JP3801416B2 - Rotating electric machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotating electrical machine suitable for use in an ultra-small rotary solenoid, a motor, or the like.
[0002]
[Prior art]
Conventionally, a rotary solenoid that rotates and displaces a magnet rotor over a predetermined angular range is known, for example, in Japanese Patent Laid-Open No. 10-336930.
[0003]
This type of rotary solenoid includes a magnet rotor having a magnet in the middle portion of the shaft, and a stator in which a coil is wound around a coil bobbin having an iron core (yoke). By exciting or de-energizing the coil, the magnet rotor Can be rotationally displaced over a predetermined angular range. Note that the rotation angle range of the magnet rotor can be set by a pair of front and rear stoppers that restrict the action member attached to the shaft.
[0004]
[Problems to be solved by the invention]
However, the conventional rotary solenoid (rotating electric machine) described above has the following problems.
[0005]
First, since the magnet rotor is housed in the inner space of the coil bobbin formed in a ring shape, the diameter of the inner space is larger than the outermost diameter of the magnet rotor, and the coil housing space (the number of coil turns) is limited. In addition, there is a limit to downsizing and downsizing.
[0006]
Secondly, the core part having a complicated shape formed of a magnetic material is required on the iron core part, resulting in an increase in overall cost including parts cost and manufacturing cost.
[0007]
Third, since it is not easy to improve the coaxiality of the magnet rotor with respect to the stator (iron core portion), variations in characteristics and quality are likely to occur.
[0008]
The present invention solves such problems existing in the prior art, and can effectively reduce the size and size (ultra-miniaturization) by efficiently securing the coil housing space, and further reduce the overall cost. An object of the present invention is to provide a rotating electrical machine capable of improving the uniformity of characteristics and quality.
[0009]
[Means for Solving the Problems and Embodiments]
The present invention constitutes a rotating electrical machine 1 (rotary solenoid 1s) including a magnet rotor 2 having a magnet 4 at an intermediate portion of a shaft 3 and a stator 5 in which coils 8i and 8j are wound around a coil bobbin 7 covering an iron core portion 6. In this case, the coil bobbin 7 is constructed by mounting and facing the shaft 3 from both sides, and the coil winding portions 9pi, 9pj, 9qi, 9qj for winding the coils 8i, 8j are provided on the outer peripheral surface 4f of the magnet 4. It is characterized by comprising a pair of bobbin half parts 7p, 7q having a shape that overlaps more radially toward the center side, and an iron core part 6 mounted between the pair of bobbin half parts 7p, 7q.
[0010]
In this case, according to a preferred embodiment, the iron core portion 6 is formed by bending the plate member P, so that the magnetic pole portions 11i, 11j facing the outer peripheral surface 4f of the magnet 4 and the magnetic pole portions 11i, 11j. A plurality of core split parts 6i, 6j provided integrally with core body parts 12i, 12j projecting radially outward from the intermediate part can be provided. Also, the bobbin half portions 7p and 7q are engaged with bearing engaging portions 13p and 13q with which the bearings 20p and 20q supporting the shaft 4 are engaged, and an iron core engaging portion 14pi with which the end of the iron core portion 6 is engaged. , 14pj, 14qi, 14qj.
[0011]
Thereby, the bobbin half parts 7p and 7q are mounted on the shaft 3 of the magnet rotor 2 from both sides to constitute the coil bobbin 7, and therefore the coil winding parts 9pi, 9pj, 9qi, and 9qj which are part of the coil bobbin 7 are provided. The magnet 4 can be overlapped more radially than the outer peripheral surface 4f of the magnet 4, so that the dead space between the coil bobbin 7 and the shaft 3 can be used effectively for the coil housing space. Moreover, since the iron core part 6 uses the iron core division | segmentation part 6i ... which bent the plate member P ..., while being able to implement at low cost, furthermore, the bearing which supports the shaft 3 to the bobbin half body part 7p ... If the bearing engaging part 13p ... with which 20p ... engages and the iron core engaging part 14pi, 14pj ... with which the edge part of the iron core part 6 (iron core division | segmentation part 6i ...) engages is provided, it will be with respect to the magnet rotor 2. The bobbin half part 7p (coil bobbin 7) and the iron core split part 6i (iron core part 6) can be positioned easily and accurately, and their coaxiality can be improved.
