JPS63283455A - Cylindrical armature winding - Google Patents

Abstract

PURPOSE:To decrease a space for fitting coil end parts and improve radiation properties by bending said coil end parts of a cylindrical winding so that said parts go away from each other, and by sticking each coil end part to a motor case. CONSTITUTION:A rotating shaft 34 is provided with a rotor composed of a yoke 44 and a field magnet 45. An armature is composed of an armature core 40 stuck to the inner surface of a frame 30 and a cylindrical winding 41 inserted into and installed at said core 40. Said cylindrical winding 41 has coil end parts 42, 43, which are bent in the direction for them to go away from each other and then fitted in a motor.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an armature winding of a servo motor, and in particular, to replace the DC servo motor that has been widely used for driving robots and various labor-saving devices. The present invention relates to a cylindrical armature winding (hereinafter abbreviated as cylindrical winding) suitable for the armature of brushless motors, whose application has been increasing recently.

[Conventional technology]

In order to improve the control performance of brushless motors, a smooth armature in which a cylindrical winding is fixed to a smooth gap surface of an armature core has been used.

FIG. 3 shows the process of forming a cylindrical winding to be attached to this smooth armature. First, the conductor is guided diagonally around the outer edge of a guide plate (not shown) and wound spirally at equal pitches, and then spirally wound at equal pitches in the opposite direction from a position shifted by half a pitch to form an element coil. Then, winding is repeated so as to align the element coils to form a spirally wound coil. Next, the spirally wound coil is pressurized and formed into a flat shape. This flat body 13 is then wound around a mandrel 20 to form a cylindrical shape as shown in FIG. 3(a). When forming this into a cylindrical shape, the coil end portions 13a and 13b at both ends protrude, so this coil end portion 1
3a and 13b are overlapped to form a cylindrical winding wire 7 having an outer diameter D1 and a length as shown in FIG. 3(b). When the cylindrical winding 7 is attached to a motor and used, the coil end portions 13a and 13b are unnecessary portions for torque generation.
The problem is how to process a and 13b, and the methods shown in FIGS. 4 to 6 have conventionally been used.

To explain the method shown in FIG. 4, a rotating shaft 6 is rotatably supported via a bearing 5 in a case consisting of a frame 1 and a bracket 2. child is attached. The cylindrical winding 7 is fixed to the inner surface of the armature core 14 so as to correspond to the rotor, and the rotor is inserted into the cylindrical winding 7 with a certain gap. Reference numeral 9 denotes a slit plate attached to the anti-load side of the rotating shaft 6, and the light emitting element 10 and the light receiving cable 11 wired to the frame 1 and the detector cover 8 attached to the outer end surface of the frame 1 can The rotational speed and position of the rotating shaft 6 are detected by detecting the slit. In FIG. 4, the coil end portion 13 of the cylindrical winding 7 is bent outward in the radial direction of the motor and extended toward the armature core 14.
It has a structure in which it is connected to a lead wire 12.

The conventional example shown in FIG. 5 is a coil end portion 13 of a cylindrical winding 7.
extends in the axial direction and is connected to the lead wire 12. Further, in the conventional example shown in FIG. 6, the coil end portion 13 of the cylindrical winding 7 is bent inward in the radial direction, and the lead wire 12 is connected to the motor so that it has a length sufficient to be connected to this bent end. inserted inside.

[Problem that the invention seeks to solve]

However, each conventional method has the following problems.

In the conventional example shown in FIG. 4, since the coil end portion 13 of the cylindrical winding 7 is bent outward, the diameter Do1 of the bent coil end portion 13 becomes larger than the outer diameter Do of the armature core 14. The case size is larger. or,
Since the coil end portions of this bent portion are overlapped as described above, it is twice as thick as the cylindrical winding 7 and difficult to bend.

The conventional example shown in FIG. 5 does not require bending of the coil end portion 13, making it easier to process. However, since the coil end portion 13 extends in the axial direction, the frame 1 also has a dimension of “tt”. As shown, it becomes longer in the axial direction, creating dead space in the internal space of the motor, which is an obstacle to downsizing.

The conventional example shown in FIG. 6 shows the outer diameter of the armature core 14. Both dimensions L12 and L12 of the frame 1 can be made smaller than those shown in FIGS. 4 and 5, but there remains the problem that it is difficult to bend the thick coil end portion 13. A space is required to insert the lead wire 12 from the frame 1, and dead space cannot be eliminated.

Therefore, the present invention makes it easy to bend the coil end part,
Moreover, it is an object of the present invention to provide a cylindrical winding wire that can be miniaturized without creating dead space.

[Means for solving problems]

In order to achieve the above object, the present invention comprises a coil formed by spirally winding a conductor, which is formed into a flat shape, this flat body is wound into a cylindrical shape, and the coil end portions at both ends are overlapped,
In a cylindrical winding that is inserted in the axial direction of the armature core so that the rotor of the brushless motor is inserted therein, the armature core and the rotor are oriented so that the overlapping coil end portions are separated from each other. Each bent coil end portion is attached to the inner surface of the motor case in close contact with the inner surface of the motor case.

