IEC 60034-30 pdf download – Rotating electrical machines – Part 30: Efficiency classes of single-speed, three-phase, cage-induction motors (IE-code)
This part of lEC 60034 specifies efficiency classes for single-speed,three-phase,50 Hz and60 Hz,cage-induction motors that:
have a rated voltage u up to 1 0oo v;
NOTE The standard also applies to motors rated for two or more voltages and/or frequencies.. have a rated output P between 0,75 kw and 375 kw;
have either 2,4 or 6 poles;
are rated on the basis of either duty type $1(continuous duty) or S3 (intermittent periodicduty) with a rated cyclic duration factor of 80 % or higher;
. are capable of operating direct on-line;
.are rated for operating conditions in accordance with lEC 60034-1,Clause 6.
Motors with flanges，feet and/or shafts with mechanical dimensions different fromIEC 60072-1 are covered by this standard.
Geared motors and brake motors are covered by this standard although special shafts andflanges may be used in such motors.
Excluded are:
.Motors made solely for converter operation in accordance with lEC 60034-25.
.Motors completely integrated into a machine (for example pump, fan and compressor) that
cannot be tested separately from the machine.
2Normative references
The following referenced documents are indispensable for the application of this document.For dated references,only the edition cited applies.For undated references, the latest editionof the referenced document (including any amendments) applies.
IEC 60034-1，Rotating electrical machines – Part 1: Rating and performance
IEC 60034-2-1，Rotating electrical machines – Part 2-1: Standard methods for determininglosses and efficiency from tests (excluding machines for traction vehicles)
IEC 60034-6,Rotating electrical machines – Part 6: Methods of cooling (Ic Code)
IEC 60072-1，Dimensions and output series for rotating electrical machines – Part 1: Framenumbers 56 to 400 and flange numbers 55 to 1080
e-
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.
3.1.1
brake motor
a motor equipped with an electro-mechanical brake unit operating directly on the motor shaftwithout couplings
3.1.2
geared motor
a motor directly attached to a gearbox without couplings (i.e. the first gear wheel is fixed tothe motor shaft)
3.1.3
pump motor
a motor directly attached to a pump without couplings (i.e. the impeller is fixed to the motorshaft)
3.1.4
average efficiency
the average efficiency value for a motor population of the same design and rating
3.1.5
nominal efficiency
the efficiency value required to meet a certain efficiency class according to the efficiencytables in this standard
3.1.6
rated efficiency
the efficiency value assigned by the manufacturer，equal to the nominal efficiency value orhigher
3.2symbols
is the nominal efficiency,%外is the rated efficiency,%
is the rated frequency,HznN
is the rated speed, min-1Pis the rated output power, kwTNis the rated output torque,Nmuis 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.
ln some countries，motors are built for a restricted space (high-output design， i.e. smallerframe 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 higherefficiency classes specification.
Motors specifically built for operation in explosive environments according to lEC 60079-0 arecovered by this standard.However,as a result of safety requirements and certain designconstraints of explosion proof motors (like increased air-gap，reduced starting current,enhanced sealing and others) some may not be able to achieve higher efficiencyclassifications.
NOTE 1 Due to the required certification processes additional time and cost may be necessary to achieve thehigher efficiency ratings for some of these motors.
Motors specifically designed
for special requirements of the driven machine (e.g. heavy starting duty，special
torque stiffness and/or breakdown torque characteristics，large number ofstartlstop cycles, very low rotor inertia);
for special characteristics of the grid supply (e.g. limited starting current，hightolerances of voltage and/or frequency);
for special ambient conditions (e.g. very high or low ambient temperature; smokeextraction motors, high altitudes of installation),
may not be able to achieve higher efficiency classifications.
NOTE 2 Regulators should consider the above constraints when assigning national minimum energy efficiencyperformance standards (MEPS).
5 Efficiency
5.1 Determination5.1.1 General
The efficiency shall be determined at rated output power Py, rated voltage U、 and ratedfrequency f,-
Efficiency and losses shall be determined in accordance with lEC 60034-2-1.
For lE1 (standard efficiency) and motors below standard efficiency, test methods associatedwith low and medium uncertainty are acceptable.The selected test method shall be stated inthe documentation of the motor.
IEC 60034-30 pdf download – Rotating electrical machines – Part 30: Efficiency classes of single-speed, three-phase, cage-induction motors (IE-code)
