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Margaret Colvin improved the Triumph Rotary Washer, [12] which was exhibited in the Women's Pavilion at the Centennial International Exhibition of 1876 in Philadelphia. [13] At the same exhibition, the Shakers won a gold medal for their machine. [7] Electric washing machines were advertised and discussed in newspapers as early as 1904. [14]
A variable-speed drive (VSD) air compressor is an air compressor that takes advantage of variable-speed drive technology. This type of compressor uses a special drive to control the speed of the unit, which in turn saves energy compared to a fixed speed equivalent. [1]
In air conditioning, an inverter compressor is a compressor that is operated with an inverter. In the hermetic type, it can either be a scroll or reciprocating compressor . This type of compressor uses a drive to control the compressor motor speed to modulate cooling capacity.
Inverterization is the process of using an inverter-based motor drive intended to operate an electric motor at a variable speed for the sake of improved efficiency. [1] The main job of the inverter is to control the speed and torque of the motor to match work requirements.
A Belleville washer is a type of spring shaped like a washer. It is the shape, a cone frustum , that gives the washer its characteristic spring. The "Belleville" name comes from the inventor Julien Belleville who in Dunkerque , France, in 1867 patented a spring design which already contained the principle of the disc spring.
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