JP6425081B2 - Rotor of electric rotating machine - Google Patents

Description

  The present invention relates to improvement of a rotor of a rotating electrical machine mounted, for example, on an automobile or a truck and used as an electric motor or a generator.

  As a conventional electric rotating machine, a rotation having a stator on which a stator coil is wound, a Lundell-type core disposed opposite to the inner peripheral side of the stator, and a field coil wound on the Lundell-type core One having a child is generally known. The usual Lundell core used here is a boss that flows the field flux in the axial direction at the inner side in the radial direction of the field coil, and a field flux which extends radially outward from the axial outer end of the boss. By assembling a pair of pole cores each having a disc portion for flowing the magnetic flux in the radial direction and a plurality of claw pole portions extending in the axial direction so as to surround the field coil from the disc portion to exchange magnetic flux with the stator core. It is configured. The claw poles of one pole core and the claw poles of the other pole core are circumferentially staggered. This conventional Lundell core is assembled by axially combining a pair of pole cores manufactured respectively from massive soft magnetic cores with the field coil interposed therebetween.

  In this Lundell core, a magnet combined Lundell core is known in which permanent magnets are interposed in gaps between claw poles adjacent in the circumferential direction in order to strengthen the magnetic flux of the claw poles. For example, in Patent Document 1, the permanent magnet disposed in the gap between the first and second claw pole portions adjacent in the circumferential direction is shifted to one side in the circumferential direction, and the circumferential odd number permanent magnet and the circumferential even number It has been proposed to arrange the permanent magnets alternately in the axial direction by a predetermined distance.

JP 2007-89383 A

  By the way, in said patent document 1, the permanent magnet is attached in order to reduce the 3rd harmonic of magnetic flux with respect to a Lundell type | mold core, and it is not considered in the magnetic circuit surface. For example, since the permanent magnet disposed in the gap between the first and second claw pole portions adjacent in the circumferential direction is biased toward the tip end side of either claw pole portion in the axial direction, the permanent magnet is disposed The magnetic pole on the tip side of the other claw pole portion is not fully utilized as a magnetic circuit.

  In addition, since the permanent magnet disposed in the gap between the first and second claw pole portions is biased to the tip end side of one of the claw pole portions in the axial direction, there is magnetic saturation of the magnetic pole around the permanent magnet It is considered to be disadvantageous in demagnetization and cooling of the permanent magnet. Furthermore, since the permanent magnets disposed in the gap between the first and second claw pole portions are alternately displaced by a predetermined distance in the axial direction, the axially unbalanced structure cools the field coil. It affects sex.

  The present invention has been made in view of the above circumstances, and it is possible to effectively utilize the tip of the claw pole portion for a magnetic circuit to improve the performance and the cooling performance while reducing the magnetic noise. It is an object of the invention to provide a rotor of a rotating electric machine.

