Description of "Varispeed" drive manufactured by Electric Construction Co using standard d-c motor supplied from a-c mains through mercury arc rectifier; speed can be varied over very wide range, as much as 1000 to 1, providing constant torque throughout this speed range; typical installation depicted shows 267-hp shunt wound d-c motor driving automatic drawbench.
Variable-speed power drive
Engineer
Engineer ; 182 , n 4739
1946
2 pages
Article (Journal)
English
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European Patent Office | 2023
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