JP2003259576A - Rotor structure of inner rotor type generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor structure of an inner rotor type generator which is highly reliable in durability and capable of improving and stabilizing overall output voltages. <P>SOLUTION: A rotor 1 comprises a rotor core 10 structured by stacking disc-shaped thin plates of a magnetic material in the axial direction, magnet inserting holes 14, a plurality of axial-direction holes cut at a prescribed interval in the rotor rotating direction at the outside position of the radial direction of the rotor core 10, which enable a plurality of magnets M to be inserted into the rotor core 10 by inserting the magnets M into each hole 14, and grooves 17 concavely formed in an outside circumferential surface 16 of the rotor core 10 and extending in the axial direction between the holes 14 neighboring each other in the rotational direction of the rotor. This structure fixes the magnets M into the rotor core 10 firmly, improves the reliability in the durability of the rotor 1, and improves an output voltages totally. Also, by improving the output voltages of a low current side in particular, the output voltages are stabilized at high values. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor structure of an inner rotor type generator in which a stator is arranged opposite to the outer circumference of a rotating rotor.

[0002]

2. Description of the Related Art Conventionally, as an engine generator, there is an inner rotor type generator in which a stator is arranged opposite to the outer periphery of a rotating rotor, as disclosed in, for example, Japanese Patent Laid-Open No. 8-223853.

6 and 7 are views for explaining the structure of a rotor of a conventional inner rotor type generator, FIG. 6 is an explanatory view showing a cross section along the axial direction of the rotor, and FIG. 7 is a rotor. It is explanatory drawing which shows the cross section orthogonal to the axial direction of.

As shown in FIG. 6, a rotor 101 includes a rotor shaft 102 coaxially connected to a crankshaft (not shown) of an engine, and a rotor core 103 fixed to the rotor shaft 102 so as to be rotatable integrally therewith. have. The rotor core 103 is configured by stacking a plurality of disc-shaped thin plates made of a magnetic material in the axial direction and fixing them with four fixing bolts 104, and a short-axis cylinder whose axial length is shorter than the diameter. The outer peripheral surface 105 of the rotor core 103 is formed with concave portions 107 for loading the magnets 106 at predetermined intervals in the rotation direction.

The magnet 106, as shown in FIG.
By mounting the rotor core 103 in the recessed portion 107, the rotor core 103 has a curved shape that is flush with the outer peripheral surface 105 of the rotor core 103. The outer peripheral surface 105 side has an N pole and the rotation center side has an S pole, and the outer peripheral surface 105 side has a curved shape. There are two types, S-pole and N-pole on the rotation center side, which are loaded in the recesses 107 so as to be arranged alternately in the rotation direction of the rotor core 103.

Reference numeral 108 shown in FIG. 6 is a pressing plate for preventing the magnet 106 from jumping out in the axial direction. The pressing plates 108 are arranged in pairs so as to sandwich the rotor core 103 from the outside in the axial direction. Are fixed to the rotor core 103 together.

Reference numeral 110 is a tape wound on the outer peripheral surface 105 of the rotor core 103 in order to prevent the magnet 106 from jumping outward in the radial direction due to the centrifugal force of rotation. The conventional magnet 106 is fixed to the rotor core 103 by fixing the magnet 106 to the concave portion 10
7 and loaded with adhesive and then tape 110
Was wound on the outer peripheral surface 105 of the rotor core 103.

[0008]

However, when the adhesive 110 and the tape 110 are wound, the adhesive is peeled off due to vibration or the like, and the rotating centrifugal force causes the magnet 106 to move outward in the radial direction to move from the rotor core 103. There was a risk of separation, and there was concern about durability and reliability. Further, since the tape 110 is used, the component cost is increased, and the assembly cost is also increased due to the increase in the number of manufacturing processes. Further, in the case of the rotor 103 having the above-described shape, the degree of output voltage drop particularly on the low current side was large, and the overall stability was lacking.

The present invention has been made in view of the above points, and an object thereof is a rotor of an inner rotor type generator having high durability and reliability, capable of improving and stabilizing the output voltage as a whole. To provide the structure.

[0010]

In order to achieve the above object, a rotor structure of an inner rotor type generator according to a first aspect of the present invention is an inner rotor type generator in which a stator is arranged opposite to the outer periphery of a rotating rotor. In a rotor structure of a generator, a rotor includes a rotor core formed by stacking disc-shaped thin plates made of a magnetic material in an axial direction, and a plurality of rotor cores arranged at predetermined positions in a radial direction outer side of the rotor core in a rotor rotation direction. Magnet insertion holes that are bored in the axial direction and in which a plurality of magnets can be inserted into the rotor core by inserting magnets, respectively, and magnets that are recessed in the outer peripheral surface of the rotor core and that are adjacent to each other in the rotor rotation direction. And a groove portion extending in the axial direction between the insertion holes.

