JP2002136051A - Rotating machine and rotor thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cooling efficiency with simple construction at low cost. SOLUTION: A rotating machine 2 comprises a rotor 4 in which the rotor 4 fitted with a rotating shaft 12 and having a circular circumferential face and side faces includes a main part 20 made by non-magnetic material and a permanent magnet 16 and a magnetic member 18 held by the main part 20, case members 6 and 8 supported relatively rotatably on the rotating shaft 12 of the rotor 4, and a stator 10 supported by the case member 6 and 8 so as to cover the outer circumferential face of the rotor 4. A plurality of fins 5 are arranged on the side faces of the rotor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor having a rotating shaft integrally mounted thereon and having a circular outer peripheral surface and both side surfaces, and a main body made of a nonmagnetic material and a plurality of permanent magnets held by the main body. And a rotor including a magnetic member, a case means rotatably supported on a rotating shaft of the rotor, and a stator supported by the case means to cover an outer peripheral surface of the rotor. Machine and its rotor.

[0002]

2. Description of the Related Art In a rotating machine, for example, a generator, when the rotor of the generator is changed from an electromagnetic coil type to an Nd-Fe-B type permanent magnet type, an Nd-Fe-B type permanent magnet is used. Due to being a permanent magnet with strong magnetic force,
Even with generators of the same size, the amount of power generation can be increased. On the other hand, when the amount of power generation is the same, it is possible to make the generator compact. When the amount of power generation is increased while the size of the generator is the same, the amount of heat generated by the iron loss of the stator and the amount of heat generated by the winding formed of a bundle of copper wires arranged on the stator also increase. If the amount of heat generated by the iron loss of the stator and the amount of heat generated by the windings increase, the electrical resistance of the windings increases, which reduces the amount of power generation and shortens the life of the windings, leading to a reduction in reliability. Become. On the other hand, when the generator is made compact with the same amount of power generation, iron loss increases due to an increase in magnetic flux density, and the wire diameter of the winding disposed on the stator, that is, the cross-sectional area decreases. As a result, the electric resistance value of the winding increases, causing the same problem as described above.

[0003]

In order to solve the above-mentioned problems, conventionally, a stator core (laminated electromagnetic steel sheet) has been used.
Means for increasing the cross-sectional area and increasing the wire diameter of the windings to reduce the electric resistance value, or means for cooling the stator with water to increase the cooling efficiency have been adopted. However, in the former method, since the size of the stator must be increased, the size of the generator is increased and the cost is increased. Also, the latter means requires a forced circulation of cooling water through the stator, which complicates the structure,
This leads to higher costs. The above-described problem also exists in the electric motor among the rotating machines.

[0004] It is an object of the present invention to provide a novel rotating machine and its rotor, which can improve the cooling efficiency with a simple structure and at low cost, and improve the performance with the same size.

It is another object of the present invention to provide a novel rotating machine and its rotor which can improve the cooling efficiency with a simple structure and at low cost, and can be made compact with the same performance.

Other objects and features of the present invention will become apparent from the following description of embodiments of a rotating machine and a rotor configured according to the present invention, which are described in detail with reference to the accompanying drawings.

[0007]

According to one aspect of the present invention, there is provided a rotor having a rotating shaft integrally mounted thereon and having a circular outer peripheral surface and both side surfaces, wherein the rotor comprises a main body made of a non-magnetic material and a main body. Rotation comprising: a rotor including a plurality of held permanent magnets and a magnetic member; case means supported rotatably on a rotation axis of the rotor; and a stator supported by the case means to cover an outer peripheral surface of the rotor. A plurality of fins extending axially and extending substantially radially on one side and / or the other side of the rotor. Rotating machine is provided. The case means includes one end wall and the other end wall rotatably supported by the rotation shaft on both axial sides of the rotor, and at least one ventilation hole is formed in each of the one end wall and the other end wall. Is preferred. Preferably, the case means includes an outer peripheral wall arranged to cover a radially outer side of the rotor, and the outer peripheral wall is preferably formed with at least one ventilation hole.

