WO1997033357A1

WO1997033357A1 - Rotor of rotary machine

Info

Publication number: WO1997033357A1
Application number: PCT/JP1996/000515
Authority: WO
Inventors: Kenji Ogishima; Tsutomu Shiga
Original assignee: Nippondenso Co., Ltd.
Priority date: 1995-02-06
Filing date: 1996-03-04
Publication date: 1997-09-12

Abstract

An air passage (523a) is defined in a rotor core (520) by a punch hole (523) opened in each core plate (521) so laminated as to constitute the rotor core (520), and communicating with each other. Because the core plates (521) are laminated under the state where they are rotated by a predetermined angle relative to one other, the air passage (523a) is twisted towards one of the sides in a circumferential direction. According to this construction, an air flow is generated in the air passage (523a) by the revolution of the rotor core (520), and the rotor core (520) can be cooled satisfactorily. This construction is also effective for blowing dust of wear of a brush.

Description

Specification

Rotor of rotating electric machine

The present invention relates to a rotor of a rotating electric machine applied to, for example, a starting motor for starting an engine. Background art

The conventional starting motors such as the Japan Electric Equipment Co., Ltd. No. 8 3 1 1 3 4 provide blades on the end face of the rotor core to circulate the air inside the motor, The inside of the starting motor is cooled by exchanging air.

In the starting motor disclosed in Japanese Patent Application Laid-Open No. Sho 64-1637, an air passage is provided in the rotor core in the axial direction so that the negative pressure of the intake air of the engine and the positive pressure of the turbocharger are reduced. It is proposed that the rotor iron core be cooled by introducing airflow generated by the pressure difference between positive pressure or negative pressure air generated by an engine such as pressure and atmospheric pressure into this air passage. are doing.

However, the method of generating cooling air by providing blades on the end face of the rotor core has the disadvantages of increasing the number of parts and increasing the axial dimension of the rotor. I do.

Also, when such a blade is used for a rotating electric machine with a brush, the blowing wind that blows from the blade is blown directly to the brush that is normally located on the smaller diameter side than the blade. It was difficult to remove the brush abrasion powder from around the brush, which caused a problem.

On the other hand, according to the above publication, it is necessary to communicate the pressure source outside the motor with the motor via a pressure pipe, and it is said that the efficiency of using the pressure of the pressure source is reduced. There was also a problem. Furthermore, in a rotating electric machine with a brush, There was also a problem in that abrasion powder such as lashes was sucked into the engine or the like.

Accordingly, the present invention has been made in view of the above-described problems, and a rotating device capable of improving the cooling performance while preventing an increase in the number of parts, miniaturizing the rotor and simplifying the structure. The primary purpose is to provide an electric motor rotor.

The second object of the present invention is to provide a rotor of a rotary electric machine capable of favorably removing brush abrasion powder while reducing the size and simplifying the structure of the rotor. It is the purpose. Disclosure of the invention

In the present invention, air passages are formed in the rotor core by punching holes that are opened in each of the laminated core plates to form the rotor core and communicate with each other. In particular, in the present configuration, the air passages are formed by twisting the air passages to one side in the circumferential direction by stacking the core plates in a state of being rotated relative to each other by a predetermined angle.

In this case, the airflow is formed in the air passage by the rotation of the rotor core, and as a result, the air sucked into the air passage from the suction port of the air passage is accelerated. Then, it is blown out partly in the axial direction and mostly in the dividing direction from the outlet of the air passage. As a result, the rotor core is cooled well, and the parts near the blowout port are also cooled well by the airflow blown out from the blowout port. . In addition, it is possible to prevent an increase in the physique of the rotor due to the addition of a blade or the like.

In addition, one end face of the rotor core, in which the outlet of the air passage opens, faces the brush, so that the air flow blown out from the outlet impinges on the brush. This can cool the brush etc. and blow off the brush abrasion powder satisfactorily.

In particular, the outer diameter of the slip ring or commutator fitted to the rotating shaft Normally, the outer diameter of the core is much smaller than the outer diameter of the core. It is difficult to blow the blown air stream directly onto the brush. In this configuration, the air passage can be provided radially inside the rotor core, and the air flow can be blown out in the axial direction and the circumferential direction. Cooling of brushes and commutators and blowing out of brush abrasion powder are improved. If the brush wear powder accumulates on the commutator surface, the commutation will be reduced.

