JPWO2018216161A1 - Rotor and rotating electric machine - Google Patents

Abstract

The rotor (10) comprises a cylindrical sleeve (2) and a plurality of split magnets (3) spaced apart on the outer periphery (2o) of the sleeve (2). The rotor (10) is formed of an inorganic material, and includes a plurality of interpolar members (4) disposed on the outer periphery (2o) of the sleeve (2) among the plurality of split magnets (3). The rotor (10) is a component integrally formed in the circumferential direction, and includes reinforcing sleeves (5) disposed on the outer circumferences (3o, 4o) of the plurality of split magnets (3) and the plurality of interpole members (4). Prepare.

Description

  The present invention relates to a surface permanent magnet type rotor and a rotating electrical machine.

  In a rotor of a surface magnet type motor in which a rotor member composed of a split magnet, a sleeve and a reinforcing sleeve is fixed to a shaft, the shaft is press-fit and fastened in a sleeve which is a rotor core of the rotor member. A force in the radial direction from the inner diameter side to the outer diameter side is applied to the divided magnets disposed on the outer periphery of the sleeve. Therefore, when the shaft is pressed into the rotor member, a force is applied to the reinforcing sleeve to push it out from the split magnet. Here, the reinforcing sleeve is formed of a material of high strength and high rigidity, and receives the force from the split magnet without breaking it. Therefore, the split magnet is sandwiched and fastened from both sides by the sleeve on the inner diameter side and the reinforcing sleeve on the outer diameter side. Since the split magnet is sandwiched between the sleeve and the reinforcing sleeve, the split magnet can follow the shaft without slipping in the circumferential direction when the rotor generates torque when the motor is driven.

  As in the invention disclosed in Patent Document 1, a gap is formed between the plurality of divided magnets disposed on the outer periphery of the sleeve.

JP-A-59-117450

  The force applied from the split magnet to the reinforcing sleeve is not only the force by the shaft press-in, but also the force by the centrifugal force of the split magnet when the rotor rotates. However, in the invention disclosed in Patent Document 1, since the spaces between the divided magnets are air gaps, the stress generated in the reinforcing sleeve due to the centrifugal force when the rotor rotates is not uniform in the circumferential direction. That is, the stress applied to the reinforcing sleeve by the centrifugal force is different between the portion where the split magnets are disposed and the portion of the air gap. Therefore, a shear force is generated at the boundary between the portion where the split magnet is disposed and the space portion due to the difference in magnitude of the stress generated by the centrifugal force, and the strength of the reinforcing sleeve is reduced due to fatigue. There was a problem that.

  This invention is made in view of the above, Comprising: It aims at obtaining the rotor which suppressed the fall of the intensity | strength of the reinforcement sleeve by the centrifugal force at the time of rotation.

  In order to solve the problems described above and to achieve the object, the present invention provides a plurality of divided sleeves formed of an inorganic material and a cylindrical sleeve, a plurality of divided magnets spaced around the outer periphery of the sleeve, and And a plurality of interpolar members disposed on the outer periphery of the sleeve between the magnets. The present invention is a component integrally formed in the circumferential direction, and includes a plurality of divided magnets and a reinforcing sleeve disposed on the outer periphery of the plurality of interpole members.

  The rotor according to the present invention has the effect of being able to suppress the reduction in strength of the reinforcing sleeve due to the centrifugal force at the time of rotation.

Sectional view perpendicular to the rotation axis of the rotor according to Embodiment 1 of the present invention Sectional view along the rotation axis of the rotor according to the first embodiment Sectional view along the rotation axis of the rotor according to the first embodiment Sectional drawing perpendicular | vertical to the rotating shaft in the state which arrange | positions the interpolar member in the outer periphery of the sleeve of the rotor which concerns on Embodiment 1. Sectional view perpendicular to the rotation axis in the state where the divided magnets are arranged on the outer periphery of the sleeve of the rotor according to the first embodiment Sectional drawing perpendicular | vertical to the rotating shaft in the state which has arrange | positioned the reinforcement sleeve around the outer periphery of the split magnet of the rotor which concerns on Embodiment 1. The figure which shows the contact state of the sleeve and pole member before pressing-in the shaft of the rotor which concerns on Embodiment 2 of this invention. The figure which shows the contact state of the sleeve and interpolar member before pressing-in the shaft of the rotor which concerns on Embodiment 1. The figure which shows the cross-sectional shape of the interpolar member of the rotor which concerns on Embodiment 3 of this invention. The figure which shows the part which needs to process a raw material, in order to form the interpolar member of the rotor which concerns on Embodiment 3. The figure which shows the contact state of the interpolar member of a rotor and sleeve which concern on Embodiment 4 of this invention. The figure which shows the structure of the rotary electric machine using the rotor which concerns on either of Embodiment 1 to 4.

