JP2000245109A - Permanent magnet motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To promote heat transmission on the surface of a causing, and to improve cooling performance by arranging a housing outside the causing so as to surround the casing via a prescribed space between, and providing lead-in guides for leading running wind into this space and exhausting guides for exhausting the running wind. SOLUTION: A housing 7 is arranged so as to surround a easing 3 via a prescribed space between and an annular swing air course 27 is formed in the peripheral surface and both side surfaces of the casing 3. Along with partitioning the course 27 by forming axial partition walls 29, lead-in guide 31 for taking running wind in and exhausting guides 33 for exhausting the running wind are connected. Consequently, it becomes possible to efficiently suppress temperature increase of the motor body 1, by causing the running wind taken in from intakes 31a of the lead-in guides 31 to pass the partitioned passages partitioned by the partition walls 29, and to flow along the annular swing air courses 27, and exhausting the wind from the exhausting ports of the exhausting guides 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent magnet motor suitable for a main motor of a railway car, for example.

[0002]

2. Description of the Related Art In recent years, in order to reduce running costs and reduce noise, a main motor of a railway vehicle has a starting part completely covered with a housing or a shell rather than an open type in which the starting part is exposed to the outside. So-called fully-closed motors have become mainstream. This tendency is not limited to railcars, and the same requirements are applied to motors mounted on electric vehicles and hybrid cars.
It is shifting to a fully closed type, part of which is covered by a housing.

[0003] By the way, when the vehicle main motor itself is covered with a motor housing or the like, naturally the heat from the motor tends to stay in the motor housing. This leads to a significant decrease in performance. For this reason, at present, a large number of fins are provided on the outer wall of the housing to increase the surface area thereof, and it is attempted to suppress a rise in temperature inside the housing due to heat radiation from the fins.

[0004]

However, even if a large number of radiating fins are protruded on the outer wall surface of the housing in order to suppress a rise in the temperature inside the housing, the radiating effect corresponding to the radiating fins cannot be expected so much. It is.

[0005] In view of this situation, the present invention
It is an object of the present invention to provide a permanent magnet motor capable of obtaining high cooling performance.

[0006]

According to a first aspect of the present invention, a stator having an armature coil fixed to a fixed stator core and a permanent magnet are provided. While a rotatable rotor provided on an iron core is arranged, the casing surrounds the casing so as to form a predetermined space outside the casing, and an introduction guide for introducing traveling wind into the space; A housing having a discharge guide for discharging the wind to the outside is provided.

[0007] Thus, while noise can be reduced by the housing surrounding the casing, the traveling wind flows in the space, so that heat transfer on the casing surface is promoted. At the same time, since a permanent magnet is used, it is not necessary to supply a current for generating a magnetic force, and the amount of heat generated is small, so that the temperature of the motor body can be increased. According to the second aspect of the present invention, the stator core is provided. Is exposed in the space where the traveling wind flows.

As a result, the stator core directly exchanges heat with the traveling wind flowing in the space, thereby greatly improving the cooling performance.

According to a third aspect of the present invention, a space is provided so that a casing and a housing are concentrically arranged, and a swirling air path for turning a traveling wind taken from an introduction guide in a circumferential direction along the casing. Shape.

[0010] Thus, the traveling wind taken in from the introduction guide can be swirled in the circumferential direction to flow, so that the flow resistance can be reduced and the pressure loss can be reduced. As a result, the traveling wind can be efficiently taken in.

According to the fourth aspect of the present invention, the casing and the housing are eccentrically arranged such that the cross-sectional area of the air passage is smaller in the downstream portion than in the vicinity of the introduction port, and the space is taken in from the introduction guide. The traveling wind is swirled in the circumferential direction along the casing to form a swirling air path.

As a result, the flow velocity in the downstream area is increased, so that the heat transfer coefficient in the downstream area is increased, and the cooling performance is improved.

According to a fifth aspect of the present invention, the casing is made of a non-magnetic material, and the end coil of the stator located at the axial end of the stator is brought into direct contact with the casing.