Furthermore, the rotating electric machine is a commutator-type starting motor. In engine starting motors, the large heat generated by the coil (armature coil) wound on the rotor core is largely dependent on the heat radiation to the rotor core. . With this configuration, the axial center of the rotor core, which was not easy to cool in the past, can be cooled well, and the improved cooling of this armature coil improves the burning resistance of the starting motor. Can be further improved.

Also, an air exhaust hole is penetrated on the brush side of the housing, and an air inflow hole is penetrated on the opposite brush side, so the housing on the opposite brush side from the air inflow hole. The air that has flowed into the internal space is accelerated by the air passages of the rotor core and blows out to the housing internal space on the brush side, and wears the brush while cooling the brushes etc. It is discharged from the air discharge hole with powder. Therefore, the accumulation of brush abrasion powder in the housing can be reduced.

Furthermore, each core plate is divided into a plurality of groups, and any two adjacent groups adjacent to each other are shifted by a predetermined slot pitch in the circumferential direction. It is a feature. In this way, regardless of the circumferential displacement of the core plate, there is no problem in inserting the coil into the slot. The occupied angle in the circumferential direction of the base and the punched hole is naturally larger (for example, three times or more) than the occupied angle in the circumferential direction of the predetermined slot pitch. In addition, a predetermined number of core plates adjacent to each other are less than one slot pitch in the circumferential direction with respect to other adjacent core plates. For example, 0. (Less than one slot pitch), and the slot of the rotor core is formed by being twisted to one side in the circumferential direction. By doing so, the slot is formed by being twisted in the circumferential direction, so that the step in the air passage is reduced, and the air resistance can be reduced. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a perspective view showing an embodiment of the rotor of the rotating electric machine according to the present invention. FIG. 2 is a front view showing the core plate 5 21 of FIG. FIG. 3 is an axial cross-sectional view of a starter that uses the rotating electric machine of FIG. 1 as a starting motor. FIG. 4 is a front view showing a modified example of the core plate 521 of FIG. FIG. 5 is an axial sectional view showing another embodiment of the star shown in FIG. FIG. 6 is an enlarged perspective view of the rotor of the rotating electric machine of FIG.

BEST MODE FOR CARRYING OUT THE INVENTION

(Example 1)

One example of the rotor of the present invention will be described with reference to FIGS. This rotor (armature) 540 constitutes an armature of a DC motor as a starting motor.

The armature (rotor) 5.10 is, as shown in FIG. 1 or FIG. 3, the armature shaft (rotation axis) Γ, 10 and the armature shaft. It has an armature core (rotary iron core) 52 0 fitted to 5 10 and a commutator set (rectifier) 51 1. Fermat core 5 20 is core plate 5

The core plate 52 1 is formed by laminating a large number of layers 21, and the armature shaft 5 10 is press-fitted and fixed in the hole 5 22 of the core plate 5 21. The core plate 52 1 is formed by stamping a thin steel plate by pressing, and the inner side of the core plate 52 1 (around the hole 52 2) has The punched holes 5 2 3 for positioning the core plate 5 2 1 and reducing the weight are equally spaced in the circumferential direction. Multiple (for example, 5) are formed at intervals. A plurality of (for example, 25) slots 52 for accommodating the armature coil 5330 are formed on the outer periphery of the core plate 51, and the core A surface 524a is formed at the outer peripheral end of the rate 521, adjacent to each slot 524. At the outer peripheral end of the case 524a, the armature coil 530 is stored in the slot 524, and then the armature coil 530 is detached. Slot 5 to prevent

A fixed claw 5 25 which is pushed down on the opening side of 24 is formed.

The armature core 520 will be described in more detail.

When laminating core plates 5 2 1, core plates 5 2 1 are stacked one by one or in multiples one slot pitch sequentially to one side in the circumferential direction. The layers are stacked one after the other. By doing so, the air passages 52 3 a formed in the armature cores 52 by the communication of the punched holes 52 3 have the shape of the slots 52 4. It can be twisted to one side in the circumferential direction without making any changes. The opening of the air passage 52 3 a at the front end 54 0 a of the mattress is the air inlet 52 3 b, and the air passage 5 5 Two

The opening of 3a is an air blower b 5 2 3c. The direction in which the core plate 52 1 is displaced is such that the air outlet 52 3 c twists in the opposite direction to the rotation direction 7 with respect to the air inlet 5 23 b. Is done. Thus, when the core 52 rotates, an air flow is formed from the air inlet 52 b to the air outlet 52 c.

