JP2021097564A - Coreless rotary electric machine and annular coil used for the same - Google Patents

Abstract

To provide a coreless rotary electric machine which prevents distortion of a free end (open end) of an annular coil by affection of an anti-torque accompanied by rotation on a yoke side, and a contact accident with a magnet or a yoke.SOLUTION: A coreless rotary electric machine has a rotor rotatably mounted on a casing, a rotor rotating together with the rotor, an annular coil that is inserted into an annular groove opened on one end face of the rotor and is cantilever-supported by a fixing member such as a casing, and a magnet that is mounted on a peripheral surface of the annular groove and faces the annular coil. A reinforcing ring is mounted to a position that is a free end of the cantilever-supported annular coil and is separated in an axial line direction from the magnet.SELECTED DRAWING: Figure 1

Description

The present invention relates to a coreless rotary electric machine and a ring coil used therein, and particularly relates to a coreless rotary electric machine having increased deformation strength on the free end side of the ring coil and a ring coil used therein.

As described in Patent Document 1, a coreless rotary electric machine represented by a coreless motor rotates and supports a rotary shaft at the center of a cylindrical case, and also has an annular coil arranged concentrically with the shaft. In addition to being fixedly arranged, an inner yoke and an outer yoke that can rotate together with the shaft are provided on the inner peripheral side and the outer peripheral side of the annular coil, and a magnet is arranged at a portion of the inner yoke or the outer yoke facing the annular coil. In the annulus coil, a conducting wire having an insulating layer and a heat-sealing layer formed on the outer peripheral surface is wound around, and the wound conducting wire is press-molded under heating to produce a cylindrical coil. ..

For the annulus coil, for example, polyimide is used as the heat fusion layer to maintain the annulus shape. Further, as shown in Patent Document 2, an uncured thermosetting resin is applied to the inner peripheral surface and the outer peripheral surface of the annular coil, and heat-cured to harden the coil. One end of such an annulus coil is firmly fixed by a fixed disk, and the other end is a free end (open end) and is attached in a so-called cantilever state. When mounting, insert the free end (open end) side through a small annular gap between the yoke and the magnet. As a result, even if the relative speed between the annulus coil and the rotor such as a magnet or yoke increases, contact between the coil and the rotor is prevented, and damage to the annulus coil is prevented.

However, when the motor is driven, when torque acts on the magnet side, on the contrary, anti-torque is generated in the annulus coil. Since one end of the annulus coil is fixed, the free end (open end) side is affected by the anti-torque, and the free end (open end) side cannot hold a circle and is distorted. This distortion may come into contact with rotors such as magnets and yokes. Such a defect is the same in the case of a coreless generator using an annular coil. Further, when a motor-mounted product is used for driving an automobile or the like, the annular coil may come into contact with the rotor due to external vibration such as road unevenness.

On the other hand, as in Patent Document 3, there is a coil coil that is fixed to the casing at the open end via a bearing. It doesn't exist. Further, the one shown in Patent Document 4 is also known, in which an annular coil rotates, an annular member is attached to the free end of the coil, and a counterbalance (protrusion on the peripheral edge) is provided on the tubular member. It is something that is. It is merely provided on the annular member so that a protrusion for rotational balance during rotation of the annular coil can be easily formed.

Japanese Unexamined Patent Publication No. 2017-70140 Japanese Unexamined Patent Publication No. 2004-32842 Japanese Unexamined Patent Publication No. 10-174355 Japanese Unexamined Patent Publication No. 2010-68609

Focusing on the above-mentioned conventional problems, the present invention prevents the free end (open end) of the annulus coil from being distorted due to the influence of anti-torque accompanying rotation on the yoke side, causing a contact accident with the magnet or the yoke. Is for.

In order to achieve the above object, the coreless rotary electric machine according to the present invention is inserted into a rotor rotatably attached to a casing, a rotor rotating together with the rotor, and an annular groove opened on one end surface of the rotor. In a coreless rotary electric machine having an annular coil that is cantilevered and supported by a fixing member such as a casing, and a magnet that is attached to the peripheral surface of the annular groove and faces the annular coil, the cantilevered support is provided. A reinforcing ring is attached to the free end of the annular coil at a position separated from the magnet in the axial direction.

In this case, the reinforcing ring may have an L-shaped cross section, and one of the cross sections may be in contact with the end face of the annular coil and the other may be in contact with the magnet arrangement side of the annular coil. Further, the reinforcing ring can be made of metal or resin. Further, the reinforcing ring may be attached to the folded end portion of the coil lead wire of the annular coil.

