GB2125223A

GB2125223A - Electromagnetic driving device

Info

Publication number: GB2125223A
Application number: GB08222625A
Authority: GB
Inventors: Chun-Tsai Yeh
Original assignee: Individual
Current assignee: Individual
Priority date: 1982-08-05
Filing date: 1982-08-05
Publication date: 1984-02-29

Abstract

An electromagnetic driving device comprises an open duct (10), a plurality of electromagnetic members (30, 40) each having a through hole (32a, 42a) in the middle respectively disposed within both end portions (11, 12) of the duct (10), a plurality of coil windings (31, 41) coupled with the electromagnetic members (30, 40) and arranged in opposite phase at both ends in the duct (10), a permanent magnet armature (20) movably installed in the middle portion of the duct (10) relative to the electromagnetic members (30, 40) for making a straight and reciprocating motion therein in conjunction with the alternation of polarity of the electromagnetic members (30, 40), and a fixing cover plate (33, 43) having openings formed therein secured at each open end of the duct (10). Intake and exhaust valve arrangements (70) at both ends of the duct (10), each having flap valves 61-64 within chambers 71, 72 enable the device to act as an air pump or the armature 20 is attached to a push rod for driving a crank. <IMAGE>

Description

SPECIFICATION Electromagnetic driving device This invention relates to an electromagnetic driving device, in which a permanent magnetic setting is arranged for making a straight and reciprocating motion in conjunction with the alternation of polarity of electromagnetic members disposed therein so as to provide the direct driving force thereof.

Conventionally, ail the known electromagnetic driving devices are built in motor type for providing a rotary power therewith. In addition to the complicated structure of components and the procedure of coil windings, which always post a grave problem in both manufacturing and maintenance, the operational principle is based on the hunting action of the rotary field between the rotor and the stator thereof. Therefore, whenever the load thereof is too high (overloaded), the value of the input current in the motor is increased, often resulting in the burn-out of the coil windings thereof. Moreover, as the coil windings are rather complicated, maintenance and repair is time consuming, which is certainly a serious shortcoming in this competitive world.

It is accordingly a primary object of this invention to provide an electromagnetic driving device with a permanent magnetic setting movably disposed therein for making a straight and reciprocating motion in conjunction with the alternation of polarity of the electromagnetic members disposed therein so as to overcome the foregoing defect associated with prior-art electromagnetic driving device (motor).

Another object of this invention is to provide an electromagnetic driving device with intake and exhaust valve mechanism disposed thereto with respect to the straight and reciprocating motion of the permanent magnetic setting thereof so as to function as an economic and high-power air pump, of which the transmission mechanism is simplified, and the energy loss is reduced as well.

With these objects in view, this invention has the advantage that the structure is simple and compact, very convenient for installation and maintenance operations.

In another alternative this invention also resides in the advantage of being adaptable to a highpower air pump in which straight line motion is directly provided for the transmission instead of converting the rotary power into a straight line motion for the transmission so that the transmission mechanism thereof is economized and the energy loss incurred in the transferring process of power is also precluded.

According to the present invention, these and other objects are achieved by providing an electromagnetic driving device which comprises in combination an open duct, a plurality of electromagnetic members each having a through hole in the middle separately disposed within both end portions of the duct, a plurality of coil windings coupled with the electromagnetic members and arranged in opposite phase at both ends in the duct, a permanent magnetic setting movably installed in the middle portion of the duct relative to the electromagnetic members for making a straight and reciprocating motion therein in conjunction with the alternation of polarity of the electromagnetic members, and a fixing cover plate having a plurality of openings formed therein secured at both open ends of the duct.With a push rod disposed at each side of the permanent magnetic setting in the duct at one end and extending out of the end portions at the other end for being pivotally connected to a crank system thereof, the device of this invention functions as a compact driving motor. If, on the other hand, with intake and exhaust valve arrangement made at both ends of the duct, the device of this invention can function as a simple and precise air pump therewith.

Further characteristics and advantages of this invention will become more apparent to those skilled in the art from the following detailed description of the preferred embodiments when read in conjunction with the accompanying drawings, in which: Figure 1 is a horizontal sectional view of a first preferred embodiment of an electromagnetic driving device according to this invention; Figure 2 is a horizontal sectional view of a second preferred embodiment of an electrdmagnetic driving device according toLthis invention; Figure 3 is an operational illustration of the first preferred embodiment shown in Fig. 1; Figure 4 is a further operational illustration of the first preferred embodiment shown in Fig. 1; Figure 5 is an operational illustration of the second preferred embodiment shown in Fig. 2; and Figure 6 is a further operational illustration of the second preferred embodiment shown in Fig. 2.