Thus, the end coil of the stator can be brought into direct contact with the casing made of a non-magnetic material, and together with the cooling of the stator, the heat transfer coefficient is greatly improved and the cooling performance is improved. .

According to a sixth aspect of the present invention, the stator core is formed by stacking punched plates provided with a plurality of projections projecting into the space along the circumferential direction of the outer peripheral surface.

[0016] Thus, when the traveling wind flows in the space, the flow is disturbed by the projections, so that the heat transfer coefficient increases. Further, the cooling area can be improved by increasing the transmission area due to the projections.

According to a seventh aspect of the present invention, the stator core is formed by stacking punched plates with fixing bolts,
3. The permanent magnet motor according to claim 2, wherein a head of the fixing bolt projects into a space along a circumferential direction.

[0018] In this way, it is possible to form a protruding portion that protrudes into the space by using the head of the fixing bolt formed by stacking the stator cores. As a result, the flow of the traveling wind by the head is disturbed, thereby increasing the heat transfer coefficient and improving the cooling performance.

According to an eighth aspect of the present invention, the stator core is provided with a plurality of axially penetrating ventilation holes.
A cooling fan for sending air toward the ventilation holes is provided on a rotating shaft of the rotor.

Thus, the cooling fan forcibly flows the cooling air through the ventilation holes of the stator core, thereby cooling the inside of the stator core, thereby improving the cooling performance.

According to the ninth aspect of the present invention, the ventilation holes penetrating in the axial direction are formed by stacking punched plates having different diameters of the ventilation holes.

As a result, a portion having a different cross-sectional area of the air passage is formed in the air passage, which serves to promote turbulence, thereby promoting heat transfer efficiency and improving cooling performance.

According to the tenth aspect of the present invention, the introduction guide opening of the introduction guide is provided with a filter for preventing entry of an obstacle or the like.

Thus, it is possible to prevent large papers, debris, and the like, which hinder the intake of the traveling wind, from entering the introduction guide, so that the traveling wind can be reliably taken.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a motor main body mounted on a vehicle or the like. The motor main body 1 includes a drive unit 5 arranged in the casing 3 and a housing 7 surrounding the casing 3.

The casing 3 is formed of a non-magnetic material in a cylindrical shape, and has a drive unit 5 disposed therein.

The driving section 5 is composed of a stator 9 and a rotatable rotor 11 arranged in the stator 9.
As shown in FIG. 2, the stator 9 has a structure in which an armature coil 15 is annularly arranged on a stator core 13, and the stator core 13 is directly fixed and supported on the inner peripheral wall surface of the casing 3. .

As shown in FIG. 1, the left and right terminal coils 17 of the stator 9 are arranged in a thin recess 19 of the casing 3.
The heat transfer coefficient is improved by thinning.

The rotor 11 is made of a substantially cylindrical mild steel S45C,
Alternatively, both ends are rotatably supported by bearings 21 such as bearings made of a magnetic material such as a laminated silicon steel plate having a substantially circular shape.

The rotor 11 has, as shown in FIG.
Although the structure of the quadrupole rotor is such that the core portion between the cavities 23 is a magnetic pole portion with an interval of the magnetic pole width, it is not necessarily specified as the quadrupole rotor.

In order to form magnetic irregularities between the magnetic pole portion and the portion between the magnetic poles, a permanent magnet 25 having a rectangular cross section is provided in each hollow portion 23 at the side surface of the magnetic pole portion (the circumferential end surface of the hollow portion).
Are fixedly supported by, for example, an adhesive.

By using a rare earth magnet having a high magnetic energy product, for example, an NdFeB magnet as a material of the permanent magnet 25, a higher torque can be obtained than with a conventional permanent magnet.

The housing 7 is supported by the bearing 21 and is arranged concentrically so as to surround the casing 3 with a predetermined space. Thereby, an annular swirling air passage 27 is formed on the outer peripheral surface and both side surfaces of the casing 3.

