DIN EN IEC 60034-2-3:2026-03

Among other things, this document covers the following scope and essential requirements: This part of IEC 60034 specifies test methods and an interpolation procedure for determining losses and efficiencies of converter-fed motors. The motor is then part of a variable frequency power drive system (PDS) as defined in IEC 61800-9-2. Applying the approach of the comparable converter, the motor efficiency determined by use of this document is applicable for comparison of different low voltage motor designs only. The comparable converter approach is not applicable to medium voltage motors. This document also specifies procedures to determine motor losses at any load point (torque, speed) within the constant flux range (constant torque range, base speed range), the field weakening range and the overload range based on determination of losses at seven standardized load points. This procedure is applicable to any variable speed AC motor (asynchronous and synchronous) rated according to IEC 60034-1 for operation on a variable frequency and variable voltage power supply. Among other things, this document specifies the following restrictions on the scope of application: the 2-3-B method (summation of losses with determination of the additional harmonic losses when the motor is driven by a converter at no load) is not applicable to all types of electric machines. This method is also not intended for determining the seven load points. Among other things, the document covers the following typical application examples: - test methods for determining the efficiency of converter-fed motors; - method 2-3-A; - direct measurement of power input and output; - method 2-3-B; - summation of losses with determination of additional harmonic losses during converter-fed no-load operation; - method 2-3-C; - alternative method for determining efficiency (AEDM); - method 2-3-D; - determination of efficiency through calculation; - interpolation of motor losses for any operating point.