IEC 60034-7 pdf download – Rotating electrical machines – Part 7: Classification of types of construction, mounting arrangements and terminal box position (IM Code)
1.1Scope
This part of lEC 60034 specifies the lM Code，a classification of types of construction,mounting arrangements and the terminal box position of rotating electrical machines.
Two systems of classification are provided as follows:
– Code l (see section 2): An alpha-numeric designation applicable to machines with end-
shield bearing(s) and only one shaft extension.
– Code ll (see section 3): An all-numeric designation applicable to a wider range of types
of machines including types covered by Code l.
The type of machine not covered by Code ll should be fully described in words.
The relationship between Code l and Code ll is given in annex A.
1.2Definitions
For the purposes of this part of lEC 60034, the following definitions apply:
1.2.1
type of construction
the arrangement of machine components with regard to fixings，bearing arrangement andshaft extension
(IEV 60411-13-34)1)
1.2.2
mounting arrangement
the orientation on site of the machine as the whole with regard to shaft alignment and positionof fixings
(IEV 60411-13-35)
1.2.3
shaft extension
a portion of a shaft extending beyond an extreme bearing(IEV 60411-13-07)
NOTEThe bearing may be on the machine itself or be part of an assembly comprising a machine and (an)additional bearing(s).
1.2.4
drive-end of a machine (D-end)
that end of the machine which accommodates the shaft end(IEV 60411-13-36)
NOTE This is normally the driving end of a motor or the driven end of a generator.
Where for some machines the above definition is inadequate, the D-end is defined as follows:a) Machine with two shaft extensions of different diameter: the end with the larger shaftdiameter;
b) Machine with a cylindrical shaft extension and a conical shaft extension of the same
diameter: the end with cylindrical shaft extention;
c) Machine with other arrangements: according to lEC 60034-8 if applicable;otherwise by
agreement.
NOTE The outer diameter of a forged-on flange is taken to be the diameter of the shaft extension.
1.2.5
non-drive end of the machine (N-end)
that end of the machine opposite to the drive end(IEV 60411-13-37).
Section 2: Code l (alpha-numeric designation)
2.1Designation of machines with horizontal shafts
In Code l, a machine with a horizontal shaft is designated by the code letters lM(InternationalMounting), followed by a space, the letter B, one or two numerals as shown in table 1 and anoptional letter as shown in 2.3.
IEC 60034-7 pdf download – Rotating electrical machines – Part 7: Classification of types of construction, mounting arrangements and terminal box position (IM Code)
