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This paper introduces the basic fundamentals of proportional-integral-derivative (PID) control theory and the characteristics of each of the PID control loops.
The obsolescence of materials and processes in the manufacture of traditional DC brush gearmotors has necessitated the development of an upgraded DC brush gearmotor.
The Baldor Reliance RPM AC Cooling Tower Direct Drive Motor is designed exclusively for the cooling tower industry. This motor combines the technologies of the power-dense, laminated frame RPM AC motor with high performance, permanent magnet salient pole rotor designs.
The primary driver of an airport baggage handling queue conveyor must
be able to operate under increasingly demanding operating conditions, including frequent starting and stopping. The selection of the primary driver of the queue conveyor is dependent on multiple criteria, including dimensional requirements and durability characteristics.
While safety functions have been integrated into drives packages for some years now, the current trends are very exciting, from many angles. Today,
a full complement of safety functions can be implemented at the front-end of a system design on all types of production machines, including printing, packaging, converting,
materials handling and other equipment used throughout American industry.
In this special news section, the editors of Power Transmission Engineering have gathered the latest product news
and information from the gears and gear drives sector.
American Bearing Manufacturers Association (ABMA) Standard 9 and ISO 281 give equations for calculating
the basic dynamic radial load rating for ball bearings. These equations are based on a number of assumptions, many
of which are not valid for thin-section bearings. (Thin-section bearings are described in ABMA standard 26.2.)
Nevertheless, many thin-section bearing catalogs report load ratings based on these equations. Kaydon has developed a new method for calculating the dynamic radial load rating for thin-section ball bearings. The new method uses the contact stress and the number of stress-cycles-per-revolution to calculate the capacity. The new numbers are based on five years of actual test results. These equations can also be used to calculate the dynamic radial load rating for four-point contact ball bearings, which are not covered in ABMA standard 9 or ISO 281.
Suggesting a bicycle is environmentally
friendly is stating the obvious. But
the Copenhagen Wheel, unveiled at the
2009 COP15 United Nations Climate
Conference, is taking green technology
and cycling in a new direction.