JPH0340488B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] In the present invention, when a pulse is input, the rotor rotates by a certain angle to constrain the rotor's deviation angle, and when the pulse is cut off, the rotor is unconstrained and the rotor is rotated by a certain angle. The present invention relates to an improvement in a rotary solenoid that performs reciprocating rotational movement to return to its original position by applying a restoring force.

[Prior art]

Today, rotary solenoids are widely used as drive sources for driving the printhead needles of printers and other printing devices, the plungers of mini pumps, and the control levers that hit pachinko balls in electric pachinko machines. As shown, magnetic poles 2a and 2b are provided facing each other inside a stator yoke 1 formed into a circular shape, and coils 3a and 3b are wound around these magnetic poles 2a and 2b, and both coils 3a and 3b are connected in series. and the magnetic pole 2a,
A rotor 4 made of a ferrous magnetic material is inserted between the rotor 2b and has salient poles 4a and 4b corresponding to the magnetic poles 2a and 2b on both sides of the flat part, and the rotor 4 is rotatable with a rotation shaft 5 on a bearing. It is supported and configured. In operation, when a pulse is input to the coils 3a and 3b, magnetic flux flows from the stator yoke 1 to the rotor 4, rotating the rotor 4 in the direction of the arrow in FIG. When the arm 6 is moved from 7 to the stopper 8 side and the pulse is cut off, the magnetic flux disappears and the arm 6 returns to the stopper 7 side due to its own weight or a restoring force applied from the outside, returning the rotor 4 to its original position. Note that the rotary solenoid X shown in FIG. 9 has a two-pole structure with two magnetic poles 2a and 2b, so the rotation angle of the rotor 4 is approximately 90°, but the 0° and 90° positions are Since the generated torque is "0", the rotor 4 is first moved by the stoppers 7 and 8 to the position (starting point) where it will be rotated by the generated torque before use. In general, the generated torque in a rotary solenoid whose rotor is made of iron-based magnetic material instead of a permanent magnet is expressed by the following equation.

T=1/2・i ² N ²・∂p(θ)/∂Θ ...(1) Permeance P(θ) P(θ)=P ₀ +P ₁ cosΘ ...(2)

T: generated torque, i: current, N: number of turns P(θ): permeance, P ₀ : constant permeance P ₁ : variable permeance ∂P(θ)/∂Θ: rate of change in permeance. In order to increase the generated torque T, the following three points can be considered.

(a) Increase the ampere turns of the coil.

(b) Increase the diameter and axial dimensions of the rotor while keeping the magnetic flux density constant.

(c) In (a) and (b) above, permeance P(θ)
Maximize the rate of change of. Therefore, the above (a)~
If a rotary solenoid is manufactured with (c) in mind, ideal permeance characteristics can be obtained, as shown by the solid line A in the characteristic diagram showing the rate of change in permeance in FIG. That is, the salient poles 4a, 4b of the rotor 4 and the magnetic poles 2a, 2b of the stator yoke 1
from the position where the rotors 4 and 4 face each other,
As shown in Figure 0, the position rotated by 90 degrees becomes the dead point of the rotor 4 (the position that does not contribute to the rotation of the rotor 4), and the permeance is the minimum (the 7th position).
From this position, the rotor 4 is rotated by a small angle Θ as shown in FIG. 11 (point A in FIG. 7), and the permeance change rate ∂p(θ)/∂Θ As a result, the generated torque T (point A' in FIG. 8) becomes maximum.

[Problems with conventional technology]

However, the rotary solenoid
As shown in FIG. 0, protrusions a and b are provided at the ends of the magnetic poles 2a and 2b to cover the salient poles 4a and 4b of the rotor 4 in order to prevent the coils 3a and 3b from being removed. That is, the protrusions a and b enter inside the reference lines EOD and D'OE' of the rotor rotation angle shown by the dashed line in FIG. 10, and the stator yoke 1 of this structure
Now, as shown by the dotted line B in FIG. 7, the rate of change in permeance (point B in FIG. 7) when the rotor 4 rotates through the angle Θ as shown in FIG. 11 is small.
As shown by dotted line D in the torque characteristic diagram of FIG. 8, the generated torque T (point B' in FIG. 8) becomes small. To explain this more specifically, when the rotor 4 is rotated clockwise by a minute angle Θ from the position shown in FIG. 10 as shown in FIG. 11 (the starting point where the rotor 4 starts rotating), The rotor 4 rotates. In this state, the magnetic poles 2a and 2b of the stator yoke 1
and the salient poles 4a, 4b of the rotor 4 c, e
The magnetic flux φ flowing in the space effectively rotates the rotor 4, but magnetic flux remains in the air holes d and f, and this acts as a torque that rotates the rotor 4 in the opposite direction, so that the entire rotary solenoid The generated torque decreases. That is, the rotor 4 is attached to the magnetic poles 2a and 2b.
Since the protrusions a and b are integrally provided so as to cover the edges of the salient poles 4a and 4b, the rotor 4 moves to a position deviated by an angle Θ from the dead point position, as shown in FIG. However, since magnetic flux remains in the spaces d and f, the rate of change in perceance ∂P(θ)/∂Θ becomes small, and as a result, the effective torque for rotating the rotor 4 decreases. It was difficult to generate this.