The annulus coil according to the present invention is an annulus coil composed of a plurality of conductors and formed in a cylindrical shape and used in a coreless rotary electric machine, and a reinforcing ring is provided at a portion where the conductors are folded back to form a cylindrical end. It was installed.

In the present invention, by attaching the reinforcing ring to the free end of the annulus coil that is cantilevered and separated from the magnet in the axial direction, torque is generated on the magnet side when the motor is driven, and the annulus coil side is generated. Even if anti-torque is generated. The reinforcing ring restrains the free end side of the annulus coil, and distortion due to its anti-torque can be prevented. This reinforcing ring can be easily attached if it has an L-shaped cross section. The reinforcing ring can be easily prevented from being distorted by making it from metal or resin. Further, since the reinforcing ring is attached to the folded end of the conducting wire of the annular coil, it does not affect the action of the coil.

It is sectional drawing of the coreless motor which concerns on Example. It is sectional drawing of the rotor assembly in the coreless motor which concerns on embodiment. It is sectional drawing of a coil ring. It is sectional drawing of an annulus coil. It is a perspective view of a coil ring. It is a perspective view of an annulus coil.

Hereinafter, specific examples of the coreless rotary electric machine according to the present invention and the annulus coil used therein will be described in detail with reference to the drawings.
It should be noted that the embodiments shown below are a part of a suitable embodiment for carrying out the present invention, and as long as the effect is exhibited, even if a part of the configuration is changed, it is one of the present inventions. It can be regarded as a department.

This embodiment is an example applied to a coreless motor. An assembly drawing of this coreless motor is shown in FIG. Exploded views are shown in FIGS. 2 to 4, and a rotor assembly (FIG. 2), a reinforcing ring (FIG. 3), and an annular coil (FIG. 4) are shown, respectively. Further, a perspective view of the reinforcing ring is shown in FIG. 5, and a perspective view of the annulus coil is shown in FIG.

The coreless motor is provided with a rotating shaft 12 at the center of a motor case 10 that surrounds the outer circumference, and a part thereof is projected outward from the case flange 14 to serve as an output shaft. The rotating shaft 12 is inserted into a cylindrical sleeve 16 formed on a flange 14 inside the motor case 10, and is pivotally supported by bearings 18 at two locations.

The inner inner part of the rotating shaft 12 protrudes from the cylindrical sleeve 16, and the hub 20 is attached to the protruding outer surface, and the rotor 21 is concentrically attached to the outer peripheral position of the cylindrical sleeve 16 via the hub 20. Therefore, the rotor 21 can rotate together with the rotating shaft 12. Although the rotor 21 has a cylindrical shape, its wall surface portion has a double structure to form an outer yoke 22 on the outer peripheral surface side and an inner yoke 24 on the inner peripheral surface side. The outer yoke 22 and the inner yoke 24 are folded back on the end surface side of the hub 20, and an annular gap 28 is opened on the other end side (the end portion on the flange 14 side). A magnet 26 made of a permanent magnet or the like is arranged and fixed in the annular gap 28 between the outer yoke 22 and the inner yoke 24, particularly on the inner peripheral surface of the outer yoke 22. The ring coil 30 is arranged in the ring gap 28 between the magnet 26 and the inner yoke 24.

The annular coil 30 is, for example, as shown in Japanese Patent Application Laid-Open No. 2017-70140, and forms a plurality of conductors and insulators in a predetermined shape, one of which is a folded portion of the conductor and the other of which is a wiring portion. It is formed in an annular shape and is formed by solidifying it using polyimide or the like. One end side (conductor wiring side) of such an annulus coil 30 is covered with a donut disk-shaped stator disk 32 arranged in the radial direction in a covered state, and is attached to the case flange 14 described above via a bolt or the like. Be done. As a result, it is firmly fixed to the case flange 14. A coil wiring board or the like is formed on the status disk 32. Further, a fixing ring 34 is provided at the outer peripheral position of the status disk 32.

The ring coil 30 configured in this way is inserted into the ring gap 28 on the free end side, but the magnet 26 and the ring coil 30 actually function as a coil in the range of the central portion of the body length. The length is different in the body length direction, and the length of the annulus coil 30 is longer than the length of the magnet 26 in the assembled state. That is, the free end of the coil as the coil end, which is the folded portion of the coil conducting wire, protrudes from the magnet 26 toward the inner part of the yoke.

