JP2014082836A - Rotor and rotary electric machine having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor that improves strength, and reduces performance degradation, of a rotor core that is made up of laminated magnetic steel sheets and that increases the efficiency thereof by preventing eddy current and reducing iron loss with a simple configuration, and to provide a rotary electric machine having the same.SOLUTION: A rotor includes: a rotor core 11 that is made up of laminated magnetic steel sheets; permanent magnets 13a and 13b respectively inserted or press-fitted in a plurality of magnet holes 18a and 18b that are provided in the proximity of outer circumferential surfaces 15a and 15b of the rotor core 11 so as to be penetrated in a rotational axis direction x of the rotor core 11 and that are arranged approximately at regular intervals in a rotational circumferential direction of the rotor core 11; and a reinforcing plate 30 that is formed of non-magnetic material and that divides the outer circumferential surfaces 15a and 15b of the rotor core 11, the magnet holes 18a and 18b, and the permanent magnets 13a and 13b in the rotational axis direction x. The permanent magnets 13a and 13b are formed to have such large cross-sectional areas as to compensate for cross-sectional areas, in a rotational circumferential direction of the reinforcing plate 30, of the permanent magnets 13a and 13b as divided by the reinforcing plate 30.

Description

  The present invention relates to a rotor in which a rotor core is composed of laminated electromagnetic steel sheets, an eddy current is prevented with a simple structure, and efficiency is improved by suppressing iron loss, and a rotating electrical machine including the rotor.

  Considering the impact on the environment, EVs (electric vehicles) and HEVs (hybrid electric vehicles) are increasing year by year. In addition, with the reduction in fuel consumption of vehicles, the use of auxiliary machinery such as power steering and cooling pumps is also progressing.

  For this reason, the electric power consumption in vehicles is increasing year by year, and it is essential to increase the output of rotating electrical machines such as an alternator (generator) and a motor (electric motor) for supplying electric power. However, enlarging the device as the output becomes higher deteriorates the mountability on the vehicle, so that it is necessary to increase the output density and to improve the efficiency.

  In response to this, a claw pole type rotor has been proposed (see, for example, Patent Document 1). In this device, an exciting coil is wound around a central shaft, and a permanent magnet is oriented with the magnetic pole face (N pole, S pole) in the circumferential direction between the claw pole and the claw pole so that the N pole and the S pole alternate. In the circumferential direction.

  In this method, it is difficult to obtain the dimensional accuracy between the claw poles, and it is extremely difficult to prevent the permanent magnet from jumping out by the centrifugal force particularly at high speed rotation.

  On the other hand, instead of a claw pole type rotor, there is a rotor that uses a rotor core in which electromagnetic steel sheets are laminated in the axial direction (see, for example, Patent Document 2). Here, a rotor using this laminated electrical steel sheet will be described with reference to FIG.

  As shown in the sectional view of FIG. 12A and the perspective sectional view of FIG. 12B, the rotor 10X is an inner rotor type that rotates inside a stator (not shown), and an air gap between the rotor 10X and the stator ( It is a rotor of a radial gap type brushless rotating electrical machine in which a gap is arranged in the radial direction of rotation.

  The rotor 10X includes a shaft (rotor shaft) S1 and a rotor core 11X. The rotor core 11X includes a laminated electromagnetic steel plate, and includes an exciting coil 12X, a permanent magnet 13X, and a reinforcing pin 14. This rotor 10X has a simpler structure than the above-mentioned claw pole type rotor by configuring the rotor core 11X with laminated electromagnetic steel plates, thereby preventing eddy currents and improving efficiency by suppressing iron loss. Can do.

  However, the strength of the laminated electrical steel sheet is weak, and when a centrifugal force is applied to the rotor core 11X, as shown in FIG. 12A, the central portion of the outer peripheral surface 15X of the rotor core 11X swells and deforms as indicated by a broken line. Then, the greatest force is applied to the weakest part WP indicated by WP in the figure, and the weakest part WP is cut and damaged.

Japanese Patent Laying-Open No. 2005-094978 JP 2009-240013 A

  The present invention has been made in view of the above problems, and its object is to provide a rotor core composed of a laminated electrical steel sheet that has a simple structure, prevents eddy currents, and suppresses iron loss to improve efficiency. The rotor which can improve the intensity | strength of this, and can suppress that a performance falls with reinforcement, and a rotary electric machine provided with the same are provided.