The first invention made to solve the above problems is
First the field coil (13) is wound on to the field flux projecting first boss portion that flows in the axial direction (121), radially outward from an axial end in the circumferential direction by a predetermined pitch of the first boss portion A first pole core (12) having a disk portion (122) and a first claw pole portion (123) extending axially from the tip of each of the first disk portions and surrounding the field coil;
A second boss portion (141) in which a field coil (13) is wound and field flux flows in the axial direction, and a second boss portion which protrudes radially outward at a predetermined pitch in the circumferential direction from an axial end of the second boss portion . disc portion (142), have a second Tsumekyoku portion surrounding the field coil extending in the axial direction from the tip end of each of said second disc section (143) and facing said first pole core A second pole core (14) to be arranged ;
The first claw pole portion is interposed between the first claw pole portion and the second claw pole portion alternately arranged in the circumferential direction to make the first claw pole portion into a first polarity and the second claw pole portion a second permanent magnet you magnetization polarity (15a~15j), the rotor equipped with,
The permanent magnet includes a first permanent magnet disposed at one axial end of the gap and a second permanent magnet disposed at the other axial end, and the first and second claw poles Of the end surfaces on both sides in the circumferential direction, the permanent magnets (15c, 15e) which are in contact with only the end surfaces in the rotational direction of the rotor and abut on the tip sides of the first and second claw pole portions are A material characterized in that the energy product of the magnets is smaller than that of the permanent magnets (15d, 15f) that are in contact with the root side of the first and second claw pole portions .
According to the present invention, the permanent magnet includes the first permanent magnet disposed at one axial end of the gap formed between the first claw pole and the second claw pole, and the other axial end And a second permanent magnet disposed on the Since a permanent magnet is arrange | positioned by this at the front end side of the 1st and 2nd nail pole part, since the tip part of the 1st and 2nd nail pole part where effective utilization is difficult in a magnetic circuit can be used effectively, Performance can be improved. In addition, since the permanent magnet is disposed to be dispersed on the tip side and the root side of the first and second claw pole parts, local magnetic saturation can be alleviated, so that the demagnetization suppression and cooling of the permanent magnet can be suppressed. It is possible to improve the quality. Furthermore, since the permanent magnet is disposed at both axial ends of the gap formed between the first claw pole portion and the second claw pole portion, two permanent magnets disposed at both axial end portions are provided. Since the field coil can be efficiently cooled by the space formed between the magnets, the cooling performance of the field coil can be improved.
Further, the permanent magnet is in contact with only the end surface on the rotation direction side of the rotor among the end surfaces on both sides in the circumferential direction of the first and second claw pole portions. Therefore, since the holding strength of the permanent magnet with respect to the first and second claw pole portions by the rotation of the rotor is secured, the end face of the first and second claw pole portions adjacent to the rotational direction A member such as a magnet protective cover interposed between can be omitted. As a result, simplification of the structure and cost reduction can be achieved.
In addition, the permanent magnet in contact with the tip side of the first and second claw pole parts has a material with a smaller magnetic energy product than the permanent magnet in contact with the root side of the first and second claw pole parts. It is formed of Thereby, cost reduction can be achieved, suppressing the fall of the performance of a permanent magnet in a limited manner.

The second invention made to solve the above problems is
A first boss (121) in which a field coil (13) is wound and field flux flows in the axial direction, and a first boss projecting radially outward from the axial end of the first boss at a predetermined pitch in the circumferential direction A first pole core (12) having a disk portion (122) and a first claw pole portion (123) extending axially from the tip of each of the first disk portions and surrounding the field coil;
A second boss portion (141) in which a field coil (13) is wound and field flux flows in the axial direction, and a second boss portion which protrudes radially outward at a predetermined pitch in the circumferential direction from an axial end of the second boss portion. A disc portion (142) and a second claw pole portion (143) extending in the axial direction from the tip of each of the second disc portions and surrounding the field coil, and facing the first pole core A second pole core (14) to be arranged;
The first claw pole portion is interposed between the first claw pole portion and the second claw pole portion alternately arranged in the circumferential direction to make the first claw pole portion into a first polarity and the second claw pole portion In a rotor of a rotating electrical machine provided with permanent magnets (15a to 15j) magnetized to a second polarity,
The permanent magnet includes a first permanent magnet disposed at one axial end of the gap and a second permanent magnet disposed at the other axial end, and the first and second claw poles It is characterized in that it is in contact only with the end faces on both sides in the circumferential direction of the tip end.
According to the present invention, the permanent magnet includes the first permanent magnet disposed at one axial end of the gap formed between the first claw pole and the second claw pole, and the other axial end And a second permanent magnet disposed on the Since a permanent magnet is arrange | positioned by this at the front end side of the 1st and 2nd nail pole part, since the tip part of the 1st and 2nd nail pole part where effective utilization is difficult in a magnetic circuit can be used effectively, Performance can be improved. In addition, since the permanent magnet is disposed to be dispersed on the tip side and the root side of the first and second claw pole parts, local magnetic saturation can be alleviated, so that the demagnetization suppression and cooling of the permanent magnet can be suppressed. It is possible to improve the quality. Furthermore, permanent magnets, since they are arranged in the axial end portions of the gap formed between the first Tsumekyoku portion and the second Tsumekyoku section, two disposed on both axial ends Since the field coil can be efficiently cooled by the space formed between the permanent magnets, the cooling performance of the field coil can be improved.
Further, the permanent magnet is in contact with only the end surfaces of the tip end portions of the first and second claw pole portions on both sides in the circumferential direction. Therefore, on the opposing surfaces of the first claw pole portion and the second claw pole portion, the tip portions of the first and second claw pole portions having a low magnetic flux density due to the field can be assisted from both sides in the circumferential direction by two permanent magnets. Can be superior as a magnetic circuit.