In such a configuration, in this embodiment, the reinforcing ring 36 is attached to the free end of the cantilever-supported annular coil 30 at a position separated from the magnet 26 in the axial direction. That is, the innermost portion of the annulus gap 28 is a space formed by the outer yoke 22, the yoke bent portion, the free end of the annulus coil 30, and the tip surface of the magnet 26. The reinforcing ring 36 is located in this space and is fixed to the free end of the annular coil 30. As a result, the reinforcing ring 36 is in a fixed position together with the fixed annular coil 30, and the outer yoke 22, the inner yoke 24, and the magnet 26 rotate integrally around the reinforcing ring 36.

The reinforcing ring 36 has an L-shaped cross section, and is composed of a portion that receives the tip wall thickness of the free end of the annular coil 30 and a portion that protects the outer peripheral surface of the annular coil 30. Therefore, the reinforcing ring 36 is formed by carving out so that the above-mentioned L-shaped step is formed on the inner peripheral surface side of the ring material having a rectangular cross section slightly thicker than the wall thickness of the annular coil 30.

Further, the reinforcing ring 36 is formed of a metal material or a resin material which is a non-magnetic material. In the embodiment, it is made of brass. These may be non-magnetic materials, and may be very weak magnetic materials as long as they do not break the magnetic circuit formed by the rotor 21, the magnet 26, and the annulus coil 30.
The wiring of the ring coil 30 is connected to the power supply via the wiring connector 38 provided on the case.

In the coreless motor configured in this way, the rotor 21 rotates by supplying a predetermined current to the annulus coil 30 under the formation of a donut-shaped magnetic field in cross section between the outer yoke 22 and the inner yoke 24. , The rotating shaft 12 rotates through the hub 20. Anti-torque is generated in the ring coil 30 by the rotor 21 that rotates at the same time as the rotation of the rotating shaft 12. One end of the annulus coil 30 is firmly fixed by a stator disk 32 or the like, but the free end inserted into the annulus gap 28 of the rotor 21 may be distorted in a circular shape due to an anti-torque action. However, in this embodiment, it is restrained by the reinforcing ring 36, and the circular shape is not disturbed.

The reinforcing ring 36 can be easily attached by making it L-shaped, and can be easily attached even if it has irregularities by using an adhesive resin. Further, by forming the reinforcing ring 36 from metal or resin, it is possible to easily and easily prevent distortion.

According to such a configuration, the reinforcing ring 36 is attached to the free end of the cantilever-supported annular coil 30 at a position axially separated from the magnet 26, so that the reinforcing ring 36 is placed on the magnet 26 side when the motor is driven. Even if torque is generated and anti-torque is generated on the annular coil 30 side, the reinforcing ring 36 restrains the free end side of the annular coil 30 and distortion due to the anti-torque can be prevented. The reinforcing ring 36 has an L-shaped cross section so that it can be easily attached. The reinforcing ring 36 can be easily prevented from being distorted by being made of metal or resin. Further, since the reinforcing ring 36 is attached to the folded end portion of the conducting wire of the annular coil, it does not affect the operation of the coil.
These configurations can be applied to coreless structures such as generators.

10 ... Motor case, 12 ... Rotating shaft, 14 ... Case flange, 16 ... Cylindrical sleeve, 18 ... Bearing, 20 ... Hub, 21 ... Rotor, 22 ... Outer yoke, 24 ... Inner yoke, 26 ...... Magnet, 28 ... Annulus gap, 30 ... Annulus coil, 32 ... Status disk, 34 ... Fixed ring, 36 ... Reinforcing ring, 38 ... Wiring connector.

Claims (5)

A rotor rotatably attached to a casing, a rotor rotating with the rotor, an annular coil inserted into an annular groove opened on one end surface of the rotor and cantilevered and supported by a fixing member such as a casing, and the above. In a coreless rotary electric machine having a magnet attached to the peripheral surface of the annular groove and facing the annular coil, a position at the free end of the cantilevered annular coil and separated from the magnet in the axial direction. A coreless rotary electric machine characterized by having a reinforcing ring attached to it. The coreless rotary electric machine according to claim 1, wherein the reinforcing ring has an L-shaped cross section, one of which is in contact with the end face of the annular coil and the other is in contact with the magnet arrangement side of the annular coil. machine. The coreless rotary electric machine according to claim 1, wherein the reinforcing ring is made of metal or resin. The coreless rotary electric machine according to claim 1, wherein the reinforcing ring is attached to a folded end portion of a coil lead wire of an annular coil. An annulus coil composed of a plurality of conductors and formed in a cylindrical shape and used in a coreless rotary electric machine, characterized in that a reinforcing ring is attached to a portion where the conductors are folded back to form a cylindrical end. coil.

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