According to the present invention, a plurality of magnets can be attached to the rotor core by inserting the magnets into the axial magnet insertion holes formed in the rotor core at predetermined intervals in the rotor rotation direction. it can. Therefore, the magnet can be reliably fixed to the rotor core without using a conventional adhesive or tape, and the durability and reliability of the rotor can be improved.

Further, according to the present invention, the groove portion is recessed on the outer peripheral surface of the rotor core so as to extend axially between the magnet insertion holes adjacent to each other in the rotor rotation direction. By providing this groove, it is possible to improve the output voltage as a whole, particularly to improve the output voltage on the low current side, and to stabilize the output voltage at a higher value as a whole. The fact that the groove having the above shape has the above effect was obtained by the inventor through various experiments.

According to a second aspect of the present invention, in the rotor structure of the inner rotor type generator according to the first aspect, the groove extends rearward in the rotor rotational direction from a predetermined position on the outer peripheral surface of the rotor core to the rearward side in the rotor rotational direction. It is characterized in that it has a notch cut out in the shape of an inclined plane that gradually approaches the center in the radial direction as it moves toward the center.

According to the present invention, the notch is provided from the predetermined position on the outer peripheral surface of the rotor core to the groove located rearward in the rotor rotation direction, and the notch moves toward the rear side in the rotor rotation direction. Therefore, it has an inclined plane shape gradually approaching the radial center. By providing the cutout portion and the groove portion described in claim 1, it is possible to improve the output voltage as a whole, in particular, the output voltage on the low current side can be improved, and it is possible to improve the overall output voltage at a higher value. Can be stabilized. The fact that the cutout portion and the groove portion having the above-mentioned shape have the above-mentioned effect is obtained by the inventor through various experiments.

According to a third aspect of the invention, in the rotor structure of the inner rotor type generator according to the second aspect, the length of the cutout portion in the rotor rotation direction is the distance between the groove portions adjacent to each other in the rotor rotation direction. It is characterized in that the length is set to about 1/3.

According to the present invention, the invention described in claim 2 is specifically limited. According to this, the length of the notch portion in the rotor rotation direction is about 1 of the distance between the adjacent groove portions. The length is set to / 3. According to this shape
The output voltage can be improved as a whole, especially the output voltage on the low current side can be improved, and the output voltage can be stabilized at a higher value as a whole. The fact that the length of the cutout portion in the rotor rotation direction has the above-mentioned effect is obtained by the inventor through various experiments.

According to a fourth aspect of the invention, in the rotor structure of the inner rotor type generator according to the second or third aspect, the notch portion is about 10 in the tangential direction of the outer peripheral surface of the rotor core.
It is characterized by having a slope gradient of degrees.

The present invention specifically limits the invention described in claim 2 or 3, and according to this, the notch portion is about 10 degrees with respect to the tangential direction of the outer peripheral surface of the rotor core. It has a slope gradient. According to this shape
The output voltage can be improved as a whole, especially the output voltage on the low current side can be improved, and the output voltage can be stabilized at a higher value as a whole. The fact that the inclination gradient of the cutout portion has the above effect is obtained by the inventor through various experiments.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view schematically showing the outer appearance of the rotor 1 in the present embodiment, and FIG.
3 is a cross-sectional view showing a cross section taken along line AA of FIG. 3, and FIG. 3 is a cross-sectional view showing a cross section taken along line BB of FIG.

The rotor 1 in the present embodiment is used for an inner rotor type generator in which a stator (not shown) is arranged to face the outer periphery of the rotor 1.

The rotor shaft 2 of the rotor 1 is coaxially connected to a crankshaft of an engine (not shown), and the other end is provided with a magnet cover (not shown) via a bearing 3.
It has a structure that is rotatably supported by. As shown in FIG. 2, a through hole 4 is formed at the center of the shaft of the rotor shaft 2, and the end of the through hole 4 on the crankshaft side is fitted with the shaft end of the crankshaft. As a result, a tapered hole 4a for supporting the rotor shaft 2 coaxially with the crankshaft is formed. By inserting a through bolt (not shown) into the through hole 4 and screwing the tip into the shaft end of the crankshaft, the rotor shaft 2 can be coaxially connected to the crankshaft. A rotor core 10 is attached to the rotor shaft 2 so as to have the same center of rotation as the rotor shaft 2.

The rotor core 10 is a disk-shaped thin plate made of a magnetic material (in this embodiment, a silicon steel plate having a plate thickness of 0.5 mm).
Are laminated in the axial direction, and have a short-axis cylindrical shape whose axial length is shorter than the diameter. Then, as shown in FIG. 3, the rotor shaft 2
Is provided with a center hole 11 into which is fitted, a bolt hole 12 for a fixing bolt 5 for assembling and fixing thin plates in a laminated state, and a lightening hole 13 for reducing weight. This rotor core 10
A plurality of magnets M are inserted into the rotor core 1 by inserting magnets M into the rotor core 1 at radial outer positions at predetermined intervals in the rotor rotation direction.
A magnet insertion hole 14 that can be inserted into the No. 0 is formed.

