User’s Manual for Advanced Axial Flux Synchronous Motors and Generators
www.emrax.com Version 4.5 / January 2017 49
Figure 44: Pull-push (PP) bearing outer ring fixation
17. EMRAX motors as in-wheel motors
All EMRAX motor types can be used as in-wheel motors. Important considerations before placing an order are:
- Bearings selection according to forces applied on the shaft (torque, weight of the vehicle) – more information about bearings in
Item 16.
- Motor shaft selection according to forces applied on the shaft (torque, weight of the vehicle) – more information in Item 7.
EMRAX motor for in-wheel application must be totally closed (IP65; Liquid cooled).
For most in-wheel applications EMRAX 268 VHML is appropriate. In every case forces that will be applied to the shaft and
bearings should be discussed before placing an order.
In-wheel mounting options for EMRAX can be seen in Item 6.
18. Maintenance and protection of EMRAX motor against environmental disturbances
The drive does not need any maintenance during lifetime. The lifetime of EMRAX motors is the same as the lifetime of
the bearings that are included in each motor.
However it has to be considered that no foreign objects at all can enter the interior of the drive. This is especially
important for EMRAX motors with IP21 (Air Cooled and Combined Cooled). Furthermore, it is necessary to protect the
motor from humidity, dirt, paint, glues, salt, iron particles, etc. If this is ignored, a proper functionality of the motor
cannot be guaranteed and irreparable damages are possible. To prevent objects falling inside the motor (especially iron
chips, iron fillings), the motor ventilation holes (ring and side holes) MUST be protected with some tape during the
time the motor is being assembled into the system and during the time the drive is not in use. The drive must be
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