Which Supply: 15v drive motor and 24v mower motor?

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As you might know from other posts I m trying to convert a Husqvarne automower 210c to an ardumower. Driver motors are working again with a maxon 24/2 brushless controller which can be connected to the arduino ( in the near future I hope).

These motors will run on 15v.but I would like to use the mower motor from the ardumower shop which runs on 24v. What should be the best solution:
1 Use another mower motor also on 15v?
2 use a 15v power supply and use a booster to generate 24v?
3 use a 24v power supply and use a converter to reduce it to 15v for the maxon motor drivers?

What would be the dis/advantages?

Thanks,

Geert
 
Oben