  The rotor of the present invention for solving the above-mentioned object is provided with a plurality of rotor cores formed of laminated electromagnetic steel sheets, and in the vicinity of an opposing surface facing the stator of the rotor core so as to penetrate in the rotation axis direction, A rotor including a magnet hole arranged in a circumferential direction of rotation and a permanent magnet accommodated in the magnet hole, formed of a nonmagnetic material, wherein the opposed surface, the magnet hole, and the permanent magnet are rotated. The permanent magnet divided by the reinforcing plate has a sectional area in the rotational circumferential direction of the divided permanent magnet so as to compensate for a cross-sectional integral in the rotational circumferential direction of the reinforcing plate. Formed and configured.

  According to this structure, the deformation | transformation by the centrifugal force concerning the rotor core comprised with the laminated electromagnetic steel plate, or the damage by the deformation | transformation can be reinforced with a reinforcement board. In particular, if a reinforcing plate is provided at the central portion of the rotor core in the rotational axis direction where the centrifugal force has a large effect, the reinforcing plate presses the bulge of the central portion, so that deformation of the rotor core can be suppressed, and the rotor core has the strongest strength. Breakage of weak corners can be prevented.

  Moreover, the magnetic force of the permanent magnet which became short by providing a reinforcement board can be supplemented by making one end of a permanent magnet larger than the hole for magnets, and the fall of a performance can be suppressed. The shape and size of one end of the permanent magnet can be arbitrarily determined.

  As a result, when a rotor core made of the above-mentioned reinforced laminated electromagnetic steel sheet is used for a rotating electrical machine such as an electric motor or a generator, an eddy current can be prevented and iron loss can be suppressed with a simple structure. Can be improved.

  In addition, the laminated electrical steel sheet is a steel sheet with high conversion efficiency of electric energy and magnetic energy, and after treating the insulating film on the surface of each steel sheet with low iron loss, so as not to flow electricity, For example, a silicon steel sheet that can be manufactured by adding silicon to iron. The non-magnetic material is a metal material that is not magnetized and is not affected by a magnetic field, such as reinforced aluminum or austenitic stainless steel.

  Further, in the rotor described above, each of the divided permanent magnets is formed in an L shape so that one end of each of the divided permanent magnets is longer in the rotational radius direction than the other end. It is preferable to form.

  In addition, in the above-described rotor, a radius of the inner peripheral surface of the annular reinforcing plate formed in an annular shape is formed to be equal to or larger than a radius of the outer peripheral surface of the rotor shaft of the rotor core. When sandwiched between the rotor cores divided into two, the width of the annular reinforcing plate can be increased, and the strength against centrifugal force can be increased.

  For example, by reducing the inner diameter of the inner peripheral surface of the reinforcing plate and extending the reinforcing plate to the outer peripheral surface of the rotor shaft, or extending it to the vicinity of the outer peripheral surface where the permanent magnet is inserted and the outer peripheral surface of the rotor shaft A thing can be pinched by the rotor core divided | segmented into the axial direction, and the center part of the rotating shaft direction of a rotor core can be reinforced.

  Further, in the above rotor, a plurality of reinforcing pins are provided near the outer peripheral surface of the rotor core so as to penetrate in the rotation axis direction, and are arranged at substantially equal intervals in the rotation circumferential direction and between the magnet holes. And a reinforcing pin to be inserted into the reinforcing pin hole, and if the reinforcing plate formed in an annular shape has an insertion hole through which the reinforcing pin is inserted, It is possible to prevent the magnetic steel sheets laminated in the direction of the rotation axis from being peeled off and to prevent magnetism from passing therethrough.

  This reinforcing pin is preferably made of a non-magnetic material, but when it is made of an iron material such as S20C, it is better to make it as thin as possible in consideration of the generation of eddy currents. Note that if the total value of the cross-sectional areas of all the reinforcing pins provided in the rotor core is greater than or equal to the cross-sectional area of the rotor shaft, magnetic leakage can be further prevented.

  Moreover, the rotating electrical machine of the present invention for solving the above object is configured to include any of the rotors described above. According to this configuration, by using the rotor core made of the laminated electromagnetic steel sheet having improved strength, the output density can be increased and the efficiency can be improved without deteriorating the mounting property on the vehicle.

