US 1849085 A
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March 15, 1932. B. J. HASKINS 1,849,085
SUPERCHARGER FOR MAGNETS Filed May 26, 1930 WW H Patented 15, 1932 UNITED STATES PATENT OFFICE BUTLER meme, OF CHICAGO, ILLINOIS, ASSIGNOB 'IO JOSEPH WEIDENHOFF, INC.,
01 CHICAGO, ILLINOIS, CORPORATION 01 ILLINOIS.
surnncmoan roa manure Application fled Kay 20,
This invention relates to an alternating current supercharger for magnetizing mag- I direct. current magnetizers, and because of the heavy current flowing special switchboards have been required to provide ap aratus capable of taking care of the are t at followed on opening the high amperage circuit.
An object of the present invention is to provide a simple but effective magnetizer which will operate off the ordinary alternating current lighting circuit, and which requires no special apparatus to handle the are generated on opening the energizing circuit.
This and other objects, as will hereinafter appear, areaccomplished by this invention, which is fully described in the following specification and shown in the accompanying drawings, in which- Figure 1 is a perspective view of the supercharger; and
Fig. 2 is a wiring diagram of the same.-
supercharger having a base 10 on which are mounted two magnets 11 and 12, which are energized by a rectified alternating current, as will later be described, and which have pole pieces 13 and 14 which are preferably placed in the same horizontal plane so as to support a magneto A. or the like, having magnets which it is desired to magnetize. The magnet coils 11 and 12 have iron cores (not shown) which are connected through the base 10 so as to provide a continuous U- shaped magnetic path, which is open only at the top and which is completed through the magnets of the magneto A when the latter is placed thereon.
Referring now to Fig. 2. An auto-transformer 15 base primary coil P and a secondary coil S. The ends of theprimary P are connected through a suitable switch 16 and flexible leads 17 with a suitable source of alternating current 18, such as 110 volt lighting circuit. The center of the primary P is tapped with a lead 19 which connects with a central pole 20 of a double pole double throw use. we no. 465,708.
reversing switch 21, thereby making each half of the prima P .a secondary during alternate half cyc es of the energizing current. The central pole 20 connects through a knife 22 with contacts 23 and 24, depending on which way the knife 22 is thrown.
The contact 23 isconnected to one end of the magnet coil 12, while the contact 24 connects through a lead 25 with the contact 26. Likewise the contact 23 connects through a lead 27 with the contact 28. A center pole29 of this switch carries a knife 30 similar to the knife 22 which moves with the knife '22, and
alternately engages the contacts 26 or 28.
- The ends of the primary coil P are connected through leads 31 and 32 with the anodes or disks 33 and 34 of rectifier bulbs 35 and 36, respectively. The ends of the terminals of the filaments or cathodes 37 and 38 of these bulbs are connected by means of leads 39 and 40,- and these are connected to the ends of the secondary coil S by means of leads 41 and 42, respectively. The lead is also connected through a lead 43 with the central pole 29 7 of the reversing switch 21. The contact 26 The embodiment illustrated comprises '11 as shown in Figs. 1 and 2, and the operating switch 16 closed thereby energizing the transformer 15, an induced current from the secondary S of the transformer 15' will heat the filaments or cathodes 37 and 38 of the rectifier bulbs 35 and 36, thereby causing an electron flow from the cathodes to the'anodes, first in one of these bulbs, and then in the other as the alternation of the current takes place. At the same't-ime a flow of the current takes place from the anode 33 to the cathode 37 inthe bulb 35, and the same flowalternating takes place in the bulb 36.
The current thus set up is a pulsating direct 1 ing coils 11 and 12 in one direction.
suspends the magneto A by a cord and bI'IDg S firstiopening the-switch 16',=a'fter which the knives 22 and 30 of'the reversing switch 21 current which flows alternately from the rectifier bulbs 35 and 36, and (passes through the lead 43, the knife 30,, an the lead 44, and
thence through the magnet coils 10 and 12,
the leads 46, 22, and 19, back to the center tap of the primary windin P.