According to another aspect of the present invention, there is provided a rotor for a rotating machine having a rotating shaft integrally mounted thereon and having a circular outer peripheral surface and both side surfaces, wherein the main body is made of a non-magnetic material and held by the main body. In a rotor of a rotating machine including a plurality of permanent magnets and a magnetic member formed on one side and / or the other side, a plurality of fins extending in an axial direction and extending in a substantially radial direction are circumferentially spaced. Is arranged in the
A rotor of a rotating machine is provided.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a rotating machine and a rotor thereof according to the present invention will be described below in more detail with reference to the accompanying drawings. In FIGS. 1 to 6, substantially the same parts are denoted by the same reference numerals. Referring to FIGS.
The generator, which is a rotating machine generally designated by reference numeral 2, has a rotor 4
, A pair of case members 6 and 8, and a stator 10. The rotor 4 includes a rotating shaft 12 integrally mounted via a sleeve 14, a plurality of permanent magnets 16, a plurality of magnetic members 18, and a main body 20. Each of the permanent magnets 16 and each of the magnetic members 18 are
0 are integrally held. More specifically,
Each of the permanent magnets 16 is completely embedded in the main body 20,
Further, each of the magnetic members 18 is configured such that only the outer end face in the radial direction is exposed and all other surfaces are embedded in the main body 20. The main body 20 of the rotor 4 is made of aluminum, which is a nonmagnetic material, and the sleeve 14, the permanent magnet 16, and the magnetic member 18 are integrally embedded by die casting to form a substantially circular outer peripheral surface. It is formed to have both side surfaces extending perpendicular to the axial direction. The sleeve 14 is positioned so as to have a common axis with the outer peripheral surface of the main body 20. The rotating shaft 12 is attached to the main body 20 via the sleeve 14 by being press-fitted and attached to the sleeve 14. Rotary axis 1
2, the length is defined such that it protrudes outward by a predetermined length from both side surfaces of the main body 20 in the axial direction. On both side surfaces of the rotor 4, a plurality of fins 5 extending in the axial direction and extending substantially in the radial direction are arranged at intervals in the circumferential direction. Each of the fins 5 is formed integrally with the main body 20 by die casting. As shown in FIG. 5, each of the fins 5 is formed to extend linearly in the radial direction.

As described above, the plurality of permanent magnets 16 and the plurality of magnetic members 18 are integrally embedded in the main body 20. The permanent magnet 16 and the magnetic member 18 are
0 and are radially arranged at equal pitches alternately in close contact with each other in the circumferential direction. Each of the magnetic members 18 is composed of a plurality of electromagnetic steel sheets having substantially the same shape, in the embodiment, a stacked body of a plurality of silicon steel sheets. Magnetic member 1
Each of 8 has a radially outer end face having an arc shape concentric with the rotation shaft 12, a radially inner end face extending linearly in a tangential direction, and both circumferential side faces extending in a radial direction. ing. At the center in the circumferential direction of the inner end surface, a protrusion 18a for retaining that protrudes radially inward is formed so as to extend over the entire area in the axial direction. Each of the magnetic members 18 is formed with a protruding portion 18 b that extends radially outward from each of the permanent magnets 16. Outward of each radially outer end face of the permanent magnet 16 is a projection 18.
A space (space for filling the body) for filling the body 20 in the circumferential direction is formed by each of the b. A radially inner portion 1 of each of the magnetic members 18 with respect to the protrusion 18b;
8c, the permanent magnet 16 is inserted in the circumferential direction.
A space to be held (a space for inserting and holding a permanent magnet) is formed. Each of the Nd—Fe—B permanent magnets 16
It is inserted and held in each of the permanent magnet insertion / holding spaces in a non-magnetized state.

The main body 20 has a space (substantially annular space) between a radially inner side of each of the permanent magnets 16 and the magnetic member 18 and an outer peripheral surface of the sleeve 14 and a space for filling the main body. It is arranged so as to fill the space and cover both sides in the axial direction of each of the permanent magnets 16 and each of the magnetic members 18 with a predetermined thickness. Each of the permanent magnets 16 is completely embedded in the main body 20, and each of the magnetic members 18 is exposed only in the radially outer end face, and all other surfaces are embedded in the main body 20. In addition, each of the non-magnetized permanent magnets 16 is magnetized from the exposed surface of each of the magnetic members 18.

