New instrument monitors area gamma radiations

• Publisher: Elsevier Science
• Year: 1952
• Tongue: English
• Weight: 72 KB
• Volume: 253
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/0016-0032(52)90384-0

✦ Synopsis

ttigh-Accuracy Drive for Spinning Synthetic Yarn.--The General Electric Company has announced development of a new drive for spinning machines that is designed to provide greater uniformity of denier and dye-ability of synthetic yarns than ever before obtainable. This all a-c. drive insures uniformity through the most precise speed control (one-tenth of one per cent over a 7:1 speed range) ever obtained for spinning machines motors, according to G.E. engineers.

The system utilizes an electronically-regulated a-c. adjustable-speed motor, which drives a variable frequency alternator through a two-speed, herringbone gear box. The alternator output is delivered direct to small, synchronous motors on the spinning machine. These motors, in turn, provide direct drive to the machine positions, and eliminate troublesome and costly gearing, tapes, and line shafting.

Requiring only about two-thirds of the floor space needed for a comparable d-c. drive, the new system provides greater operational efficiency with fewer electric machines. Lower maintenance expenses and savings in power consumption are other major advantages.