JPS5837791B2 - Rotary displacement drive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary displacement drive device that performs reciprocating motion only by the magnetic force of the drive device.

Conventional drive devices for the purpose of reciprocating motion include devices that utilize electromagnetic force, such as plungers, transistor-driven balances, and sonic motors.

These devices are displaced from their normal position when an external input is applied, and return to their original position when the input is removed.
The motion of one process is converted into rotational motion, such as in a clock, through some means.

As for the force for returning to the original position, the force for returning to the original state cannot be obtained unless the full swing of the whiskers is used, or a spring or similar elastic force is used.

When the reciprocating drive device that uses the above-mentioned whiskers to obtain a restoring force is used in a watch and is installed in a car,
It is unsuitable because the vibration is large and accurate steady motion cannot be obtained.

Furthermore, in terms of torque, the above-mentioned drive device has drawbacks such as being large in size because in the past, electromagnetic force acts against the return force of a spring or the like, so it requires electromagnetic force to overcome the return force.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, an object of the present invention is to provide a rotary displacement drive device that returns itself by the magnetic force of the drive device without using an additional return force such as a spring.

The feature of the present invention is that the magnetization angle between different poles magnetized on the rotor is 2
α, the magnetic pole angle of the stator is set to β which is larger than the magnetization angle 2α, and the rotation angle γ of the rotor is regulated to a constant amount.

The present invention will be explained below with reference to illustrated embodiments.

In FIGS. 1 to 3, the rotary displacement drive device includes an E-shaped stator 2 formed of a soft magnetic material, and a U-shaped side plate 2 of the stator 2.
The rotor 3 is arranged at the center of a magnetic pole having both free ends 21a and 2lb of the rotor 1 curved.

An iron core 22 is fixed to the center of the U-shaped portion of the U-shaped side plate 21, and a coil bobbin 41 having an excitation coil 4 wound around the iron core is fitted.

The stator 2 is placed on a substrate 5 and fixed by a plurality of fixing parts 51.

A rotating shaft 6 is fixed to the rotor 3 and supported by bearings provided on the substrate 5 and another substrate 52 disposed above the substrate.

The outer periphery of the rotor 3 is magnetized to N and S.

The magnetized positions are such that the same polarity is formed on the diagonal line A passing through the rotation axis.

The magnetization angle is set so that the distance between magnetized members of different polarity is 2α.

The width of the curved magnetic poles of the stator 2 is expressed as an angle β, and is set larger than the magnetization angle 2α of the rotor 3.

The above angles α and β are, for example, α = 300 and β = 900.
Set to .

The excitation coil 4 of the stator 2 is connected to a power supply circuit 7 as shown in FIG. 5 to supply power.

FIG. 5 shows a power supply circuit for an automobile watch, in which a protection circuit 72 is connected to a car battery power supply 71, and a constant voltage circuit 73 and the excitation coil 4 are connected to the protection circuit 72.

An oscillation frequency dividing circuit 74 is connected to the constant voltage circuit 73.

The oscillation frequency dividing circuit 74 is composed of a plurality of capacitors K and G and a crystal oscillator X, and the oscillation circuit 74 is provided with terminals a, b, and c.

The collector of a transistor Tr is connected to the other end of the excitation coil 4, and its emitter is grounded.

Terminal a or b of the oscillation frequency dividing circuit is connected to the base.

From both terminals, for example, a DC pulse signal of I Hz is output from the a terminal, and a DC pulse signal of Hz is output from the 1 b terminal, and a pulse current is supplied to the excitation coil 4 via the transistor Tr to excite it.

A switch SW is connected to the C terminal and one end of the constant voltage circuit 73, and is closed when resetting the clock.

The IHz output signal 1 is used for controlling an analog watch with a second hand, while the Hz signal is used for controlling a watch without a second hand.

The operating principle of the rotary displacement drive device 1 is that when no pulse voltage is applied to the excitation coil 4, the rotor 3 is fixed by the reluctance torque of the magnets magnetized to the rotor 3, as shown in Fig. 4A. ing.

Next, as shown in the figure, when an application is applied to the excitation coil 4 to magnetize the curved magnetic poles 21a and 2lb of the stator 2 to the S pole and the iron core 22 to the N pole, rotational force is generated in the rotor-3. The rotor rotates counterclockwise.

If the rotor can be rotated freely by force, it will rotate to the position shown in Figure 2 and stop when DC voltage E is applied.

When the voltage is removed in the state shown in Figure 2, the magnetization of the magnetic poles 21a and 2lb of the stator 2 disappears, but between the rotor 3 and the stator 2, as shown in Figure 2, the magnets of the rotor S of
The poles remain stationary at the position of the iron core 22 of the stator 2, creating a magnetic path loop and no return force is generated.

Therefore, we considered providing a regulating means in the rotational direction of the rotor 3 to control the rotation angle γ of the rotor. The applied voltage was removed by rotating the child.

