User’s Manual for Advanced Axial Flux Synchronous Motors and Generators
www.emrax.com Version 4.5 / January 2017 42
Possibilities for mounting the sensors in case of EMRAX TWIN:
- In case using ESO in the second motor both motors should use hall sensors.
- Tandem resolver (TLTN) or encoder can be mounted at the end of tailored elongated shaft (adapter shaft) after the drive wheel
(for pulley, chain etc.) on the back or front motor side (on ESO or FSI) by a tailor made bracket. Tailored shaft and bracket have
to be provided by a customer.
- Special tandem resolver or encoder with bigger internal diameter of the rotor can be mounted on the ESO. These special
sensors* have to be provided by a customer.
* Resolvers / encoders with bigger inner diameter of the rotor are bigger and a lot more expensive. These bigger sensors also
need more space for mounting.
The first motor is connected to the second motor by using the ESO shaft, FSI shaft and two X shape brackets. ESO and FSI shaft
must be made by the EMRAX Company, otherwise the warranty does not apply.
Figure 37: EMRAX TWIN shafts – ESO is mounted in the first motor and FSI on the front side of the second motor
Figure 38: Motor with extended shaft and flanged shaft on the extended shaft (for EMRAX TWIN)
11. Redundancy
2 options:
- EMRAX TWIN, which needs to be driven with two controllers and needs a tandem resolver (TLTN) or hall sensors in every
motor. In case of one controller/motor failure the others are still working.
- One EMRAX motor can be driven with two controllers. In this case the EMRAX motor needs doubled phase connectors
(2xUVW). In case of one controller failure, the other still drives the motor (performances are lower). Sensors: tandem resolver
(TLTN) encoder if the controller can split the signal or doubled hall sensors.
Redundancy may be considered for airplane applications.
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