OVMS User Manual page 34

OVMS: Renault Twizy User Guide 2019/05/02 RT3.9.1
the maximum current level (see below). As this exceeds the default flux map, the flux map will be
extended to cover higher levels.
Power map / torque curve
The power map relates the available torque level to the motor speed. An AC motor will produce
constant torque up to the point of maximum power, from which on the torque needs to be scaled
down to maintain the power limit.
Physically there are basically three parameters for the map: maximum speed, maximum torque and
maximum mechanical power. There may also be an influence of nonlinearity of the motor
efficiency, i.e. if the motor needs nonlinear power input to produce mechanical output depending on
the speed.
To be able to produce a new power map closely resembling the original one and to enable
maximum flexibility for configuration, the POWER command allows to specify separate maximum
power levels for the beginning (low speed) and end (high speed) of the constant power range.
I have included a spreadsheet document called "Twizy Powermap Calculator" which produces a
power map from the four main parameters, which may be entered as needed by the CFG command.
The sheet includes the original Twizy power map and allows to compare both.
You may use the sheet to test the effects of speed, torque and power tweaks before applying them.
Here's an example comparing the original map to one for 90 kph, 120% torque and power ranging
from 100% to 110%:
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