Patent Translate Powered by EPO and Google Notice This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate, complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or financial decisions, should not be based on machine-translation output. DESCRIPTION JPS59117399 [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic vibrator used for vibration transport devices and the like of materials and products. [Background Art] As a transport apparatus for materials, products, etc., an electromagnetic vibrator is attached to a horizontal or inclined bowl-like tray, and the tray is vibrated to be transported. Common electromagnetic vibrators are often single-phase alternating current with a commercial frequency power source, and the structure is generally a large number of devices utilizing a two mass resonance system. These general structures are shown in FIG. 1 ((a) is a front view, (b) is a side view) and FIG. In this figure, the electromagnetic vibrator includes a yoke (a yoke) (]), a coil (2) attached thereto to generate a magnetic flux, a movable iron core (3) arranged with an air gap therebetween, and a resonant spring (41). , (41 'and. In the figure, (5) is a tray mass, (6) is a counter mass, and (7) is a support spring. When an alternating voltage is applied to the coil (2), a current flows and an attractive force is generated between the yoke (1) and the movable core (3), and the movable core (3) spring (41, (41 ") repulsive force Overwhelms and approaches York (11). When the instantaneous value of the voltage decreases and the suction force decreases, the force of the spring (4) becomes fat and the movable core (3) moves in the reverse direction. The tray mass (5) having the movable core (3) is structured to be vibrated with the opposing mass (6) via the resonance spring (41, 41 '. The resonance spring (4) connecting this tray mass (5) and the opposing mass (6), (The natural frequency of 41 'is close to the power supply frequency (the tray mass (5) with a slight vibration force) Can be vibrated greatly. FIG. 3 is a time chart of voltage when a commercial single phase alternating current is used, FIG. 4 is a time chart of suction force, and FIG. 5 is a time chart of amplitude of vibration. If the power source for exciting the coil uses a commercial single-phase alternating current as it is, the suction force changes as shown in Fig. 4 and the level of O can be twice per cycle, so the movable core (3) The frequency oscillates at twice the commercial frequency. Vibration in this 01-05-2019 1 state causes the movable core (3) to vibrate without returning to the stationary position as shown in FIG. However, a vibration having a frequency twice as high as the commercial frequency can not give sufficient amplitude to the tray mass (5), so that no practical effect can be expected. In order to ameliorate these problems, it is considered to control, for example, the waveform of a commercial power supply, half-wave conduction angle control by combination of single-phase and half-wave power supply by a rectifier or combined cycle etc. It has been devised that the same vibration frequency is generated and the amplitude control is performed. Figures 6, 7 and 8 show the attraction force and amplitude curves at half-wave voltage. In addition to the above-described half-wave voltage control, there is one that is devised to generate an oscillation frequency equivalent to the power supply frequency using a permanent magnet as described in Japanese Patent Publication No. 43-19493. 9 and 10 (FIG. 10 is a principle view of the configuration shown in FIG. 9). Is one example. This is a single E-shaped yoke (11) on the fixed side and a U-shaped permanent magnet (12) on the movable core, facing each other so that the salient pole parts are alternately inserted. By passing an alternating current to the exciting coil (13) of (11), a frequency equivalent to the power supply frequency is generated. That is, when the pole on the left side of the permanent magnet (12) sandwiching the center rod of the Eshaped yoke (11) is S in FIG. 10 and the pole on the right side is N, As in the above, the central pole of the yoke (11) has an S pole and N poles on both sides. As a result, the permanent magnet (12) moves in the left direction in the drawing by the magnetic attraction force and the repulsive force. Next, at the negative half wave of the power supply voltage, the central rod of the yoke (11) is excited to N + i, so the permanent magnet (12) moves to the right in the opposite direction. Thus, the permanent magnet (I2) vibrates to the left and right at the same frequency as the frequency of the power supply voltage. However, this method also has the following problems. ■ To make the magnetic action between the permanent magnet (I2) and the yoke (II) stronger, the air gap needs to be short (but then the moving stroke of the permanent magnet can not be taken too long, and the resonance occurs at the start The vibration stroke becomes very large when passing through the resonance points of the low-frequency eL number until the vibration reaches it or until the frequency falls from its resonance frequency at the stop time, and the yoke (11) and the permanent magnet become permanent. A so-called "striking" phenomenon occurs in which the magnet (12) repeatedly collides with it, leading to breakage of the movable part and deterioration of the spring. (2) In some cases, the center of the location where the magnetic repulsion force is generated and the center of gravity of the driven body (I2) can not always coincide with the center of the spring transmitting the vibration to the outside. Part of the repulsive force acts on the resonant spring as unnecessary twisting force, making its design difficult. SUMMARY OF THE INVENTION According to the present invention, the vibration stroke can be made relatively large by solving the above-mentioned conventional problems, and the center of the magnetic attraction / repulsion generation point and the center of gravity of the vibrating member are resonant springs. It is an object of the present invention to provide an electromagnetic vibrator that can improve the transmission of vibrational force to the tray mass 