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Title: |
1895 Article-W. H. Allen & Co., Reckenzaun Electric Motor |
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Source: |
Modern Mechanism 1895 pg 540 |
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Insert Date: |
9/5/2011 9:48:22 PM |
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Fig. 1 is a perspective view of a motor designed by Mr. A. R. Reckenzuun, in 1884 and exhibited at that exhibition. The magnets are, in appearance, somewhat similar to those employed in the Siemens dynamo, except that, as will be seen from the cut, the cores are in an inclined position, the upper and lower core ends meeting at a rather acute angle. This arrangement saves space, reduces the weight, and renders the frame rigid. The armature consists of a ring, made up of a series of rings, each of which is again composed of e number of links provided with holes at their ends to receive the bolts which hold the links as well as the rings together. The links, overapping one another, are insulated from each other in order to avoid Foucault currents. From 12 to 36 bobbins surround the ring thus formed, and connect with a commutator made up of a corresponding number of sections. A pair of brush holders carry two brushes, movable within a certain range to adjust the speed of the motor. Inside the armature is a magnet, resting loosely on the shaft by means of rollers. This internal magnet is, in cross section, H-shaped, having two pole pieces, between which a quantity of fide wire is wound lengthwise, the ends of which are connected to- copper brushes, which, in running, rub against two brass collars fitted upon the shaft inside the armature. These inside collars are in metallic connection with a pair of similar collars at the commutator, where another pair of brushes rests on them, picking up a small current for the internal magnet. This internal circuit forms a shunt to the main circuit. The internal magnet, on being excited, offers two poles, each facing a like-named external field-magnet pole. Hence the passing armature bobbins are exposed to strongly magnetized polo pieces inside as well as outside, thereby utilizing also the inner parts of the wire bobbins. The internal magnet is made for larger sized motors, and may be taken out and the motor runs without it. On top of the machine are two binding posts, mounted on a block of wood, to which the mains are connected. All the iron in this motor is best soft wrought-iron. no cast-iron being employed. All parts are carefully proportioned for lightweight, high efficiency, and strength. In case the armature should require repairing, the bobbins need not be unwound, as in some other machines, but any one may be slipped off its section after taking out the nearest bolt, thus saving time, labor, and material. The motor exhibited in Philadelphia was of 1½ actual horsepower, and weighed 106 lbs. Its bulk was likewise exceedingly small. The motor measured in height 9½ in., width 16½ in., and length of shaft 20½ in. |
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1895 Article-W. H. Allen & Co., Reckenzaun Electric Motor
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