[0012]
【Example】
Next, preferred embodiments according to the present invention will be given and described in detail with reference to the drawings.
[0013]
First, the configuration of an ultra-small rotary solenoid 1s (rotating electrical machine 1) according to the present embodiment will be described with reference to FIGS.
[0014]
First, components used for the rotary solenoid 1s will be described. Reference numeral 2 denotes a magnet rotor, which is configured by attaching a magnet 4 magnetized in the circumferential direction to two poles in the middle portion of the shaft 3.
[0015]
Reference numerals 7p and 7q denote a pair of half bobbin portions that constitute the coil bobbin 7 by being mounted on both sides of the shaft 3 of the magnet rotor 2 and facing each other. One bobbin half 7p includes a bearing engaging portion 13p to which a bearing 20p supporting the shaft 3 is engaged (fitted), coil winding portions 9pi and 9pj for winding the coils 8i and 8j, and an iron core. Iron core engaging portions 14pi, 14pj with which the ends of the divided portions 6i, 6j are engaged (fitted) are provided. In this case, the bearing engaging portion 13p has an engaging hole portion 21p and a pair of engaging concave portions 22p arranged in an axial symmetry. In addition, when mounted on the shaft 3, the coil winding portions 9pi, 9pj overlap with the outer peripheral surface 4f of the magnet 4 in the radial direction center side, preferably as shown in FIG. 1 (FIG. 4), The coil housing space in the coil winding portions 9pi and 9pj is formed in a shape that enters the center in the radial direction from the outer peripheral surface 4f of the magnet 4. Thereby, the dead space between the bobbin half part 7p and the shaft 3 can be effectively used for the coil housing space. Furthermore, the ring-shaped protrusion 15p shown in FIG. 5 (refer FIG. 7) is formed in the contact surface (interference surface) with respect to the magnet 4. FIG. Thereby, the contact area between the magnet 4 and the bobbin half part 7p becomes small, and the smooth rotation of the magnet rotor 2 is ensured. The other bobbin half 7q is the same as the bobbin half 7p. In the bobbin half part 7q, 13q is a bearing engaging part, 9qi and 9qj are coil winding parts, 14qi and 14qj are iron core engaging parts, 21q is an engaging hole part, 22q. Each section is shown.
[0016]
Reference numerals 20p and 20q denote bearings which are integrally formed of a low friction coefficient material. One bearing 20p has a cylindrical bearing body 25p that engages with the engagement hole 21p, and positioning portions 26p that engage with the engagement recesses 22p. The other bearing 20q is the same as the bearing 20p. In the bearing 20q, 25q indicates a bearing main body, and 26q.
[0017]
6 is an iron core part, and is provided with two iron core division parts 6i and 6j. The iron core dividing portions 6i and 6j are the same, and the iron core dividing portion 6i (6j) is formed by bending a plate member P ... having a certain thickness as shown in FIG. A magnetic pole part 11i (11j) facing the outer peripheral surface 4f and a core body part 12i (12j) projecting radially outward from an intermediate part of the magnetic pole part 11i (11j) are integrally provided.
[0018]
Further, 31 is a cylindrical outer case, 32 is a front cover portion that closes the front end of the outer case 31, and 36 is a rear cover portion that closes the rear end of the outer case 31. In this case, the front cover portion 32 has an insertion hole 33 into which the bearing 20p is inserted at the center, and mounting screw holes 34 and 35 on both sides of the insertion hole 33. The rear cover portion 36 has an insertion hole 37 into which the bearing 20q is inserted at the center, and lead wire insertion holes 38 and 39 on both sides of the insertion hole 37.
[0019]
Next, a method for assembling the rotary solenoid 1s according to the present embodiment will be described with reference to the drawings.
