Foundations - WEG W22 Premium E3 Manual De Instalación, Operación Y Mantenimiento

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8.Additional recommendations:
a. Check the direction of motor rotation, starting the motor at no-load before coupling it to the load.
b. Vertical mounted motors with shaft end down must be fitted with drip cover to protect them from liquids
or solids that may drop onto the motors.
c. Vertical mounted motors with shaft end up must be fitted with water slinger ring to prevent water
penetration inside the motor.
Remove or fix the shaft key before starting the motor.

6.1. FOUNDATIONS

The foundation is the structure, structural element, natural or prepared base, designed to withstand the
stresses produced by the installed equipment, ensuring safe and stable performance during operation. The
foundation design should consider the adjacent structures to avoid the influences of other installed equipment
and no vibration is transferred through the structure.
The foundation must be flat and its selection and design must consider the following characteristics:
a) The features of the machine to be installed on the foundation, the driven loads, application, maximum
allowed deformations and vibration levels (for instance, motors with reduced vibration levels, foot flatness,
flange concentricity, axial and radial loads, etc. lower than the values specified for standard motors).
b) Adjacent buildings, conservation status, maximum applied load estimation, type of foundation and fixation
and vibrations transmitted by theses constructions.
If the motor is supplied with leveling/alignment bolts, this must be considered in the base design.
Please consider for the foundation dimensioning all stresses that are generated during the operation
of the driven load.
The user is responsible for the foundation designing and construction.
The foundation stresses can be calculated by using the following equations (see Figure 6.2):
Where:
F and F = lateral stresses (N);
1 2
g = gravitational acceleration (9,8 m/s
m = motor weight (kg);
T = breakdown torque (Nm);
b
A = distance between centerlines of mounting holes in feet or base of the machine (end view) (m).
The motors may be mounted on:
Concrete bases: are most used for large-size motors (see Figure 6.2);
g
Metallic bases: are generally used for small-size motors (see Figure 6.3).
g
F
1
F
2
Figure 6.2 – Motor installed on concrete base
90 Manual of Electric Motors
F = 0,5 * g * m – (4 * T
1
F = 0,5 * g * m + (4 * T
2
);
2
F
1
A
F
2
/ A)
b
/ A)
b
Figure 6.3 – Motor installed on metallic base