In addition, the stator yoke 1 of the conventional rotary solenoid , since the space around the magnetic poles 2a and 2b needs to be enlarged, the rotary solenoid X becomes larger, making it difficult to install these devices in narrow spaces when used as a drive source for electric pachinko, mini pumps, etc. It was hot. Moreover, when winding the coils 3a, 3b around the magnetic poles 2a, 2b, since the stator yoke 1 is circular, the magnetic poles 2a, 2b
Since the top and bottom of 2b are closed, it is difficult to automatically wind the coil, and in addition, after winding, the two divided coils 3a and 3b must be connected, which requires considerable effort and time when manufacturing the rotary solenoid X. This was a major factor hindering mass production.

[Purpose of the invention]

The present invention eliminates the above-mentioned drawbacks and provides a rotary solenoid that has a simple structure, can generate a large torque, is easy to manufacture, does not need to be particularly large, and can be easily installed in a narrow space of equipment. It's about doing.

[Summary of the invention]

In the present invention, a coil is wound around the bridging part of the stator yoke formed in a U-shape, and inside one end of the magnetic path on both sides of the stator yoke, there are arc-shaped magnetic poles having sharp protruding edges that facilitate convergence of magnetic flux. , and a rotor having salient poles corresponding to the magnetic poles is inserted between the magnetic poles so that the salient edges and the protruding ridges of the magnetic poles are aligned diagonally with each other. do.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 8.

In FIG. 1, reference numeral 11 denotes a stator yoke made by punching an electromagnetic steel plate such as a silicon steel plate into a substantially U-shape, stacking a suitable number of these and fixing them with rivets 12. Parallel magnetic path pieces 11c, 11c' on both sides of the stator yoke A bridge part 11a for installing the coil is provided on the upper part of the magnetic path piece 11c,
An arc-shaped magnetic pole 11 is placed on the inner surface of the lower end of 11c'.
b and 11b' are formed to face each other, and the edges of the arcuate portions of the magnetic poles 11b and 11b' have sharp protruding ridges that meet at diagonal positions, as shown by the dashed line in FIG. g, h, j, and k are provided integrally. Among these ridges, g and k are the magnetic poles 11
It is formed by providing notches 11d, 11d' inside the magnetic path pieces 11c, 11c' on the upper edge of b, 11b',
The protruding edges h and j are formed by cutting the lower edges of the magnetic poles 11b and 11b' at acute angles. Reference numeral 13 denotes a coil attached to the bridge portion 11a of the stator yoke 11. As shown in FIG. The joints 14a are held together by fitting and joining, and the joined portions 14a are fixed with adhesive tape or the like. The coil conducting wire is wound around the coil bobbin 14 by attaching the stator yoke 11 to a rotating shaft of a winding machine (not shown) and rotating it together with the coil bobbin 14. At this time, since the lower portions of the magnetic path pieces 11c and 11c' of the stator yoke 11 are open, the coil conductor is wound around the magnetic poles 11b and 11c'.
It can be done quickly and easily without being hindered by 1b'. 1
Reference numeral 5 denotes a rotor made of iron-based magnetic material that is inserted into a rotor insertion hole 16 opened between the magnetic poles 11b and 11b' of the stator yoke 11, and has a flat portion corresponding to the magnetic poles 11b and 11b' of the stator yoke 11. It has two salient poles 15a, 15a' whose upper and lower sides are machined into an arc shape, and these salient poles 15a, 15a' have protrusions on their edges that are aligned with the rotor 15, as shown in FIGS. 3 and 5. When inserted into the insertion hole 16, the ridges g, h, j, k of the magnetic poles 11b, 11b' are formed so as to closely oppose each other with a small space on a diagonal line.
Reference numeral 17 denotes a bracket which has a bearing fitting part 17a in the center that accommodates a bearing 18 that supports the rotating shaft 15c of the rotor 15, and has mounting arms 17b integrally extended on both sides. Rotation axis 15
Insert the bearing 18 into the hole 16 and insert the rotor 15 into the insertion hole 16.
Then, while housing the bearing 18 in the bearing fitting portion 17a of the bracket 17 from both sides of the rotor 15, insert the bracket 17 into the stator yoke 11.
When the bracket 17 is tightened by passing the tightening screw 19 from one bracket through the stator yoke 11 and screwing it into the other bracket,
As mentioned above, the rotor 15 has salient poles 15a, 15
The protrusion on the edge of a′ is connected to the magnetic poles 11b and
The electrical center position of the rotor insertion hole 16 is determined by making the air space narrow at diagonal positions with the projecting ridges g, h, j, and k of 1b' and facing each other so that the magnetic flux can easily converge in each air area. Can be installed on.