Each of the portions of the rotating shaft 12 protruding outward from both side surfaces of the main body 20 is provided with a radial ball bearing (hereinafter simply referred to as a "bearing") as a bearing.
22 and 24 are press-fitted and mounted. A pair of case members 6 and 8 are rotatably supported on the rotating shaft 12 via bearings 22 and 24 on both sides in the axial direction of the main body 20. The case members 6 and 8 are rotatably supported by the rotating shaft 12 by press-fitting through holes formed in the case members 22 and 24, respectively. A stator 10 is mounted between the pair of case members 6 and 8 so as to cover the outer peripheral surface of the main body 20 of the rotor 4 with a gap.

One of the case members 6 includes an end wall 6a extending in a direction perpendicular to the rotating shaft 12, and an annular flange portion 6b extending axially from a peripheral edge of the end wall 6a. No. The other case member 8 includes another end wall 8a extending in a direction perpendicular to the rotation shaft 12 and an annular flange portion 8b extending in the axial direction from the periphery of the other end wall 8a, and has a substantially cap shape as a whole. No. Spline teeth (females) are formed on the inner peripheral surface of the annular flange portion 6b of the one case member 6 in the axial direction and the inner peripheral surface of the annular flange portion 8b of the other case member 8 in the axial direction. One end wall 6a of one case member 6 and the other end wall 8a of the other case member 8 have
A plurality of ventilation holes 6c and 8c are respectively formed. A plurality of ventilation holes 6d and 8d are formed in the annular flange portion 6b of one case member 6 and the annular flange portion 8b of the other case member 8, respectively. Ventilation hole 6d
And one of the ventilation holes 8d are formed at the lower ends of the annular flange portions 6b and 8b, and also serve as drain holes. Boss portions 6e projecting outward in the radial direction are formed at two locations on the outer peripheral portion of one case member 6, and each of the boss portions 6e is formed with a mounting hole 6f to a stationary frame (not shown). A boss 8e projecting outward in the radial direction is formed at one position on the outer peripheral portion of the other case member 6, and a winding 32 held by a stator 10 described later is inserted into and held in each of the bosses 8e. Holding holes 8f are provided. Relatively small bosses 6g and 8g projecting outward in the radial direction are formed at four positions on the outer peripheral portion of each of the annular flange portion 6b and the annular flange portion 8b, and each of the boss portions 6g and 8g has a mounting hole ( A screw hole 6h and a mounting hole (through hole) 8h are formed. One case member 6 and the other case member 8 configured as described above are arranged such that the distal ends of the annular flange portion 6b and the annular flange portion 8b face each other with an interval in the axial direction. . In a state where the case members 6 and 8 are arranged so as to face each other in the axial direction as described above, the spline teeth of the annular flange portions 6b and 8b are positioned on the common axis with the rotary shaft 12, and the boss portions 6g and Each of the mounting holes 6h and 8h of each of the 8g is positioned so as to be aligned and opposed to each other on a common axis.

The substantially cylindrical stator 10 is integrally formed from a magnetic material such as an iron material or a steel material, or is integrally formed from a laminated body such as an iron plate or a steel plate (in the embodiment, integrally formed from a steel material). ing). Slots 30 extending in the axial direction are formed at intervals in the circumferential direction in the stator 10 configured as described above. Slot 3
Each of the reference numerals 0 is formed on the inner peripheral surface of the stator 10 and on both side surfaces in the axial direction, and is formed so as to expand toward the outside in the radial direction when viewed from the axial direction. A winding 32 made of a bundle of copper wires is inserted and held in each of the slots 30. Spline teeth (male) are formed on the outer peripheral surface (circular outer peripheral surface) at both axial ends of the stator 10. Stator 10 configured as described above
Each of the spline teeth is fitted and supported by a spline tooth at the tip of each of the annular flange portion 6b of the one case member 6 and the annular flange portion 8b of the other case member 8. Each of the annular flange portions 6b and 8b is tightened between the boss portions 6g and 8g, which face each other in the axial direction, in a direction approaching each other in the axial direction by a plurality of elongated screws (not shown). It is mounted and supported in the form of being held in the axial direction. The above-described one case member 6 including the one end wall 6a and the annular flange portion 6b, the other case member 8 including the other end wall 8a and the annular flange portion 8b, and each of the screws (not shown) The case means is rotatably supported on the rotating shaft 12. Further, the annular flange portions 6b and 8b of the one case member 6 and the other case member 8 constitute an outer peripheral wall (that is, an outer peripheral wall of the case means) arranged so as to cover a radially outer side of the rotor 4.