  Hereinafter, a rotor and a rotating electrical machine according to an embodiment of the present invention will be described in detail based on the drawings. The present invention is not limited by the embodiment.

Embodiment 1
FIG. 1 is a cross-sectional view perpendicular to the rotation axis of the rotor according to Embodiment 1 of the present invention. 2 and 3 are cross-sectional views along the rotation axis of the rotor according to the first embodiment. 2 shows a cross section taken along the line II-II in FIG. 1, and FIG. 3 shows a cross section taken along the line III-III in FIG. The rotor 10 according to the first embodiment includes a cylindrical sleeve 2, a plurality of split magnets 3 disposed at intervals on the outer periphery 2 o of the sleeve 2, and a plurality of poles disposed in a gap between the split magnets 3. An intermediate member 4 and a reinforcing sleeve 5 disposed on the outer circumferences 3 o and 4 o of the split magnet 3 and the inter-pole member 4 are provided. The rotor 10 further comprises a shaft 1 which is inserted into the sleeve 2 and pushes it apart. The rotor 10 rotates with the axis O as a rotation axis.

  The sleeve 2 has a tapered inner periphery 2i. The shaft 1 is a tapered shaft whose side surface 1s has a taper, and is press-fitted to the sleeve 2. The shaft 1 and the sleeve 2 can be fixed without heating the split magnet 3 by pressing the shaft 1 having the tapered side 1s into the sleeve 2. The split magnet 3 and the interpolar member 4 are interposed between the sleeve 2 into which the shaft 1 is press-fitted and the reinforcing sleeve 5, and the friction generated between the sleeve 2 and the friction generated between the sleeve 2 and the reinforcing sleeve 5. It is fixed by force.

  The reinforcing sleeve 5 is a seamless integral part. As the material of the reinforcing sleeve 5, a material having a strength that does not cause plastic deformation even when a force in the radial direction is applied to the inner periphery 5i when the shaft 1 is press-fit into the sleeve 2 is applied. An example of the material of the reinforcing sleeve 5 may include carbon fiber reinforced plastic.

  In the first embodiment, an inorganic material having a specific gravity larger than 2 is applied to the material of the interpolar member 4. The specific gravity of the resin material is at most 2 while the specific gravity of the divided magnet 3 is about 7. Therefore, by forming the interpolar member 4 with an inorganic material having a specific gravity larger than 2, the interpolar member is more than when the space between the divided magnets 3 is a void or when the interpolar member 4 is formed of a resin material The force generated by the centrifugal force 4 and applied to the reinforcing sleeve 5 and the force generated by the centrifugal force and applied to the reinforcing sleeve 5 at the portion where the split magnet 3 is disposed are made uniform. Needless to say, the closer the specific gravity of the interpolar member 4 is to the specific gravity of the divided magnets 3, the more uniformly the force applied to the reinforcing sleeve 5.

  The material of the interpolar member 4 may be a magnetic material. Magnetic materials applied to the interpolar member 4 include carbon steel having a specific gravity of 7.9, chromium molybdenum steel having a specific gravity of 7.9, ferritic stainless steel having a specific gravity of 7.8, and martensitic stainless steel having a specific gravity of 7.8. Although it can illustrate, it is not limited to these.

  In addition, when the magnetic circuit which comprises the rotor 10 is considered, it is preferable that the material of the interpolar member 4 is a nonmagnetic material. This is because when the interpolar member 4 is a magnetic material, the magnetic flux emitted by the divided magnets 3 interlinks the interpolar member 4 and the magnetomotive force is weakened. That is, if the interpolar member 4 is formed of a nonmagnetic material, the magnetomotive force of the rotor 10 will not be weakened. Examples of nonmagnetic materials applied to the interpolar member 4 include aluminum with a specific gravity of 2.7, titanium with a specific gravity of 4.5, and austenitic stainless steel with a specific gravity of 7.9, but are not limited thereto.

  An assembly procedure of the rotor 10 according to the first embodiment will be described. FIG. 4 is a cross-sectional view perpendicular to the rotation axis in a state in which the interpolar member is disposed on the outer periphery of the sleeve of the rotor according to Embodiment 1. First, the interpolar member 4 is placed on the outer periphery 2 o of the sleeve 2 with an adhesive. When the interpolar member 4 is disposed, the distance between the interpolar members 4 is set to a prescribed value by positioning using a jig.

