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NEMA (National Electrical Manufacturers Association) contactors and motor starters are rated by sizes. These sizes are grouped by rated current and power . [ 1 ] [ 2 ]
There is no defined minimum output, however, it is generally accepted that a motor with a frame size of less than 35mm square can be referred to as a 'micro-motor'. Fractional-horsepower electric motors are exempt from the US Energy Policy Act of 2005 and the new EN 60034-30:2009 [1] ruling of European directive 2005/32/EC [2] concerning the ...
A fractional-horsepower motor either has a rating below about 1 horsepower (0.746 kW), or is manufactured with a frame size smaller than a standard 1 HP motor. Many household and industrial motors are in the fractional-horsepower class.
Two common definitions used today are the imperial horsepower as in "hp" or "bhp" which is about 745.7 watts, and the metric horsepower as in "cv" or "PS" which is approximately 735.5 watts. The electric horsepower "hpE" is exactly 746 watts, while the boiler horsepower is 9809.5 or 9811 watts, depending on the exact year. [clarification needed]
The motor size constant and motor velocity constant (, alternatively called the back EMF constant) are values used to describe characteristics of electrical motors. Motor constant [ edit ]
These units were capable of 5,800 hp (4,300 kW) but had been rated at 4,600 hp (3,400 kW) and classified as CW46AHs. [citation needed] Union Pacific also had their 16-7HDL AC6000's repowered with FDL-16's, creating an entire fleet of 4,400-hp AC6000CWs. [4] Beginning in 2018, Union Pacific had begun sending its AC6000CWs to GE for rebuilding.
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