JP2017163752A - Rotor of permanent magnet dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress an increase in manufacturing cost, to easily manufacture, and to prevent fiber peeling while exhibiting sufficient strength even when a pressure is applied to a holding member from the inside to the outside. The purpose is to provide a rotor for a permanent magnet type rotary electric machine capable of producing a rotor. A permanent shaft (11), a plurality of permanent magnets (12) arranged around the rotor shaft (11), and a circular tubular holding member (13) for fixing the plurality of permanent magnets (12) to the rotor shaft (11). The rotor 10 of the magnet type rotary electric machine, the holding member 13, is provided on the inner peripheral portion side, and is provided on the hoop winding layer 14 in which the fibers 21 are hoop-wound and on the outer surface 14b of the hoop winding layer 14. , The fiber 22 has a helical winding layer 15 formed by helical winding. [Selection diagram] Fig. 1

Description

  The present invention relates to a rotor of a permanent magnet type rotating electrical machine, and more specifically to a rotor of a permanent magnet type rotating electrical machine in which a plurality of permanent magnets are fixed to a surface with a circular tubular holding member.

  As a rotor of a permanent magnet type rotating electrical machine, for example, a surface permanent magnet (SPM) rotating electrical machine in which a plurality of permanent magnets are fixed to the surface of the rotor shaft by press-fitting a cylindrical holding member. There is a child.

  In Patent Document 1 below, a CFRP ring is made permanent by press-fitting a circular carbon fiber reinforced plastic ring (hereinafter referred to as a CFRP ring) into a rotor shaft having a permanent magnet disposed on the outer surface. A method of fastening a magnet to a rotor shaft is disclosed.

  The following Patent Document 2 includes a sleeve fitted to a rotating shaft, a plurality of magnets arranged in the circumferential direction of the sleeve, and a holding member that holds the plurality of magnets on the rotating shaft, and the holding members are different from each other. A plurality of cylindrical members having a diameter and concentrically arranged. The cylindrical members are fitted into gaps, and the sleeve is expanded by hydraulic pressure supplied to the gap between the rotating shaft and the sleeve, and the magnet is A stationary rotor is disclosed.

JP 2005-312250 A JP2015-144550A

  However, in Patent Document 1, there is a possibility that strength is insufficient depending on the fiber orientation of the CFRP ring when pressure is applied to the CFRP ring from the inner diameter side to the outer diameter side. Therefore, it was considered that there is room for improvement when there is a demand for further improvement in strength.

  In Patent Document 2, in order to fix the magnet, the sleeve disposed inside the magnet needs to be thin and high in strength, resulting in an increase in manufacturing cost. Even if the CFRP ring is applied to a plurality of cylindrical members, the CFRP ring has a large processing tolerance width (about ± 0.05 mm) for the inner and outer diameters. It was very difficult to manage the tightening allowance and could not be manufactured easily.

Here, a rotor of a conventional rotating electrical machine will be described with reference to FIG.
As a rotor of a conventional permanent magnet type rotating electrical machine, for example, as shown in FIGS. 3A to 3C, a tubular shape in which a plurality of permanent magnets 102 arranged around the rotor shaft 101 is press-fitted. Some are fixed by the holding member 103. When the rotor of the permanent magnet type rotating electrical machine rotates at high speed, the centrifugal force in the radial direction of the rotor shaft 101 acts on the permanent magnet 102 and a large tensile stress acts in the circumferential direction of the holding member 103. It was composed of a hoop winding layer in which the fibers 121 were hoop-wound at 90 ° with respect to the central axis (rotation axis) C3 of the rotor shaft 101 having the highest tensile strength in the circumferential direction.

  By the way, the holding member 103 is manufactured by winding the fibers 121 in the circumferential direction of the mandrel while impregnating the resin with resin, curing the resin, and forming the resin, and then cutting both ends in the axial direction. For this reason, the cuts of the fibers 121 are exposed at both end portions 103 a and 103 b of the holding member 103. When a pressure from the inside to the outside is applied to the holding member 103 and the pressure exceeds the strength of the resin impregnated in the fiber 121, the fiber 121 exposed to the outer surface of both end portions 103a and 103b of the holding member 103. There was a possibility that the cuts of the peeled off.