  Thereafter, the split magnet 3 is installed with an adhesive in a portion between the interpolar members 4 of the outer periphery 2 o of the sleeve 2. FIG. 5 is a cross-sectional view perpendicular to the rotation axis in a state in which divided magnets are disposed on the outer periphery of the sleeve of the rotor according to Embodiment 1. Here, by making the distance between the interpolar members 4 equal to the dimension of the split magnet 3, positioning can be performed only by arranging the split magnets 3 between the interpolar members 4. The need for positioning is eliminated, and manufacture is facilitated. The distance between the interpolar members 4 may be larger than that of the divided magnets 3 as long as the positioning error is within an allowable range. In terms of motor characteristics, it is desirable that the gaps between the divided magnets 3 be equal in size.

  In the process of installing the interpolar member 4 and the split magnet 3 on the outer periphery 2o of the sleeve 2 with an adhesive, it is preferable that the curing time of the adhesive be short in order to reduce the time for manufacturing cost reduction. Therefore, as the adhesive for placing the interpolar member 4 and the split magnet 3 on the outer periphery 2 o of the sleeve 2, it is preferable to use a quick-hardening adhesive. The interpolar member 4 and the split magnet 3 are preferably installed using the same curing adhesive. By using the same curing type adhesive for the installation of the interpolar member 4 and the installation of the split magnet 3, it is not necessary to separately perform the process of curing the adhesive, and the number of steps can be reduced. As a specific example, if a thermosetting adhesive is used for installing the interpolar member 4 and an anaerobic curing adhesive is used for installing the split magnet 3, it is necessary to separately perform the steps of curing the adhesive. However, if the adhesive of the anaerobic curing type is used for the installation of the interpolar member 4 and the installation of the split magnet 3, the process of curing the adhesive becomes one process.

  After the split magnets 3 are disposed on the outer circumference 2 o of the sleeve 2, the reinforcing sleeve 5 is disposed on the outer circumferences 3 o and 4 o of the split magnet 3 and the interpole member 4. FIG. 6 is a cross-sectional view perpendicular to the rotation axis in the state in which the reinforcing sleeve is disposed on the outer periphery of the split magnet of the rotor according to the first embodiment. After the reinforcing sleeve 5 is disposed on the outer circumferences 3 o and 4 o of the split magnet 3 and the interpolar member 4, the rotor 10 shown in FIGS. 1 to 3 is configured by pressing the shaft 1 into the sleeve 2 and assembling. Be done.

  In the rotor 10 according to the first embodiment, since the interpole member 4 is disposed between the divided magnets 3, when the rotor 10 rotates, the centrifugal force is generated at the portion where the divided magnets 3 are disposed. The difference between the force generated by the force applied to the reinforcing sleeve 5 and the force generated by the centrifugal force at the portion where the split magnet 3 is not disposed is applied to the reinforcement sleeve 5 It becomes smaller than it does not arrange. Therefore, it is possible to suppress a decrease in the strength of the reinforcing sleeve 5 due to fatigue caused by the centrifugal force at the time of rotation.

  In the first embodiment, the shape of the interpolar member 4 may be a rectangular parallelepiped, or the inner or outer periphery may be curved in a circular arc, etc., and the shape is not limited to a rectangular parallelepiped. Also, instead of the shaft 1, another sleeve having a taper on the outer periphery may be inserted into the sleeve 2.

Second Embodiment
FIG. 7 is a view showing a state of contact between the sleeve and the interpolar member before press-fitting the shaft of the rotor according to Embodiment 2 of the present invention. FIG. 8 is a view showing a contact state between the sleeve 2 and the interpolar member 4 before press-fitting the shaft of the rotor according to the first embodiment. An axially extending groove 41 is formed at the central portion in the circumferential direction of the rotor 10 on the inner periphery 4i of the interpole member 4 of the rotor 10 according to the second embodiment. Others are the same as the rotor 10 according to the first embodiment. The assembly procedure of the rotor 10 is the same as that of the first embodiment.