  The rotating electric machine such as an electric motor or a generator can be applied to either an inner rotor type or an outer rotor type, and in addition, can be applied to either a radial gap method or an axial gap method.

  Furthermore, in the above rotating electric machine, the rotating electric machine described above is preferably formed of a brushless rotating electric machine that is an inner rotor type and a radial gap type.

  According to the present invention, the strength of a rotor core composed of laminated electrical steel sheets that can improve efficiency by preventing eddy current and suppressing iron loss with a simple structure and simple structure is improved. At the same time, it is possible to suppress the performance from being lowered due to the reinforcement. As a result, the output density can be increased and the efficiency can be increased without deteriorating the mountability of the rotating electrical machine on the vehicle.

It is the top view which showed the rotary electric machine provided with the rotor of 1st Embodiment which concerns on this invention. It is sectional drawing which shows the II-II cross section of FIG. It is a top view which shows the reinforcement board of FIG. It is the enlarged view to which the permanent magnet of FIG. 2 was expanded. It is sectional drawing which showed the rotary electric machine provided with the rotor of 2nd Embodiment which concerns on this invention. It is sectional drawing which showed the rotary electric machine provided with the rotor of 3rd Embodiment which concerns on this invention. The reinforcing plate of FIG. 6 is shown, (a) and (b) are plan views of reinforcing plates having different patterns. It is sectional drawing which showed the rotary electric machine provided with the rotor of 4th Embodiment which concerns on this invention. The reinforcement pin and reinforcement board of FIG. 8 are shown, (a) is a perspective view of a reinforcement pin, (b) is a top view of a reinforcement board. It is sectional drawing which showed the rotary electric machine provided with the rotor of 5th Embodiment which concerns on this invention. FIG. 10 shows the reinforcing pin and the reinforcing plate of FIG. 10, (a) is a perspective view of the reinforcing pin, and (b) is a plan view of the reinforcing plate. The rotor of the rotary motor of a prior art is shown, (a) is sectional drawing of a rotor, (b) is a perspective sectional view of a rotor.

  Hereinafter, a rotor according to an embodiment of the present invention and a rotating electrical machine including the rotor will be described with reference to the drawings. Note that the dimensions of the drawings are changed so that the configuration can be easily understood, and the ratios of the thicknesses, widths, lengths, and the like of the respective members and parts do not necessarily match the ratios of actually manufactured parts.

  First, a rotating electrical machine including the rotor according to the first embodiment of the present invention will be described with reference to FIGS. Here, as shown in FIG. 2, the rotation axis direction of the rotating electrical machine is x, and the rotation radius direction is y.

  The rotor (rotor) 10 of the motor (rotating electrical machine) 1 shown in FIGS. 1 to 3 has an outer peripheral surface 15X facing the stator 20 of the conventional rotor 10X shown in FIG. By newly providing a reinforcing plate 30 shown in FIG. 3 as shown in FIG. 2 so as to divide, preferably in addition to the outer peripheral surface 15X, the magnet hole 18X and the permanent magnet 13X are also divided in the rotation axis direction x. The strength of the rotor core (rotor core) 11 can be improved.

  Further, by providing the reinforcing plate 30, as shown in FIG. 2, the permanent magnets 13a and 13b of the permanent magnets 13a and 13b divided by the reinforcing plate 30 are supplemented so as to supplement the cross-sectional integral in the rotational circumferential direction of the reinforcing plate 30. By reducing the cross-sectional area of the rotation circumferential direction of 13b, it is possible to suppress the performance degradation.

  Specifically, as shown in FIG. 2, an annular reinforcing plate 30 formed of a non-magnetic material shown in FIG. 3 is arranged between the outer peripheral surfaces 15a and 15b in the center of the rotor core 11, and preferably with the outer peripheral surface 15a. In addition to 15b, the magnet holes 18a and 18b and the permanent magnets 13a and 13b are disposed and joined. In addition, one end of the permanent magnets 13a and 13b is formed larger than the magnet holes 18a and 18b.

  According to this structure, the deformation | transformation of the outer peripheral surfaces 15a and 15b of the rotor core 11 comprised with the laminated electromagnetic steel plate by the centrifugal force generated when the rotor 10 rotates can be suppressed. Thereby, the intensity | strength of the rotor core 11 comprised with the laminated electromagnetic steel plate can be improved.