[For production]

In the present invention, since the coil end portions are bent in the direction of separation, the thickness of each coil end portion is reduced, the bending process becomes more convenient, and the space for the coil end portions becomes smaller. Further, since the coil end portion is closely attached to the case, heat from the cylindrical winding is efficiently transferred to the case and heat is radiated.

〔Example〕

Embodiments of the present invention will be specifically described below with reference to FIGS. 1 and 2. Brackets 31 and 32 are attached to both ends of a cylindrical frame 30 to form a hollow case. A rotary shaft 34 is rotatably supported by the left and right brackets 31 and 32 via bearings 33,
The left end side of the rotating shaft 34 is pulled out from the bracket 31 and serves as an output end. A rotor consisting of a yoke 44 and a field magnet 45 is attached to the rotating shaft 34, and an armature corresponding to the rotor is attached to the inner surface of the frame 30. The armature consists of an armature core 40 fixed to the inner surface of the frame 30, and a cylindrical winding 41 attached to the core 40 so as to be inserted into the core 40. are inserted with a certain gap. The cylindrical winding 41 is formed by flattening a coil in which a conductor is spirally wound and winding this flat body into a cylindrical shape, and can be formed by the same method as shown in FIG. A description of the molding method will be omitted. The cylindrical winding 41 has coil end portions 42 and 43,
The coil end portions 42 and 43 are bent in a manner that separates them from each other and then installed in the motor. The coil end portion 42 is bent in a so-called double-fold shape so that the coil end portion 42 faces the armature core 40 side, and the coil end portion 43 faces the rotor side. The bent coil end portions 42 and 43 are attached to the bracket 32 on the anti-load side (right side).
It can be attached in close contact with the In order to increase this close contact area, it is preferable that each coil end portion 42, 43 be bent substantially perpendicular to the axial direction. By bending the coil end portions 42 and 43 in the opposite direction in this way,
The coil end portion is half the thickness of the cylindrical winding, making it easy to bend and requiring less installation space.

In this embodiment, the coil end portions 42 and 43 are in close contact with the bracket 32 on the anti-load side (right side) opposite to the output end, so that the detector for detecting the rotational speed and position of the rotating shaft 34 is not connected to the load. It is located on the side. The detector includes a slit plate 35 attached to the rotating shaft 34, a light emitting element 36 attached to the load side bracket 31 so as to sandwich the slit plate 35, and a light receiving element attached to a housing plate 39 extending from the frame 30 into the case. A terminal 38 connected to the light receiving element 37 is drawn out from the frame 30.

The cylindrical winding 41 is fixed by molding a heat conductive resin 46, and the resin 46 brings the coil end portions 42 and 43 into good contact with the bracket 32. Therefore, the heat generated from the cylindrical winding 41 is well transferred to the frame 1 and the bracket 32 via the heat conductive resin 46, and is emitted from the frame 1 and the bracket 32 to the outside as shown by the broken line, so that the heat dissipation is improved. Becomes good. This prevents heat transfer to the load side where the detector is provided, so there is an advantage that the detector operates accurately and stably. Furthermore, it is possible to apply the present invention to office automation equipment where temperature rise has a negative effect on the functionality of the equipment, and it is also possible to output high torque. In the figure, 48 is a slit formed between the frame 1 and the bracket 32, one coil end portion 42 of the cylindrical winding 41 is inserted into the slit 48, and the connector is inserted from the end of the coil end portion 42. 47 is drawn out. Therefore, the connection work between the coil end portion 42 and the connector 47 is facilitated, and
The lead wire also has the advantage of being shorter.

Note that the present invention is not limited to the above-mentioned embodiments, and various modifications can be made. The coil end portions at both ends of the cylindrical winding need only be in close contact with the bracket, and if this close contact is possible due to the structure, there is no need to mold the heat conductive resin. Further, no particular space is required for inserting one coil end portion.

〔Effect of the invention〕

As described above, according to the present invention, the coil end portions of the cylindrical winding are bent so as to separate from each other, and each coil end portion is tightly attached to the motor case, so that the bending process becomes easy. This has the effect of reducing the installation space for the coil end and improving heat dissipation.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of one embodiment of the present invention, and Fig. 2 is a vertical cross-sectional view of an embodiment of the present invention.
3(a) and 3(b) are perspective views showing the forming process of a cylindrical winding, and FIGS. 4, 5, and 6 are sectional views of a conventional example. 30... Frame (case), 31.32... Bracket (case), 44... Yoke (rotor), 45... Field magnet (rotor), 40... Armature core, 41...Cylindrical winding, 42.4
3... Coil end portion, 46... Heat conductive resin, 48... Slit.

Claims (1)

[Claims] 1. A coil made of a spirally wound conductor is formed into a flat shape, this flat body is wound into a cylindrical shape, and the coil end portions at both ends are overlapped to form a rotor of a brushless motor. In the cylindrical winding to be inserted, each coil end portion bent toward the armature core and the rotor is tightly attached to the inner surface of the case of the motor so that the coil end portions to be overlapped are separated from each other. A cylindrical armature winding characterized in that it is attached. 2. The cylindrical armature winding according to claim 1, wherein the cylindrical winding is attached to the inner surface of the case by a heat conductive resin mold. 3. The cylindrical armature according to claim 1 or 2, wherein a slit is formed in the radial direction of the slit, and a coil end portion bent toward the armature core is inserted into the slit. winding.