Lift off for braided drive shaft

Article Abstract:

Bentley-Harris Manufacturing Company of Lionville, Pennsylvania, owned by T&N of Manchester, has developed a technique for the manufacture of a wholly-composite integral drive shaft and coupling system for helicopters. Composites have distinct advantages over metals as they are lighter with a higher stiffness-to-weight ratio and figure strain capability and higher corrosion resistance. Combining shaft and couplings in a single unit using automated braiding fabrication techniques gives a lighter, simpler, cheaper, reliable and maintainable system. This technique can also be adopted in the manufacture of industrial machinery.

Noncurrent-carrying wiring devices, Gaskets, packing and sealing devices, Innovations, Machinery, Equipment and supplies, Helicopters, Couplings, Communications coupling assemblies, Bentley-Harris Manufacturing Co.

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Miniature electric motors

Article Abstract:

New developments are constantly being sought in the production of smaller and more powerful electric motors. New manufacturing methods and materials are the focus of research, with the main goal being the best trade-off between volume and power. The development of DC motors is being influenced by winding configuration, magnet materials and commutation. The newest material is neodymium ferrite boron, which, although cheap and efficient, suffers from the environment. Other developments that have influenced miniature motors include winding technology.

Product development, Miniaturization (Electronics), Motors, Electric motors

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Direct drive hydraulic motors

Article Abstract:

Hydraulic motors are very small in size as compared to electric motors, economical and flexible. They have very high starting torque, brakes, displacement shifting, freewheeling and can handle large external loads. Inertia due to hydraulic drives is very low and they can operate in both driving and braking mode. Research is going on to improve the design and working of hydraulic drives, particularly low-speed drives.

Design and construction, Hydraulic motors

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