  In addition, the code | symbol in the parenthesis after each member or site | part described by this column and the claim shows the correspondence with the specific member or site | part as described in embodiment mentioned later, and a patent It has no effect on the configuration of each claim described in the claims.

FIG. 1 is an axial sectional view of an automotive alternator mounted with a rotor according to a first reference example . FIG. 5 is a perspective view of a rotor according to a reference example 1 ; FIG. 7 is a partial front view of the rotor according to a reference example 1 as viewed from the outer peripheral side. It is a figure which shows the magnetic flux density waveform with respect to the axial direction distance of the site | part along the IV-IV line of FIG. 3 on the nail | claw pole part of the pole core which concerns on the reference example 1. FIG. FIG. 10 is a partial front view of the rotor of Comparative Example 1 as viewed from the outer peripheral side. It is a figure which shows the magnetic flux density waveform with respect to the axial direction distance of the site | part along the VI-VI line of FIG. 5 on the nail | claw part of the pole core of the comparative example 1. FIG. It is a graph which shows the result of the 3rd harmonic of the magnetic flux of the rotor of the reference example 1 , and the rotor of the comparative example 1. FIG. FIG. 10 is a partial front view of the rotor according to a reference example 2 as viewed from the outer peripheral side. FIG. 14 is a partial front view of the rotor according to a reference example 3 as viewed from the outer peripheral side. FIG. 2 is a partial front view of the rotor according to Embodiment 1 as viewed from the outer peripheral side. It is XI-XI arrow directional cross-sectional view of FIG. It is XII-XII arrow sectional drawing of FIG. FIG. 16 is a partial front view of a rotor according to a reference example 4 as viewed from the outer peripheral side. It is XIV-XIV line arrow sectional drawing of FIG. It is XV-XV arrow sectional drawing of FIG. FIG. 10 is a partial front view of the rotor according to Embodiment 2 as viewed from the outer peripheral side. FIG. 17 is a cross-sectional view taken along line XVII-XVII in FIG. FIG. 17 is a cross-sectional view taken along line XVIII-XVIII in FIG. FIG. 10 is a partial cross-sectional view of a rotor according to a reference example 5 as viewed from the axial direction.

  Hereinafter, an embodiment of a rotor of a rotating electrical machine according to the present invention will be specifically described with reference to the drawings. In addition, this invention is not limited to the following embodiment, It is possible to change variously in the range which does not deviate from the meaning of this invention.

[ Reference Example 1 ]
An example of a vehicular AC generator mounted with a rotor according to a reference example 1 will be described with reference to an axial sectional view shown in FIG. In FIG. 1, 1 is a rotor, 2 is a stator, 3 is a front frame, 4 is a rear frame, 5 is a pulley, 6 is a slip ring, 7 is a brush device, 8 is a rectifier, and 9 is a regulator.

  The stator 2 is formed by winding a stator coil 22 around a stator core 21 and is fixed to the inner circumferential surfaces of the front frame 3 and the rear frame 4. The front frame 3 and the rear frame 4 are fastened around the stator 2 by bolts, and rotatably support the rotating shaft 11 of the rotor 1 via bearings 31 and 41.

  As shown in FIG. 2, the rotor 1 has a first pole core 12 on the front side fixed to the rotary shaft 11, a field coil 13 (see FIG. 1), a second pole core 14 on the rear side, and a plurality of permanent magnets. It is comprised by magnet 15a, 15b. The first and second pole cores 12 and 14 have the same shape as the pair of pole cores of the conventional Lundell core. That is, the first pole core 12 extends radially outward at a predetermined pitch in the circumferential direction from the axial direction front end portion of the boss portion 121 flowing the field flux axially in the radial direction inner side of the field coil 13. And the first claw pole portion extending axially from the tip of each disk portion 122 so as to surround the field coil 13 to exchange magnetic flux with the stator core 21. And 123. The second pole core 14 also has the same shape as the first pole core 12. However, the boss portion of the second pole core 14 is numbered 141, the disk portion 142, and the second claw pole portion 143. The first and second pole cores 12 and 14 are made of a soft magnetic material.

