OVMS User Manual page 30

OVMS: Renault Twizy User Guide
Renault specs the Twizy 80 with continous power of 8 kW, peak 13 kW and torque of 57 Nm.
According to the motor label it's specified at 12 kW for 1 minute (IEC S2 = short-time duty cycle).
The most similar generally available motor from Letrika seems to be the AMV7122 contained in
their L7e conversion kit:
http://www.letrika.com/katalog/basic.html?lang=E&tab=0&koda=IM7043
The PDF specsheet for the conversion kit says it's also rated at 12 kW nominal power for 1 minute
and can do a maximum power output of 15 kW for 30 seconds, and a maximum torque of 70 Nm at
400 A and a maximum speed of 8.000 rpm.
Controller
The Twizy motor controller is a SEVCON Gen4™, a masterpiece of current AC controller
technology:
http://www.sevcon.com/ac-controllers/gen4%E2%84%A2.aspx
The controller can be configured using the standard SEVCON DVT (or older DriveWizard)
software package or any CANopen configuration/monitoring software and a standard CAN bus
controller... oh, or using the OVMS of course ;-)
To be able to make a complete backup of your controller configuration, you currently need to use
the SEVCON DVT software. The OVMS cannot store a backup due to lack of memory.
There are two command classes, low level and macro.
If you want to dig deep, please read the Gen4 Product Manual first to understand the basic
principles of operation and features of the controller. Especially chapters 5 (System design) and 6
(Configuration) will provide valuable information. You should also read through the DVT software
manuals and help system.
If you're in a hurry, the OVMS provides some useful macro commands for the most common basic
configuration tweaks. These should need no backup as they provide "reset" commands – but you
never know.
Gear box
The Twizy uses a generally available differential gear box with two-stage of reduction and parallel
axes created by COMEX S.p.A. Italy. Specsheet can be downloaded from here:
http://www.comexspa.com/index.php/en/products/item/38-differential-gearboxes
There are two oddities about this.
The gearbox is specified with max output torque of 1000 Nm. Considering that the Twizy 80 has a
ratio of 9.23:1 (Twizy 45: 13.4:1), this means the maximum input torque can be as high as 1000 /
9.23 = 108.34 Nm (Twizy 45: 74.63 Nm), so there's lots of headroom for tuning on the torque side.
30 / 77
2019/05/02 RT3.9.1