The magnet insertion hole 14 has a substantially elongated rectangular opening shape extending in a direction orthogonal to the radial direction of the rotor core 10. The magnet insertion hole 14 has the same shape as this opening shape and extends in the axial direction. Existence Further, in the present embodiment, a total of eight magnet insertion holes 14 are formed so as to form the eight-pole type rotor 1.
Is provided.

The magnet M has a substantially flat plate shape that can be fitted into the magnet insertion hole 14 from the side of the rotor core 10 along the axial direction and is fixedly held in the magnet insertion hole 14 by the insertion. ing. Further, it is configured to have an N pole on one surface orthogonal to the radial direction of the rotor core 10 and an S pole on the other surface while being inserted into the magnet insertion hole 14,
The poles and the S poles are inserted into the respective magnet insertion holes 14 so as to alternately face in the radial direction. Therefore, the magnet M can be securely fixed to the rotor core 10 without using an adhesive or a tape as in the conventional case, and the durability reliability of the rotor 1 can be dramatically improved as compared with the conventional case.

A plurality of groove portions 17 are provided on the outer peripheral surface 16 of the rotor core 10. The groove portion 17 is provided so as to extend in the axial direction at a position between the magnet insertion holes 14 that are adjacent to each other in the rotor rotation direction, extends along the hole wall surface of the magnet insertion hole 14, and faces each other. It has a pair of inclined surfaces. In this embodiment, the inclined surfaces have a V-shaped groove shape having an inclination of about 60 degrees.

Further, on the outer peripheral surface 16 of the rotor core 10,
A cutout portion 18 is provided from a predetermined position on the outer peripheral surface 16 to a groove portion 17 located rearward in the rotor rotation direction. The notch 18 has an inclined plane shape that gradually approaches the radial center as it moves rearward in the rotor rotation direction. The length of the cutout portion 18 in the rotor rotation direction is
Approximately 1/3 of the distance L between the grooves adjacent to each other in the rotor rotation direction
Is set to the length (L / 3). Also, the notch 18
Are inclined so as to have an inclination of about 10 degrees with respect to the tangential direction of the outer peripheral surface 16 of the rotor core 10.

Reference numeral 19 shown in FIG. 2 indicates the rotor core 1.
0 from both sides in the axial direction, the magnet M has a magnet insertion hole 1
4 is a pressing plate that suppresses jumping out of the rotor core 10 in the axial direction. The pressing plate 19 is fixed together with the rotor core 10 by a fixing bolt 5 that fixes the rotor core 10 by assembling.

FIG. 4 is a table showing experimental results for comparing the power generation performances of the rotor 1 having the above structure and the conventional rotor 101 (see FIGS. 6 and 7), and FIG. 5 is a graph thereof. Is. According to the results of this experiment, the rotor 10 of the conventional type is better when the rotor 1 of the present embodiment is used.
It can be seen that the voltage value of the output voltage is higher than that of 1. Further, in the conventional type, the output voltage changes abruptly on the low voltage side, whereas in the case of the rotor 1, the output voltage particularly on the low current side improves and the output voltage changes gradually. It can be seen that the overall value is stable at a high value.

According to the rotor structure of the inner rotor type generator described above, the rotor 1 is a plurality of axial holes formed at predetermined intervals in the rotor rotation direction, and the magnets M are inserted into the holes. Since the plurality of magnets M have the magnet insertion holes 14 through which the magnets M can be inserted into the rotor core 10, by inserting the magnets M into the magnet insertion holes 14, the magnets M can be easily and reliably fixed and held on the rotor core 10. Can be made. Therefore, the durability reliability of the rotor 1 can be dramatically improved as compared with the conventional one using an adhesive or tape. Further, since it is not necessary to use an adhesive or a tape unlike the conventional case, the cost of parts can be reduced, and further, the manufacturing cost can be reduced by omitting the step of adhering the magnet M to the rotor core 10 at the time of manufacturing and assembling. Therefore, the unit price of the product can be reduced.

Further, the rotor 1 has a groove portion 17 which is provided on the outer peripheral surface 16 of the rotor core 10 and extends axially between the magnet insertion holes 14 which are adjacent to each other in the rotor rotation direction. Has a notch portion 18 extending from a predetermined position on the outer peripheral surface 16 to a groove portion 17 located rearward in the rotor rotation direction, and the notch portion 18 gradually approaches the radial center as it moves rearward in the rotor rotation direction. Since it is formed in the inclined flat surface shape, the output voltage can be improved as a whole, especially the output voltage on the low current side can be improved, and the output voltage can be stabilized at a higher value.