Referring to Fig, 1, a first preferred embodiment of an electromagnetic driving device according to this invention comprises in combination an open duct 10 having a lower open portion 11 and an upper open portion 12, a pair of electromagnetic members 30 and 40 each having an iron core 32, 42 with a through hole 32a, 42a formed in the middle respectively installed in both open portions 11 and 12, two sets of coil windings 31 and 41 arranged in opposite phase and respectively disposed in both portions 11 and 12 with respect to the iron cores 32 and 42, a permanent magnetic setting 20 movably disposed in the middle portion thereof, and a pair of fixing cover plates 33 and 43 respectively secured at each open end of the duct 10.Each of the fixing cover plates 33 and 43 has an opening 33a, 43a respectively corresponding to the through hole 32a of the iron core 32 and the through hole 42a of the iron core 42, and an opening 33b, 43b formed therein for the leading out of the wire ends of the coil windings 31 and 41.The permanent magnetic setting 20 has a sliding sheath 21 of magnetic shielding material attached to the periphery of the permanent magnet thereof for controlling and concentrating the magnetic lines of force, and a shock-resisting magnetic alloy 22 separately disposed on each pole face of the permanent magnet thereof for strengthening the intensity of the magnetic structure.A fixed magnetic shielding plate 34, 44, respectively disposed around the edge of each pole face of the iron cores 32 and 42 at the end facing the permanent magnetic setting 20 for effectively controlling and concentrating the moving direction of the magnetic lines of force between the electromagnetic members 30, 40 and the permanent magnetic setting 20.A push bar 50 is disposed at each side of the permanent magnetic setting 20 (but only one push bar 50 is shown in Fig. 1) at one end and movably extending out of the through holes 32a and 42a as well as the openings 33a and 43a thereof for being pivotally connected at the other end to a shaft coupling 60 associated with a crank mechanism 80 including a link 70 pivotally connected to a crank shaft 81 coupled with a pair of belt rollers 83 (or a transmission gear) and mounted on a bearing system 82 so that a dynamic force can be effectively transferred to the crank mechanism 80 from the electromagnetic driving device of this invention.

Referring to Fig. 2, a second preferred embodiment of an electromagnetic driving device according to this invention (wherein all mernbers or elements identical with or corresponding to those illustrated in Fig. 1 are indicated by the same reference numerals, and, therefore, explanation of those members or elements is omitted hereinbelow) comprises an intake and exhaust arrangement disposed at both ends of the duct 10 as the main feature, which includes a plurality of air inlets 33a, 43a and air outlets 33b, 43b respectively formed in the fixing cover plates 33 and 43 in communicating with the through holes 32a and 42a thereof; a plurality of one-way check valves 61, 62, 63 and 64 separately matched with the inlets 33a, 43a and the outlets 33b, 43b for being activated by the dispiacement of the permanent magnetic setting 20; and a cowling member 70 provided at each end of the duct 10. Each of the cowling member 70 includes a low-pressure storage chamber 71 with an intake port 73 matched with the check valves 62, 63, and a high-pressure storage chamber 72 with an exhaust port 74 matched with the check valves 61, 64 so that a simple and precise structure of an air pump according to this invention is accomplished therewith.

Shown in Figs. 3 and 4 is an operational illustration of the first embodiment of Fig. 1.

Supposing that the polarity of the permanent magnetic setting 20 is as shown in Fig. 3 and that, during the time from To to T,, the input current flowing through the coil windings 31 and 41 in opposite phase thereat causes the electromagnetic member 30 to emerge in a magnetized state with the north pole (N) on the left and the south pole (S) on the right while the electromagnetic member 40 appears in a reverse magnetized condition with the south pole (S) on the left and the north pole (N) on the right, so that, by the attraction force of the electromagnetic member 30 and the repulsion force of the electromagnetic member 40, the permanent magnetic setting 20 moves to the left against the electromagnetic member 30 as shown in Fig. 3.

As a result, one of the push rods 50 will pull down the link 70, which in turn drives the belt rollers 83 through the crank mechanism 80 at one end as shown in Fig. 3; while, the other push rod 50 (not shown) will make a push-up motion simultaneously therefrom. In the meantime, the alternation of the current flowing in the coil windings 31 and 41 will change the polarity of both electromagnetic members 30 and 40 into a reversal condition as shown in Fig. 4, and, therefore, the permanent magnetic setting 20 moves backward to the right against the electromagnetic member 40. Consequently, the push rods 50 will also make a reversal movement in driving the crank mechanism 80 to make a continuous turn therefrom.Therefore, following the alternation of polarity of the electromagnetic members 30 and 40 through the constant change of the current flowing in the coil windings 31 and 41, the permanent magnetic setting 20 makes a continuous straight and reciprocating motion in the duct 10 so as to produce the required dynamic force in driving the associated machine tool such as the crank mechanism 80 as shown in Figs. 3 and 4 or a transferance gear system connected thereto.

