JP2014082832A - Rotor and rotary electric machine having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor having a rotor core, with improved strength, 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; 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; permanent magnets 13a and 13b that are inserted or press-fitted in the respective magnet holes 18a and 18b; and a reinforcing plate 30 that is formed of non-magnetic material and that divides at least the outer circumferential surfaces 15a and 15b of the rotor core 11 in the rotational axis direction x.

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-described problems, and an object of the present invention is to provide a rotor core composed of laminated electrical steel sheets that has a simple structure, prevents eddy currents, and improves efficiency by suppressing iron loss. It is to provide a rotor capable of improving strength and a rotating electrical machine including the rotor.

  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, In a rotor including a magnet hole arranged in the rotation circumferential direction and a permanent magnet inserted or press-fitted into the magnet hole, a reinforcing plate formed of a nonmagnetic material and dividing the facing surface in the rotation axis direction It is prepared for.

  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.

  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, eddy current is prevented with a simple structure, and efficiency is improved by suppressing iron loss. can do.

  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.

  In the above rotor, when the opposing surface is an outer peripheral surface of the rotor core and the reinforcing plate formed in an annular shape divides the opposing surface, the magnet hole, and the permanent magnet in the rotation axis direction, an inner rotor is obtained. The strength of the rotor of the rotary electric machine can be improved.

  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 in the vicinity of the facing surface 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. In addition to the above-described effects, if the reinforcing pin is provided with a hole and a reinforcing pin inserted into the reinforcing pin hole, and the reinforcing plate is formed in an annular shape, the rotating pin rotates. It is possible to prevent the magnetic steel sheets laminated in the axial direction 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, in the above rotor, the inner diameter of the insertion hole is larger than the outer diameter of the reinforcing pin hole, and the outer diameter of the reinforcing pin in the vicinity of the insertion hole is substantially equal to the inner diameter of the insertion hole. The reinforcing pin can be made thin over the entire length to suppress the generation of eddy currents, and the magnetic flux can easily flow through the reinforcing pin in the axial direction. Thereby, the magnetic flux generated from the exciting coil can be easily passed.

  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.

  ADVANTAGE OF THE INVENTION According to this invention, the intensity | strength of the rotor core comprised with the laminated magnetic steel plate which prevents an eddy current and improves efficiency by suppression of iron loss can be improved with a simple structure. 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 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. 5A and 5B are plan views of reinforcing plates having different patterns, respectively. FIG. 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. 7 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. 9 shows the reinforcing pin and the reinforcing plate of FIG. 9, (a) is a perspective view of the reinforcing pin, and (b) is a plan view of the reinforcing plate. It is sectional drawing which showed the brushless rotary electric machine of 6th Embodiment which concerns on this invention. 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.

  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.

  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.

  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.

  As shown in FIGS. 1 to 3, 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.

  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 that of 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. 5 and 6. 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. 6A in place of the reinforcing plate 30 of the rotor 10 of the first embodiment shown in FIG. As shown in FIG. 5, 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. 6A, 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 becomes heavier than the reinforcing plate 30 of the first embodiment by the amount that the annular width H2 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.

  As in the second embodiment, the reinforcing plates 60 can be provided before and after the rotor cores 51a and 51b 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. The rotor 70 of the motor 4 includes a reinforcing pin 71 shown in FIG. 8A in place of the reinforcing pin 54 of the third embodiment shown in FIG. 5 as shown in FIG. In place of the reinforcing plate 60 of the third embodiment shown in FIG. 7, a reinforcing plate 74 having an insertion hole 75 having a larger diameter shown in FIG. 8B is provided as shown in FIG.

  As shown in FIG. 8A, 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. 8B, 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. 7, 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 flowing 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. 9 and 10. The rotor 80 of this motor 5 is replaced with the reinforcing pin 54 of the third embodiment shown in FIG. 5 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, in place of the reinforcing plate 60 of the third embodiment shown in FIG. 5, the radius R5 of the inner circumferential surface larger than the radius R3 of the inner circumferential surface shown in FIG. A reinforcing plate 83 having a width H3 that is narrower than the annular width H2 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 in FIG. 5, the reinforcing pin holes 82a having a diameter D7 shown in FIG. 9 larger than the diameters of the reinforcing pin holes 59a and 59b, and 82b.

  As shown in FIG. 10B, 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 H3 of the reinforcing plate 83 is wider than the width H1 of the first embodiment and narrower than the width H2 of the third embodiment.

