International Library of Technology · Scranton, International Textbook Co. · leaf 257
would be too low tooperate arc or incandescent lamps in a satisfactory manner.High-frequency current may be obtained from low-frequencyby using a low-frequency motor to drive a high-frequencydynamo or by using a frequency changer. Fig. 35 shows a frequency changer of a type used in con-nection with… … Fig. 35. led into the stationary field winding of B, and the high-frequency current is taken from the armature of B by meansof the collecting rings C. The armature of an inductionmotor always revolves at a slightly lower speed than themagnetism set up by the field windings, the difference inspeed…
Electrical engineering
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