A cooling fan 3 is provided at one end of the rotating shaft 12.
4 and a pulley 36 for rotational driving are integrally mounted by bolts 38. The pulley 36 is drive-coupled to a drive source, for example, a crankshaft of an engine, via a V-belt and other power transmission means (not shown). Note that FIG.
In FIG. 2, reference numeral 40 denotes an annular seal plate. The seal plate 40 covers a plurality of screws 42 (in FIG. 2) inside one end wall 6a of one of the case members 6 so as to cover the inside of the bearing 22 in the axial direction. Are shown only one). As is easily understood from FIG.
The radially inner axial height of each of the fins 5 formed on one side surface (the left side surface in FIG. 2) of the rotor 4 is formed slightly lower than that on the radially outer side. , Screws 42 to avoid interference.

Referring to FIG. 2, in the rotating machine 2 which is a generator constructed as described above, when the engine is operated, the rotor 4 is driven to rotate via the power transmission means, the pulley 36 and the rotating shaft 12. As a result, a current is generated in the windings 32 disposed on the stator 10, and power generation is performed.
When the engine is stopped, the rotation of the rotor 4 is stopped,
Power generation is stopped.

As described above, a plurality of fins 5 extending in the axial direction and extending in the radial direction are integrally formed on both side surfaces of the rotor 4 at circumferential intervals. The rotor 4 itself is air-cooled by each of the fins 5, and the rotation of each of the fins 5 sucks in air from the radial inside and discharges the air toward the radial outside. Since this air is blown to the portion of the winding 32 of the stator 10 arranged to cover the outer peripheral surface of the rotor 4, the portion of the winding 32 is forcibly air-cooled. In the above-described embodiment, a plurality of ventilation holes 6c and 8c are formed in one end wall 6a of one case member 6 and the other end wall 8a of the other case member 8, respectively.
Inflow and discharge of air into and from the internal space are effectively performed, and heat generated by iron loss of the stator 10 and heat generated by the windings 32 of the stator 10 can be effectively released from the internal space of the rotating machine 2 to the outside. become. As a result, the heat effect on the windings 32, the magnetic member 18 of the rotor 4, the permanent magnets 16, the bearings 22 and 24, etc. is reduced to improve the cooling efficiency and improve the power generation efficiency, durability and reliability. be able to. In the above embodiment, a plurality of ventilation holes 6d and 8d are also formed in the annular flange portion 6b of the one case member 6 and the annular flange portion 8b of the other case member 8, respectively. The inflow and outflow of air are performed more effectively, and the cooling efficiency is further improved.

Each of the fins 5 in the rotor 4 is
Since it can be molded integrally with the main body 20 by die casting, molding is extremely easy. Further, since the structure is very simple, the cooling efficiency can be improved at low cost. Due to the heat generated by the core loss of the stator 10 and the heat generated by the windings 32 of the stator 10 being effectively released to the outside, an increase in the electric resistance value of the windings 32 is minimized, and a predetermined power generation And winding 3
2 is guaranteed and the reliability is sufficiently ensured. Therefore, according to the rotating machine 2 and the rotor 4 included therein, the cooling efficiency can be improved with a simple structure and low cost, and the performance (power generation efficiency) can be improved with the same size. In addition, cooling efficiency can be improved with a simple structure and low cost, and compactness can be achieved with the same performance. In the above embodiment, the cooling fan 34 is mounted on the rotating shaft 12 near the one end wall 6a of the case member 6 where the ventilation hole 6c is formed. 12, bearings 22 and 2
4. The internal space surrounded by the one case member 6, the other case member 8, and the stator 10 can be forcibly ventilated and air-cooled, so that a higher cooling effect can be obtained. A plurality of fins 5 are formed in the rotor 4, and ventilation holes 6c, 6d and 8c, 8d are formed in the internal space.
Is formed, the use of a relatively small cooling fan 34 can provide a sufficient cooling effect, and the output for rotating the cooling fan 34 can be suppressed low. is there. If a desired cooling effect can be obtained by the plurality of fins 5 formed on the rotor 4,
The cooling fan 34 can be omitted, and the economic effect is further improved.