The sleeve 2 has an outer diameter size increased by press-fitting the shaft 1. Therefore, the inner periphery 4i of the interpolar member 4 has a curvature equal to or greater than the outer periphery 2o of the sleeve 2 after the shaft 1 is press-fit, and as shown in FIG. in contact line with only _a portion P from the front of the inner circumference 4i of the peripheral 2o and interpole member 4 of the sleeve 2 press-fitting the shaft 1, is bonded by an adhesive. In the rotor 10 according to the second embodiment, since the groove 41 is formed on the inner periphery 4i of the interpolar member 4, as shown in FIG. 7, the outer periphery 2o of the sleeve 2 and the poles before the shaft 1 is press fitted. the inner circumference 4i between member 4, in a state of line contact with two points of P ₂ parts and P ₃ parts, are adhesively bonded. Therefore, the interpolar member 4 can be stably disposed on the outer periphery 2 o of the sleeve 2, and assembly failure caused by the positional deviation of the interpolar member 4 is less likely to occur.

  The interpolar member 4 can be stably disposed on the outer periphery 2 o of the sleeve 2 by providing a groove not on the inner periphery 4 i of the interpolar member 4 but on the outer periphery 2 o of the sleeve 2. However, when the groove is provided in the sleeve 2, when the shaft 1 is press-fitted, stress concentration occurs at the groove portion. Therefore, in order to prevent the strength of the rotor 10 from being reduced, it is better to form the groove 41 in the inner periphery 4i of the interpolar member 4. Further, when the groove is provided on the outer periphery 2 o of the sleeve 2, when the inter-polar member 4 is arranged on the outer periphery 2 o of the sleeve 2, the inter-polar member 4 needs to be arranged in accordance with the groove. Therefore, it is better to form the groove 41 on the inner periphery 4i of the interpolar member 4 in order to suppress the decrease in versatility.

Third Embodiment
FIG. 9 is a view showing the cross-sectional shape of the interpole member of the rotor according to Embodiment 3 of the present invention. The side surface 42 of the interpole member 4 of the rotor 10 according to the third embodiment is parallel to a line L connecting the axis O of the rotor 10 and the point M. The point M is a midpoint of an arc formed by the outer periphery 4 o in a cross section perpendicular to the axis O. Others are the same as the rotor 10 according to the first embodiment. The assembly procedure of the rotor 10 is the same as that of the first embodiment.

  Since the material to be the material of industrial products is generally distributed in a flat plate or flat rod shape, a line L connecting the axis O of the rotor 10 and the point M and the side surface 42 of the interpolar member 4 If parallel, the side surface of the material can be used for the side surface 42 of the interpolar member 4. FIG. 10 is a view showing a portion where it is necessary to process a material to form an interpole member of a rotor according to a third embodiment. The interpolar member 4 can be formed by processing the portions A, B and C of the rectangular parallelepiped material 50. On the other hand, when the side surface 43 of the interpolar member 4 is not parallel to the line L connecting the axis O of the rotor 10 and the point M, and is shaped along the side surface of the split magnet, the side surface 43 of the interpolar member 4 is , The tapering processing which makes a surface by machining is needed. That is, in order to form the interpolar member 4 from the material 50, it is necessary to process the D part and the E part in addition to the A part, the B part and the C part in FIG. Therefore, by making the side surface 42 of the interpolar member 4 parallel to the line L connecting the axis O of the rotor 10 and the point M, machining of the taper to the side surface 42 of the interpolar member 4 becomes unnecessary. The manufacturing cost can be reduced.

  In the second embodiment, the side surfaces 42 of the interpolar member 4 are made parallel, but when cutting out the interpolar member 4 from a flat plate, an angle in a range which is generated due to a manufacturing error is allowed.

  While combining the second embodiment and the third embodiment, a groove is provided on one of the outer periphery 2 o of the sleeve 2 and the inner periphery 4 i of the interpolar member 4, and the side surface 42 of the interpolar member 4 is on the axis O It is also possible to make it parallel to a line L connecting the center point of the arc formed by the outer periphery 4 o in the vertical cross section and the axis O of the rotor 10.

Fourth Embodiment
FIG. 11 is a view showing a state of contact between the interpole member of the rotor and the sleeve according to Embodiment 4 of the present invention. In the rotor 10 according to the fourth embodiment, the protrusion 21 is provided on the outer periphery 2 o of the sleeve 2, and the recess 44 is provided on the inner periphery 4 i of the interpolar member 4. Others are the same as the rotor 10 according to the first embodiment. The assembly procedure of the rotor 10 is the same as that of the first embodiment.

  When the rotational speed of the rotor 10 is accelerated or decelerated by engaging the convex portion 21 on the sleeve 2 side with the concave portion 44 on the interpolar member 4 side, the inertia force acting on the split magnet 3 is the sleeve 2 and the reinforcement. Even if the frictional force generated in the interpolar member 4 by being sandwiched by the sleeve 5 is larger than the frictional force generated by the interpolar member 4, the interpolar member 4 can follow the rotation without being displaced with respect to the sleeve 2 and the reinforcing sleeve 5.

