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Harbor Freight Tools won a declassification of the class action; that is, the court found that all the individual situations were not similar enough to be judged as a single class, and that their claims would require an individual-by-individual inquiry, so the case could not be handled on a class basis.
Small DC motors are used in tools, toys, and appliances. The universal motor, a lightweight brushed motor used for portable power tools and appliances can operate on direct current and alternating current. Larger DC motors are currently used in propulsion of electric vehicles, elevator and hoists, and in drives for steel rolling mills.
For certain types of electric motors or generators to function, the coils of the rotor must be connected to complete an electrical circuit. Originally this was accomplished by affixing a copper or brass commutator or 'slip ring' to the shaft, with springs pressing braided copper wire 'brushes' onto the slip rings or commutator which conduct the current.
A brushless DC electric motor (BLDC), also known as an electronically commutated motor, is a synchronous motor using a direct current (DC) electric power supply. It uses an electronic controller to switch DC currents to the motor windings producing magnetic fields that effectively rotate in space and which the permanent magnet rotor follows.
DeWalt – power tools; B & D acquired in 1960; Guoqiang (GQ) Tools (China) – power tools; Porter-Cable – power tools; B & D acquired in 2004 [34] /2005 [35] Oldham Saw Company – circular saw blade and wood router bit products; B & D acquired in 2004 [34] Black+Decker – acquired (via merger) in 2010; Craftsman – acquired from Sears ...
In the early years of generator development, the stator field went through an evolutionary improvement from a single bipolar field to a later multipole design. Bipolar generators were universal prior to 1890 but in the years following it was replaced by the multipolar field magnets. Bipolar generators were then only made in very small sizes. [1]
A gas generator is a chemical device that burns to provide a supply of gas under pressure. Although still hot, comparable to rocket motor exhaust, this gas can be cooler and cleaner of particulates than rocket efflux. [3] Both solid and liquid-fuelled gas generators may be used. [3] Advantages of a gas generator drive, rather than motor exhaust ...
Yet, the engine ran for 1 hour and 45 minutes, and generated a thrust of 480 pounds-force (2,100 N) at 13,000 rpm. Another W.U. engine reconstruction was started on 30 May 1938, but using ten combustion chambers to match the ten compressor discharge ducts. Avoiding a single large combustion chamber made the engine lighter and more compact.
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