IEC 60034-7:2020 pdf download

IEC 60034-7:2020 pdf download.Rotating electrical machines – Part 7: Classification of types of construction, mounting arrangements and terminal box position (IM Code)
1 Scope
This part of IEC 60034 specifies the IM 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 I (see Clause 4): – Code II (see Clause 5): An alpha-numeric designation applicable to machines with end- shield bearing(s) and only one shaft extension. An all-numeric designation applicable to a wider range of types of machines including types covered by Code I. The type of machine not covered by Code II is fully described in words. The relationship between Code I and Code II is given in Annex A.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses IEC Electropedia: available at http://www.electropedia.org/ ISO Online browsing platform: available at http://www.iso.org/obp 3.1 type of construction arrangement of machine components with regard to fixings, bearing arrangement and shaft extension [SOURCE: IEC 60050-411:1996, 411-43-34] 3.2 mounting arrangement orientation on site of the machine as the whole with regard to shaft alignment and position of fixings [SOURCE: IEC 60050-411:1996, 411-43-35]3.3 shaft extension portion of a shaft extending beyond an extreme bearing Note 1 to entry: The bearing may be on the machine itself or be part of an assembly comprising a machine and (an) additional bearing(s). [SOURCE: IEC 60050-411:1996, 411-43-07] 3.4 drive-end of a machine D-end that end of the machine which accommodates the shaft end Note 1 to entry: 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) b) Machine with two shaft extensions of different diameter: the end with the larger shaft diameter; Machine with a cylindrical shaft extension and a conical shaft extension of the same diameter: the end with cylindrical shaft extension; c) Machine with other arrangements: according to IEC 60034-8 if applicable; otherwise by agreement. Note 2 to entry: The outer diameter of a forged-on flange is taken to be the diameter of the shaft extension. [SOURCE: IEC 60050-411:1996, 411-43-36] 3.5 non-drive end of the machine N-end that end of the machine opposite to the drive end [SOURCE: IEC 60050-411:1996, 411-43-37]
4 Code I (alpha-numeric designation)
4.1 Designation of machines with horizontal shafts In Code I, a machine with a horizontal shaft is designated by the code letters IM (International Mounting), followed by a space, the letter B, one or two numerals as shown in Table 1 and an optional letter as shown in 4.3.
5 Code II (all-numeric designation)
Designation 5.1 In Code II, a machine is designated by the Code letters IM (International Mounting) followed by a space and four numerals. The first, second and third numerals designate aspects of construction (see 5.2 and 5.4).NOTE Rolling mill main motors can be used in a twin arrangement, where one of the upper/lower twin motors or the side-by-side twin motors drives the upper roll for the rolling mill, while the other drives the lower roll for the mill, so that the completely same speed control response for both twin motors can be obtained. 5.5 Terminal box location See the information of 4.3. 5.6 Examples of designations In Table 6 through Table 14, common types of construction and mounting arrangements are illustrated by sketches, and their designations are given using a particular fourth numeral. Other fourth numerals could be applicable (see Table 5). The absence of a sketch does not imply that a designation is not available. Numerals to which a significance has been allocated in the appropriate tables may be combined to form a valid designation. Some of these designations may be impracticable. 5.7 Inclination or declination of shaft Machines whose shaft orientation is other than horizontal (0°) or vertical (±90°) shall have their IM code followed by the appropriate angle designation referenced to the drive end, such as:IM1001 +7,5° (positive degrees always means DE-shaft up, i. e. inclination of shaft) IM7311 −7 ,5° (negative degrees always means DE-shaft down, i. e. declination of shaft). NOTE An inclination or declination may require special bearing design as the bearings carry an additional thrust load caused by the gravity force of the machine’s rotor.