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Title: |
1895 Article-Crocker-Wheeler Electric Co., Electric Motor & Fan |
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Source: |
Modern Mechanism 1895 pg 551 |
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Insert Date: |
9/15/2011 12:58:37 PM |
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Fig. 40 gives a view of the standard Crocker- Wheeler motor. The machine is of the inverted horseshoe type; each pole piece is continuous with its magnetic core, of soft iron, drop forged exactly to its finished shape. These forgings are fitted into recesses in the main casting of the motor that forms at once the magnet yoke and the support for the bearings. The armature is relatively of very large diameter, and, compared to the field, quite powerful. The armature is a Pacinotti ring with a comparatively small amount of wire wound upon it. The clearance of the armature is so small that the magnetic resistance of the air gap is exceptionally low, and the coils, sunk flush with the surface of the armature, are subjected to a very powerful induction. This construction, too. Gives almost complete immunity from burning out of the armature, as each section is isolated, and no two contiguous wires are subjected to any considerable difference of potential. A little Crocker-Wheeler fan motor is shown in Fig. 41. It carries, usually, a 12-in. fan, and has come into very extensive use in offices, restaurants, and the like. On its pole piece will be noticed a starting switch, which is supplied to all the small motors for starting and stopping, and in some cases for regulating. This switch, when turned, first charges the field, then starts the armature through a resistance wound on the machine, and finally cuts out the resistance and gives the full current to the armature. |
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1895 Crocker-Wheeler Electric Co., Electric Motor
1895 Crocker-Wheeler Electric Co., Electric Fan
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