  The first pole core 12 and the second pole core 14 contact the axial rear end face of the first pole core 12 and the axial front end face of the second pole core 14 such that the respective claw pole portions 123 and 143 are alternately opposed to each other. It is faced and assembled. Thereby, the first claw pole portions 123 of the first pole core 12 and the second claw pole portions 143 of the second pole core 14 are alternately arranged in the circumferential direction. The first and second pole cores 12 and 14 have eight claw pole portions 123 and 143, respectively, to form a 16-pole Lundell type rotor core.

  The field coil 13 is wound around the outer peripheral surfaces of the bosses 121 and 141 of the first and second pole cores 12 and 14 and is surrounded by the first and second claw pole parts 123 and 143. The disc portions 122 and 142 actually have asperities in accordance with the first and second claw pole portions 123 and 143 of eight poles, respectively, and in practice, eight pillar portions are radially arranged. It has the following shape.

As shown in FIGS. 2 and 3, between the first claw pole portions 123 and the second claw pole portions 143 alternately arranged in the circumferential direction, a gap extending obliquely in the axial direction is formed, Permanent magnets 15a and 15b divided into two in the axial direction are respectively disposed at both axial ends of each gap. In the case of the first reference example , a space having an axial length substantially equal to the axial length of the permanent magnets 15a and 15b is formed between the permanent magnets 15a and 15b divided into two in the axial direction. Thereby, the field coil 13 wound around the outer peripheral surface of the bosses 121 and 141 of the first and second pole cores 12 and 14 is exposed to each space. In addition, since the axial direction length of this space part changes with the intensity | strength of permanent magnet 15a, 15b, according to the intensity | strength and the kind of permanent magnet employ | adopted, it sets suitably.

  Each permanent magnet 15a, 15b has a rectangular outer shape, and the end face on the outer side in the axial direction is located on a line connecting the tips and bases of the first and second claw pole portions 123, 143 adjacent in the circumferential direction Is located in The end faces on both sides in the circumferential direction of each permanent magnet 15a, 15b are in contact with the end faces in the circumferential direction of the first and second claw pole portions 123, 143, whereby the first and second claw pole portions 123, It is held at 143. Each permanent magnet 15a, 15b is arranged to magnetize the first claw pole portion 123 to a first polarity and to magnetize the second claw pole portion 143 to a second polarity. For example, when the first claw pole portion 123 is magnetized to the N pole, the second claw pole portion 143 is magnetized to the S pole. The permanent magnets 15a and 15b may be arranged such that the N pole and the S pole are reversed.

  In the automotive AC generator having the above configuration, the rotor 1 rotates in a predetermined direction together with the rotating shaft 11 when the rotational force from the engine is transmitted to the pulley 5 via a belt or the like. In this state, by applying an excitation voltage from the brush device 7 to the field coil 13 of the rotor 1 through the slip ring 6, the first and second claw poles of the first and second pole cores 12, 14 respectively. The portions 123 and 143 are excited to alternately form an NS magnetic pole along the rotational direction of the rotor 1. Thereby, the three-phase alternating voltage can be generated in the stator coil 22, and a predetermined direct current can be extracted from the output terminal of the rectifier 8.

In the case of the first reference example , when the first and second claw pole portions 123 and 143 are excited by application to the field coil 13, for example, in the first claw pole portion 123, a region shown by a mesh pattern in FIG. It becomes a part which performs exchange of magnetic flux with the stator core 21. That is, in the axial direction of the first claw pole portion 123, the mesh pattern area is in the range of approximately 2/3 of the root side. However, in the case of the first reference example , the permanent magnet 15a axially divided into two at both axial ends of the gap between the first claw pole portion 123 and the second claw pole portion 143 adjacent in the circumferential direction. , 15b are arranged. Therefore, a magnetic circuit (a region indicated by hatching in FIG. 3) is formed by these permanent magnets 15a and 15b at the tip of the first and second claw pole portions 123 and 143 to exchange magnetic flux with the stator core 21. Ru. As a result, the tip end portions of the first and second claw pole portions 123 and 143 are effectively used as a magnetic circuit.

