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  • IEC 60034-31:2009

  • 2–

2/1554/CD

CONTENTS

INTRODUCTION .....................................................................................................................6

7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8

Energy savings by speed control (variable speed drives VSD)...............................22 Correct sizing of the motor ....................................................................................22 Continuous duty application...................................................................................23 DC-injection braking ..............................................................................................23 Applications involving load cycling.........................................................................23 Applications involving extended periods of light load operations ............................24 Applications involving overhauling loads................................................................24 Applications where load-torque is increasing with speed (pumps, fans,

7.9

)

25

compressors

, … ................................................................................................... Applications involving frequent starts and stops and/or mechanical braking...........26

8

7.10 Applications involving explosive gas or dust atmospheres .....................................26 Economy ........................................................................................................................27

    • 8.1

      Relevance to users................................................................................................27

    • 8.2

      Initial purchase cost ..............................................................................................27

    • 8.3

      Operating cost .......................................................................................................28

    • 8.4

      Pay back time........................................................................................................29

    • 8.5

      Life cycle cost .......................................................................................................30

7

    • 6.1

      Starting performance .............................................................................................20

    • 6.2

      Operating speed and slip.......................................................................................21

    • 6.3

      Effects of Variation in Voltage and Frequency .......................................................21

    • 6.4

      Effects of Voltage Unbalance.................................................................................21

    • 6.5

      Effects of ambient temperature..............................................................................22

Applications....................................................................................................................22

6

    • 5.1

      Motor losses ..........................................................................................................10

    • 5.2

      Additional motor-losses when operated on a frequency converter..........................11

    • 5.3

      Motors for higher efficiency classes .......................................................................11

    • 5.4

      Variations in motor losses .....................................................................................12

    • 5.5

      Part load efficiency................................................................................................13

    • 5.6

      Efficiency testing methods .....................................................................................14

    • 5.7

      Power Factor .........................................................................................................15

    • 5.8

      Matching motors and variable speed drives ...........................................................16

    • 5.9

      Motors rated for 50 Hz and 60 Hz ..........................................................................17

    • 5.10

      Motors rated for different voltages or a voltage range ............................................18

    • 5.11

      Motors rated for operation at frequencies other than 50/60 Hz...............................18

    • 5.12

      Frequency Converter Efficiency .............................................................................19

    • 5.13

      Frequency Converter Power Factor .......................................................................20

Environment ...................................................................................................................20

1 2 3

Scope ...............................................................................................................................7 References .......................................................................................................................7 Terms, definitions and symbols.........................................................................................7

4 5

    • 3.1

      Terms and definitions ..............................................................................................7

    • 3.2

      Symbols ..................................................................................................................8

General ............................................................................................................................8 Efficiency..........................................................................................................................9

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