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IEC 60034-30 specifies energy-efficiency classes for single-speed, continuous duty(S1), three-phase, cage-induction motors with 2, 4 or 6 poles. It classifies three classes: IE1 (standard), IE2 (high) and IE3 (premium). For each class the efficiency is defined for a rated output range from 0.75 to 375 kW.
Induction motors using a squirrel-cage rotor winding may have the rotor bars skewed slightly to smooth out torque in each revolution. Standardized NEMA & IEC motor frame sizes throughout the industry result in interchangeable dimensions for shaft, foot mounting, general aspects as well as certain motor flange aspect.
Squirrel-cage induction motors are very prevalent in industry, in sizes from below 1 kilowatt (1.3 hp) up to tens of megawatts (tens-of-thousand horsepower). They are simple, rugged, and self-starting, and maintain a reasonably constant speed from light load to full load, set by the frequency of the power supply and the number of poles of the ...
IEC 60252 AC motor capacitors; IEC 60254 Lead-acid traction batteries; IEC 60255 Measuring relays and protection equipment; IEC 60258 Direct acting recording electrical measuring instruments and their accessories; IEC 60261 Sealing test for pressurized waveguide tubing and assemblies; IEC 60263 Scales and sizes for plotting frequency ...
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'.
These sizes are grouped by rated current and power. [1] [2] NEMA size ... Motor starter; References This page was last edited on 20 June 2020, at 20:42 (UTC ...
IEC Standards that are not jointly developed with ISO have numbers in the range 60000–79999 and their titles take a form such as IEC 60417: Graphical symbols for use on equipment. Following the Dresden Agreement with CENELEC the numbers of older IEC standards were converted in 1997 by adding 60000, for example IEC 27 became IEC 60027 ...
The enclosure is a frame housing the ... rated according to IEC 60947-5-1: ... horsepower for attached induction motors. NEMA standard contactor sizes are designated ...