ROTATING ELECTRICAL MACHINES
Part 31: Guide for the selection and application of energy-efficient motors including variable-speed applications
This part of IEC 60034 provides a guideline of technical aspects for the application of energy- efficient, three-phase, electric motors. It not only applies to motor-manufacturers, OEMs
(original equipment manufacturers), interested parties.
legislators but to all other
This guide is applicable to all electrical machines covered by IEC 60034-30. Most of the information however is also relevant for cage-induction machines with output powers exceeding 1 MW.
The following referenced document is indispensable for the application of this document.
IEC 60034-30, Rotating electrical machines — Part 30: Efficiency classes of single-speed three-phase cage induction motors (IE-code)
Terms, definitions and symbols
Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60034-1 and the following apply.
Brake motor A motor equipped with an electro-mechanical brake unit mounted directly on the motor shaft without couplings.
Geared motor A motor directly attached to a gearbox without couplings (i.e. the first gear wheel is fixed to or integral with the motor shaft).
Nominal efficiency The efficiency value required in order to meet a certain efficiency class according to the IE efficiency tables.
Average efficiency The average of efficiency values for a population of devices of the same design and rating.
Minimum efficiency The rated efficiency as declared by the manufacturer minus the tolerance according to IEC 60034-1. This efficiency value is guaranteed by the manufacturer for any given individual motor of a large population.
Rated efficiency The efficiency value assigned by the manufacturer, equal or higher than the nominal efficiency of the rated efficiency class .