JPH0232874B2 - - Google Patents

Description

Detailed Description of the Invention [Technical Field] The present invention relates to a coreless motor, particularly a rotor in which a cylindrical coil is supported by adhesively fixing the inner circumferential surface of the coil to the outer circumferential surface of a support base fixed to a rotating shaft. This relates to the coreless motor that is included.

[Background technology]

In a coreless motor having a cylindrical coil as described above, in order to maintain an accurate magnetic gap between the coil and the permanent magnet of the stator, the assembly precision of the support base and the coil must be high.
For this purpose, it is preferable to make the inner diameter of the coil and the outer diameter of the support base as equal as possible. If the amount of agent is even slightly large, the excess will flow toward the commutator. In addition, in order to prevent this, if the dimensional difference between the inner diameter of the coil and the outer diameter of the support base is increased and a gap is provided between the two, there will be a problem that the coil will be tilted with respect to the rotating shaft and the support base. Ta.

[Purpose of the invention]

The present invention has been made in view of these points, and its purpose is to provide a coreless motor in which the adhesive does not overflow from the adhesive surface and the cylindrical coil does not tilt. be.

[Disclosure of the invention]

Therefore, in the present invention, the inner circumferential surface of a cylindrical coil is adhesively fixed to the outer circumferential surface of a support base fixed to a rotating shaft on which a commutator is provided, and the coreless commutator supporting the coil is positioned between the coils and the coreless commutator. At least the outer circumferential surfaces of both ends in the axial direction are support surfaces having an outer diameter approximately equal to the inner diameter of the coil, and the outer circumferential surface of the central portion in the axial direction is for storing adhesive. The recess is characterized in that the recess is open on one side of the commutator side of the support and between the segments of the commutator, so that excess adhesive flows into the recess. This prevents the adhesive from overflowing to the outside of the commutator, and prevents the coil from tilting due to the presence of the supporting surface.The recess is also positioned between the segments of the commutator, so that the recess is located between the segments of the commutator. This is so that it does not interfere with the connection between the coil and the winding wire.

The present invention will be described in detail below based on the illustrated embodiment. In the figure, 1 is a rotor, 2 is a stator, 3 is a yoke, and 4 is a rotating shaft. The cylindrical yoke 3 has a substrate 30 fixed to one end. A stator 2 and a rotor 1 are housed inside. Stator 2 is yoke 3
A cylindrical permanent magnet 5 is attached thereto, and the rotating shaft 4 is supported by a pair of bearings 15. The rotor 1 provided on the rotating shaft 4 is composed of a substantially disc-shaped support 6 fixed to the rotating shaft 4, a cylindrical coil 9, and a commutator 7, and the commutator 7 further includes a base 10. and segment 11.

The base 10 of the commutator 7 has a plurality of protrusions 13 on its lower surface, and the hook portions 12 of the segments 11 protrude from the outer peripheral surface. The support base 6 has a circular concave surface 21 on its top surface into which the lower part of the commutator 7 fits, and a hole 22 formed in the bottom surface of this concave surface 21, and has a plurality of protrusions 23 on the periphery of the top surface. The surface is provided with a plurality of recesses 24 at intervals in the circumferential direction. This recess 24 also opens on the upper surface of the support base 6. The outer diameter of the support base 6 on the outer peripheral surface without the recess 24 is approximately equal to the inner diameter of the coil 9. The support base 6 and the commutator 7 are assembled with an insulating plate 8 disposed between them, and the lower part of the base 10 of the commutator 7 has a concave surface 21.
By fitting the protrusion 13 into the hole 22, the two are positioned and connected to each other, and the insulating plate 8 located between the hook portion 12 of the segment 11 and the support base 6 is formed on the outer peripheral edge thereof. When the plurality of notches 18 engaged with the protrusions 23, the insulating plate 8
is positioned relative to the support base 6 and assembled. In the support base 6, commutator 7, and insulating plate 8 assembled in this way, each recess 24 is located between the hook parts 12 of each segment 11, and the insulating plate 8 is placed below each hook part 12. The part of the support base 6 without the recess 24 is located there. The coil 9 is wound after these members are assembled to the rotating shaft 4, and the coil 9 is wound while hooking the wire to the hook portion 12 of the segment 11 of the commutator 7 during winding on the car. be. When the winding is completed, the hook portion 12 of the segment 11 is bent and the wire is inserted. 14 in the figure is a hooking part for the line. Next, a welding electrode is applied from above the bent portion of the hook portion 12 to weld the segment 11 and the wire, and the heat during welding melts the wire coating to establish an electrical connection between the segment 11 and the coil 9. In order to prevent the insulating plate 8 from being destroyed by the heat generated at this time, the insulating plate 8 is made of a material that has not only insulating properties but also heat resistance. Further, as described above, since the recess 24 is located between the segments 11, the presence of the recess 24 is caused by the segment 11 and the coil 9.
It does not get in the way of connection with the line.

