OPERATION AND MAINTENANCE MANUAL
MAC QM MOTORS
PAGE: 24
CODE: CTT42 EDITION: 01 RELEASE: JULY 2016
Subject to technical changes without prior notice
3.6.5
Bearings
MAC QM motors include different bearings types depending on their frame size (shaft height). The table below summarises the
bearings considered standard for each of them:
Motor type
Bearing
n max
n
L10h
C
P max Fr max
rpm
rpm
h
N
N
N
MAC QM 315
D.E.
6240 M C3
2400
500
20000
270000
32012
32012
N.D.E.
6240 M C3
2400
500
20000
270000
32012
32012
Table 18: Bearings technical specifications of MAC-QM motors
N.D.E. = Rear / Non Drive End DE = Front /
Drive End
TERMINOLOGY:
max n = Maximum speed
n = Working speed
L10h = Bearing service life, in h
C = Rated dynamic load of bearing
max P = Admissible radial load on bearing for L10h and n
max Fr = Maximum radial force on pulley
Ball bearings without blanking plates. Must be greased regularly with KP2N-40 lithium soap-based grease according to DIN51825.
PRECAUTION
If the admissible loads are exceeded for the forces on the end of the shaft, damages may occur to the mounting parts and the
machine. Damages may also occur to the cylindrical roller bearings when the transversal forces are lower than the established
minimum.
Check the admissible loads according to the data given in the catalogue.
MAC QM motors carry two earth connection brushes to prevent problems caused by bearing currents. There is also the option
(on request) for incorporating SGR (Shaft Grounding Rings) bearing protection or shaft isolated bearing position.
A motor may need some type of special execution (considered as non-standard) that includes a bearing different to those
specified above. In said case, the customer must check with VASCAT to make sure that he has all the relevant information.
Summary of Contents for MAC QM
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