Motor Description
1.10 Mounting
1PH7/1-34
Siemens AG, 2004. All rights reserved
Induction Motors, 1PH7 (APH7S) – 05.04 Edition
!
Caution
Liquid must be prevented from collecting at the flange – both for vertical as well as
horizontal mounting positions. If liquid is not prevented from collecting, then it can
be assumed that it will enter the inside of the motor.
Notice
1PH7 main spindle motors are force-ventilated. When mounting the motors, it
must be ensured that the motor can be well ventilated. This is especially true when
mounting the motors in enclosures. It is not permissible that the hot discharged air
is drawn in again.
Notice
Motors must be carefully mounted on adequately stiff foundations or bedplates.
Additional elasticities of the foundation/bedplates can result in resonance effects of
the natural frequency at the operating speed and therefore result in inadmissibly
high vibration values.
The magnitude of the natural frequency when the motor is mounted depends on
various factors and can be influenced by the following points:
Mechanical transmission elements (gearboxes, belts, couplings, pinions, etc.)
Stiffness of the machine design to which the motor is mounted
Stiffness of the motor in the area around the foot or customer flange
Motor weight
Machine weight and the weight of the mechanical system in the vicinity of the
motor
Damping properties of the motor and the machine tool
Mounting type, mounting position (IM B3; IM B5; IM B35; IM V1; etc.)
Motor weight distribution, i.e. length, shaft height
After the motors have been mounted, the caps for the screw holes in the mounting
feet must be re-located.
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