JP2010068609A - Coreless motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coreless motor capable of easily adjusting balance of a rotor without requiring machining. <P>SOLUTION: The coreless motor 1 includes a cup-type rotor 2 equipped with a cylindrical coil 5; a stator 3 consisting of a permanent magnet fixed inside the rotor 2; and a housing 4 for housing the stator 3 and the rotor 2. In the coreless motor 1, a circular member 15 having a fitting portion 15a of a U-shaped or laterally U-shaped cross section or an L-shaped concave portion and a convex portion 15b as a balance weight is fitted to the peripheral edge of an opening end of the coil 5. Further, the circular member 15 is fitted to the peripheral edge of the coil 5, and boded using a thermosetting adhesive. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a coreless motor having a cup-type rotor provided with a cylindrical coil.

  This type of coreless motor having no core includes a cup-type rotor having a cylindrical coil, a stator composed of a permanent magnet fixed inside the rotor, and the stator and the rotation. Although it is configured to include a housing that accommodates the child, it is used in, for example, a drive source of a radio control model, a monitoring camera, a medical device, and the like because it can be downsized.

  In such a coreless motor, when an imbalance occurs in a rotor that rotates at high speed, vibration and noise are generated, and normal operation becomes impossible.

  Therefore, the balance of the rotor has been conventionally adjusted. For example, after assembling the rotor, the balance measurement device measures the unbalance position and the unbalance amount of the rotor, and the rotor is based on the measurement result. After the balance adjustment putty is attached to the balance, the balance is adjusted again by measuring the unbalance position and the unbalance amount of the rotor with the balance measuring device. The unbalance amount of the rotor is within the predetermined allowable range. The method of repeating the above work until entering.

Further, Patent Document 1 proposes a technique for adjusting the balance of the rotor by forming a plurality of holes in the rotor core and attaching a balance adjusting pin to the holes by a method such as press fitting.
JP 2004-159474 A

  However, with the method of attaching the balance adjustment putty to the rotor, the balance adjustment putty may fall off due to centrifugal force during the rotation of the rotor, and it is necessary to take countermeasures. There is a problem that man-hours are large.

  Moreover, in the technique described in Patent Document 1, it is necessary to separately process a hole for mounting the balance adjustment pin on the rotor core, which requires extra processing steps.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a coreless motor that can easily adjust the balance of a rotor without requiring processing.

  In order to achieve the above object, a first aspect of the present invention provides a cup-type rotor having a cylindrical coil, a stator composed of a permanent magnet fixed inside the rotor, and the stator. And a coreless motor having a housing for housing the rotor, an annular member having a fitting portion of a U-shaped, U-shaped or L-shaped concave portion in a cross section and a convex portion as a balance weight is opened to the coil. It is characterized by being fitted to the edge of the end.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the annular member is fitted to the peripheral edge of the open end of the coil and bonded with a thermosetting adhesive.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the annular member is made of a nonmagnetic material.

  According to the first aspect of the present invention, the annular member is fitted to the peripheral edge of the open end of the existing coil so that the convex portion as the balance weight is located at the unbalanced portion of the rotor, so that any processing is performed on the rotor. The balance of the rotor can be easily adjusted without applying the balance, and the balance weight does not fall off during rotation. In addition, by fitting the annular member to the open end periphery of the coil, the open end periphery of the coil is reinforced by the annular member, so that deformation of the open end portion of the coil is prevented and the rotor can be rotated stably. It becomes. Furthermore, after fitting the fitting part formed as a U-shaped, U-shaped or L-shaped concave part in the annular member into the peripheral edge of the open end of the coil and fixing the annular member to the coil, By rotating it, the position of the convex portion as the balance weight can be easily adjusted.

  According to the second aspect of the present invention, the annular member is clamped to the open end periphery of the coil and bonded with the thermosetting adhesive, so that the annular member is more reliably dropped by the rotating centrifugal force. In addition to being prevented, the position of the convex portion as the balance weight of the annular member can be easily adjusted before bonding.

  According to the third aspect of the present invention, since the annular member is made of a nonmagnetic material, the magnetic field generated in the coil is not affected by the annular member, and the rotor can be stably rotated.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a half sectional view of a coreless motor according to the present invention, FIG. 2 is a side sectional view of a rotor of the coreless motor, and FIG. 3 is a view in the direction of arrow A in FIG.

  As shown in FIG. 1, the coreless motor 1 according to the present invention includes a cup-type rotor 2, a stator 3 made of a permanent magnet fixed inside the rotor 2, and these rotors 2. A housing 4 for housing the stator 3 is provided.

  As shown in FIG. 2, the rotor 2 includes a cylindrical coil 5 formed by winding a conducting wire, and a disk-like shape fitted on the inner periphery of one end (right end in FIG. 2) in the axial direction of the coil 5. The support plate 6 includes a rotation shaft 7 inserted and supported at the center of the support plate 6, and a commutator piece (commutator) 8 attached to the support plate 6. 5 is electrically connected via a tap (not shown).

  As shown in FIG. 1, a brush base 9 is fitted on the inner periphery of one end of the housing 4 in the longitudinal direction (the right end in FIG. 1), and the commutator is disposed on the inner peripheral portion of the brush base 9. A brush 10 that contacts the piece 8 is held. A plurality of terminals 11 extend from the brush 10, and these terminals 11 are connected to a power source (not shown). In addition, you may comprise the terminal 11 with a lead wire.

  Further, a bearing housing 12 is attached to the other longitudinal end of the housing 4 (the left end in FIG. 1), and two bearings 13 and 14 are held in the bearing housing 12 at appropriate intervals in the axial direction. ing.