The current that thus is caused to flow through the magnet coils 10 and 12 is of a pulsating nature, the electromotive force of this energizing current tending to take substantially the form of a rectified sine wave. The inductance of the coils 11 and 12 is so great, however, that these act as shock coils,
charge the magnets of a magneto as A,-closes the switch, thereby energizing the ma netizlie then it into the field of these coils so as to determine" whether the magnetizing co1ls 11 and 12 are magnetized in the proper dlrection for further magnetizing or supercharging the magnets of this magneto. If the magnetic lines of the flux are running in the same direction in both the magneto A and in the magnetizing coils 11 and 12, the, magneto will be drawn straight down toward the supercharg- If not, the magneto will turn as it descends so as to assume the proper charging position.
With some magnetos the operator will merely turn the magneto so as to bring it to the correct-position. With other forms of magnetos,'however, the magneto cannot readi- 1y be reversed with respect to the pole pieces 13 and 14, and in other cases it is much more desirable to do the supercharging with the magneto A set in one positionrather than the reverse position.
Reversing'theg magne'tic flux'flthrough the magnetizing coils 11 and 12 is a very simple matter with; this apparatus, and consists in are thrownfrom 'oneset of contacts across to the other, thereby reversing thedirection of current through thevcoils 11 and 12. Having done'thifs, the operator then closes the switch 16 thereby-energizing the magnetizing coils 11 and 12 inthe reverse direction.
The magneto A shown is of a type having a'flat base which readily adapts it to be used on the supercharger, as shown. With other types of magnetos, however, it is not such a simple matter, and adapters (not shown) are applied on the pole pieces .13 and 14 to secondary for rectify carry the magnetic flux to the magnets to be charged.
While the transformer 15 shown is of the auto-transformer type, it will be understood that a full transformer with a separate secondary winding may readily be substituted therefor.
Thus it will be seen that a very simple and efl'ective\form of magnetizing supercharger is provided. While the magnetizing current flowing through the coils 11 and 12 is ver heavy, the current flowing through the switc 16 is relatively small so that the switch 16 can be opened without d'angerto the apparatus. It will be seen, however, that the reversing switch 21 cannot be opened while current is thus flowing through the magnetiz- -ing coils, asthe are which would thus be induced would be so great as to do considerable damage both to the reversing switch and to other parts of the apparatus, particularly the rectifier bulbs 35 and 36.
While I have shown and describedbut a few embodiments of my invention, it is to be understood that it is capable of many modifications. Changes, therefore, in the construction and arrangement may be made which do not depart from the spirit and scope of the invention as disclosed in the appended claims.
'1. A charger for magneto magnets comprising a transformer adapted to operate on an alternating current line, means for rectifying the current from the seco dary of the transformer, and a magnetizing coil supplied with current from said rectifier, said magnetizing coil being capable of charging a magneto magnet and serving as a choke for current from said rectifier so as to produce a substantially even flow of current therein.
2. A charger for magneto magnets comprising a transformer adapted to operate on an alternating current line, a rectifier bulb for rectifying the current" from the secondary of the transformer, and a magnetizing coil supplied with current from said rectifier, said magnetizing coil being capable of charging a magneto magnet and serving as a choke for current from saidrectifier so as to produce a substantially even flow of current therein. 1 3. A charger for magneto magnets comprising a transformer adapted to operate on an alternating current line, two opposed rectifier bulbs connectedto the two ends of the ing the current from the secondary of the transformer, and two adjacent magnetizing coils supplied with current from said rectifier, said magnetizing coi ls serving as a choke for current from said rectifier so as to produce asubstantially even flow of current therein.
4 Av charger for magneto magnets comprising a transformer adapted to operate on an alternating current line, means for rectifying the current fromthe secondary of the transformer, two adjacent magnetizing coils supplied with current from sai rectifier, said magnetizing coils serving as a choke for current from said rectifier so asto produce a substantially even flow of current therein, and a switch in the primary circuit of the transformer for o ening and closing the s me.
5. A charger yer ma eto magnets omprising a transformer a d pted t0 oper to on an alternating current line, means for ectifying the current from the secondary of the transformer, a magnetizing coil supplied with current from said rectifier, said mag-. netizing coil serving as a choke for current .from said rectifier so as to produce a substantially even flow of current therein, a switch in the primary circuit of the transformer for opening and closing the same, and a switch for reversing the direction of flow of current through said magnetizing coil.
In testimony whereof, I have hereunto set my hand this 19th day of May, 1930.
BUTLER J. HASKINS.