  From the above, the present invention has been proposed in view of the above-described problems, and can be easily manufactured while suppressing an increase in manufacturing cost, and even if pressure is applied to the holding member from the inside to the outside. An object of the present invention is to provide a rotor of a permanent magnet type rotating electrical machine that can prevent occurrence of fiber peeling while exhibiting sufficient strength.

The rotor of the permanent magnet type rotating electrical machine according to the first invention for solving the above-described problem is:
A rotor of a rotating electrical machine comprising: a rotor shaft; a plurality of permanent magnets arranged around the rotor shaft; and a tubular holding member that fixes the plurality of permanent magnets to the rotor shaft. ,
The holding member is
A hoop winding layer provided on the inner peripheral side, the fiber being hoop-wrapped,
It is provided in the outer peripheral part of the said hoop winding layer, It has a helical winding layer by which a fiber is helically wound, It is characterized by the above-mentioned.

The rotor of the permanent magnet type rotating electrical machine according to the second invention for solving the above-mentioned problem is the rotor of the permanent magnet type rotating electrical machine according to the first invention,
The fibers of the helically wound layer extend in a high angle direction of 70 ° to 80 ° with respect to the central axis of the rotor shaft.

The rotor of the permanent magnet type rotating electrical machine according to the third invention that solves the above-described problem is the rotor of the permanent magnet type rotating electrical machine according to the first or second invention,
The fibers of the hoop winding layer are made of carbon fiber reinforced plastic, and the fibers of the helical winding layer are made of glass fiber reinforced plastic.

A rotor of a permanent magnet type rotating electrical machine according to a fourth invention that solves the above-described problem is a rotor of a permanent magnet type rotating electrical machine according to any one of the first to third inventions,
The thickness of the helical winding layer is smaller than the thickness of the hoop winding layer.

A rotor of a permanent magnet type rotating electrical machine according to a fifth invention for solving the above-described problem is a rotor of a permanent magnet type rotating electrical machine according to any one of the first to fourth inventions,
The helical wound layer is integral with the hoop wound layer.

A rotor of a permanent magnet type rotating electrical machine according to a sixth invention that solves the above-described problem is a rotor of a permanent magnet type rotating electrical machine according to any one of the first to fifth inventions,
The holding member has a shape that covers all of the plurality of permanent magnets in the axial direction of the rotor shaft.

  According to the present invention, the hoop winding layer can ensure the strength necessary to withstand press-fitting and centrifugal force. The helical wound layer can prevent the fibers of the hoop wound layer from peeling off. That is, even if pressure from the inside to the outside is applied to the holding member, it is possible to prevent the fibers from peeling off at both ends of the outer surface. In addition, since the holding member is composed of the hoop winding layer and the helical winding layer, sufficient strength can be exhibited even when pressure is applied to the holding member from the inside to the outside. Furthermore, the permanent magnet can be fixed to the rotor shaft only by fixing the holding member to the rotor shaft, and can be easily manufactured while suppressing an increase in manufacturing cost.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the rotor of the permanent-magnet-type rotary electric machine which concerns on main embodiment of this invention, Comprising: The outline is shown to Fig.1 (a), and the BB arrow cross section is shown to FIG.1 (b). FIG. 1 (c) shows a state before press-fitting the holding member included in the holding member. It is explanatory drawing of the manufacturing method of the said holding member, Comprising: The production state of the hoop winding layer with which it is shown to Fig.2 (a) is shown, and the production state of the helical winding layer with which it is provided in Fig.2 (b) is shown. It is explanatory drawing of the rotor of the conventional permanent magnet type rotary electric machine, Comprising: The perspective view is shown to Fig.3 (a), the cross section along the radial direction is shown to FIG.3 (b), The state before press-fitting the holding member with which is provided is shown.