As described above, the rotating machine 2 and the rotor 4 included therein according to the present invention have been described in detail based on the embodiments with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various other changes and modifications may be made without departing from the scope of the invention. For example, in the above embodiment, each of the fins 5 formed on both side surfaces of the rotor 4 is configured to extend linearly in the radial direction, but the above-described blowing function can be obtained. Any shape may be used. For example, FIG. 6 shows that each of the fins 5 configured to extend linearly in the radial direction is bent at an equal angle in the same circumferential direction as viewed in the axial direction, near the radially outer end. Another embodiment of the rotor 4 is shown, which is formed to extend linearly outwardly in the radial direction. FIG. 7 also shows that each of the fins 5 is formed only in the vicinity of the outer peripheral edge on both side surfaces of the rotor 4.
Is shown. In the embodiment shown in FIG. 7, each of the fins 5 is shorter than in the other embodiments, and is each formed with respect to an imaginary straight line extending radially through the axis when viewed in the axial direction. Are formed so as to extend linearly outward in the radial direction at the same angle in the same circumferential direction. FIG. 8 shows another embodiment in which each of the fins 5 does not extend linearly in the radial direction, but extends spirally in the radial direction.

In the above embodiment, the plurality of fins 5
Are formed on both side surfaces of the rotor 4, but there are other embodiments formed on one side or the other side instead. By forming a plurality of fins 5 on one side or the other side, the configuration can be further simplified if a predetermined cooling effect can be obtained. Furthermore, in the above embodiment, a plurality of ventilation holes 6c and 8c are formed in one end wall 6a of one case member 6 and the other end wall 8a of the other case member 8, respectively. There are other embodiments in which the ventilation holes 6c and 8c are formed (therefore, in a broad concept, at least one each is formed in the one end wall 6a and the other end wall 8a). Furthermore, in the above embodiment, the plurality of ventilation holes 6d and 8d are formed in the annular flange portion 6b of the one case member 6 and the annular flange portion 8b of the other case member 8, respectively. Another embodiment in which the ventilation holes 6d and 8d are formed, or the annular flange portion 6b or the annular flange portion 8
There is still another embodiment in which one ventilation hole 6d or 8d is formed in b. (Therefore, in a broad concept, if at least one ventilation hole 6d or 8d is formed in the outer peripheral wall of the case means, Good).

Further, in the above-described embodiment, the rotor 4 includes a rotating shaft 12 integrally mounted via a sleeve 14, a plurality of permanent magnets 16, and a plurality of magnetic members 18.
And the main body 20, wherein each of the permanent magnets 16 is completely buried in the main body 20, and each of the magnetic members 18 has only a radially outer end face exposed, and all other surfaces are in the main body 20. The main body 20 is made of non-magnetic aluminum, and the sleeve 14, the permanent magnets 16 and the magnetic members 18 are integrally embedded by die casting to form a substantially circular shape. It is formed to have an outer peripheral surface to be formed and both side surfaces extending perpendicularly to the axial direction. However, the present invention is not limited to the configuration in which the configuration of the rotor is applied only to the rotating machine according to the above-described embodiment, and includes a rotor in a claw-pole type rotating machine, and a rotation including a rotor in various other forms. It is possible to apply to the machine. In short, the rotating body portion that protrudes radially outward from the rotating shaft and is integrally rotated with the rotating shaft and includes a permanent magnet, a magnetic member, and the like (in the above embodiment, each of the sleeve 14, the main body 20, and the permanent magnet 16) , A rotor having a rotating body portion formed of each of the magnetic members 18, and the rotor is positioned such that the outer peripheral surface of the rotating body portion is covered with a gap on the inner peripheral surface of the stator. Regardless, the present invention is applicable.