Next, to explain the operation, in FIG. 3, when the coil 13 is energized, the coil 13 is excited and magnetic flux flows to the stator yoke 11.
Since the rotor 15 is located at the dead point, each ridge g, h, j, k of the magnetic poles 11b, 11b'
Since the permeance in each space between the rotor 15 and the space at the end edge of the salient poles 15a, 15a' of the rotor 15 is minimized, the rotor 15 does not rotate. Therefore, as shown in FIG. 4, the starting position is usually a point where the rotor 15 is moved from the dead point position by a small angle Θ clockwise or to the opposite side (clockwise in this embodiment). When the coil 13 is energized in this state, the rotor 15 rotates clockwise in FIG. 4. At this time, the magnetic flux φ flowing through the stator yoke 11 is transmitted from the ridge g of the magnetic pole 11b' on the magnetic path piece 11c' side to the rotor 15, as shown by the solid line in FIG.
, and flows to the magnetic path piece 11c side via a protruding ridge j diagonally corresponding to the protruding ridge g. On the other hand, the magnetic path piece 11
As the rotor 15 rotates, the magnetic flux flowing toward the ridge h side along the lower part of c′ and the magnetic flux flowing inside the rotor 15 toward the ridge k side of the magnetic pole 11b (indicated by dotted lines in FIG. 4) , the air space between the protruding ridge h and the edge of the salient pole 15a' and the edge of the protruding ridge 15a is gradually expanded, and the magnetic resistance in the air area increases, making it difficult for magnetic flux to flow. Therefore, the magnetic flux flowing through the empty portion is significantly reduced. For this reason, the ridge h,
Since almost no magnetic flux flows in the vicinity of k, most of the magnetic flux φ flows from the ridge g of the magnetic pole 11b' to the rotor 15 to the ridge j of the magnetic pole 11b, which attempts to rotate the rotor 15 in the opposite direction. Torque (reverse torque)
is hardly generated, and the rotor 15 rotates clockwise in FIG. 4 with a large generated torque. In addition, notches 11d and 1
1d', the magnetic flux flowing from this part, that is, from the notch 11d' to the upper end of the rotor 15 to the notch 11d (shown by the dashed line in FIG. 4), is
As a result of increasing magnetic resistance at positions 1d and 11d',
It becomes difficult to flow.

In this way, the rotary solenoid Y of the present invention
Since most of the magnetic flux flowing through the stator yoke 11 can be used as magnetic flux contributing to the rotation of the rotor 15, the torque generated by the rotor 15 can be inevitably increased. As shown in FIG. 7, when the rotor 15 rotates by a small angle Θ, the rate of change in permeance can be brought close to the maximum as shown at point A in the figure.
The generated torque at this time is the largest, as shown by A' in FIG. This is because, as described above, most of the magnetic flux flowing through the stator yoke 11 acts as an effective magnetic flux that contributes to the rotation of the rotor 15.

Next, Fig. 6 shows the rotary solenoid Y of the present invention.
This is an example in which the rotary solenoid Y is implemented in a ball hitting device of an electric pachinko machine, for example.
1 is screwed onto the support nut 22 of the stator yoke 11 to be attached to the mounting board 20, and the operating rod 23 is fixedly attached to the rotating shaft 15c. In addition, a stopper 2 that restricts the rotation range of the operation rod 23 in the middle of the rotation locus of the operation rod 23, that is, in the rotation range.
4 and 25 are attached to the mounting board 20 as shown in FIG. And coil 1 of rotary solenoid Y
When the rotor 15 is rotated by energizing the rotor 15, the operating rod 23 moves to the position indicated by the two-dot chain line in FIG.
That is, it rotates to a position where it collides with the stopper 25, and strikes and fires a pachinko ball (not shown). When the operating rod 23 stops energizing the coil 13 after colliding with the stopper 25, it returns to the position where it contacts the stopper 24 due to its own weight. Therefore, by controlling the intermittent time of the current, the number of firings of the operating rod 23 can be arbitrarily adjusted, and by arbitrarily varying the mounting position of the stopper 24, the rotation angle of the rotor 15 of the rotary solenoid Y can be adjusted. Since this can be adjusted, the ball hitting force of the operating rod 23 can be arbitrarily changed along with the increased torque generated.

