, as shown by an arrow F in FIG. Even if a force is applied and a large force continues between adjacent teeth blocks 16, the stator core does not rattle and the roundness of the magnetic pole array on the inner periphery of the stator 2 is reduced. do not do.

Therefore, smooth rotation performance can be maintained over a long period of time, and rotation performance and reliability can be maintained even when used in a severe environment of high temperature and high vibration.
Further, in this embodiment, the protruding portion 21b, 21c is in contact with the inner side of the motor casing body 4a at one end on the outer peripheral side of the teeth block 16 even when the protruding portions 21b, 21c are in contact with the inner side of the motor casing body 4a. There is no central portion 21a, and a gap 27 is formed between the central portion 21a at one end on the outer peripheral side of the teeth block 16 and the inside of the motor casing body 4a.

It will be described with reference to the comparative example shown in FIG. 6 that the formation of the gap 27 as described above can more reliably prevent the roundness of the magnetic pole array on the inner periphery of the stator 2 from being lowered. .
In the case of FIG. 6, the shape of one end on the outer peripheral side of the teeth block 16 is different from that of the above embodiment, the shape of one end on the outer peripheral side of the teeth block 16 is a part of an arc, and its radius of curvature is the casing. It is set to be approximately equal to the radius of curvature of the inner periphery of the main body 4a. In the state where the teeth block coupling body 23 is press-fitted inside the motor casing main body 4a, the central portion 21a abuts on the inner side of the motor casing main body 4a and the magnetic pole 28 is pushed out to the inner peripheral side as indicated by an arrow 29. As the teeth block connector 23 is press-fitted inside the motor casing body 4a, the position of the magnetic pole on the inner peripheral side is deformed inward as indicated by the phantom line, and smooth rotation performance cannot be obtained.

  On the other hand, when the gap 27 is left as shown in FIG. 5, the positional deviation of the magnetic poles caused by press-fitting the teeth block coupling body 23 into the motor casing body 4a is compared with FIG. Therefore, smooth rotation performance can be obtained.

  Although the magnetic resistance is increased in the gap 27, as described above, since the projecting portions 21b and 21c are in contact with the inner side of the motor casing body 4a to form a magnetic path, the magnetic flux does not decrease. It is configured.

  Further, when the teeth block coupling body 23 is press-fitted inside the motor casing body 4a, a deformation preventing jig is inserted into the inner circumference of the teeth block coupling body 23 in order to further reduce the deformation of the inner circumference of the teeth block coupling body 23. Press-fit in the state.

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

Longitudinal sectional view and transverse sectional view of the motor of the present invention Enlarged perspective view of teeth block and ring of the same embodiment The disassembled perspective view of the teeth block coupling body of the embodiment Process drawing of press-fitting into the casing body after insulation treatment and winding treatment on the teeth block connector of the same embodiment The enlarged view of the state which press-fitted the teeth block coupling body of the same embodiment to the casing main body Enlarged view of the comparative example Vertical section of motor and plan view of stator core of first conventional example The top view of the stator core of a 2nd prior art example, and the principal part enlarged view of a 2nd prior art example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotor 1a Output shaft of rotor 1 Stator 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 15 Lead of stator winding of stator 2 16 Teeth block 17 Ring 18 Teeth block inner peripheral side 19a Teeth block inner peripheral side central portion 19b, 19c Teeth block inner peripheral overhang portion 20 Teeth block outer peripheral side 21a Teeth block outer peripheral side central portion 21b , 21c Projection portion 22 on the outer peripheral side of the tooth block 22 Ring protrusion 23 Teeth block connector 24 Insulating resin 26 Winding 27 Gap 28 Magnetic pole

Claims (7)

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 is annularly arranged with one end on the inner peripheral side of the tooth block divided into a plurality of pieces, and one end on the inner peripheral side of the tooth block is connected, and between one end on the outer peripheral side of the adjacent tooth block. One end of the teeth block on the outer peripheral side is in contact with the inside of the motor casing so that a magnetic path is formed through the motor casing, and the connection of the one end on the inner peripheral side of the teeth block is non-magnetic material or low magnetic Motor connected through a ring of material. The ring is
The motor according to claim 1, wherein a protrusion sandwiched between adjacent tooth blocks is formed on a contact surface with the tooth block. At one end on the outer periphery side of the tooth block,
Forming a projecting portion extending from the center portion to both sides along the inside of the motor casing;
3. The motor according to claim 1, wherein the projecting portion is deformed by contacting the inner side of the motor casing, and a gap is formed between the central portion and the inner side of the motor casing. A plurality of divided teeth blocks are arranged in an annular shape with one end on the inner circumference side close to each other, and one end of the teeth block on the inner circumference side is connected via a ring made of a non-magnetic material or a low magnetic material to form a tooth block coupling body. And
Applying a winding individually to the teeth part of each tooth block of the tooth block connected body,
The teeth block coupling body is press-fitted inside the motor casing so that a magnetic path is formed between one end of the adjacent teeth block on the outer peripheral side,
A method for manufacturing a motor in which the windings of each tooth block are connected in a pre-process or a post-process in which the tooth block coupling body is press-fitted into the motor casing. When connecting the inner peripheral side one end of the tooth block through the ring to form the tooth block connected body,
The method of manufacturing a motor according to claim 4, wherein the protrusions formed on the ring are connected while being sandwiched between adjacent tooth blocks. Before winding a tooth part of each tooth block of a tooth block coupling body, it casts with an insulating resin from the ring of the teeth block coupling body to a tooth portion of each tooth block. The manufacturing method of the motor of description. 6. The method according to claim 4 or 5, wherein, before winding the teeth portion of each tooth block of the tooth block connecting body, a heat conductive resin is cast from the ring of the tooth block connecting body to the tooth portion of each tooth block. A method for manufacturing the motor according to claim 1.

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