Functioning VR rotational motion exciters have a spheroidal
cast iron body, within which two bearings support a shaft with eccentric
weights fitted at either end, generating the declared centrifugal force. Static
moment, thus centrifugal force, are adjustable by means of additional weight
inserts in steel or lead. Bearings are lubricated by oil bath, which must be
inserted by the end user. The typical application is with two VR exciters
coupled together by means of a cardan shaft, with each VR fitted at either side
of the machine. They are available in executions 1U and 2U, with one joint and
two joints respectively. The rotation of the shaft of the exciter with two
joints (2U) is obtained by means of an external drive, connecting to the shaft
by means of a joint, generally a cardan (recommended). The external drive can
be an electric motor, or hydraulic or other, to be connected directly to the
joint by means of belts and pulleys and can have variable speed in function of
the exciter specifications. Conformity to Directives In the application field
of the Machinery Directive 2006/42/EC, the VR rotational motion exciters can be
considered as “partly completed machinery”.
Static moment The total static moment of a pair of VR
exciters varies from 4294 to 73440 kgmm depending on the model. For each single
model the static moment can be set thanks to the additional steel or lead
inserts. Centrifugal force Up to 580 kN by pair of VR exciters. Ambient
temperature From -40°C to +70°C. Mounting position VR exciters can be mounted
with the shafts in horizontal position. Lubrication Oil bath lubricated
bearings. Each exciter is supplied without oil which has to be inserted by the
end user following relevant instructions as per Manual. Driving system The
movement is transmitted by an external driving system coupled to the shaft of
the 2U version VR by means of a joint, generally a Cardan (recommended).
