Foot Mounted Motors; Flange Mounted Motors - WEG W22 Premium E3 Manual De Instalación, Operación Y Mantenimiento

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6.2.1. Foot mounted motors

The drawings of the mounting hole dimensions for NEMA or IEC motors can be checked in the respective
technical catalogue.
The motor must be correctly aligned and leveled with the driven machine. Incorrect alignment and leveling may
result in bearing damage, generate excessive vibration and even shaft distortion/breakage.
For more details, see section 6.5 and 6.6. The thread engagement length of the mounting bolt should be at
least 1.5 times the bolt diameter. This thread engagement length should be evaluated in more severe
applications and increased accordingly.
Figure 6.6 shows the mounting system of a foot mounted motor indicating the minimum required thread
engagement length.

6.2.2. Flange mounted motors

The drawings of the flange mounting dimensions, IEC and NEMA flanges, can be checked in the technical
catalogue.
The coupling of the driven equipment to the motor flange must be properly dimensioned to ensure the required
concentricity of the assembly.
Depending on the flange type, the mounting can be performed from the motor to the driven equipment flange
(flange FF (IEC) or D (NEMA)) or from the driven equipment flange to the motor (flange C (DIN or NEMA)).
For the mounting process from the driven equipment flange to the motor, you must consider the bolt length,
flange thickness and the thread depth of the motor flange.
If the motor flange has tapped through-holes, the length of the mounting bolts must not exceed the
tapped through-hole length of the motor flange, thus preventing damage to the winding head.
For flange mounting the thread engagement length of the mounting bolt should be at least 1.5 times the bolt
diameter. In severe applications, longer thread engagement length may be required.
In severe applications or if large motors are flange mounted, a foot or pad mounting may be required in addition
to the flange mounting (Figure 6.7). The motor must never be supported on its cooling fins.
Figure 6.7 - Mounting method of flange mounted motors with frame base support
Note:
When liquid (for example oil) is likely to come into contact with the shaft seal, please contact your local WEG representative.
92 Manual of Electric Motors
L = 1.5 x D
D
Figure 6.6 – Mounting system of a foot mounted motor