FIG. 4 is a magnetic flux density waveform showing the relationship of the magnetic flux density to the axial distance of the portion along the circumferential end surface (IV-IV line in FIG. 3) of the first claw pole portion 123. In the case of the first reference example, since the permanent magnets 15a and 15b which are divided into two in the axial direction are disposed at both axial end portions of the first claw pole portion 123, the magnetic flux density at the arrangement position of the permanent magnet 15a The first peak is present, and the second peak of the magnetic flux density is present at the arrangement position of the permanent magnet 15 b. Moreover, the difference B between the first peak and the second peak is small and averaged as a whole.

  As Comparative Example 1, as shown in FIG. 5, with respect to the permanent magnet disposed in the gap between the first and second claw pole portions 123 and 143 adjacent in the circumferential direction, as shown in the patent document 1, circumferential A different magnet was prepared in that the odd-numbered permanent magnets 150 a and the circumferential even-numbered permanent magnets 150 b were alternately shifted in the axial direction by a predetermined distance. Then, in the same manner as described above, the magnetic flux density waveform showing the relationship of the magnetic flux density to the axial distance of the portion along the circumferential end face (line VI-VI in FIG. 5) of the first claw pole portion 123 was examined. By the way, the result shown in FIG. 6 was obtained.

As apparent from FIG. 6, in the case of Comparative Example 1, since the permanent magnet 150a is disposed only on the axial root side of the first claw pole portion 123, the height of the permanent magnet 150a is high at the axial center There is one peak. In addition, a second peak significantly lower than the first peak is present on the tip end side in the axial direction of the first claw pole portion 123 due to the influence of the permanent magnet 150 b disposed on the other side in the circumferential direction of the first claw pole portion 123 doing. Thus, the difference A between the first peak and the second peak is much larger than the difference B between the first peak and the second peak in the first embodiment .

From the above, in the case of the first reference example , the tip end portions of the first and second claw pole portions 123 and 143 can be effectively used as a magnetic circuit, whereby the performance can be improved. Incidentally, it was investigated by measuring the third harmonic flux that causes the magnetic sound of Reference Example 1 and Comparative Example 1, as shown in FIG. 7, in the case of Reference Example 1 is also equivalent to Comparative Example 1 It can be seen that the third harmonic of the magnetic flux can be reduced.

According to the rotor 1 of the reference example 1 configured as described above, permanent magnets interposed in the gap between the first claw pole portions 123 and the second claw pole portions 143 alternately arranged in the circumferential direction 15a and 15b are divided into two in the axial direction and arranged at both axial ends of the gap. As a result, since the permanent magnets 15a and 15b are disposed on the tip side of the first and second claw pole portions 123 and 143, the tip portions of the first and second claw pole portions 123 and 143 which are difficult to effectively utilize in the magnetic circuit. Performance can be improved.

Further, in the reference example 1 , since the permanent magnets 15a and 15b are disposed to be dispersed on the tip side and the root side of the first and second claw pole portions 123 and 143, it is possible to alleviate the local magnetic saturation. Since it can do, demagnetization of permanent magnet 15a, 15b can be controlled. Furthermore, a space is formed between the permanent magnets 15a and 15b divided into two in the axial direction so that the field coil 13 wound around the outer peripheral surface of the bosses 121 and 141 is exposed to each space. Since the field coil 13 can be cooled efficiently, the cooling performance can be improved.

Further, in the reference example 1 , since the end faces on both sides in the circumferential direction of the permanent magnets 15a and 15b are held by the first and second claw pole portions 12 and 14, the first and second claw pole portions that are weak against centrifugal force Since the tip end portions 12 and 14 can be fixed by the permanent magnets 15a and 15b, the strength against the centrifugal force can be improved.

[ Reference Example 2 ]
In the rotor 1 of the reference example 2 , as shown in FIG. 8, the permanent magnets 15a and 15b disposed in the gap between the first and second claw pole portions 123 and 143 adjacent in the circumferential direction are the first and the second. than the tip of each of 2 Tsumekyoku 123, 143 in that it is arranged at a position protruding axially outward, different from the reference example 1. That is, the permanent magnet 15b disposed on the tip end side of the first claw pole portion 123 is disposed at a position where a part thereof protrudes axially outward beyond the reference line L1 connecting the tip ends of the first claw pole portions 123. ing. Further, the permanent magnet 15a disposed on the tip side of the second claw pole portion 143 is disposed at a position where a part thereof protrudes axially outward with respect to the reference line L2 connecting the tips of the second claw pole portions 143. ing. In addition, since the other structure is the same as the reference example 1 , detailed description is abbreviate | omitted.

