IEC 60034-30 pdf download Rotating electrical machines – Part 30: Efficiency classes of single-speed, three-phase, cage-induction motors (IE-code)
3Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document,the terms and definitions given in lEC 60034-1 and thefollowing apply.
a motor equipped with an electro-mechanical brake unit operating directly on the motor shaftwithout couplings
a motor directly attached to a gearbox without couplings (i.e. the first gear wheel is fixed tothe motor shaft)
a motor directly attached to a pump without couplings (i.e. the impeller is fixed to the motorshaft)
the average efficiency value for a motor population of the same design and rating
the efficiency value required to meet a certain efficiency class according to the efficiencytables in this standard
the efficiency value assigned by the manufacturer,equal to the nominal efficiency value orhigher
is the nominal efficiency, %
is the rated efficiency, %
is the rated frequency, Hz
is the rated speed, min –1
is the rated output power, kW
is the rated output torque, Nm
is the rated voltage, V
4Fields of application (informative)
Motors covered by this standard may be used in variable-speed drive applications (seeIEC 60034-17). In such applications the rated efficiency of the motor should not be assumedto apply due to increased losses from the harmonic-voltage content of the power supply.
Motors with cooling methods other than ICOAx，IC1Ax，IC2Ax，IC3Ax or IC4Ax (seeIEC 60034-6) may not be able to achieve the higher efficiency classes specification.
In some countries, motors are built for a restricted space (high-output design, i.e. smaller frame sizes than usual in national standards). These motors are covered by this standard. However, as a result of the small frame-size they may not be able to achieve the higher efficiency classes specification.
Motors specifically built for operation in explosive environments according to IEC 60079-0 are covered by this standard. However, as a result of safety requirements and certain design constraints of explosion proof motors (like increased air-gap, reduced starting current, enhanced sealing and others) some may not be able to achieve higher efficiency classifications.