  Furthermore, the magnetic force of the permanent magnets 13a and 13b that are divided and shortened by the reinforcing plate 30 can be compensated for, and the performance degradation can be suppressed.

  Further, as shown in FIG. 3, the reinforcing plate 30 includes an insertion hole 31 through which the reinforcing pin 14 that suppresses the peeling of the laminated electromagnetic steel sheet and prevents magnetic leakage is inserted. Thereby, the intensity | strength of the rotor core 11 can be improved, leaving the effect of the reinforcement pin 14 as it is.

  The rotor 10 and the motor 1 including the rotor 10 will be described in more detail. As shown in FIGS. 1 and 2, the motor 1 includes a rotor 10 fixed to a shaft (rotating shaft) S <b> 1 and a stator (stator) 20. The rotor 10 includes a rotor core 11, an excitation coil 12, permanent magnets 13 a and 13 b, and a reinforcing pin 14, and the stator 20 includes a stator core (stator core) 21, a tooth portion 22, and a coil 23.

In this motor 1, an exciting coil 12 is wound around a shaft S1, and permanent magnets 13a and 13b are inserted into a cylindrical rotor core 11 on the outer side thereof so that the same poles face each other in the rotational radius direction and the magnetic pole surface in the rotational circumferential direction. The inner exciting coil 12 and the outer permanent magnets 13a and 13b are magnetically connected to each other, and the current of the exciting coil 12 is changed to change the amount of magnetic flux entering the stator 20 from the rotor 10 to improve the efficiency. Can be improved.

  The rotor core 11 is composed of electromagnetic steel plates (hereinafter referred to as laminated electromagnetic steel plates) laminated in the rotation axis direction x, and a plurality of cylindrical portions 16 and arms (supporting portions) arranged radially from the center at both ends of the cylindrical portions 16. 17. In the cylindrical portion 16, magnet holes 18 a and 18 b and reinforcing pin holes 19 are alternately arranged so as to penetrate in the rotation axis direction x and at substantially equal intervals in the circumferential direction of rotation.

  At this time, the number of arms 17 provided at one end is not particularly limited. However, if the total value of the cross-sectional areas of all the arms 17 provided at one end is equal to or greater than the cross-sectional area of the shaft S1. When the rotor 10 is rotated, magnetism leaking from the rotor 10 can be reduced.

  Here, it supplements about a laminated electromagnetic steel plate. An electromagnetic steel plate is a steel plate having high conversion efficiency between electric energy and magnetic energy, and can reduce iron loss (energy consumed by iron when magnetized). A laminated electromagnetic steel sheet is obtained by processing an insulating film on each surface of each electromagnetic steel sheet, processing it so as not to pass electricity, and laminating it in the rotation axis direction x of the rotor 10.

  By configuring the rotor core 11 with the laminated electromagnetic steel sheet, eddy current can be prevented and efficiency can be improved by suppressing iron loss. As this laminated electromagnetic steel sheet, for example, a silicon steel sheet that can be manufactured by adding silicon to iron is used. In this embodiment, electromagnetic steel plates are laminated in the rotation axis direction x to prevent separation due to centrifugal force.

  The reinforcing pin 14 is a reinforcing member of the rotor core 11 inserted or press-fitted into the reinforcing pin hole 19 of the rotor core 11 and the insertion hole 31 of the reinforcing plate 30, and prevents peeling of the electromagnetic steel plates stacked in the rotation axis direction x. Can do. Moreover, when the rotor 10 rotates, the magnetism which leaks from the rotor 10 can also be reduced. In particular, if the total value of the cross-sectional areas of all the reinforcing pins 14 in the vicinity of the insertion hole 31 of the reinforcing plate 30 is greater than or equal to the cross-sectional area of the shaft S1, magnetic leakage in the rotational radius direction y can be effectively prevented. it can.

  As shown in FIG. 3, the reinforcing plate 30 is formed of an annular nonmagnetic material. The term “nonmagnetic material” as used herein refers to a metal material that is not magnetized and thus is not affected by a magnetic field, such as reinforced aluminum or austenitic stainless steel. The reinforcing plate 30 is intended to improve the strength of the rotor core 11, and therefore, the nonmagnetic material used by the reinforcing plate 30 is preferably excellent in strength and toughness.