  Thus, in the coreless motor 1, the rotor 2 is rotatably accommodated in the housing 4, and the stator 3 is fixed inside thereof, but the rotating shaft 7 of the rotor 2 is a bearing housing. 12 is rotatably supported by the bearings 13 and 14 held by the motor 12.

  In the coreless motor 1 configured as described above, when the coil 5 of the rotor 2 is energized from the power source (not shown) through the terminal 11, the brush 10, the commutator piece 8, and the tap (not shown), The rotor 2 is rotationally driven at a predetermined speed by the generated magnetic force and the magnetic force of the stator 3.

  By the way, when the rotor 2 is unbalanced, vibration and noise are generated by the rotation of the rotor 2, and the stable operation of the coreless motor 1 becomes impossible.

  Therefore, in the present embodiment, the annular member 15 provided with the fitting portion 15a as a concave portion having a U-shaped cross section and the convex portion 15b as a balance weight is fitted to the periphery of the open end of the coil 5. In the present embodiment, as shown in FIG. 3, the convex portion 15 b is integrally projected at one place on the inner peripheral surface of the annular member 15.

  Thus, the unbalance position and the unbalance amount of the rotor 2 are measured by a balance measuring device (not shown), and the annular member 15 having the convex portion 15b having a size (mass) corresponding to the measured unbalance amount is obtained. After being fitted to the open end periphery of the coil 5, the annular member 15 is rotated on the coil 5, and the convex portion 15 b is adjusted to the unbalanced position of the coil 5. A large number of annular members 15 having inner and outer diameters and different masses and sizes of the convex portions 15b are prepared.

  Thus, in the present embodiment, the annular member 15 is sandwiched between the open end periphery of the coil 5 and bonded with a thermosetting adhesive. Specifically, a thermosetting adhesive is applied to the fitting portion 15 a of the annular member 15, the fitting portion 15 a is fitted to the open end periphery of the coil 5, and the annular member 15 is sandwiched between the open end periphery of the coil 5. After wearing, the annular member 15 is moved in the circumferential direction on the coil 5 to adjust the position of the convex portion 15b, and when the position of the convex portion 15b is determined, heat is applied to cure the thermosetting adhesive. The annular member 15 is bonded to the coil 5. When a thermosetting adhesive is used for bonding the annular member 15 in this way, the position of the convex portion 15b as a balance weight of the annular member 15 can be easily adjusted on the coil 5 before the annular member 15 is bonded to the coil 5. Can be done.

  As shown in FIGS. 1 and 2, the annular member 15 is made of a nonmagnetic material. As the nonmagnetic material, a resin material such as POM, PET, or PBT is preferably used. In the present embodiment, the convex portion 15b is protruded at one place on the inner peripheral surface of the annular member 15, but the convex portion 15b is protruded from the outer peripheral surface of the annular member 15 as shown in FIG. Alternatively, as shown in FIG. 4B, the convex portion 15b may protrude from the axial end of the annular member 15, or a plurality of convex portions 15 may protrude from a plurality of locations of the annular member 15. good.

  As described above, in the present embodiment, the fitting portion 15a of the annular member 15 in which the convex portion 15b as the balance weight projects from the inner peripheral surface is fitted into the open end periphery of the coil 5 to thereby form the annular member. Since 15 is fixed, the balance of the rotor 2 can be easily adjusted without performing any processing on the rotor 2, and the annular member 15 does not fall off during the rotation. In particular, in the present embodiment, the annular member 15 is fitted to the periphery of the open end of the coil 5 and is bonded with a thermosetting adhesive, so that the annular member 15 from the coil 5 due to the rotating centrifugal force is rotated. The dropout can be prevented more reliably, and the position of the convex portion 15b as the balance weight of the annular member 15 can be easily adjusted before bonding.

  Further, since the annular member 15 is made of a nonmagnetic material, the magnetic field generated in the coil 5 is not affected by the annular member 15, and the rotor 2 can be stably rotated.

  In the present embodiment, the fitting portion 15a of the annular member 15 is configured as a U-shaped or U-shaped concave portion. However, as shown in FIGS. 5 (a) and 5 (b), the fitting portion 15a is crossed. It is configured as an L-shaped concave surface, and this fitting portion is fitted to the inner peripheral surface of the coil as shown in FIG. 5A or the outer peripheral surface of the coil 5 as shown in FIG. 5B. The annular member 15 may be fitted on the periphery of the open end of the coil 5.

It is a half cut sectional view of the coreless motor concerning the present invention. It is a sectional side view of the rotor of the coreless motor which concerns on this invention. FIG. 3 is a partial view in the direction of arrow A in FIG. 2. (A) is a figure similar to FIG. 3 which shows another form of this invention, (b) is sectional drawing which shows another form of the convex part of an annular member. (A), (b) is sectional drawing which shows another form of the fitting part of an annular member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coreless motor 2 Rotor 3 Stator 4 Housing 5 Coil 6 Support plate 7 Rotating shaft 8 Commutator piece 9 Brush stand 10 Brush 11 Terminal 12 Bearing housing 13, 14 Bearing 15 Annular member 15a Annular member fitting part 15b Annular member Convex part

Claims (3)

In a coreless motor provided with a cup-shaped rotor having a cylindrical coil, a stator made of a permanent magnet fixed inside the rotor, and a housing for housing the stator and the rotor,
A coreless motor, wherein an annular member having a U-shaped, U-shaped or L-shaped concave portion and a convex portion as a balance weight is fitted to the peripheral edge of the open end of the coil.   The coreless motor according to claim 1, wherein the annular member is fitted to a peripheral edge of the open end of the coil and bonded with a thermosetting adhesive.   The coreless motor according to claim 1, wherein the annular member is made of a nonmagnetic material.

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