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  • IEC 60034-31:2009

  • 7–

ROTATING ELECTRICAL MACHINES

2/1554/CD

Part 31: Guide for the selection and application of energy-efficient motors including variable-speed applications

1 Scope

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.

end-users,

regulators,

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.

2 References

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)

3

Terms, definitions and symbols

3.1

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 .

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