  2 and 3, the radius of the inner peripheral surface of the reinforcing plate 30 is R1, the radius of the outer peripheral surface of the reinforcing plate 30 is R2, the width of the annular ring of the reinforcing plate 30 is H1, and the diameter of the insertion hole 31. Is D1. The radius of the shaft S1 is R3, and the diameter of the reinforcing pin 14 is D2.

  2 and 3, the radius R2 of the outer peripheral surface of the reinforcing plate 30 is set to the outer peripheral surface 15a of the rotor core 11 so that the reinforcing plate 30 divides at least the outer peripheral surfaces 15a and 15b of the rotor core 11 in the rotation axis direction x. And a radius of 15b or more. In addition to the outer peripheral surfaces 15a and 15b of the rotor core 11, the reinforcing plate 30 has a ring width that divides the magnet holes 18a and 18b and the permanent magnets 13a and 13b in the rotation axis direction x. Set H1.

  Since the strength against centrifugal force can be improved if the annular width H1 of the reinforcing plate 30 is wide, the radius R1 of the inner peripheral surface of the reinforcing plate 30 is set to be equal to or larger than the radius R3 of the shaft S1. In addition, the diameter D1 of the insertion hole 31 is a size that allows the reinforcement pin 14 to be inserted, and is not less than the diameter D2 of the reinforcement pin 14. Increasing the diameter D1 of the insertion hole 31 can improve the flow of magnetic flux in the direction of the rotational axis x of the portion that has been suppressed by the nonmagnetic material, so that the magnetic flux generated from the exciting coil 12 can be easily passed. Can do.

  In order to improve the strength of the rotor core 11 composed of laminated electromagnetic steel plates, the permanent magnets 13a and 13b are divided in the rotation axis direction x by providing the reinforcing plate 30 at the center of the rotor core 11. Considering the mountability of the motor 1 on the vehicle, if the reinforcing plate 30 is provided without changing the overall length in the rotational axis direction x of the rotor of the prior art, the permanent magnet 13a and the permanent magnet 13a are equivalent to the thickness of the reinforcing plate 30 It is necessary to make the total value of the length of the rotation axis direction x of 13b shorter than the total length of the rotor core 11 in the rotation axis direction x. Therefore, the sectional area of the permanent magnets 13a and 13b in the rotational circumferential direction is reduced by the sectional integral of the reinforcing plate 30 in the rotational circumferential direction.

  Thereby, the magnetic flux of the permanent magnets 13a and 13b may be weakened. Therefore, in the first embodiment, FIG. 2 shows that the length of the permanent magnets 13a and 13b in the rotational axis direction x is shortened, that is, to supplement the cross-sectional integral of the reinforcing plate 30 in the rotational circumferential direction. As described above, one end of each of the permanent magnets 13a and 13b is lengthened in the rotational radius direction y, and the sectional area of the permanent magnets 13a and 13b in the rotational circumferential direction is increased. Preferably, as shown in FIG. 4, the permanent magnets 13a and 13b are formed in an L shape.

  The permanent magnet 13a is divided in the rotation axis direction x by the reinforcing plate 30, and the length H2 of the rotation radius direction y of the end portion E2 opposite to the divided end portion E1 is set to the rotation radius direction of the end portion E1. It is longer than the length H1 of y and is formed in an L shape. The permanent magnet 13b is formed in the same manner.

  And the cylindrical part 16 is formed according to the shape of the permanent magnets 13a and 13b so that the permanent magnets 13a and 13b formed in this L shape can be inserted or press-fitted. Specifically, a part of the inner peripheral surface 16a on the end side of the cylindrical portion 16 is recessed according to the permanent magnets 13a and 13b. The magnet holes 18a and 18b are also formed in a shape matching the permanent magnets 13a and 13b.

  According to this configuration, the reinforcing plate 30 improves the strength of the rotor core 11 composed of laminated electromagnetic steel sheets that can improve efficiency by preventing eddy currents and suppressing iron loss with a simple structure. At the same time, the portion shortened in the rotational axis direction x is lengthened in the rotational radial direction y, that is, the permanent cross-sectional area in the rotational circumferential direction of the reinforcing plate 30 is increased so as to compensate for the sectional integral in the rotational circumferential direction. By providing the magnets 13a and 13b, it can suppress that performance falls with reinforcement.