In particular, the length of the cutout portion 18 in the rotor rotation direction is set to about 1/3 of the distance between the adjacent groove portions 17, and the inclination gradient of the cutout portion 18 is set to the outer peripheral surface of the rotor core. By setting about 10 degrees with respect to the tangential direction, the output voltage can be improved as a whole, especially the output voltage on the low current side can be improved, and the overall value can be stabilized at a higher value. It is possible to obtain favorable results.

The present invention is not limited to the above-mentioned embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, in the above, the magnet M is 8
Although the so-called 8-pole type rotor 1 having one unit has been described as an example, the number of poles may be changed.

The shape of the groove 17, the length of the cutout 18, and the inclination gradient of the cutout 18 are suitable shapes obtained by the inventor through various experiments, and the number of poles and the magnetic force of the magnet M are obtained. It can be changed as appropriate.

[0034]

As described above, according to the rotor structure of the inner rotor type generator of the present invention, a plurality of axial magnet insertion holes are formed at predetermined intervals in the rotor rotation direction of the rotor core. Since multiple magnets can be inserted into the rotor core by inserting the magnets into the rotor core respectively, the magnets can be securely fixed to the rotor core without using conventional adhesives or tapes, and the durability and reliability of the rotor can be improved. Can be improved.

Further, since the groove portion is provided in the outer peripheral surface of the rotor core so as to extend in the axial direction between the magnet insertion holes adjacent to each other in the rotor rotation direction, the output voltage is improved as a whole. In particular, the output voltage on the low current side can be improved, and the output voltage can be stabilized at a high value as a whole.

Further, a notch is provided from a predetermined position on the outer peripheral surface of the rotor core to a groove located rearward in the rotor rotation direction, and the radial center gradually increases as the notch moves rearward in the rotor rotation direction. Since it has a slanted plane shape that is close to, it is possible to improve the output voltage as a whole, in particular, to improve the output voltage on the low current side and stabilize it at a higher value.

[Brief description of drawings]

FIG. 1 is an explanatory diagram schematically showing the outer appearance of a rotor according to the present embodiment.

FIG. 2 is a cross-sectional view showing a cross section taken along the line AA of FIG.

FIG. 3 is a cross-sectional view showing a cross section taken along the line BB of FIG.

FIG. 4 is a table showing experimental results for comparing the power generation performances of a rotor to which the present invention is applied and a conventional rotor.

5 is a graph of FIG.

FIG. 6 is a diagram illustrating a structure of a rotor of a conventional inner rotor type generator.

FIG. 7 is a diagram illustrating a structure of a rotor of a conventional inner rotor type generator.

[Explanation of symbols]

1 rotor 10 rotor core 14 Magnet insertion hole 16 outer peripheral surface 17 Groove 18 Notch

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Misao Suzuki             Fuji, 7-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo             Heavy Industry Co., Ltd. (72) Inventor Masafumi Matsuda             1-20-12 Tarumachi, Kohoku Ward, Yokohama City, Kanagawa Prefecture               Suruga Electric Co., Ltd. F-term (reference) 5H002 AA01 AB08 AC06                 5H622 AA03 CA02 CA07 CA10 CB05                       PP03 PP11 PP17

Claims (4)

[Claims] 1. A rotor structure of an inner rotor type generator in which a stator is arranged opposite to the outer periphery of a rotating rotor, wherein the rotor is formed by stacking disc-shaped thin plates made of a magnetic material in an axial direction. And a plurality of magnets are inserted into the rotor core by inserting magnets into the rotor core, which are axial holes formed at predetermined positions in the radial direction outside of the rotor core at predetermined intervals in the rotor rotation direction. An inner rotor having a possible magnet insertion hole, and a groove portion that is provided on the outer peripheral surface of the rotor core and that extends axially between the magnet insertion holes that are adjacent to each other in the rotor rotation direction. Type generator rotor structure. 2. A notch in the shape of an inclined plane that gradually approaches the radial center as it moves from the predetermined position on the outer peripheral surface of the rotor core toward the rear in the rotor rotation direction over a groove portion located rearward in the rotor rotation direction. The rotor structure of the inner rotor type generator according to claim 1, wherein the rotor structure has a notch. 3. The length of the cutout portion in the rotor rotation direction is about 1 of the distance between the groove portions adjacent to each other in the rotor rotation direction.
The rotor structure of the inner rotor type generator according to claim 2, wherein the length is set to / 3. 4. The rotor structure for an inner rotor type generator according to claim 2, wherein the cutout portion has an inclination gradient of about 10 degrees with respect to a tangential direction of the outer peripheral surface of the rotor core. .