In FIG. 3, reference numeral 910 denotes a brush, and brush 910 includes a rear bracket 70, which is provided by a retainer (not shown) and a bolt (not shown). Fixed to 0. Reference numeral 564 denotes a bearing for supporting the rear end of the armature shaft 510, and the bearing 564 is fitted into the recess of the rear bracket 700. ing. Reference numeral 501 denotes a yoke, and reference numeral 550 denotes a field magnetic pole arranged on the inner peripheral surface of the yoke 501. One end of the yoke 501 is fitted to the rear bracket 700, and the other end is fixed to the center bracket 81 including the speed reduction mechanism 300. It is. Also, part of the electric motor 500 The block 501 is divided by a sun bracket 81 and a partition wall 800.

The front end of the key shaft 510 is connected to the speed reduction mechanism 300. Reference numeral 22 1 denotes a mechanical spring formed on the outer periphery of the output shaft 220 so that the one-way clutch 350 can slide in the front-rear direction. It is mated. 250 is a pinion locking ring that regulates the axial movement of the pinion 200 coupled to the one-way clutch 350, and 450 is the output shaft. The bearing for bearing 0 is fitted on the inner peripheral surface of a hole formed in the front of the housing 400. 21 is a resin molded lever, one end of which is connected to the plunger 6100 of the magnet switch 600 and the other end is connected to the rear of the one-way clutch 350. Has been done. Reference numeral 63 denotes a lead wire for connecting the magnet switch 600 and the brush 910, and the end of the magnet switch 600 on the side of the wire is provided with a nut. It is fixed to the cap 61 by the set 62. Reference numeral 72 denotes a ventilation pipe fitted to the rear bracket 700, through the ventilation hole 71 of the rear bracket 700, and inside the rear bracket 700. Is connected to

(Actuation)

When the magnet switch 600 is energized by turning on a key switch (not shown), the brassiere passes through the lead wires 63 The voltage is applied to the shear 910, and the armature 540 rotates. The rotation of the armature 540 is decelerated by the speed reduction mechanism 300 and transmitted to the one-way clutch 350. On the other hand, when the magnet switch 600 is energized, the plunger 61 moves rightward in FIG. 3 and the one-way clutch is moved via the lever 21 as shown in FIG. Moving to the left, the combined pinion 200 moves to the left in FIG. 3 and engages with an engine ring gear (not shown).

In the present embodiment, a punch shaft 523 formed in the core plate 521 is formed during rotation of the armature 540. The twisted air passages around 10 5 2 3 a make it possible for the armature 540 to form a blower. τ

To achieve.

In other words, due to the suction force generated at the front end portion 540a of the armature by the rotation of the armature 540, the shock 501 and the sun bracket are formed. External air flows through the gap between the air vent and the ventilation hole at the front end of the yoke 501, not shown, and the center bracket 81, not shown. The air is sucked into the front side of the mater core 520, and this air is drawn by the twisted air passages 523a inside the armature 540, and the rear end of the mater core is formed. Sent in the direction of 540b. The air blows away the abrasion powder of the brush 910 and the commutator 51 while ventilating the ventilation holes 71 or the rear end of the yoke 501 (not shown). Drained outside the starting motor through the hole. As a result, wear powder does not accumulate on the armature 540, the yoke 501, the bearings 564 of the rear bracket 700, etc. The risk of leakage and the poor sliding of the sleeve support 564 are reliably eliminated.

Friction heat generated by the sliding contact between the brush 910 and the connector 51 also passes through the radially inner side of the coil 530 of the armature 540, and the brush heats. The air flows toward the contact portion between the sheath 910 and the commutator 51, and is cooled well. The heat generated at the contact between the brush 910 and the commutator 51 heats the entire armature 540 through the coil 530. However, heat is radiated well to the accelerating airflow from the inner peripheral surface of the punched hole 52 3 of the core plate 52 1.

In the above-described embodiment, the adjacent core plate 52 1 is connected to the adjacent core plate 52 1 by one slot pitch (slot) in the circumferential direction. If the number of lots is 25, it is shifted by 14.4 degrees), but it may be shifted by a small angle, for example, 3 degrees. In this case, the slot is also twisted in the circumferential direction, but the armature coil may be wound around it.