  The rotor of the permanent magnet type rotating electrical machine according to the main embodiment of the present invention will be described below, but the present invention is not limited to the following embodiment.

[Main embodiments]
A rotor of a permanent magnet type rotating electrical machine according to a main embodiment of the present invention will be described with reference to FIGS. 1 (a) to 1 (c) and FIGS. 2 (a) and 2 (b). In FIG. 1 (a), the permanent magnet and the holding member are shown broken away.

  As shown in FIGS. 1A to 1C, the rotor 10 of the permanent magnet type rotating electrical machine according to the present embodiment includes a rotor shaft 11, a plurality of permanent magnets 12, and a holding member 13.

  The radial cross section of the rotor shaft 11 has a circular shape. The magnet mounting portion 11 a of the rotor shaft 11 has a shape having a larger diameter than the other portion 11 b of the rotor shaft 11.

  On the outer surface 11aa of the magnet mounting portion 11a of the rotor shaft 11, a plurality of permanent magnets 12 for constituting magnetic poles are arranged along the circumferential direction and the axial direction of the rotor shaft 11.

  On the outer surfaces 12a of the plurality of permanent magnets 12, the permanent magnets 12 are fastened to the outer surface 11aa of the rotor shaft 11, and a holding member 13 as a bind ring is attached. That is, the plurality of permanent magnets 12 are fixed to the outer surface 11aa of the rotor shaft 11 by press-fitting the holding member 13. In addition, the inner surface 14a of the hoop winding layer 14 of the holding member 13 is in contact with the outer surface 12a of the permanent magnet.

  The holding member 13 has a circular tube shape. The holding member 13 has a shape that covers the entire plurality of permanent magnets 12 arranged on the outer surface 11aa of the magnet mounting portion 11a of the rotor shaft 11 in the axial direction of the rotor shaft 11. The holding member 13 includes a hoop winding layer 14 and a helical winding layer 15.

The hoop winding layer 14 is provided on the inner peripheral side. The hoop winding layer 14 is made of a fiber impregnated with a synthetic resin. For example, a fiber made of carbon fiber reinforced plastic is preferably used as the fiber of the hoop winding layer 14. For example, a thermosetting resin such as an epoxy resin is preferably used as the synthetic resin. For example, as shown in FIG. 2A, the hoop winding layer 14 has a fiber 21 impregnated with the synthetic resin in a direction orthogonal to the central axis C <b> 2 of the mandrel 30 (central axis C <b> 1 of the rotor shaft 11). It is preferable that the hoop is wound. Thereafter, the fiber impregnated with the synthetic resin is cured (when the synthetic resin is a thermosetting resin, it is thermally cured) to form the hoop winding layer 14 of the holding member 13.
As the mandrel 30, for example, a plurality of permanent magnets 12 are arranged on the outer surface 11aa of the magnet mounting portion 11a of the rotor shaft 11, and the inner surface 14a of the hoop winding layer 14 of the holding member 13 is pressed into the plurality of The diameter of the permanent magnet 12 having a fastening allowance that can fix the permanent magnet 12 to the rotor shaft 11 is used.

  The helical winding layer 15 is provided on the outer surface (outer peripheral portion) 14 b side of the hoop winding layer 14 and so as to cover the entire hoop winding layer 14 in the axial direction of the rotor shaft 11. The inner surface 15 a of the helical winding layer 15 is in contact with the outer surface 14 b of the hoop winding layer 14. The helical wound layer 15 is made of a fiber impregnated with a synthetic resin. As the fiber of the helical wound layer 15, for example, a fiber made of carbon fiber reinforced plastic or a fiber made of glass fiber reinforced plastic having a lower tensile elastic modulus than that of carbon fiber reinforced plastic is preferably used. For example, a thermosetting resin such as an epoxy resin is preferably used as the synthetic resin. For example, as shown in FIG. 2 (b), the helical winding layer 15 includes a fiber 22 impregnated with the synthetic resin that is 70 ° to 80 ° with respect to the central axis C 2 of the mandrel 30 (central axis C 1 of the rotor shaft 11). It is preferable that the coil is helically wound in a direction that forms a high angle θ of °. Thereby, the fiber 22 of the helical wound layer 15 is folded at the break of the fiber 21 exposed at the axial end portion of the hoop winding layer 14, and the outer surface 14 b of the axial end portion of the hoop winding layer 14. Thus, peeling of the fibers 21 of the hoop winding layer 14 is prevented. Thereafter, the fiber impregnated with the synthetic resin is cured (if the synthetic resin is a thermosetting resin, it is thermoset) to form the helical wound layer 15 of the holding member 13.

