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Hi sendler, given that motors have fixed iron losses in their stators they have peak efficiency bands just like gasoline engines. So even though you're putting more power through the motor and hence the heat losses are higher, it's actually more efficient (89.5% in my motor's case) to run at a higher amperage (13A) than the constant speed current required of 4A (where the efficiency is 84%). However, given that at a constant speed you're not expending additional energy accelerating and because the efficiency is pretty close anyways it works out better to maintain a constant speed.
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