In addition, even if the shape and number of the punched holes 5 2 3 of the core plate 5 2 1 are not changed, the air blows in the same way as when laminating. Easy to quantity P P96 515

8

It can be adjusted. From this, the same core plate 5 2 1 is used to reduce the number of laminations, and the amount of heat generated and the generation of abrasion powder change, such as armatures with different torque settings. Even if you can.

(Example 2)

Another embodiment will be described with reference to FIG. However, components having the same functions as those of the other embodiments are denoted by the same reference numerals.

In this embodiment, the punched hole 523 shown in FIG. 1 has a fan-shaped cross section, but other cross-sectional shapes are naturally possible.

(Example 3)

Another embodiment will be described with reference to FIGS. However, the components having the same functions as those of the other embodiments are denoted by the same reference numerals.

The mode of this embodiment is the same as that of the embodiment 1 except that the armature coil 5 is extended to the small diameter side along the rear end surface of the armature core 52. 30 is a starter motor with a disc-shaped commutator and coil end, which uses the coil end portion 53 0a as a commutator piece. It is pressed in the axial direction toward the end section 530a.

The circular commutator / coupling coil section 530a will be further described. The coil end portion 530a is composed of a predetermined number of inner conductors 534 and a predetermined number of outer conductor groups 533 which are individually adhered to both sides of a resin plate without a sign. Consists of The inner conductors 4 are arranged in a spiral disk shape and are separated from each other by a spiral shape. It is provided. The outer conductors 5 3 5 are arranged in a spiral disk shape and are separated from each other by a spiral gap, and their surfaces are in sliding contact with the brush 9 10. ing. The radial outer end of each inner conductor 534 is individually connected to the end of the lower conductor of the mating core 520 in the slot, and the diameter of each outer conductor 533 is The outer end in the direction is individually connected to the end of the upper conductor of the armature core 520 in the slot. Then, the radial inner end of each inner conductor 533 and the radial inner end of each outer conductor 533 -

9

Are welded individually to form the coin end portion 530a.

In this type of armature 520, the spiral gap 536 between the outer conductors 533 adjacent to each other forms an air passage of a kind of centrifugal fan. In other words, the cooling air accelerated by the gap 533 flows in the centrifugal direction.

Therefore, in the present embodiment, the airflow blown out to the brush-side end face of the mating core 52 by the air passages 52 a causes the inner and outer conductors 5. It is guided to the outside of the outer conductor 535 in the radial direction through the radially inner sides of 3 4 and 5 3 5, and is then sent in the centrifugal direction through the gap 536 described above, and the brush 9 1 In addition to cooling the outer conductors 5 and 5 that form the commutator pieces, the brush wear powder can be blown off satisfactorily. Industrial applicability

As described above, the rotor of the rotating electric machine according to the present invention is useful as a starting motor for an internal combustion engine, and is particularly suitable for a rotor that needs to improve cooling performance. .

Claims

The scope of the claims

1. A rotating shaft rotatably supported by the housing, a core plate having a punched hole laminated thereon and fitted to the rotating shaft, and a rotor core wound around the rotor core. Wherein the punched holes communicate with each other to form an air passage.

The rotor of a rotary electric machine, wherein the air passage is formed by being displaced in the circumferential direction by twisting each core plate to one side in the circumferential direction.

2. One end face of the rotor core at which the outlet of the air passage opens is provided with a coil end portion of the coil extending outside the rotor core and a brush for supplying power. The rotor of the rotary electric machine according to claim 1, which faces the rotor.

3. The rotor for a rotating electric machine according to claim 2, wherein the rotor has a commutator that slides on the brush.

4. The rotor of the rotating electric machine according to claim 3, wherein the rotating electric machine is a starting motor.

5. The housing has an air discharge hole in communication with the internal space on the brush side facing the one end face of the rotor, and has an air outlet facing the other end face of the rotor. The rotor for a rotating electrical machine according to claim 3, further comprising an air inflow hole communicating with the internal space on the brush side.

6. The rotary electric machine according to claim 1, wherein each of the core plates is divided into a plurality of groups, and any two of the groups adjacent to each other are shifted by a predetermined slot pitch in a circumferential direction. Rotor.

7. A predetermined number of the core plates adjacent to each other are shifted by less than the I-slot pitch in a circumferential direction with respect to the other adjacent core plates, and The rotor of a rotary electric machine according to claim 1, wherein the slot is formed by being twisted to one side in a circumferential direction.