According to the rotor 1 of the reference example 2 configured as described above, the same operation and effect as the reference example 1 can be obtained. Furthermore, in the case of Reference Example 2 , since it has the above-described configuration, it is possible to arrange the permanent magnets 15a and 15b in the optimum position according to the axial length and strength of the permanent magnets 15a and 15b to be adopted. Become.

[ Reference Example 3 ]
In the rotor 1 of the reference example 3 , as shown in FIG. 9, the permanent magnets 15a and 15b disposed in the gaps between the first and second claw pole portions 123 and 143 adjacent in the circumferential direction are the first and than the tip of each of 2 Tsumekyoku 123, 143 in that it is arranged at a position entering in the axially inward, different from the reference example 1. That is, the permanent magnet 15b disposed on the tip end side of the first claw pole portion 123 is disposed at a position axially inward of the reference line L1 connecting the tip ends of the first claw pole portions 123 by a predetermined distance There is. Further, the permanent magnet 15a disposed on the tip end side of the second claw pole portion 143 is disposed at a position axially inward of the reference line L2 connecting the tip ends of the second claw pole portions 143 by a predetermined distance There is. In addition, since the other structure is the same as the reference example 1 , detailed description is abbreviate | omitted.

According to the rotor 1 of the third embodiment configured as described above, the same operation and effect as the first embodiment can be obtained. Furthermore, in the case of Reference Example 3 , since it has the above-described configuration, it is possible to arrange the permanent magnets 15a and 15b at the optimum position according to the axial length and strength of the permanent magnets 15a and 15b to be adopted. Become.

[ Embodiment 1 ]
As shown in FIGS. 10, 11, and 12, the rotor 1 according to the first embodiment includes permanent magnets 15c to 15f disposed in the gaps between the first and second claw pole portions 123 and 143 adjacent in the circumferential direction. However, the second embodiment differs from the first embodiment in that only the end surface on the rotation direction side of the rotor 1 among the end surfaces on both sides in the circumferential direction of the first and second claw pole portions 123 and 143 is abutted. That is, the permanent magnets 15c and 15d being in contact with the end surface of the first claw pole portion 123 in the rotational direction are only a predetermined distance from the end surface of the second claw pole portion 143 adjacent to the rotational direction It is separated. The permanent magnets 15e and 15f being in contact with the end face on the rotation direction side of the second claw pole portion 143 are only a predetermined distance from the end face on the counter rotation direction side of the first claw pole portion 123 adjacent to the rotation direction side. It is separated.

The permanent magnets 15c and 15e that are in contact with the tip end sides of the first and second claw pole portions 123 and 143 are permanent magnets 15d that are in contact with the root sides of the first and second claw pole portions 123 and 143. , 15f, it differs from the reference example 1 in that it is formed of a material having a smaller energy product of magnets. In general, examples of the material having a large energy product of magnets include neodymium and ferrite. Moreover, as a material with a small energy product of a magnet, an alnico, a ferrite, etc. are mentioned, for example. From among these, it is sufficient to select a material having a relative strength relation of energy products of magnets. In addition, since the other structure is the same as the reference example 1 , detailed description is abbreviate | omitted.

According to the rotor 1 of Embodiment 1 configured as described above, the same operation and effect as those of Reference Example 1 can be obtained. Furthermore, in the case of Embodiment 1, the permanent magnets 15c to 15f disposed in the gaps between the first and second claw pole portions 123 and 143 adjacent in the circumferential direction are the first and second claw pole portions 123, Of the end surfaces on both sides in the circumferential direction of 143, only the end surface on the rotation direction side of the rotor 1 is abutted. As a result, since the holding strength of the permanent magnets 15c to 15f with respect to the first and second claw pole portions 123 and 143 due to the rotation of the rotor 1 is secured, the first and second claw pole portions 123 adjacent to the rotation direction side , 143, and members such as a magnet protective cover interposed between the end surfaces on the side opposite to the rotational direction can be omitted. As a result, simplification of the structure and cost reduction can be achieved.

