IEC 60034-2-3:2020 pdf free download – Rotating electrical machines
1 Scope
This part of lEC 60034 specifies test methods and an interpolation procedure for determininglosses and efficiencies of converter-fed motors within the scope of lEC 60034-1:2017.Themotor is then part of a variable frequency power drive system (PDS) as defined inlEC61800-9-2:2017.
Applying the approach of the comparable converter, the motor efficiency determined by use ofthis document is applicable for comparison of different motor designs only.
The document also specifies procedures to determine motor losses at any load point (torque,speed) within the base speed range (constant torque range，constant flux range) based ondetermination of losses at seven standardized load points.This procedure is applicable to anyvariable speed AC motor (induction and synchronous) rated according to lEC 60034-1:2017 foroperation on a variable frequency and variable voltage power supply.
2Normative references
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references, only the edition cited applies.For undated references,the latest edition of the referenced document (including anyamendments) applies.
IEC 60034-1:2017,Rotating electrical machines – Part 1: Rating and performance
IEC 60034-2-1:2014,Rotating electrical machines – Part 2-1: Standard methods fordetermining losses and efficiency from tests (excluding machines for traction vehicles)
IEC 61000-2-4:2002, Electromagnetic compatibility(EMC) – Part 2-4: EnvironmentCompatibility levels in industrial plants for low-frequency conducted disturbances
IEC 61800-9-2:2017,Adjustable speed electrical power drive systems – Part 9-2:Ecodesign forpower drive systems，motor starters, power electronics and their driven applications – Energyefficiency indicators for power drive systems and motor starters
3.1 motor losses with converter supply
when powered by a converter, motor losses are a combination of losses caused by fundamentalfrequency and losses caused by the converter high frequencies
3.2 fundamentallosses
fundamental losses in the motor can be segregated into five different components: iron losses(varying with motor frequency and applied fundamental voltage), friction and windage losses(varying with motor speed), rotor winding losses,stator winding losses and additional loadlosses (all three varying with motor current).Fundamental losses are the losses of a motorrunning with application of rated voltage at fundamental frequency that does not contain anyfurther high frequencies.
3.3 additional high frequency losses
additional high frequency losses are produced in the motor by the non-sinusoidal voltage andcurrent waveforms generated by the converter and are in addition to the losses of iron, frictionand windage, rotor winding, stator winding and additional load loss (fundamental losses)
3.4 base speed range
speed range from standstill up to the highest speed where the motor can be supplied with avoltage that changes in proportion to the speed so that the magnetic flux remains constant(constant ratio ul/) for induction machines and according to the MTPA (maximum torque perampere) for synchronous machines. Within the base speed range, the maximum motor torqueis constant (constant torque range), if constant flux control is used.