  In addition, the holding member 13 including the hoop winding layer 14 and the helical winding layer 15 is formed into a desired size by cutting an end portion in the axial direction into a ring.

Therefore, according to the present embodiment, the rotor shaft 11, the plurality of permanent magnets 12 arranged around the rotor shaft 11, and the tubular holding member that fixes the plurality of permanent magnets 12 to the rotor shaft 11. The holding member 13 is provided on the inner peripheral side, and is formed on the outer surface 14b of the hoop winding layer 14 and the hoop winding layer 14 in which the fibers 21 are hoop-wound. By providing the helical wound layer 15 in which the fibers 22 are helically wound, the hoop wound layer 14 of the holding member 13 can ensure the strength necessary to withstand press-fitting and centrifugal force. The helical winding layer 15 of the holding member 13 can prevent the fibers 21 of the hoop winding layer 14 from peeling off. That is, in the helical wound layer 15, the fibers 22 are wound in a mesh pattern, and the cuts of the fibers 22 are exposed at both end portions of the holding member 13 cut in a circular cut. In the helical wound layer 15, unlike the hoop wound layer 14, the fibers 22 are woven and wound in a mesh shape, and the fibers 22 extending in different directions are woven in a plurality of thickness directions. Is in a state where it is difficult to peel off. Therefore, even if the pressure from the inside to the outside is applied to the holding member 13, it is possible to prevent the fibers 22 from being peeled from both end portions on the outer surface. In addition, since the holding member 13 includes the hoop winding layer 14 and the helical winding layer 15, even if pressure is applied to the holding member 13 from the inside to the outside, sufficient strength can be expressed. Thereby, the diameter expansion strength by press-fitting into the rotor shaft 11 and the anti-centrifugal strength due to the rotation of the rotor 10 of the rotating electrical machine are increased, which is suitable for high-speed rotation (for example, rotation speed of 10,000 min ⁻¹ or more). It can be a structure. Furthermore, the permanent magnet 12 can be fixed to the rotor shaft 11 simply by fixing the holding member 13 to the rotor shaft 11, and can be easily manufactured while suppressing an increase in manufacturing cost.

  The fibers 22 of the helically wound layer 15 extend in the direction of a high angle of 70 ° to 80 ° with respect to the central axis C1 of the rotor shaft 11, so that the fibers 22 of the helically wound layer 15 become hoop wound layers. 14 extends in a direction different from the extending direction of the fibers 21, and the fibers 21 can be more reliably prevented from peeling off at both ends of the hoop winding layer 14.

  As a modification of the present embodiment, when the fiber 21 of the hoop wound layer 14 is a fiber made of carbon fiber reinforced plastic and the fiber 22 of the helical wound layer 15 is a fiber made of glass fiber reinforced plastic, the glass fiber reinforced plastic is used. Since the tensile elastic modulus itself is lower than that of the carbon fiber reinforced plastic, it is possible to suppress the possibility of peeling on the surface as compared with the case where the fiber 22 of the helical wound layer 15 is a fiber made of carbon fiber reinforced plastic. .

  The thickness d2 of the helical winding layer 15 is preferably smaller than the thickness d1 of the hoop winding layer 14, and is more preferably 1/8 or less, for example. The thickness d2 of the helical winding layer 15 is more preferably 1/8 with respect to the thickness d1 of the hoop winding layer 14, and even more preferably less than 1/8. This is due to the thickness d1 that secures the required strength according to the peripheral speed of the rotor 10 of the permanent magnet type rotating electric machine by the hoop winding layer 14 and the thickness d2 that the fiber 22 is folded at the axial end by the helical winding layer 15. This is because the gap between the rotor 10 and the stator (not shown) of the permanent magnet type rotating electrical machine can be effectively prevented.