Although the present invention has been described with reference to an example in which the rotary solenoid Y drives the ball hitting device of an electric pachinko machine, the rotary solenoid Y is not limited to this, and the rotary solenoid Y is
The operating rod 23 that is directly connected to the printer can be used to print characters by connecting it to the print head needle of a printer, or can be used to supply or drain water by connecting it to the plunger of a mini pump, or can be used to connect it to the plunger of a mini pump and use it for supply and drainage work. It may also be used as a drive source for driving the drive device of the handle portion.

〔Effect of the invention〕

Since the present invention is configured as described above, it has the following effects.

(1) Protruding ridges are provided on the pole edges of the stator yoke to facilitate the convergence of magnetic flux, and in addition, corresponding to these protruding ridges, the rotor's salient edge is diagonally located through a narrow space. Since the rotor is located at the same position, when the rotor starts rotating, most of the magnetic flux flowing to the stator yoke acts as magnetic flux that effectively contributes to the rotation of the rotor, significantly increasing the torque generated by the rotary solenoid. can do.

(2) In addition, as in the past, when increasing the generated torque, the ampere turns of the coil are increased,
There is no need to increase the diameter and axial dimensions of the rotor; the rotary solenoid can be constructed by aligning the ridges provided on the magnetic poles and the salient edges of the rotor so that the magnetic flux flows efficiently. The rotary solenoid can be made smaller than conventional rotary solenoids without having to be made particularly large in order to increase the generated torque.

(3) Moreover, since the generated torque can be increased, by using a large number of rotary solenoids, even if the power supply voltage drops slightly, the generated torque will not decrease significantly. It will not have any adverse effect on equipment that uses it as a drive source.

(4) Furthermore, in the present invention, since the stator yoke is formed in a substantially U-shape, the stator yoke can be attached to the winding machine with the coil bobbin divided into two parts being clamped to the bridging part of the stator yoke. The coil can be wound by rotating the coil, so compared to the conventional case where the coil is divided into two parts and wound around the magnetic pole, the coil conductor can be concentrated on one coil bobbin using the space of the magnetic pole. Because it can be wound, winding work can be done quickly, and there is no need to use a special structure for the winding machine itself.
Since the coil can be automatically wound using a general winding machine, the rotary solenoid can be manufactured economically with a simple structure.

In this way, the present invention increases the generated torque,
Moreover, it is possible to provide a rotary solenoid that is small and suitable for mass production, and because it does not increase in size even if the generated torque is increased, equipment that uses a rotary solenoid as a drive source can be installed in narrow spaces. It has many excellent effects, such as being easier to use.

[Brief explanation of drawings]

Fig. 1 is a front view of the rotary solenoid of the present invention, Fig. 2 is a longitudinal side view, Figs. 3 to 5 are explanatory views for explaining the operating state of the rotary solenoid of the present invention, and Fig. 6 is a - An explanatory diagram of usage conditions, Figure 7 is a permeance change rate-rotor angle characteristic diagram, Figure 8 is a generated torque-rotor angle characteristic diagram, Figure 9 is an explanatory diagram of a conventional rotary solenoid, Figures 10 and 11 The figure is also an explanatory diagram of the operation. 11... Stator yoke, 11b, 11b'... Magnetic pole, 11c, 11c'... Magnetic path piece, 15... Rotor, 15a, 15a'... Salient pole, g, h, j, k...
...ridge.

Claims (1)

[Claims] 1. The coil is attached to the upper bridging part of the stator yoke, which is formed into an approximately U-shape, and there are sharp ridges on the inside of the lower ends of the magnetic path pieces on both sides of the stator yoke to facilitate convergence of magnetic flux. A rotor is formed by forming arc-shaped magnetic poles facing each other, and between the magnetic poles, salient poles corresponding to these magnetic poles are formed in an arc shape, and the other part is flat. A rotary solenoid characterized in that the protrusion on the edge and the sharp protrusion formed on the edge of the magnetic pole are inserted diagonally so as to be rotatable.