In the first embodiment , the permanent magnets 15c and 15e that are in contact with the distal end sides of the first and second claw pole parts 123 and 143 are in contact with the root sides of the first and second claw pole parts 123 and 143. It is formed of a material having a smaller magnetic energy product than the permanent magnets 15d and 15f. In general, the permanent magnet disposed in the gap between the first and second claw pole portions 123 and 143 differs in the degree of contribution to the magnetic circuit depending on the location and the rotational direction, and the price of the permanent magnet is the energy of the magnet It is proportional to the product. Therefore, by adopting the above-described configuration, it is possible to reduce the cost while limiting the decrease in performance in a limited manner.

[ Reference Example 4 ]
In the rotor 1 of the reference example 4 , as shown in FIG. 13, FIG. 14 and FIG. 15, the permanent magnet 15g disposed in the gap between the first and second claw pole portions 123, 143 adjacent in the circumferential direction are arranged in the circumferential direction central portion of the gap, in that the magnetic gap portion 16 between the first and second Tsumekyoku 123, 143 of the circumferential sides are formed, different from the reference example 1. In this case, although not shown, a known member formed of a nonmagnetic material, such as a spacer, a spring member, a magnet protection cover, etc., is disposed in the magnetic gap 16, and the permanent magnet 15g is set. It is intended to be held in position. In addition, since the other structure is the same as the reference example 1 , detailed description is abbreviate | omitted.

According to the rotor 1 of the fourth embodiment configured as described above, the same operation and effect as the first embodiment can be obtained. Furthermore, in the case of Reference Example 4 , since it has the above configuration, even when the rotor 1 is mounted on a motor configured to be rotatable in both forward and reverse directions, the same performance can be obtained in both forward and reverse directions. .

[ Second embodiment ]
In the rotor 1 of the second embodiment , as shown in FIGS. 16, 17 and 18, permanent magnets 15h, 15i disposed in the gaps between the first and second claw pole portions 123, 143 adjacent in the circumferential direction. but in that only been abut on end faces of both sides in the peripheral direction of the distal end of the first and second Tsumekyoku 123, 143, different from the reference example 1. That is, the permanent magnet 15h that is in contact with only the end surfaces on both sides in the circumferential direction of the tip end portion of the first claw pole portion 123 is magnetically connected to the end surface on the root side of the second claw pole portion 143 opposed thereto. An air gap 16 is formed. In addition, the permanent magnet 15i that is in contact with only the end surfaces on both sides in the circumferential direction of the tip end portion of the second claw pole portion 143 is magnetically connected to the end surface on the root side of the second claw pole portion 143 opposed thereto. An air gap 16 is formed. In addition, since the other structure is the same as the reference example 1 , detailed description is abbreviate | omitted.

According to the rotor 1 of Embodiment 2 configured as described above, the same operation and effect as those of Reference Example 1 can be obtained. Furthermore, in the case of Embodiment 2 , since it has the above-mentioned configuration, the first and second claw poles having a low magnetic flux density due to the field on the opposing surface of the first claw pole portion 123 and the second claw pole portion 143 Since the tip portions of the portions 123 and 143 can be assisted from both sides in the circumferential direction by two permanent magnets 15 h and 15 i, they can be superior as a magnetic circuit.

[ Reference Example 5 ]
In the rotor 1 of the reference example 5 , as shown in FIG. 19, the permanent magnet 15 j disposed in the gap between the first and second claw pole portions 123 and 143 adjacent in the circumferential direction is accommodated in the magnet protection cover 17. The second embodiment differs from the first embodiment in that the first and second claw pole portions 123 and 143 are held via the magnet protection cover 17. In this case, the magnet protection cover 17 is formed in a box shape, and accommodates the magnet protection cover 17 inside with the pair of spacers 18 disposed on both sides in the circumferential direction. The magnet protection cover 17 is held in a state in which the end surfaces on both sides in the circumferential direction abut on the opposing surfaces of the first and second claw pole portions 123 and 143 adjacent in the circumferential direction.