  The helical winding layer 15 is preferably provided directly on the outer surface 14 b of the hoop winding layer 14. Thereby, the hoop winding layer 14 and the helical winding layer 15 are integrated, and the operation of fixing the plurality of permanent magnets 12 to the rotor shaft 11 can be easily performed.

  As for the holding member 13 mentioned above, it is preferable that the hoop winding layer 14 and the helical winding layer 15 are comprised integrally. This is because it is possible to easily fix the plurality of permanent magnets 12 to the rotor shaft 11 as compared with the case where the hoop winding layer 14 and the helical winding layer 15 of the holding member 13 are separated. .

[Other Embodiments]
A rotor of a permanent magnet type rotating electrical machine in which a plurality of permanent magnets are fitted in grooves provided on the outer surface of the rotor shaft, and the outer surfaces of the plurality of permanent magnets are positioned radially outward from the outer surface of the rotor shaft. A permanent magnet type in which a plurality of permanent magnets are fitted in grooves provided on the outer surface of the rotor shaft, and the outer surfaces of the plurality of permanent magnets are the same in radial direction as the outer surface of the rotor shaft It can be applied to a rotor of a rotating electrical machine.

  Although the description has been given using the holding member 13 in which the hoop winding layer 14 and the helical winding layer 15 are integrally formed, the hoop winding layer 14 and the helical winding layer 15 of the holding member 13 may be configured separately.

DESCRIPTION OF SYMBOLS 10 Rotor 11 of permanent magnet type rotary electric machine Rotor shaft 11a Magnet attachment part 11aa Outer surface 11b Parts other than magnet attachment part 12 Permanent magnet 12a Outer surface 13 Holding member 14 Hoop winding layer 14a Inner surface (inner peripheral part)
14b Outer surface (outer periphery)
15 Helical wound layer 15a Inner surface (inner periphery)
21, 22 Fiber 30 Mandrel d1 Hoop winding layer thickness d2 Helical winding layer thickness

Claims (6)

A rotor of a rotating electrical machine comprising: a rotor shaft; a plurality of permanent magnets arranged around the rotor shaft; and a tubular holding member that fixes the plurality of permanent magnets to the rotor shaft. ,
The holding member is
A hoop winding layer provided on the inner peripheral side, the fiber being hoop-wrapped,
A rotor of a permanent magnet type rotating electrical machine, comprising: a helical winding layer provided on an outer peripheral portion of the hoop winding layer and having a fiber helically wound. A rotor of the permanent magnet type rotating electrical machine according to claim 1,
The rotor of the permanent magnet type rotating electrical machine, wherein the fibers of the helical winding layer extend in a high angle direction of 70 ° to 80 ° with respect to a central axis of the rotor shaft. A rotor for a permanent magnet type rotating electrical machine according to claim 1 or 2,
The rotor of a permanent magnet type rotating electrical machine, wherein the fibers of the hoop winding layer are made of carbon fiber reinforced plastic, and the fibers of the helical winding layer are made of glass fiber reinforced plastic. A rotor of a permanent magnet type rotating electrical machine according to any one of claims 1 to 3,
A rotor of a permanent magnet type rotating electrical machine, wherein the thickness of the helical winding layer is smaller than the thickness of the hoop winding layer. A rotor for a permanent magnet type rotating electrical machine according to any one of claims 1 to 4,
The rotor of a permanent magnet type rotating electrical machine, wherein the helical winding layer is integral with the hoop winding layer. A rotor of a permanent magnet type rotating electrical machine according to any one of claims 1 to 5,
The rotor of a permanent magnet type rotating electrical machine, wherein the holding member has a shape covering the whole of the plurality of permanent magnets in an axial direction of the rotor shaft.

Images