Furthermore, in the above-described embodiment, the rotating machine 2 is a generator. Alternatively, even if the rotating machine 2 is a motor having substantially the same configuration as the rotating machine 2, substantially the same operation and effect as described above can be obtained. It goes without saying that it can be obtained. However,
The above-mentioned "improvement in power generation efficiency" is replaced by "increase in output" in the motor. Furthermore, in the above embodiment, the case means is constituted by one case member 6 and the other case member 8, and the housing space for the rotor 4 and the like is formed such that the stator 10 is sandwiched between the two. Therefore, the stator 10 also constitutes one member constituting the accommodation space, and thus is configured so that the outer peripheral surface thereof is exposed to the outside. Instead of this configuration,
In some embodiments, the entire stator 10 is completely covered by the case member.

[0023]

According to the rotating machine and the rotor thereof according to the present invention, the cooling efficiency can be improved with a simple structure and low cost.
It allows to improve performance at the same size. In addition, the cooling efficiency is improved with a simple structure and low cost, and compactness is enabled with the same performance.

[Brief description of the drawings]

FIG. 1 is a side view showing a main part of a rotating machine according to the present invention.

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

FIG. 3 is an enlarged sectional view taken along the line BB of FIG. 2;

FIG. 4 is a plan view showing a state in which a radial ball bearing is mounted on a rotating shaft of a rotor according to the present invention provided in the generator shown in FIGS. 1 to 3;

FIG. 5 is a sectional view taken along the line CC of FIG. 4;

FIG. 6 is a sectional view showing another embodiment of the rotor according to the present invention, and is a sectional view similar to FIG. 5;

FIG. 7 is a sectional view showing still another embodiment of the rotor according to the present invention, and is a sectional view similar to FIG. 5;

FIG. 8 is a sectional view showing still another embodiment of the rotor according to the present invention, and is a sectional view similar to FIG. 5;

[Explanation of symbols]

 Reference Signs List 2 generator 4 rotor 5 fin 6 one case member 6a one end wall 6c, 6d ventilation hole 8 the other case member 8a other end wall 8c, 8d ventilation hole 10 stator 12 rotating shaft 16 permanent magnet 18 magnetic member 20 main body 32 winding line

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02K 5/18 H02K 5/18 5/20 5/20 F term (Reference) 5H002 AA08 AB07 AB09 AC01 AC06 AC10 AD03 AD05 AE07 AE08 5H605 AA01 BB01 CC02 CC09 DD07 DD12 EA02 EB10 FF01 GG02 5H609 BB05 PP02 PP07 QQ02 QQ08 QQ14 QQ15 QQ17 RR06 RR08 RR10 RR16 RR24 RR27 RR36 RR42 5H622 AA03 CA05 PP03

Claims (4)

[Claims] 1. A rotor having a rotating shaft integrally mounted thereon and having a circular outer peripheral surface and both side surfaces, the rotor including a main body made of a nonmagnetic material, a plurality of permanent magnets held by the main body, and a magnetic member. A case means rotatably supported on the rotating shaft of the rotor, and a stator supported on the case means to cover the outer peripheral surface of the rotor. The rotating machine according to claim 1, wherein a plurality of fins extending in the axial direction and extending substantially in the radial direction are arranged at intervals in the circumferential direction. 2. The case means includes one end wall and the other end wall rotatably supported on the rotation shaft on both axial sides of the rotor, and at least one end wall on the one end wall and the other end wall, respectively.
The rotating machine according to claim 1, wherein the plurality of ventilation holes are formed. 3. The case means includes an outer peripheral wall disposed so as to cover a radially outer side of the rotor, and at least one ventilation hole is formed in the outer peripheral wall. Rotating machine. 4. A rotor of a rotating machine having a rotating shaft integrally mounted thereon and having a circular outer peripheral surface and both side surfaces, wherein a main body made of a non-magnetic material, a plurality of permanent magnets and a magnetic material held by the main body are provided. In a rotor of a rotating machine including a member, a plurality of fins extending in an axial direction and extending substantially in a radial direction are disposed on one side and / or the other side at circumferentially intervals. , A rotor of a rotating machine.