As shown in FIGS. 1 and 2, the swirling air passage 37 is divided into six bottom regions by an axial partition wall 29, and is provided in first, third, and fifth partition walls from the left side of the drawing. Is an introduction guide 31 formed in a duct shape for taking in outside air.
Are connected respectively.

Discharge guides 33 formed in a discharge duct shape are connected to the second, fourth, and sixth partition walls, respectively.

The numbers of the introduction guides 31 and the discharge guides 33 may be set as appropriate.

As shown in FIG. 2, the connecting portion between the introduction guide 31 and the housing 7 has a partition wall 29 and a top plate 35 extending to the peripheral wall surface of the casing 3 so as to cover the upper part of the partition wall 29. Thereby, the introduction guide port 31a of the introduction guide 31
The traveling wind taken in from the air passes through a partition passage partitioned by a partition wall 29 as shown by an arrow, and an annular turning air passage 27 is formed.
360 degrees along the line.

In this case, as shown in FIG. 4, a filter portion 37 made of a wire mesh for preventing obstacles such as large paper and debris from entering the introduction guide 31 is provided at the introduction guide port 31a of the introduction guide 31. Is desirably provided.

As a result, it is possible to prevent an obstacle from entering the introduction guide 31 and to cause clogging, so that a reliable and stable wind can be taken in.

On the other hand, as shown in FIG. 3, the connecting portion of the discharge guide 33 with the housing 7 has a partition wall 29 and a top plate 39 extending to the peripheral wall surface of the casing 7 so as to cover the upper side of the partition wall 29. Thereby, the traveling wind taken in from the introduction guide 31 flows along the swirling air path 27 as shown by the arrow, and then passes through the partition passage partitioned by the partition wall 29 and out of the discharge guide opening 33a of the discharge guide 33. It is being discharged.

According to the permanent magnet motor configured as described above, noise can be reduced by the housing 7 surrounding the casing 3, and the upper half of the housing 7 has no cooling fins, so that it is mounted on a vehicle or the like. Becomes easier. on the other hand,
During traveling, traveling wind is taken in from the introduction guide 31, and the taken traveling wind turns 360 degrees around the casing 3 along the swirl air path 27, and is then discharged outside from the discharge guide 33. At this time, since the traveling wind is a flow turning in the circumferential direction, the flow resistance can be reduced, the pressure loss can be reduced, and the traveling wind can be efficiently taken in. At the same time, the heat transfer coefficient on the surface of the casing 3 is promoted, and the heat exchange between the stator 9 and the end coil 17 that are in direct contact with the casing 3 is performed at the same time. In this case, since the permanent magnet 25 is used for the rotor 11, it is not necessary to supply a current for generating a magnetic force, so that the cooling performance can be improved due to the small amount of heat generation.

FIG. 5 shows a second embodiment in which the cooling performance is improved by the swirling air passage 27. That is,
The axial center of the housing 7 is arranged eccentrically with respect to the axial center of the casing 3 so that the downstream area of the swirl air path 27 has a narrower cross-sectional area in the downstream area than in the vicinity of the inlet.

Since the other components are the same as those of the first embodiment, the same reference numerals are given and the detailed description is omitted.

Therefore, according to the second embodiment, the traveling wind taken in from the introduction guide 31 has a high flow velocity in the downstream portion where the cross-sectional area of the air passage is narrow, so that the heat transfer in the downstream portion region is performed. The rate is increased and the cooling performance is improved.

In this case, when the traveling wind turning in the circumferential direction flows toward the discharge duct 33, the velocity of the traveling wind gradually decreases, but in a region where the velocity of the traveling wind decreases, the traveling wind having a low temperature is close to the inlet on both sides. The cooling effect does not significantly decrease due to the flowing effect, and the cooling performance can be improved as a whole.

FIG. 6 shows a third embodiment in which the cooling performance is improved by directly exchanging heat between the stator core 13 and the traveling wind.