  Even if a recess is provided on the outer periphery 2 o of the sleeve 2 and a protrusion is provided on the inner periphery 4 i of the interpolar member 4, the effect of preventing the interpolar member 4 from shifting can be obtained. However, as described above, since stress is generated in the sleeve 2 by press-fitting the shaft 1, in order to prevent damage of the sleeve 2 due to stress concentration, the convex portion 21 is provided on the outer periphery 2o of the sleeve 2 It is better to provide the recess 44 in the inner periphery 4i of the member 4.

  A combination of the third embodiment and the fourth embodiment provides a convex portion on one of the outer periphery 2o of the sleeve 2 and the inner periphery 4i of the interpolar member 4 and a concave portion on the other side. It is also possible to make 42 parallel to a line L connecting the center O of the arc formed by the outer periphery 4 o with the axis O of the rotor 10 in a cross section perpendicular to the axis O.

  Although the shaft 1 is pressed into the sleeve 2 in each of the above-described embodiments, the non-tapered shaft and the sleeve may be shrink-fit. When shrink fitting the shaft and the sleeve, it is necessary to carry out at a temperature at which the magnetic force of the split magnet does not decrease. The temperature at which the magnetic force of the divided magnets decreases is 140 ° C., for example. Therefore, it is possible to shrink fit the shaft and the sleeve when it is possible to secure a shrink fit margin that satisfies the design strength even at a temperature or less at which the magnetic force of the divided magnets decreases.

  FIG. 12 is a diagram showing a configuration of a rotary electric machine using the rotor according to any one of the first to fourth embodiments. The rotor 10 according to any one of the first to fourth embodiments can configure the rotary electric machine 30 by being inserted into the cylindrical stator 20. That is, by using the rotor 10 according to any one of the first to fourth embodiments, it is possible to obtain the rotary electric machine 30 including the rotor 10 in which the decrease in the strength of the reinforcing sleeve 4 due to fatigue is suppressed.

  The configuration shown in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and one of the configurations is possible within the scope of the present invention. Parts can be omitted or changed.

  1 shaft, 2 sleeves, 2i, 4i, 5i inner circumference, 2o, 3o, 4o outer circumference, 3 split magnets, 4 interpole members, 5 reinforcing sleeves, 10 rotors, 20 stators, 21 convex parts, 30 rotary electric machines, 41 groove, 42, 43 side surface, 44 recess, 50 material.

FIG. 12 is a diagram showing a configuration of a rotary electric machine using the rotor according to any one of the first to fourth embodiments. The rotor 10 according to any one of the first to fourth embodiments can configure the rotary electric machine 30 by being inserted into the cylindrical stator 20. That is, by using the rotor 10 according to any one of the first to fourth embodiments, it is possible to obtain the rotary electric machine 30 provided with the rotor 10 in which the decrease in the strength of the reinforcing sleeve 5 due to fatigue is suppressed.

Claims (8)

With a cylindrical sleeve,
A plurality of divided magnets spaced apart on the outer periphery of the sleeve;
A plurality of interpolar members formed of an inorganic material and disposed on the outer periphery of the sleeve among the plurality of divided magnets;
A rotor, which is a component integrally formed in a circumferential direction, and includes a plurality of the divided magnets and a reinforcing sleeve disposed on the outer periphery of the plurality of interpolar members.   The rotor according to claim 1, wherein the interpolar member has an axially extending groove formed on an inner periphery thereof.   The rotor according to claim 1 or 2, wherein the side surface of the interpolar member is parallel to a line connecting the center point of the outer periphery and the rotation axis of the rotor in a cross section perpendicular to the axial direction. .   The rotor according to any one of claims 1 to 3, wherein concavities and convexities that engage with each other are formed on the outer periphery of the sleeve and the inner periphery of the interpolar member.   The rotor according to any one of claims 1 to 4, wherein the interpolar member is formed of a material having a specific gravity of greater than 2.   The rotor according to any one of claims 1 to 5, wherein the interpolar member is formed of a nonmagnetic material.   The rotor according to any one of claims 1 to 6, wherein the sleeve has a taper on its inner periphery and comprises a shaft press-fit into the sleeve. A rotor according to any one of claims 1 to 7;
And a cylindrical stator into which the rotor is inserted.

Images