[0020]
First, a magnet rotor 2 having a magnet 4 attached to an intermediate portion of the shaft 3 is prepared. And the bobbin half part 7p and 7q are each mounted | worn with respect to the shaft 3 of this magnet rotor 2 from both sides. At this time, each of the bobbin half parts 7p and 7q makes the iron core engaging parts 14pi ... and 14qi ... face each other, and the iron core split parts 6i and 6j are interposed between the bobbin half parts 7p and 7q. In this case, as shown in FIG. 2, both ends of the iron core split part 6i are fitted to the iron core engaging parts 14pi and 14qi, respectively, and both ends of the iron core split part 6j are connected to the iron core engaging parts 14pj and 14qj. Fit each one. Thereby, the bobbin half parts 7p and 7q and the iron core division | segmentation parts 6i and 6j are each positioned in the circumferential direction, radial direction, and an axial direction. The opposing surfaces of the bobbin half parts 7p and 7q are brought into contact with each other.
[0021]
Next, the coil 8i is wound around the coil winding portion 9pi of the coil bobbin 7 and the coil 8j is wound around the coil winding portion 9pj by the wire that is set in the automatic winding machine in this state and fed out. When the winding process of the coils 8i and 8j is completed, the lead wire 41 is connected to the wire start end derived from the coil 8i, and the lead wire 42 is connected to the wire end derived from the coil 8j.
[0022]
On the other hand, a front cover portion 32 into which the bearing 20p is press-fitted (inserted) is prepared, and one end (front side) of the shaft 3 is inserted into the bearing 20p, and the coil bobbin 7 side is accommodated in the prepared outer case 31. Then, the front cover portion 32 is press-fitted into one end portion of the outer case 31. Further, after the bearing 20q is press-fitted (inserted), a cover portion 36 is prepared, the other end (rear side) of the shaft 3 is inserted into the bearing 20q, and the lead wires 41 and 42 are inserted into the insertion holes 38 and 39, respectively. After the insertion, the rear cover portion 36 is press-fitted into the other end portion of the outer case 31.
[0023]
The assembly of the rotary solenoid 1s is completed by the above assembly process. The basic principle of the rotary solenoid 1s according to this embodiment is the same as that of a known two-pole rotary solenoid. Therefore, for example, when the working member is attached to the shaft 3 and a rotation angle range is set by providing a pair of front and rear stoppers for regulating the working member, the working member is controlled by performing energization control on the rotary solenoid 1s. It can be selectively rotated and displaced to the first position and the second position.
[0024]
As described above, the rotary solenoid 1s according to this embodiment is mounted on both sides of the shaft 3 and opposed to form the coil bobbin 7, and the coil winding portions 9pi and 9pj for winding the coils 8i and 8j. , 9qi, 9qj are used as a pair of bobbin half portions 7p, 7q having a shape in which the outer peripheral surface 4f of the magnet 4 is overlapped in the radial direction center side, so that a dead space between the coil bobbin 7 and the shaft 3 is used as a coil housing space. Therefore, effective use (efficiency use) can be achieved, miniaturization and miniaturization (ultra miniaturization) can be achieved, and high performance can be achieved by increasing the number of turns of the coils 8i and 8j. Moreover, since the iron core part 6 is comprised by the two iron core division | segmentation parts 6i and 6j which bent the plate member P ..., the iron core part 6 can be obtained easily and at low cost. Further, the bobbin half portions 7p and 7q are provided with bearing engaging portions 13p and 13q with which the bearings 20p and 20q are engaged, and iron core engaging portions 14pi, 14pj, 14qi and 14qj with which the iron core portion 6 is engaged. Therefore, the bobbin half part 7p (coil bobbin 7) and the iron core split part 6i (iron core part 6) can be easily and accurately positioned with respect to the magnet rotor 2, thereby enhancing the coaxiality thereof. And uniformity of characteristics and quality can be improved.