  Even if the reinforcing plate 30 is provided, it is not necessary to lengthen the entire length of the rotor core 11 in the rotation axis direction x, so that the strength and performance can be improved without deteriorating the mountability of the motor 1 on the vehicle. . In particular, as in this embodiment, the permanent magnets 13a and 13b are formed in an L shape so that interference with the exciting coil 12 in the rotor core 11 is avoided and the magnetic fluxes of the permanent magnets 13a and 13b are reduced. Can be suppressed.

  In the present invention, one end of the permanent magnet may be formed in an arbitrary shape, but considering the influence on the exciting coil 12, the length of the portion corresponding to the end of the rotor core 11 is extended in the rotational radius direction y. An L-shape that can be used is preferred.

As shown in FIGS. 1 to 4, the motor 1 is an inner rotor type in which a stator 20 is disposed outside the rotor 10, and an air gap (gap) AG <b> 1 between the rotor 10 and the stator 20 is provided with a rotation radius. The radial gap type brushless DC motor is arranged in the direction (radial direction) x, the coil 23 is arranged on the stator 20, the permanent magnets 13a and 13b are arranged on the rotor 10, and the current of the coil 23 is supplied to the permanent magnets 13a and 13b. The rotation is switched by a controller (control device) (not shown) according to the rotation angle.

  In addition, by applying a reverse current to the exciting coil 12, the amount of magnetic flux coming out of the rotor 10 can be reduced. In addition, performance can be improved by the inner exciting coil 12 and the outer permanent magnets 13a and 13b, and the efficiency of the motor 1 can be improved by changing the current of the exciting coil 12 (including reverse current). Can do. When used as a generator, the power generation amount can be increased at a low speed and the power generation amount can be decreased at a medium to high speed.

  According to the above configuration, the rotor core 11 formed of the laminated electromagnetic steel plate of the rotor 10 that can prevent the eddy current and improve the efficiency by suppressing the iron loss with a simple structure is reinforced by the reinforcing plate 30. The strength of the rotor core 11 can be improved. In particular, as in this embodiment, when the reinforcing plate 30 is arranged at a substantially central portion in the rotation axis direction x of the rotor core 11, the outer peripheral surfaces 15a and 15b of the rotor core 11 are deformed by the centrifugal force generated by the rotation of the rotor core 11. It can be pressed down and the strength can be further improved.

  In addition, it can suppress that the performance of permanent magnet 13a and 13b falls with reinforcement by devising the shape of permanent magnet 13a and 13b. Thereby, the magnetic force of the permanent magnets 13a and 13b which are reduced by the amount of the reinforcing plate 30 can be compensated.

  Next, a rotating electrical machine including the rotor according to the second embodiment of the present invention will be described with reference to FIG. The rotor 40 of the motor 2 includes reinforcing plates 41a, 41b, and 41c having the same configuration as the reinforcing plate 30 of the rotor 10 of the first embodiment shown in FIG. In this configuration, not only the central portion but also both end portions of the rotor core 11 are provided.

  According to this configuration, by providing the reinforcing plates 41b and 41c on both sides of the rotor core 11, the overall length of the rotor core 11 becomes longer, but the strength can be further improved.

  Next, a rotary electric machine including the rotor according to the third embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol shall be used for the same structure, radius, etc. as 1st Embodiment.

  The rotor 50 of the motor 3 includes a reinforcing plate 60 shown in FIG. 7A instead of the reinforcing plate 30 of the rotor 10 of the first embodiment shown in FIG. As shown in FIG. 6, the first rotor core 51a and the second rotor core 51b divided in the rotation axis direction x are sandwiched.

  The first rotor core 51a includes a cylindrical portion 56a and an arm 57a, and includes an exciting coil 52a, a permanent magnet 53a, a reinforcing pin 54, an outer peripheral surface 55a, a magnet hole 58a, and a reinforcing pin hole 59a. Since the second rotor core 51b has substantially the same configuration, the description thereof is omitted.

  Here, assuming that the radius of the inner peripheral surface of the reinforcing plate 60 is R4, the reinforcing plate 60 is reinforced by making the radius R4 of the inner peripheral surface of the reinforcing plate 60 the same as the radius R3 of the outer peripheral surface of the shaft S1. The width H2 of the plate 60 can be made wider than the width H1 of the first embodiment, and the strength against the centrifugal force at the center portion in the rotation axis direction x of the rotor 50 can be increased.