Once the electrical connection between the commutator 7 and the coil 9 is completed,
The coil 9 is adhesively fixed to the support base 6, and this is done by filling the entire circumference between the support base 6, the outer peripheral surface, and the inner peripheral surface of the coil 9 with adhesive.
At this time, even if the amount of adhesive is large, the excess adhesive flows into the recess 24 and does not flow onto the upper surface of the support base 6. Further, the adhesive that has flowed deeply into the recess 24 ensures sufficient mechanical connection strength between the support base 6 and the coil 9. Inclination of the coil 9 with respect to the rotating shaft 4 is prevented by fitting the coil 9 to the support surface 25, which is the outer circumferential surface of the support base 6 without the recess 24. Furthermore, the support surface 25 extending over the entire circumference at the lower part of the outer peripheral surface of the support base 6 prevents the adhesive from flowing down to the lower inner surface of the coil 9. Note that the recess 24 may be open on both the upper and lower sides of the support base 6.

Next, the support structure of the printed circuit board 32 by the board 30 will be described. The printed board 32 here has a rectifier circuit mounted thereon, and is attached to a plurality of ribs 31 protruding from the board 30 made of insulating synthetic resin. In other words, rib 3
1 is fitted into the printed circuit board 32, and as is clear from FIG. When the printed board 32 is attached to the board 30, the ribs 31 cross between the through holes 33. The ribs 31 increase the insulation distance between the through holes 33. In the figure, numeral 34 indicates a conductive pattern portion, and numeral 35 indicates a soldering portion.

〔Effect of the invention〕

As described above, in the present invention, a support surface having an outer diameter approximately equal to the inner diameter of the coil and a recess are provided on the outer peripheral surface of the support base, and the inclination of the coil is determined by the fit of the coil on the support surface. The flow of excess adhesive is prevented by the concave portion, and the axially central portion of the support base has an engaging portion for mutual positioning between the commutator and the commutator. The adhesive storage recess provided on the outer circumferential surface is open on one side of the support base on the commutator side and between the commutator segments, so that the commutator segments and the coil windings are not connected to each other. When making a connection, the adhesive that has accumulated in the recess will not interfere with the above connection, and the welding electrode can be pressed against the segment and the winding to connect it. This can be done reliably by using the surface, and although it is easy to control the flow of adhesive by providing a recess so that the recess opens to the surface on the commutator side. , the presence of this recess does not interfere with the connection between the commutator segments and the coil windings.

[Brief explanation of drawings]

Figure 1 is a sectional view of an embodiment of the present invention, Figure 2 is an exploded perspective view of the same rotor, Figures 3 a and b are a plan view and sectional view of the same rotor, and Figure 4 is the same as in Figure 1. XX sectional view of , 1 is a rotor, 6 is a support stand,
7 is a commutator, 8 is an insulating plate, 9 is a coil, 11 is a segment, and 24 is a recess.

Claims (1)

[Claims] 1. A coreless motor in which a cylindrical coil is supported by adhesively fixing the inner circumferential surface of the coil to the outer circumferential surface of a support base fixed to a rotating shaft on which a commutator is provided,
The support base having an engaging portion for mutual positioning with the commutator has at least an outer circumferential surface at both ends in the axial direction serving as a support surface having an outer diameter approximately equal to the inner diameter of the coil, and a center portion in the axial direction. A coreless motor comprising a recess for storing an adhesive on an outer circumferential surface of the motor, the recess being open on one surface of the support base on the commutator side and between the segments of the commutator. 2. The coreless motor according to claim 1, wherein a plurality of recesses are provided on the outer peripheral surface of the support base at intervals in the circumferential direction.