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Title: |
1909 Article-Allis-Chalmers Co., Type K, D. C. Electric Motor |
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Source: |
Cyclopedia of Applied Electricity, 1909 pgs 424-425 |
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Insert Date: |
2/10/2023 10:11:11 AM |
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Allis-Chalmers Company — The larger constant-speed motors of this company employ the same frames as their belted generators shown in Fig. 16. They include many sizes at 120, 240, and 500 volts from 10 to 550 horse-power, ranging in speed from 1,050 to 230 R. P. M. Their type K machine, shown in Fig. 69, is built in 13 different frame sizes with a number of ratings for each frame, depending upon the winding and the speed. The smallest shunt-wound constant-speed size in the 120-volt line is 1/8 H. P. at 1,600 R. P. M., and the largest is 80 H. P. at 500 R. P. M. They are also wound for 240 and 500 volts. They can be used as adjustable-speed motors with a range in speed of 1 to 3. They also can be wound as any type compound or series motors, thus becoming varying-speed motors. The field-magnet yoke is of open-hearth steel and machined on the end to receive the housings that carry the bearings. The housings, held in place by through bolts, can be rotated 90 or 180 degrees. This allows bipolar machines to be mounted on floor or ceiling and 4-pole machines to be mounted on floor, ceiling, or side wall. Fig. 70 shows an Allis-Chalmers type K motor mounted on a planer. Standard motors of this type are made open at the ends; they can, however, also be made semi-enclosed and totally enclosed by the addition of suitable metal enclosing covers fitted to the end housings. The semi-enclosed type uses perforated covers forming a screen that, while allowing a circulation of air, protects the motor from flying particles. Totally enclosed motors are dust and moisture proof. This shuts off the ventilation, and the output of a given frame is less for the totally enclosed type than for the others. The enclosed motor does well, however, for intermittent work where it has ample time to cool in the intervals of work. This company also manufactures a line of railway motors of 35-, 50-, and 75-H. P. capacities to be used on circuits from 500 to 650 volts. Fig. 71 illustrates the 35-H. P. size thrown open. The cast-steel field frame is in two parts, divided horizontally through the bearings. This motor is of the series, 4-pole type, dust and moisture proof. |
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1909 Allis-Chalmers Co., Type K, D. C. Electric Motor
1909 Allis-Chalmers Co., Type K, D. C. Electric Motor on Metal Planer
1909 Allis-Chalmers Co., D. C. Railway Electric Motor
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