According to this configuration, by increasing the diameter D7 of the reinforcing pin holes 82a and 82b, magnetic leakage when the rotor 80 rotates is reduced, and by inserting or press-fitting a plurality of thin reinforcing pins 81, Generation of eddy current can be suppressed.

  Further, the width H3 of the reinforcing plate 83 is wider than the width H1 of the first embodiment and narrower than the width H2 of the third embodiment, thereby improving the strength of the rotor 80 and reducing the weight. 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 of the first to fifth 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.

  Next, a brushless rotating electrical machine according to a sixth embodiment of the present invention will be described with reference to FIG. The motor 100 includes a rotor 101, a stator 20, yokes 102a and 102b, a front cover 103, a rear cover 104, a case 105, a rear bearing 106, a pilot bearing 107, a bolt 108, a main bearing 109, a fixed shaft S2, and a gear G (pulley). A brushless motor having a double-sided structure.

  In the motor 100, the stator 20 is disposed outside the rotor 101, and the yokes 102a and 102b are disposed inside the rotor 101. The yokes 102a and 102b here are soft iron plates for amplifying the attractive force of the magnet. When the magnetic lines penetrate into the magnetic material, it has the property of concentrating at both ends of the magnetic material. By using this property, the N pole and S pole of the magnet are combined to increase the attractive force or attractive force. Can be made.

  The yoke 102a is press-fitted into the inner peripheral surface 116a opposite to the outer peripheral surface 115a facing the stator 20 from the rear in the rotational axis direction x of the rotor core 111a, and the yoke 102b is inserted into the rotational axis direction x of the rotor core 111b. Is press-fitted into the inner peripheral surface 116b opposite to the outer peripheral surface 115b facing the stator 20 from the front side.

  An air gap AG2 is formed between the yoke 102a and the fixed shaft S2 and between the yoke 102b and the fixed shaft S2. Furthermore, the yoke 102a is supported by the rear bearing 106 and the yoke 102b is supported by the pilot bearing 107 so that the rotor 110 and the rotating body 110 including the yokes 102a and 102b can rotate without contact with the fixed shaft S2. In addition, the exciting coils 112a and 112b are fixed to the fixed shaft S2. At this time, the exciting coils 112a and 112b and the rotating body 110 are not in contact with each other.

In the motor 100, the exciting coils 112a and 112b are fixed to the fixed shaft S2, and the yokes 102a and 102b are connected to both ends of the rotor core 111 (exciting coils 112a and 1).
12b, respectively, so that the inner excitation coils 112a and 112b, the outer permanent magnets 113a and 113b, and the yokes 102a and 102b are magnetically connected to each other, thereby exciting the excitation coils. By changing the currents 112a and 112b, the amount of magnetic flux entering the stator 102 from the rotor 101 can be changed to improve the efficiency.

  The magnetic fluxes of the exciting coils 112a and 112b are composed of the fixed shaft S2, the air gap AG2, the yokes 102a and 102b, the rotor cores 111a and 111b composed of laminated electromagnetic steel sheets, the air gap AG1, the stator 20, the air gap AG1, and the laminated electromagnetic steel sheets. The rotor cores 111a and 111b, the yokes 102a and 102b, and the permanent magnets 113a and 113b flow in this order.

  Since there is an air gap AG2 between the yokes 102a and 102b and the fixed shaft S2, the amount of magnetic flux emitted from the rotor 101 is small when no electricity is passed through the exciting coils 112a and 112b. At this time, by applying a reverse current to the exciting coils 112a and 112b, the magnetic fluxes of the permanent magnets 113a and 113b can be caused to flow to both ends of the fixed shaft S2, so that the magnetic flux flowing out from the rotor 101 is reduced. The flow of magnetic flux can be controlled. Thereby, the efficiency of the motor 100 can be further improved.

  Further, the fixing shaft S2 of the motor 100 is fixed to the rear cover 104 on the opposite side of the output side (opposite side of the gear G) with bolts 108, and the front cover 103 and the rear cover 104 are connected to several places with thin bolts (not shown). And fix. The front cover 103 and the rear cover 104 surround the rotor 101, the stator 20, the yokes 102a and 102b, and the fixed shaft S2, and are fixed to the case 105.