That is, by removing the peripheral wall surface of the casing 3,
The structure is such that the outer peripheral surface of the stator core 13 of the stator 9 directly faces the swirling air passage 27 through which the traveling wind flows.

Since the other components are the same as those of the first embodiment, the same reference numerals are given and the detailed description is omitted.

Therefore, according to the third embodiment, since the stator core 13 directly exchanges heat with the traveling wind, the cooling performance is greatly improved.

FIG. 7 shows a fourth embodiment in which the heat transfer area of the stator core 13 is enlarged and the cooling performance is improved.

That is, on the outer peripheral surface of the stator core 13 of the stator 9, a plurality of convex portions 41 are provided which directly remove the peripheral wall surface of the casing 3 and face the swirling air passage 27 through which the traveling wind flows.

When the stator core 13 is formed by stacking punched plates having the protrusions 41 to a predetermined thickness, the protrusions 41
It will be made at the same time.

Since the other components are the same as those of the first embodiment, the same reference numerals are given and the detailed description is omitted.

Therefore, according to the fourth embodiment, when the traveling wind flows, the flow is disturbed by the convex portion 41, so that the heat transfer coefficient increases. Further, the cooling performance can be improved in combination with the increase in the heat transfer area due to the convex portions 41.

In this case, as shown in FIG.
When the stator core 13 is formed by stacking punched plates with the fixing bolts 43, the head 45 of the fixing bolts 43 may have a shape facing the inside of the swirl air passage 27, as in the fourth embodiment. Action and effect can be expected.

FIG. 9 shows a fifth example in which the running air flows through the stator core 13 to improve the cooling performance.
1 is an embodiment of the present invention.

That is, a plurality of ventilation holes 47 penetrating the stator core 13 in the axial direction are provided along the circumference, while the inside of the housing 7 is directly in contact with the outer peripheral surface of the stator core 13 projecting from the casing 3. A sub-housing 49 that is in contact with the sub-housing 49 is provided, and the swirling air path 27 through which the traveling wind flows is formed between the housing 7 and the sub-housing 49. Further, a cooling air passage 51 through which the cooling air flows through the ventilation hole 47 is formed between the sub-housing 49 and the casing 3.

An inlet 53 is provided at one side of the cooling air passage 51.
Discharge ports 55 are provided on the other side, and by the rotation of the cooling fan 53 provided on the rotating shaft 11a of the rotor 11, the cooling air is forced to flow through the cooling air passage 51 as shown by the arrow. I have.

On the other hand, as shown in FIG. 11, the ventilation holes 47 formed in the stator core 13 are formed by alternately laminating two types of punched plates 57 and 59 having different hole diameters so as to protrude inward. The shape is made.

Since the other components are the same as those of the first embodiment, the same reference numerals are given and the detailed description is omitted.

Therefore, according to the fifth embodiment,
The running air flowing through the swirling air passage 27 and the cooling air flowing through the cooling air passage 51 can simultaneously cool the inside of the stator core 13 through the ventilation hole 47 and the outer peripheral surface. At the same time, when the cooling air passes through the ventilation holes 47, the flow is disturbed by the projections 61, so that the cooling efficiency is improved and the cooling of the stator core 13 can be enhanced.

[0063]

As described above, according to the permanent magnet motor of the present invention, the following effects can be obtained.

(1) Low noise can be achieved by the housing surrounding the whole, and the traveling wind flowing in the housing
By using the permanent magnet, the amount of heat generated by the motor can be reduced, and the temperature of the motor body can be suppressed from increasing.

(2) The stator core can be directly heat-exchanged against the traveling wind, so that the cooling performance can be improved.

(3) The flow resistance from the introduction guide can be reduced, and the traveling wind can be efficiently taken in.

(4) It is possible to increase the flow velocity in the downstream portion and increase the size of the heat transfer portion in the downstream region, thereby improving the cooling performance.

(5) The end coils can be cooled simultaneously with the stator core, and the cooling performance can be improved.

(6) The turbulence of the running wind can be generated by the projections, and the cooling performance can be improved.

