Mounting Options Of Emrax Motor For Electric Car - EMRAX 188 User Manual

For example, one EMRAX 228 motor can deliver 240 Nm peak torque and 120 Nm continuous torque.
Therefore peak torque on the wheels in first gear is:
���������� �������� ������������ ���� ��ℎ�� ��ℎ�������� ���� ���������� �������� = 12 ∗ 240 ���� = 2880 ����
In this case close to 3000 Nm of peak torque in first gear can be expected. In the second gear the
torque is lower. Only higher gear can deliver higher and finally end speed of EV.
End speed also depends on the maximal battery voltage (Vdc) and magnetic field weakening (MFW) –
more information in Item 9. Final EV speed can be even higher if magnetic field of the motor is
weakened. This can be done in the controller settings. Power stays the same at higher speed. Power
of EV is rising at higher speed because of the air drag.
EV needs enough high torque for starting EV and driving up the hill. 15% slope is minimal for torque
calculation.
3. Torque, power calculation:
At lower RPM (motor rotation), you can expect lower motor power at the same torque. At higher motor
speed you can expect higher motor power at the same torque.
Mt......torque [Nm]
P.........power [kW]
n.........motor rotation [RPM]
Very important considerations when calculation power and torque for EV:
- acceleration
- air drag at higher speed
- driving up the hill
Usually there is no need to add higher torque for climbing up the hill, because there is enough high torque in
the first gear in the case of using TG. Only EV speed is lower. Normally we do not need to drive up the hill at
full speed.
EV must start with good acceleration even at very low RPM or at zero speed. Therefore the most important
are motor torque and reduction drive ratio (belt drive, chain drive, differential or transmission gear etc.).

Mounting options of EMRAX motor for electric car:

- In-wheel (in Item 6)
- On the differential
- In the transmission gear (TG).
Firstly, you should know how much torque you need on the driven wheels.
www.emrax.com
User's Manual for Advanced Axial Flux Synchronous Motors and Generators
�� [����] = �� [������] ∗ ���� [����] / ��������
Version 4.5 / January 2017 54