User’s Manual for Advanced Axial Flux Synchronous Motors and Generators
www.emrax.com Version 4.5 / January 2017 47
extremely important. Due to adequate fixation of the magnets and quality advanced materials as well as motor design, EMRAX
motors can be rotated even up to 8000 RPM (EMRAX 188 and 208 types).
The generator voltage of EMRAX may vary for 1-2% at the same rotation speed. This is due to the difference of the magnetic
field of the magnets (tolerance 1-2%). The difference in voltage also depends on the other materials of the motor.
16. EMRAX motor bearings and life expectancy
Bearings of the rotor are not qualified for forces higher than bearings of the EMRAX motors included can transfer. Bearings used
are FAG or SKF models, which are listed in the Technical Data Tables for every EMRAX type and in Item 3. All technical
information about listed bearings is publicly available.
Every EMRAX motor includes two bearings – front and back. The distance between the front and back bearing can be measured
from drawings. The bearing type depends on the load (direction and amplitude of the force applied on the motor shaft).
Bearings for EMRAX motors are listed in the tree structure of Item 3 and in the table below this paragraph. Bearing types, which
are described, are used for most applications. If special bearings are needed (e.g. for in-wheel application), customer must
consult with the EMRAX technical support before placing an order. Bearings are mounted in the motor during motor assembly.
The bearing type must be calculated and selected by customer.
* Front bearing is for radial forces. Back bearing is for axial-radial forces, focusing on very high axial load. Bearing combination is
for pull mode. Suitable for e.g. air propeller.
** Front bearing is for radial forces. Back bearing is for axial-radial forces. Bearing combination is for pull-push mode.
Figure 43: Combinations of bearings for EMRAX motors
To choose the correct bearings, the calculator on the link below should be used. Size of the bearing must be correct (according to
EMRAX motor drawings). We offer FAG and SKF bearings.
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