(7) It is possible to simultaneously cool the outer peripheral surface of the stator core and the inside of the stator core via the ventilation holes, thereby improving the cooling performance.

(8) It is possible to prevent intrusion of obstacles such as large paper and debris, and it is possible to take in the traveling wind reliably.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a permanent magnet electric motor according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is an explanatory diagram in which a filter unit is provided at an introduction guide opening of the introduction guide.

FIG. 5 is a cross-sectional view similar to FIG. 3, in which an axis of a housing is eccentrically arranged with respect to an axis of a casing according to a second embodiment of the present invention.

FIG. 6 is an explanatory view in which a stator core according to a third embodiment of the present invention can directly exchange heat with running wind.

FIG. 7 is an explanatory view in which a protrusion is provided on a stator core according to a fourth embodiment of the present invention.

FIG. 8 is an explanatory view in which a projection is provided using a head of a fixing bolt for laminating a stator core.

FIG. 9 is an explanatory view showing that an outer peripheral surface and an inside of a stator core according to a fifth embodiment of the present invention can be simultaneously cooled.

FIG. 10 is an explanatory diagram in which ventilation holes are provided in a stator core.

FIG. 11 is a partially enlarged view taken along line CC of FIG. 10;

[Explanation of symbols]

 Reference Signs List 3 Casing 7 Housing 9 Stator 11 Rotor 13 Stator core 15 Armature coil 25 Permanent magnet 27 Space (turning air path) 31 Introduction guide 33 Discharge guide

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazuto Sakai 2-4 Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture F-term in Toshiba Keihin Works (reference) 5H609 BB03 BB19 PP01 PP05 QQ02 QQ10 QQ13 QQ15 QQ18 RR10 RR13 RR27 RR38 RR43

Claims (10)

[Claims] In a casing, a stator having an armature coil on a fixed stator core and a rotatable rotor having a permanent magnet provided on an iron core are arranged, and a predetermined rotor is provided outside the casing. Permanently provided with a housing that surrounds the casing so as to create a space, and has an introduction guide for introducing a traveling wind into the space and a discharge guide for discharging the introduced traveling wind to the outside. Magnet motor. 2. The permanent magnet motor according to claim 1, wherein an outer peripheral surface of the stator core is directly exposed in a space in which traveling wind flows. 3. The space, wherein the casing and the housing are arranged concentrically, and have a swirling air path shape for turning traveling wind taken from an introduction guide in a circumferential direction along the casing. Item 3. The permanent magnet electric motor according to any one of Items 1 and 2. 4. A space, wherein a casing and a housing are eccentrically arranged so that a cross-sectional area of an air passage is smaller in a downstream portion than in a vicinity of an introduction port. 3. The permanent magnet motor according to claim 1, wherein the permanent magnet motor has a shape of a swirling air path for turning. 5. While the casing is made of a non-magnetic material,
The stator end coil located at the axial end of the stator,
The permanent magnet motor according to claim 1, wherein the permanent magnet motor is brought into direct contact with the casing. 6. The permanent magnet according to claim 2, wherein the stator core is formed by stacking punched plates provided with a plurality of projections projecting into the space along the circumferential direction of the outer peripheral surface. Electric motor. 7. The stator core is formed by stacking punched plates with fixing bolts, and a head of the fixing bolt is projected into a space along a circumferential direction. 2. The permanent magnet electric motor according to 2. 8. The stator core, wherein a plurality of ventilation holes penetrating in the axial direction are provided in the stator core, and a cooling fan for sending air toward the ventilation holes is provided on a rotating shaft of the rotor. 3. The permanent magnet electric motor according to any one of 1 and 2. 9. The permanent magnet motor according to claim 2, wherein the ventilation holes penetrating in the axial direction are formed by stacking punched plates having different diameters of the ventilation holes. 10. The permanent magnet electric motor according to claim 1, wherein a filter portion for preventing entry of an obstacle or the like is provided in the introduction guide opening of the introduction guide.