[0025]
The embodiment has been described in detail above, but the present invention is not limited to such an embodiment, and the detailed configuration, shape, material, quantity, and the like are arbitrarily set within the scope of the present invention. Can be changed, added or deleted. For example, although the rotary solenoid 1s is illustrated as the rotating electrical machine 1, it can be similarly applied to a motor or the like. Further, although the two-pole rotary solenoid 1s is illustrated, the present invention can be implemented with any number of poles.
[0026]
【The invention's effect】
As described above, the rotating electrical machine according to the present invention constitutes a coil bobbin by being attached to and opposed from the shaft, and the coil winding part for winding the coil is more than the outer peripheral surface of the magnet in the magnet rotor. Since a pair of bobbin halves having a shape overlapping the radial center side and an iron core portion mounted between the pair of bobbin halves are provided, the following remarkable effects are achieved.
[0027]
(1) The dead space between the coil bobbin and the shaft can be effectively utilized (efficient utilization) for the coil housing space. Therefore, it is possible to realize a small and compact size (ultra-miniaturization) and to increase the performance by increasing the number of turns of the coil.
[0028]
(2) According to a preferred embodiment, if the iron core part is constituted by a plurality of iron core split parts formed by bending the plate member, the iron core part can be obtained easily and at low cost. Cost can be reduced.
[0029]
(3) According to a preferred embodiment, if a bobbin half is provided with a bearing engaging portion that engages a bearing that supports the shaft and an iron core engaging portion that engages an end of the iron core portion, The bobbin half part and the iron core split part can be easily and accurately positioned with respect to the magnet rotor, and the coaxiality of these parts can be improved, thereby improving the uniformity of characteristics and quality.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a rotary solenoid according to a preferred embodiment of the present invention;
FIG. 2 is a front sectional view of the rotary solenoid;
FIG. 3 is a plan sectional view of the rotary solenoid;
FIG. 4 is a partially sectional exploded view showing components of the rotary solenoid;
FIG. 5 is a front view of a half bobbin portion of the rotary solenoid;
FIG. 6 is a rear view of a half bobbin portion of the rotary solenoid;
FIG. 7 is a partially cutaway side view of a half bobbin portion of the rotary solenoid;
FIG. 8 is a front view of an iron core dividing portion in the rotary solenoid;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotating electrical machine 1s Rotary solenoid 2 Magnet rotor 3 Shaft 4 Magnet 4f Magnet outer peripheral surface 5 Stator 6 Iron core part 6i Iron core split part 6j Iron core split part 7 Coil bobbin 7p Bobbin half part 7q Bobbin half part 8i Coil 8j Coil 9pi Coil winding portion 9pj Coil winding portion 9qi Coil winding portion 9qj Coil winding portion 11i Magnetic pole portion 11j Magnetic pole portion 12i Core main body portion 12j Core main body portion 13p Bearing engagement portion 13q Bearing engagement portion 14pi Iron core engagement portion 14pj Iron core engaging portion 14qi Iron core engaging portion 14qj Iron core engaging portion 20p Bearing 20q Bearing P ... Plate member

Claims (4)

In a rotating electrical machine comprising a magnet rotor having a magnet in the middle part of a shaft and a stator having a coil wound around a coil bobbin covering an iron core part, the coil bobbin is configured by mounting from both sides and facing the shaft. A pair of bobbin halves having a shape in which a coil winding part for winding a coil overlaps the center side in the radial direction from the outer peripheral surface of the magnet, and an iron core part mounted between the pair of bobbin halves A rotating electric machine comprising: The iron core portion is formed by bending a plate member so that a magnetic pole portion facing the outer peripheral surface of the magnet and a core main body portion protruding radially outward from an intermediate portion of the magnetic pole portion are integrally provided. The rotating electrical machine according to claim 1, further comprising an iron core dividing portion. The said bobbin half body part has a bearing engaging part with which the bearing which supports the said shaft engages, and an iron core engaging part with which the edge part of the said iron core part engages. Rotating electric machine. 2. The rotating electrical machine according to claim 1, which is applied to a rotary solenoid.

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