User’s Manual for Advanced Axial Flux Synchronous Motors and Generators
www.emrax.com Version 4.5 / January 2017 40
Magnetic field weakening can be set in the controller software. EMRAX motors have 10 pole pairs, therefore it is recommended
to weaken the magnetic field 15-20% to achieve the best performance. With higher % of magnetic field weakening the motor
can run faster with very good efficiency, which drops only for 1, 5% at 80% MFW. We recommend MFW only for a short time
(few min in case of full motor power), because of a very high current phase between the motor and controller.
!Note:
- Maximal motor RPM should not be exceeded. Maximal motor RPMs are listed in the Technical Data Tables for each motor type.
- EMRAX motor has 10 pole pairs, which results in very high motor rotation frequency, especially at higher motor speed.
Therefore the controller for an EMRAX motor has to be made for high rotation frequencies.
For example: at 6000 RPM the rotation frequency is 1000 HZ. Consequently, the controller must deliver a stable and smooth
signal even at a high rotation frequency with high PWM. .
10. Two same sized EMRAX motors connected serially (EMRAX TWIN) – stacking capability
of EMRAX motors
Two same sized EMRAX motors can be connected serially – this is EMRAX TWIN. All EMRAX motor types can be connected into
TWIN.
Figure 33: EMRAX TWIN drawing
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