  The magnet protection cover 17 and the spacer 18 can be formed of, for example, a nonmagnetic material such as a resin or a nonmagnetic metal. Further, the magnet protection cover 17 and the spacer 18 may be integrally formed, or the spacer 18 may be omitted to form a space.

According to the rotor 1 of the fifth embodiment configured as described above, the same operation and effect as the first embodiment can be obtained. Furthermore, in the case of the reference example 5 , since it has the above-described configuration, it is possible to more reliably prevent breakage or falling off of the permanent magnet 15 j at the time of high speed rotation of the rotor 1.

  DESCRIPTION OF SYMBOLS 1 ... Rotor, 12 ... 1st pole core, 121 ... Boss part, 122 ... Disk part, 123 ... 1st nail pole part, 13 ... Field coil, 14 ... 2nd pole core, 141 ... Boss part, 142 ... Disk part , 143: second claw pole, 15a to 15j, permanent magnet, 16: magnetic gap, 17: magnet protective cover, 18: spacer.

Claims (5)

First the field coil (13) is wound on to the field flux projecting first boss portion that flows in the axial direction (121), radially outward from an axial end in the circumferential direction by a predetermined pitch of the first boss portion A first pole core (12) having a disk portion (122) and a first claw pole portion (123) extending axially from the tip of each of the first disk portions and surrounding the field coil;
A second boss portion (141) in which a field coil (13) is wound and field flux flows in the axial direction, and a second boss portion which protrudes radially outward at a predetermined pitch in the circumferential direction from an axial end of the second boss portion . disc portion (142), have a second Tsumekyoku portion surrounding the field coil extending in the axial direction from the tip end of each of said second disc section (143) and facing said first pole core A second pole core (14) to be arranged ;
The first claw pole portion is interposed between the first claw pole portion and the second claw pole portion alternately arranged in the circumferential direction to make the first claw pole portion into a first polarity and the second claw pole portion a second permanent magnet you magnetization polarity (15a~15j), the rotor equipped with,
The permanent magnet includes a first permanent magnet disposed at one axial end of the gap and a second permanent magnet disposed at the other axial end, and the first and second claw poles Of the end surfaces on both sides in the circumferential direction, the permanent magnets (15c, 15e) which are in contact with only the end surfaces in the rotational direction of the rotor and abut on the tip sides of the first and second claw pole portions are An electric rotating machine characterized in that the material has a smaller energy product of the magnets than the permanent magnets (15d, 15f) abutted on the root side of the first and second claw pole portions Rotor. First the field coil (13) is wound on to the field flux projecting first boss portion that flows in the axial direction (121), radially outward from an axial end in the circumferential direction by a predetermined pitch of the first boss portion A first pole core (12) having a disk portion (122) and a first claw pole portion (123) extending axially from the tip of each of the first disk portions and surrounding the field coil;
A second boss portion (141) in which a field coil (13) is wound and field flux flows in the axial direction, and a second boss portion which protrudes radially outward at a predetermined pitch in the circumferential direction from an axial end of the second boss portion . disc portion (142), have a second Tsumekyoku portion surrounding the field coil extending in the axial direction from the tip end of each of said second disc section (143) and facing said first pole core A second pole core (14) to be arranged ;
The first claw pole portion is interposed between the first claw pole portion and the second claw pole portion alternately arranged in the circumferential direction to make the first claw pole portion into a first polarity and the second claw pole portion a second permanent magnet you magnetization polarity (15a~15j), the rotor equipped with,
The permanent magnet includes a first permanent magnet disposed at one axial end of the gap and a second permanent magnet disposed at the other axial end, and the first and second claw poles A rotor of a rotating electrical machine, wherein the rotor is in contact only with end surfaces on both sides in the circumferential direction of a tip end portion . The rotor of the rotating electrical machine according to claim 1 or 2 , wherein the permanent magnet is disposed at a position projecting outward in the axial direction with respect to the respective tips of the first and second claw pole portions. . The rotor of the rotating electrical machine according to claim 1 or 2 , wherein the permanent magnet is disposed at a position axially inward of the respective tips of the first and second claw pole portions. . The permanent magnet, any one of the preceding claims, characterized in that it is held in the first and second Tsumekyoku section through the magnet protecting cover is accommodated in the magnet protection cover (17) The rotor of the rotating electric machine according to the above item.

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