  Further, the rotor 110 and the rotating body 110 including the yokes 102a and 102b are supported by a rear bearing 106 at the rear in the rotational axis direction x around the fixed shaft S2 and a pilot bearing 107 at the front in the rotational axis direction x. In addition, the front yoke 102 b is supported by the main bearing 109 with respect to the front cover 103, and the rear yoke 102 a is supported by a fixed shaft S 2 fixed to the rear cover 104.

  As a result, the rotor 101 and the rotating body 110 including the yokes 102a and 102b can be supported by a so-called both-end support structure in which both the front and rear ends of the fixed shaft S2 are supported, so that the rigidity of the motor 100 can be increased. it can. As a result, it is possible to suppress the rattling and distortion of the gear G caused by the rattling and distortion of the rotor 101 during rotation, and to prevent the motor 100 from being damaged.

  And in order to reinforce the rotor core 111 comprised with the laminated electromagnetic steel plate, it has the structure similar to any one of the reinforcing plates 30, 41a-41c, 60, 74, or 83 of 1st-6th embodiment. A reinforcing plate 120 is used. The rotor 101 includes rotor cores 111a and 111b, exciting coils 112A and 112b, permanent magnets 113a and 113b, a reinforcing pin 114, and a reinforcing plate 120 having an insertion hole 121 through which the reinforcing pin 114 is inserted.

  Since the reinforcing plate 120 presses the substantially central portion of the rotor core 111 in the rotation axis direction x, even if centrifugal force acts on the rotor core 111 formed of laminated electromagnetic steel plates, the central portion is prevented from being deformed. Can do. Thereby, it is possible to improve efficiency by preventing an eddy current of the motor 100 and suppressing iron loss with a simple structure.

According to this configuration, the rigidity of the motor 100 can be increased by providing the rotor 101 with the reinforcing plate 120 and making the rotor 101 have a double-sided structure. In addition, the rotor core 111
Since a and 111b are composed of laminated magnetic steel sheets, and the exciting coils 112a and 112b and the yokes 102a and 102b can reduce the magnetic flux that exits from the rotor 101, the efficiency can be increased.

  As for the rotor 101, any of those described in the first to fifth embodiments including the combination of the reinforcing pin 114 and the reinforcing plate 120 is used. For example, as in the first embodiment, one that does not divide the exciting coil in the rotation axis direction x or one that includes a plurality of reinforcing pins 81 having a diameter D3 in the fifth embodiment can be used.

  In the embodiment, the fixing shaft S2 and the rear cover 104 are fixed by one bolt 108, but may be fixed by a plurality of bolts, and the fixing method is not limited. In addition, the gear G is screwed and fixed to the front end portion of the yoke 102b in the rotation axis direction x, but it is only necessary that the gear G can be fixed to the rotating body 110.

  Furthermore, in this embodiment, the brushless motor 100 having a double-sided structure has been described as the rotating electric machine. However, for example, it can be used as a brushless alternator having a double-sided structure.

  Since the rotor of the present invention can improve the strength of the rotor core composed of laminated electrical steel sheets that can improve efficiency by preventing eddy currents and suppressing iron loss with a simple structure, In particular, it can be used for rotating electric machines such as electric motors and generators mounted on vehicles.

1-5, 100 motor (rotary electric machine)
10, 40, 50, 70, 80 Rotor 11, 51a, 51b Rotor core 12, 52a, 52b Excitation coil 13, 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, 60, 74, 83 Reinforcing plates 31, 61, 75, 84 Insertion holes

Claims (7)

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 inserted or press-fitted into a hole for use,
A rotor comprising a reinforcing plate made of a non-magnetic material and dividing the facing surface in the rotation axis direction. The opposing surface is the outer peripheral surface of the rotor core,
The rotor according to claim 1, wherein the reinforcing plate formed in an annular shape divides the facing surface, the magnet hole, and the permanent magnet in a rotation axis direction. 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 that are provided in the vicinity of the facing surface so as to penetrate in the direction of the rotation axis and that are disposed at substantially equal intervals in the rotation circumferential direction and between the magnet holes, and for the reinforcement pin With a reinforcing pin inserted into the hole,
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.   5. The inner diameter of the insertion hole is made larger than the outer diameter of the reinforcing pin hole, and the outer diameter of the reinforcing pin in the vicinity of the insertion hole is made substantially equal to the inner diameter of the insertion hole. The rotor described in 1.   A rotating electrical machine comprising the rotor according to any one of claims 1 to 5.   The rotating electrical machine according to claim 6 is a brushless rotating electrical machine of an inner rotor type and a radial gap system.

Images