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I am working on an electric go-kart, the only specs of the motor I have are:

Motor type: IPM, Operating voltage: 48V, Nominal power: 6kw, Peak Power: 8.5kw, Peak motor torque: 42Nm, Max rpm: 6700, Peak efficiency: >90%

I have come up with a li-ion battery pack for this motor. Now to do that i'm using optimum lap software which requires the torque and rpm curve of the motor (which i don't have for my motor).

I was thinking of using data from a similar IPM motor to perform the analysis. While looking at this and other IPM motor data-sheets the the torque and power have multiple curves namely peak, S2-5’ and S2-30’ which i don't understand (Here is other data-sheet that has something similar).

Also is this approach correct, or should I do it some other way?

The major issue i'm facing is how many cells should I add in parallel for a run time of 30-40 mins, i'm planning to use Molicel P45-B cells (data-sheet).

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1 Answer 1

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I take it to be thermally limited torque and power for 60, 30, and 5 minutes, respectively.
(And few seconds: instant.)
S2 should refer to the IEC Duty Cycle rating short time.

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