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Bafang RG A510.S.D 2023 5 315.7% 3700g eFat Bafang RG A310.S.D 2022 3 165.1% 80 Nm 1700g eCity / eTour 3x3 Nine 2022 9 554% 250 Nm 2000g eMTB, heavy cargo, commuter Brompton: BSR (fork from Sturmey Archer) 3 178% ? g City Brompton BWR [1] [2] 2009 3(x2) 246% (302%) 940 g City Enviolo City 2019 continuous 310% 250 W 55 Nm n/a 2450 g [3] City Enviolo
A much larger capacity VFR model, the VFR1200F, was revealed at the Tokyo Motor Show in October 2009. [3] [4] The new 1,200 cc (73 cu in) narrow-angle SOHC V4 engine [5] does not use the V-Tec design of the smaller VFRs. It has an optional six-speed push-button operated dual clutch transmission with three modes: automatic, sport and manual.
is the resistive power loss (SI unit: watt) The motor constant is winding independent (as long as the same conductive material is used for wires); e.g., winding a motor with 6 turns with 2 parallel wires instead of 12 turns single wire will double the velocity constant, , but remains unchanged.
Nameplates on electrical motors show their power output, not the power input (the power delivered at the shaft, not the power consumed to drive the motor). This power output is ordinarily stated in watts or kilowatts. In the United States, the power output is stated in horsepower which, for this purpose, is defined as exactly 746 watts.
For electrical motors, a similar kind of information is conveyed by the service factor, which is a multiplier that, when applied to the rated output power, gives the power level a motor can sustain for shorter periods of time. The service factor is typically in the 1.15-1.4 range, with the figure being lower for higher-power motors.
A fractional-horsepower motor (FHP) is an electric motor with a rated output power of less than one horsepower (745.7 W) (the term 'fractional' indicates less than one unit). 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'.
In terms of electromagnetism, one watt is the rate at which electrical work is performed when a current of one ampere (A) flows across an electrical potential difference of one volt (V), meaning the watt is equivalent to the volt-ampere (the latter unit, however, is used for a different quantity from the real power of an electrical circuit).
As an example, a 250 kVA motor–generator operating at 300 ampere of full load current will require 1550 ampere of in-rush current during a re-closure after 5 seconds. This example used a fixed mounted flywheel sized to result in a 1 ⁄ 2 Hz per second slew rate. The motor–generator was a vertical type two-bearing machine with oil-bath ...