  Further, the first rotor core 51a and the second rotor core 51b are divided in the rotation axis direction x. The first rotor core 51a, the reinforcing plate 60, and the second rotor core 51b are joined by a well-known technique, and the first rotor core. The joint can be reinforced by the reinforcing pins 54 penetrating the 51a, the reinforcing plate 60, and the second rotor core 51b.

  As shown in FIG. 7A, the reinforcing plate 60 is obtained by reducing the radius R4 of the inner peripheral surface of the reinforcing plate 60 and extending the inner peripheral surface to the outer peripheral surface of the shaft S1. Therefore, the reinforcing plate 60 is heavier than the reinforcing plate 30 of the first embodiment because the annular width H3 of the reinforcing plate 60 is widened. Therefore, as shown in FIG. If 62 is provided, the reinforcement board 60 can be reduced in weight and it can maintain without reducing efficiency.

  In addition, as in the second embodiment, the reinforcing plates 60 can be provided before and after the rotor 50 to further improve the strength.

  Next, a rotary electric machine including the rotor according to the fourth embodiment of the present invention will be described with reference to FIGS. 8 and 9. The rotor 70 of the motor 4 includes a reinforcing pin 71 shown in FIG. 9A instead of the reinforcing pin 54 of the third embodiment shown in FIG. 6, as shown in FIG. In place of the reinforcing plate 60 of the third embodiment shown in FIG. 9, a reinforcing plate 74 having an insertion hole 75 having a larger diameter shown in FIG. 9B is provided as shown in FIG.

  As shown in FIG. 9A, the reinforcing pin 71 includes a pin portion 72 having a diameter D2 and a magnetic flux circulation portion 73 having a diameter D3. Further, as shown in FIG. 9B, the reinforcing plate 74 has a diameter D4 of the insertion hole 75 larger than a diameter D1 of the insertion hole 61 shown in FIG. It is formed substantially the same as the diameter D3 of 73.

  As described above, it is generated when the rotor 70 is rotated by setting the total value of the cross-sectional areas of all the reinforcing pins 71 in the vicinity of the insertion hole 75 of the reinforcing plate 74 to be equal to or larger than the cross-sectional area of the shaft S1. Magnetic leakage in the rotational radial direction y can be prevented. However, if the diameter D4 of the insertion hole 75 is made larger than the diameter of the reinforcing pin of the first or second embodiment and the total length of the pin diameter of the reinforcing pin 71 is increased, an eddy current may be generated. For this reason, it is preferable that the pin diameter is small except in the vicinity of the insertion hole 75 of the reinforcing plate 74.

  Therefore, as shown in FIG. 8, the diameter D4 of the insertion hole 75 through which the reinforcing pin 71 provided in the reinforcing plate 74 is inserted is made larger than the diameter D2, and the reinforcing pin 71 is provided with a magnetic flux flow portion 73 having a diameter D3. Thus, it is possible to improve the flow of magnetic flux on both sides (left and right flow in the rotation axis direction x) without generating eddy current, and this magnetic flow allows the magnetic flux generated from the exciting coils 52a and 52b to pass through. Can be made easier.

  Next, a rotary electric machine including the rotor according to the fifth embodiment of the present invention will be described with reference to FIGS. 10 and 11. The rotor 80 of the motor 5 is replaced with the reinforcing pin 54 of the third embodiment shown in FIG. 6 and is smaller than the diameter D2 of the reinforcing pin 54 and has a diameter D5 of the reinforcing pin 81 shown in FIG. In addition, instead of the reinforcing plate 60 of the third embodiment shown in FIG. 5, the inner peripheral surface has a radius R5 larger than the inner peripheral surface radius R3 shown in FIG. A reinforcing plate 83 having a width H4 narrower than the annular width H3 and wider than the annular width H1 of the reinforcing plate 30 is provided. In addition, instead of the reinforcing pin holes 59a and 59b of the third embodiment of FIG. 6, reinforcing pin holes 82a and 82b having a diameter larger than the diameter D1 of the reinforcing pin holes 59a and 59b are provided.

As shown in FIG. 11B, the reinforcing plate 83 includes an insertion hole 84 having a diameter D6 larger than the diameter D1 of the insertion hole of the first embodiment, and the inner peripheral surface of the reinforcing plate 83 is a shaft. The outer peripheral surface of S1 and the inner sides of the permanent magnets 53a and 53b are disposed approximately in the middle. An annular width H4 of the reinforcing plate 83 is wider than the width H1 of the first embodiment and narrower than the width H3 of the third embodiment.