01-05-2019 2 by aligning with the center of the. The present invention has a cylindrical casing attached to a body to be vibrated, an inner wall of the casing, at least two salient pole parts, and an opening formed between the salient pole parts A U-shaped yoke mounted so as to point to the center of the casing, and a ring-shaped coil member taken at the opening of the same U-shaped yoke so that the central axis of the casing and the axial center coincide. An oscillating shaft supported on the axial center of the casing so as to be capable of vibrating in the longitudinal direction with respect to the casing, and an outer peripheral magnetic pole close to the salient pole portion of the yoke on the oscillating axis; The present invention relates to an electromagnetic vibrator comprising permanent magnets disposed and attached in a state in which the polarities of magnetic poles located between salient pole portions and outside both salient pole portions are different. EXAMPLES The present invention will be described based on the examples shown in FIG. 1I (longitudinal cross-sectional view) and FIG. 12 (cross-sectional view taken along line 1-1 of FIG. 11). In this figure, (21) is a casing, (22) is a U-shaped yoke (fixed iron core) arranged at a place where the circumference is divided into four, and (23) is attached to be fitted into this yoke (22). A rectangular coil, (24) a vibrating shaft made of a nonmagnetic material, (25) a disk spring which supports the vibrating shaft (24) to the casing (2I) so as to be able to vibrate in the longitudinal direction 26) a ring-shaped permanent magnet (vibrator) mounted on a vibration axis (24); (27a) to (27c) a yoke for forming a magnetic circuit. (28) is a movable mass. The ring-shaped permanent magnet, which is a vibrator, is one of the centers of the T-shaped cross section. It is arranged so that the inner side is the N pole (or S pole) and the outer side is the S pole (or N pole) around the land iron (27a), and the circumference of the center yoke (27a) is the N pole (or S pole) , And the outer yokes (27b) and (27c) (7) are configured so as to have a south pole (or a north pole). In the case where a plurality of permanent magnets between the yokes are formed, it is possible to obtain a vibrator having a large output capacity by stacking the permanent magnets in the axial direction so that the respective poles become salient poles. The U-shaped yoke (22) is arranged as a silicon steel sheet stratified iron core so that the magnetic flux of the ring-shaped permanent magnet (26) which is a vibration generating part can be fully utilized, in order to prevent eddy current loss generated by AC power supply. . The disc spring (25) can also be made of a metal leaf spring material, but in general, the peaks of the resonance point are smooth and fl? It is constructed in the form of a P-shaped material, or a shear-type rubber spring formed by bonding a metal inner cylinder and an outer cylinder with rubber. The U-shaped yoke (22) and the respective yokes (27a) to (27C) are center yokes between the poles (22a) and (22b) of the yoke (22) as shown in FIG. The yokes (27b) and (27c) on both sides are disposed outside the poles (22a) and (22b) of the yoke (22) so that (27a) is positioned. The movable mass (2B) is detachably or replaceably attached, and is configured to be capable of attaching an appropriate mass according to the setting of the constant of the two-mass resonant 01-05-2019 3 system. Now, when alternating current is applied to the coil (23), for example, one pole (22a) of the yoke (22) becomes an N pole and the other pole (22b) becomes an S pole in a positive half wave, as shown in FIG. As shown in the figure, the electromagnetic attraction force and the reciprocation force act on the permanent magnet (26), and the vibration shaft (24) moves to the right in the drawing against the supporting force of the disc spring (25) Do. Next, one of the poles (22a) of the yoke (22) is inverted to the S pole, and the other pole (22b) is inverted to the N pole in an AC negative half wave, and the oscillation axis (24) is on the drawing. The leftward swing J force is received, so that the vibration axis (24) vibrates at the same frequency as the power supply frequency. If the casing (21) of the electromagnetic vibrator having such a configuration is attached to the body to be vibrated, the body to be vibrated vibrates by the resonance action with the vibration axis (24). As described above, according to the present invention, the following effects can be obtained. {Circle over (1)} It is possible to provide a resonance type electromagnetic vibrator in which the 1 peristaltic stroke of the vibration axis is relatively thick (and a "beat" phenomenon between two masses does not occur. (1) Since the arrangement is such that the electromagnetic force acting on the ring-like permanent magnet is concentrated on the vibration axis, the generated electromagnetic force and the vibration transmission direction coincide with each other, thus the vibration transmission efficiency is good. [0002] Brief description of the drawings [0003] FIG. 1 is an explanatory view showing the outline of the configuration of a conventional electromagnetic vibrator, FIG. 2 is an explanatory view showing the operation principle thereof, and FIGS. 3 to 5 are vibrations when an AC power supply is given as an excitation voltage as it is 6 to 8 are waveform diagrams for explaining the temporal change of vibration generation when the half wave rectified voltage is given as the excitation voltage, and FIG. 9 is another conventional one. 10 is an explanatory view for explaining the operation principle, FIG. 11 is a longitudinal sectional side view showing the configuration of the embodiment of the present invention, and FIG. 12 is I of FIG. It is sectional drawing in -1 line. (21): Casing (22): U-shaped yoke (fixed iron core) (23): Coil (24): I Φ ((25): Disc-shaped spring (26): Ring-shaped permanent magnet (27a) ˜ (27c): Magnetic circuit forming yoke (28): Movable mass patent applicant Murakami Seiki Co., Ltd. agent Hand-made profit (2 people) Fig. 11 Fig. 12 01-05-2019 4 01-05-2019 5
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