JPH0353447Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Field of the invention This invention relates to a rotary solenoid that obtains rotational force from a rotor shaft.

(b) Background of the invention Conventionally, the above-mentioned rotary solenoid was
There were structures shown in FIGS. 5 and 6, or structures shown in FIGS. 7 and 8.

That is, the rotary solenoid shown in FIGS. 5 and 6 has a permanent magnet 42 fitted to a rotor shaft 41 which is supported between bearings 40 and 40.
a rotor 44 formed by integrally attaching rotor poles 43, 43 to both ends of the rotor 44; It is constituted by coils 49, 49 wound around the bases 48, 48 of the yoke teeth 47, 47.

The rotary solenoid having the structure shown in FIGS. 7 and 8 includes a rotor 54 formed by fitting a permanent magnet 53 to a rotor shaft 52 that is supported between bearings 51 and 51, and a rotor 54 that is connected to a yoke 55. It is constituted by yoke tooth parts 56, 56 which are opposed to each other, and a coil 57 wound around the yoke 55.

In both of these conventional structures, the coil 49,
Since the space for winding the coils 49 and 57 is small, the heat dissipation effect of the coils is poor, and as a result, the input voltage cannot be increased and sufficient rotational torque cannot be obtained.

(c) Purpose of the invention This invention forms a magnetic circuit by connecting both outer sides of two yoke teeth with a yoke member, and winds a coil around this yoke member to achieve sufficient heat dissipation effect. The object of the present invention is to provide a rotary solenoid that can increase the input voltage.

(d) Summary of the invention This invention provides two yoke members that connect with the two yoke teeth on both sides of the two yoke teeth to form a magnetic circuit, and these two yoke members form a magnetic circuit. The rotary solenoid is characterized by having a coil wound around a yoke member.

(e) Effects of the invention According to this invention, the coil winding space is doubled compared to the conventional one, and a sufficient heat dissipation effect can be obtained, which makes it possible to increase the input voltage.
Sufficient rotational torque can be obtained.

(F) Embodiment of the invention An embodiment of the invention will be described below in detail based on the drawings.

The drawings show a rotary solenoid, and in FIG.
is rotatably formed by attaching a permanent magnet 13 to a rotor shaft 12, and two yoke tooth parts 14, 14 made of soft magnetic material face each other with the rotor 11 mentioned above in between, and the opposing surface 15 , 15 are formed in a concave shape to allow the rotor 11 to rotate.

Both sides 16, 1 of the above-mentioned yoke teeth 14, 14
6 each include a yoke member 1 made of a soft magnetic material.
7 and 17 are connected and fixed to form a closed magnetic circuit, and coils 19, 19 wound around bobbins 18, 18 are attached to the intermediate part of these yoke members 17, 17.

The above-mentioned coils 19, 19 may be connected in series or in parallel, but they are connected so that when energized, magnetic flux is generated from one side of the yoke teeth 14 to the other in the same manner.

Rotary solenoid 10 configured in this way
In this case, the rotor 11 is biased to the normal original position shown in the figure by a suitable return spring, and in this state, the coils 19, 19 are energized, for example, in the positive direction, and the respective yoke teeth 14, 14 are energized in the positive direction. When the rotor 11 is magnetized to the polarity shown, the rotor 11 rotates 90 degrees clockwise and stops, and this rotational force is extracted from the rotor shaft 12.

FIG. 2 is an actual measurement diagram illustrating an example of the temperature rise characteristic of the above-mentioned rotary solenoid 10, together with an example of an actual measurement of a conventional rotary solenoid.As shown in FIG. Attach yoke members 17, 17 to 16, 16,
The actual measurement curve B shows the case where one yoke member 17 and coil 19 are removed and only one yoke member 17 and coil 19 are used to correspond to the conventional example. It shows.

In both of these methods, the initial input power is set to the same value, and the temperature rise of the coil 19 is measured over time using the resistance method under the condition that the applied voltage is constant.
This was actually measured.

In the measured curve A of the example, the saturation temperature rise Δθ ₁ and the time constant of temperature rise τ ₁ In the measured curve B of the conventional example, the saturation temperature rise Δθ ₂ and the time constant of temperature rise τ ₂ Actual measurement example shown in Fig. 2 Then, Δθ ₂ /Δθ ₁ ≒1.2 τ ₂ /τ ₁ ≒0.67.

On the other hand, in actual measurements of generated rotational torque, no difference was observed between the two if the input power was the same.

Therefore, under the condition that the temperature rise of the rotary solenoid is suppressed to a constant value, the solenoid 10 of the embodiment of this invention can increase the input power by about 1.2 times, and the generated rotational torque can also be increased by that amount. .

Furthermore, the large time constant of temperature rise has the effect of reducing temperature rise when applying pulses of equal voltage and equal time width, and reducing the decrease in generated rotational torque due to increase in resistance.

3 and 4 show a rotary solenoid 10 with a more specific structure, and the same parts as those shown in FIG. 1 are given the same numbers.

That is, the permanent magnets 13 that constitute the rotor 11
Rotor poles 20, 20 are fixed to both ends of the
The rotor shaft 12 is supported by outer cases 22, 22 made of non-magnetic material via bearings 21, 21.

The yoke tooth parts 14, 14 are attached between the above-mentioned outer cases 22, 22 by rivets 23.

Both sides 16, 1 of the above-mentioned yoke teeth 14, 14
In 6, notches 24 are formed so that the bobbins 18, 18 of the coils 19, 19 can be fitted therein, and the upper and lower portions of both side surfaces 16, 16 are formed to protrude outward.

The left and right yoke members 17, 17, into which the bobbin 18 of the coil 19 is inserted, are formed into plate-like bodies, and both upper and lower ends thereof are connected to both side surfaces 1 of the aforementioned yoke teeth 14, 14.
6 and 16 with screws 25... to form a closed magnetic circuit.

Rotary solenoid 10 configured in this way
is used in the same manner as in FIG. 1, but in its manufacture, since the yoke members 17, 17 are plate-shaped, the coil 19 can be easily attached.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, in which Fig. 1 is a cross-sectional view of a rotary solenoid, Fig. 2 is an actual measurement diagram of temperature change over time, and Fig. 3 is a partially sectional front view of another example of a rotary solenoid. Fig. 4 is a partially sectional side view thereof, Fig. 5 is a front view of a conventional rotary solenoid, Fig. 6 is a sectional view taken along the - line of Fig. 5, and Fig. 7 is a front view of another conventional rotary solenoid. , and FIG. 8 is a cross-sectional view taken along the - line in FIG. 7. 10... Rotary solenoid, 11... Rotor, 12... Rotor shaft, 13... Permanent magnet, 14
... Yoke tooth portion, 16 ... Side surface, 17 ... Yoke member, 19 ... Coil.

Claims (1)

[Claims for Utility Model Registration] A rotary solenoid formed of two opposing yoke teeth and a rotor that rotates between the opposing yoke teeth and is equipped with a permanent magnet, A rotary solenoid in which two yoke members are provided on both outsides of the yoke teeth and are connected to the two yoke teeth to form a magnetic circuit, and a coil is wound around these two yoke members.