  According to this configuration, by increasing the diameters of the reinforcing pin holes 82a and 82b, magnetic leakage when the rotor 80 rotates is reduced, and a plurality of thin reinforcing pins 81 are inserted or press-fitted. Generation of current can be suppressed.

  Further, since the width H4 of the reinforcing plate 83 is wider than the width H1 of the first embodiment and narrower than the width H3 of the third embodiment, the strength of the rotor 80 is improved and the weight is reduced. Can also be planned.

  The combinations of the rotors 10, 40, 50, 70, and 80 and the reinforcing plates 30, 41a to 41c, 60, 74, and 83 according to the first to sixth embodiments are not limited to the above. For example, instead of the reinforcing pin 14 of the first embodiment, a plurality of reinforcing pins 81 having a diameter D3 of the fifth embodiment can be provided.

  The above motors 1 to 5 use the rotors 10, 40, 50, 70, and 80 made of laminated electromagnetic steel sheets with improved strength, thereby preventing eddy currents and reducing iron loss with a simple structure. Since it can be suppressed, the output density can be increased and the efficiency can be increased without deteriorating the mountability to the vehicle.

  In the above embodiment, an inner rotor type and radial gap type brushless DC motor has been described as an example. However, for example, the present invention may be an outer rotor type motor (electric motor), an alternator (generator), The present invention can also be applied to an axial gap type motor or an alternator. The stator core 21 may also be composed of laminated electromagnetic steel sheets.

  The rotor of the present invention has a simple structure, prevents the eddy current, and improves the efficiency of the rotor core composed of laminated electromagnetic steel sheets that can improve the efficiency by suppressing the iron loss. Therefore, it can be used for a rotating electric machine such as an electric motor or a generator mounted on a vehicle.

1-6 Motor (Rotating electric machine)
10, 40, 50, 70, 80 Rotor 11, 51a, 51b Rotor core 12, 52a, 52b Excitation coil 13a, 13b, 53a, 53b Permanent magnet 14, 54, 71, 81 Reinforcement pins 15a, 15b, 55a, 55b Outer peripheral surface 16, 56a, 56b Cylindrical portions 17, 57a, 57b Arms 18a, 18b, 58a, 58b Magnet holes 19, 59a, 59b Reinforcing pin holes 20 Stator 30, 41a-41c, 60, 74, 83 Reinforcing plates 31, 61 , 75, 84 Insertion hole

Claims (6)

A rotor core composed of laminated electromagnetic steel sheets, a plurality of magnet holes provided in the vicinity of a facing surface facing the stator of the rotor core so as to penetrate in the rotation axis direction, and a magnet hole disposed in the rotation circumferential direction, and the magnet In a rotor comprising a permanent magnet that is housed in a hole,
A reinforcing plate that is formed of a non-magnetic material and divides the facing surface, the magnet hole, and the permanent magnet in the rotation axis direction,
The rotor, wherein the permanent magnet divided by the reinforcing plate has a large cross-sectional area in the rotational circumferential direction of the divided permanent magnet so as to supplement the cross-sectional integral in the rotational circumferential direction of the reinforcing plate.   Each of the divided permanent magnets is formed in an L shape so that one end of each of the divided permanent magnets is longer in the rotational radius direction than the other end. The rotor according to claim 1. The radius of the inner peripheral surface of the reinforcing plate formed in an annular shape is formed to be equal to or greater than the radius of the outer peripheral surface of the rotor shaft of the rotor core,
The rotor according to claim 1, wherein the reinforcing plate is sandwiched between the rotor cores divided in the direction of the rotation axis. A plurality of reinforcing pin holes provided in the vicinity of the outer peripheral surface of the rotor core so as to penetrate in the rotation axis direction, and disposed at substantially equal intervals in the rotation circumferential direction and between the magnet holes, and the reinforcement pin Reinforcing pins inserted into the holes,
The rotor according to claim 1, further comprising an insertion hole through which the reinforcing pin is inserted in the reinforcing plate formed in an annular shape.   A rotating electrical machine comprising the rotor according to any one of claims 1 to 4.   The rotating electrical machine according to claim 5, wherein the rotating electrical machine is a brushless rotating electrical machine of an inner rotor type and a radial gap type.

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