The magnetic path loop at this time is shown in Figure C. In this state, the reluctance torque remained stationary as the left and right rotational forces were balanced.

However, if the position of the regulating means is further changed to stop the rotor 3 before the state shown in Figure C and the voltage applied to the excitation coil 4 is removed, the rotor 3 will experience a stronger restoring force due to the reluctance torque. It turned out that the robot returned to position A and stopped.

The regulating means may be formed by providing a pin on the lower surface of the rotor 3 and a protrusion on the substrate 5, or may be provided on a rotating member to which the rotation of the rotor 3 is transmitted.

When the DC pulse voltage of the power supply circuit 7 shown in FIG. 4 is applied to the excitation coil 4 and a pulse current is supplied, the pulse CI)O
In accordance with the N and OFF states, the rotor 3 can be made to perform a reciprocating motion of rotation and self-return without applying an external restoring force.

In the experiment, when the rotation angle γ of the rotor is 35°, and the width of the magnetic poles 21a and 2lb of the stator 2 is β = 90°, the spacing between the N and S poles magnetized on the rotor is As shown in FIG. 3, self-return can be achieved by setting α=300 or less on the left and right sides from center points P and Q, respectively.

When the rotary displacement drive device is configured as described above, even if vibration is applied to the device, the force that rotates the rotor in a deformed state where the return spring is bent, for example, is not generated anywhere, and the rotor is well-balanced, its center of gravity is the center of rotation, and it is held still in a predetermined position by reluctance torque, so it can withstand fairly large vibrations, and the watch incorporating the rotary displacement drive device of the present invention can be used in automobiles, etc. It is possible to equip the

The stator 2 may be made of a soft magnetic material, and the side plates 21 and the iron core 22 may be integrally punched or shaped and laminated, or may be formed separately and fixed.

The rotor 3 may be formed by using a rotor cut along two diagonal lines A and A passing through the axis of rotation as shown in FIG.

FIG. 7 shows still another embodiment, in which the rotor 3 is magnetized in the axial direction by N and S magnetization, and the magnetic pole relationship on one plane is on a diagonal line passing through the rotation axis as in the other rotors mentioned above. We have placed like-minded comrades in the area.

The stator 2 has an iron core 26 passed through a flat coil bobbin 42.
Side plates 27 and 28 are provided above and below.

The operating principle is the same as the other embodiments described above.

Since the present invention is configured as described above, the electromagnetic force can be used as 100% rotational force without using an additional return mechanism such as a full-length beard.

In addition, since there is no return mechanism that bends and deforms due to vibrations such as hair movement, a drive device that is not affected by vibrations can be obtained.

Since no return mechanism is required and no electromagnetic force is required to overcome the return force, the drive device can be significantly downsized.

Even though it is small, sufficient rotational output can be obtained, so there is no need to use expensive magnetic materials such as rare earth magnets for the rotor.
The device can be manufactured at low cost due to its miniaturization and simplification of assembly.

When used in equipment that requires low-speed, constant rotation, such as watches, it has the advantage of not requiring a speed reduction mechanism compared to conventionally used drive sources such as synchronous motors. ing.

Furthermore, since the responsiveness is good, it is possible to provide a rotary displacement drive device that has excellent effects such as extremely low power consumption.

[Brief explanation of drawings]

The drawings show one embodiment of the rotational displacement drive device of the present invention, and the first embodiment
The figure is an external perspective view of the main body parts, Figure 2 is a plan view of the stator,
Fig. 3 is an explanatory diagram of the relationship between the stator magnetic poles and the rotor, Fig. 4 is an explanatory diagram of an embodiment of the power supply circuit that supplies power to the present rotary displacement drive device, and Fig. 5 is a diagram illustrating the relationship between the stator magnetic poles and the rotor. FIG. 6 is an explanatory diagram of the self-returning principle, FIG. 6 is an explanatory diagram of another shape of the rotor, and FIG. 7 is an explanatory diagram of another embodiment in which the magnetization direction of the rotor is changed. 2... Stator, 21, 27, 28...
Side plate, 2 1 a t 2 l b...Magnetic pole,
22, 26... Iron core, 3... Rotor,
4... Excitation coil, 41, 42... Coil bobbin, 5, 52... Board, 51...
... Fixed part, 6 ... Rotating shaft, 7 ... Power supply circuit, 2α ... Magnetizing angle, β ... Magnetic pole angle, γ ... ···Angle of rotation.

Claims (1)

[Claims] 1. A rotor with the same polarity magnetized at the outer peripheral position on a diagonal line that intersects with the rotation axis, and a magnetization angle 2α between different poles, and a rotor with a magnetic pole angle β wider than the magnetization angle 2α of the rotor. An exciting stator, and a regulating means for regulating the rotation of the rotor to a range that can be self-reset by reluctance torque between the rotor and the stator, and exciting the stator with a DC pulse current. . A rotary displacement drive device, wherein the rotor is rotated to a position where its rotation is regulated by the regulating means and then self-reset by the reluctance torque.