Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1991-01-23
1993-08-24
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 91, 310 15, 198769, H02K 706, B65G 2724
Patent
active
052392198
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an electromagnetic vibrating apparatus for applying a vibrating force to objects to be vibrated, such as an electromagnetic feeder, an electromagnetic screen and the like.
BACKGROUND OF THE INVENTION
In an electromagnetic feeder used to convey materials or an electromagnetic screen used to sieve out materials, a trough or a sieving net is vibrated by AC excitation of an electromagnet.
More specifically, in these electromagnetic vibrating apparatuses, two masses are connected by a resilient member, and the resonant frequency of the structure is set to a level close to a power source frequency to enlarge a small electromagnetic force to a large one thereby applying strong vibrations to the trough or the sieving net.
A conventional electromagnetic feeder is excited with the number of vibrations having an audio frequency of a commercial power source, 50 Hz or 60 Hz. Therefore, in the case of the large type feeder, vibrational noises are violent and unpleasant, producing an environmental problem. Furthermore, as to the vibrating force, in the conventional electromagnetic feeder, only half the generated attractive force is utilized, providing the electromagnetic feeder with an extremely low rate of efficiency. In the case of the small feeder, this poses no significant problem but, in case of the large feeder, with a large current flow, there is a correspondingly large energy loss.
SUMMARY OF THE INVENTION
The present invention has been achieved in view of the above-described problem, and has as its object to relieve noises and enhance efficiency.
In order to the aforesaid object, an electromagnetic vibrating apparatus of the present invention comprises a movable core secured to one of two masses connected by a resilient member, two fixed cores secured to the other mass so that said fixed cores are positioned on opposite sides of said movable core, two exciting coils wound about said two fixed cores, and a control circuit for alternately applying a phase-controlled current to said exciting coils. The mass to which said movable core is secured is connected to the object to be vibrated.
Thereby, the vibration frequency of the movable core, half of the power source frequency, is a low frequency of 25 to 30 Hz so that unpleasant noises caused by vibrations can be greatly reduced. In addition, the rigidity can be lowered as compared with that of prior art, and therefore, the apparatus can be reduced in weight. Furthermore, since the electromagnet portion can be made approximately half, the apparatus can be miniaturized. Moreover, since the current can be lowered appoximately half, energy savings result.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a partly cutaway side view showing an embodiment of the present invention;
FIG. 2 is a composite sectional view taken on lines A--A, B--B, and C--C of FIG. 1;
FIG. 3 is a side view showing the mounted state of a vibrating apparatus of the present invention;
FIG. 4 is a waveform view showing the behavior of vibrations of the present invention;
FIG. 5 is a schematic view of a vibrating system;
FIG. 6 is a circuitry representation showing the structure of an embodiment of a control circuit;
FIG. 7 is a circuit representation showing an IC constituting a zero-cross comparator;
FIG. 8 is an operating waveform view showing the operation;
FIG. 9 is a circuit representation, showing an example of IC constituting a phase control portion;
FIG. 10 is an operating waveform view of flip-flop; FIG. 11 is a diagram of two outputs operated with an input;
and FIG. 12 is a waveform view of a voltage and a current flowing to a coil.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The present invention will be described in detail hereinafter on the basis of embodiments shown in the drawings.
In FIG. 1 and FIG. 2, reference numeral 4 designates a frame case for vibrating apparatus body, housing therein fixed cores 13, 13', a movable core 12 and a coil spring 5. The coil spring 5 is arranged on opposite sides of a flange 7a in the outer
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patent: 4260051 (1981-04-01), Burghart
patent: 4378064 (1983-03-01), Brown
patent: 4587863 (1986-05-01), Wadensten
patent: 4594521 (1986-06-01), Schlicher
patent: 4740946 (1988-04-01), Yumura et al.
patent: 4831292 (1989-05-01), Berry
patent: 4838771 (1989-06-01), Kikuchi
Matsumoto Eiji
Oshima Noritoshi
Murakami Seiki Mfg. Co. Ltd.
Nguyen Matthew
Stephan Steven L.
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