Shown in Figs. 5 and 6is an operational illustration of the second embodiment of Fig. 2, wherein, the reciprocating-movement principle of the permanent magnetic setting 20 is the same as that described above for the first embodiment shown in Figs. 3 and 4 with the exception that the push rod arrangement thereof is replaced by an intake-and-exhaust valve fitting provided at both ends of the duct 10, so that, when the permanent magnetic setting 20 is moving toward the left against the electromagnetic member 30 as shown in Fig. 5, the one-way check valve 61 at the left end of the duct 10 is activated to let the air be compressed into the high-pressure storage chamber 72 of the cowling member 70 and exhausted out of the exhaust port 74. In the meantime, the one-way check valve 63 at the right end of the duct 10 is also activated to let the air come into the duct 10 through the intake port 73 via the low pressure storage chamber 71 of the cowling member 70 until the permanent magnetic setting 20 stops its movement therein. While, when the current flowing through the coil windings 31 and 41 changes its direction, the polarity of both electromagnetic members 30 and 40 will be reversed accordingly so that the permanent magnetic setting 20 will move back from the left to the right in the duct 10 as shown in Fig. 6.As a result, the same operations of compression and exhaust through the one-way check valve 64 and the exhaust port 74 via the high-pressure storage chamber 72 at the right end of the duct 10 as well as the inflow of the air through the one-way check valve 62 and the intake port 73 via the low-pressure storage chamber 71 at the left end of the duct 10 will take place therewith. Therefore, following the alternation of polarity of both electromagnetic members 30 and 40 through the constant change of the current flowing in the coil windings 31 and 41, the permanent magnetic setting 20 will continuously make a straight and reciprocating motion therein so as to perform an effective airpump operation therewith.

While various advantageous embodiments have been chosen to illustrate this invention, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of this invention as defined in the appended

Claims

claims. CLAIMS

1. An electromagnetic driving device comprising in combination: an open duct having a lower portion and an upper portion; a permanent magnetic means movably disposed in the middle space of said open duct for making a straight and reciprocating motion therein; a push rod separately secured at each side of said permanent magnetic means at one end and movably extending out of both open ends of said open duct at the other; an electromagnetic means having a through hole formed in the middle respectively installed within said lower portion and said upper portion of said open duct with part of the stem of said push rods separately accommodated in said through hole; and a pair of fixing cover plates having a plurality of openings formed therein respectively secured at each open end of said open duct with respect to said electromagnetic means, so that, when a crank mechanism is pivotally connected to said push rod at both ends thereof, a compact electromagnetic driving device with a straight and reciprocating motion is accomplished therewith.

2. An electromagnetic driving device as claimed in Claim 1 wherein said permanent magnetic means comprises a permanent magnet, a sliding sheath of magnetic shielding material disposed around the periphery of said permanent magnet for controlling and concentrating the magnetic lines of force thereof, and a shock-resisting magnetic alloy separately disposed on each pole face of said permanent magnet thereof for strengthening the intensity of the magnetic structure thereto.

3. An electromagnetic driving device as claimed in Claim 1 or 2 wherein said electromagnetic means further comprises: a pair of iron cores each having a through hole formed in the middle; two sets of coil windings separately arranged in opposite phase and disposed within both end portions of said open duct with respect to said iron cores; and a fixed magnetic shielding plate respectively disposed around the edge of each pole face of said iron cores facing said permanent magnetic means for effectively controlling and concentrating the moving direction of the magnetic lines of force therebetween.

4. An electromagnetic driving device comprising in combination: an open duct having a lower portion and an upper portion; a permanent magnetic means movably disposed in the middle space of said open duct for making straight and reciprocating motion therein; an electromagnetic means having a through hole formed in the middle respectively installed within said lower and upper portions of said open duct; a pair of fixing cover plates having a plurality of inlet and outlet openings formed therein respectively secured at each open end of said open duct; a plurality of one-way check valves separately disposed at said inlet and outlet openings of said fixing cover plates; and a cowling member including a low-pressure storage chamber matched with an intake port, and a high-pressure storage chamber matched with an exhaust port, secured over said fixing cover plate at each end of said open duct, so that, with a straight and reciprocating motion provided by said permanent magnetic means therein following the alternation of polarity of said electromagnetic means, an effective air-pump operations are performed therewith.

5. An electromagnetic driving device as claimed in Claim 4 wherein said permanent magnetic means further comprises a permanent magnet, a sliding sheath of magnetic shielding material disposed around the periphery of said permanent magnet for controlling and concentrating the magnetic lines of force thereof, and a shockresisting magnetic alloy separately disposed on each pole face of said permanent magnet thereof for strengthening the intensity of the magnetic structure thereto.

6. An electromagnetic driving device as claimed in Claim 4 or 5 wherein said electromagnetic means further comprises: a pair of iron core each having a through hole formed in the middle; two sets of coil windings separately arranged in opposite phase and disposed within both end portions of said open duct with respect to said iron cores; and a fixed magnetic shielding plate respectively disposed around the edge of each pole face of said iron cores facing said permanent magnetic means for effectively controlling and concentrating the moving direction of the magnetic lines of force therebetween.

7. A linear electromagnetic machine comprising a magnetic piston means and first and second electromagnetic means disposed relative to said piston means and energisable so as to reciprocate said piston means in a substantially linear manner.

8. An electromagnetic driving device constructed and arranged substantially as hereinbefore described with reference to Figs. 1, 3 and 4 or Figs. 2, 5 and 6 of the accompanying drawings.