brushless dc motor - Question about Intermittent Torque Zone and Rated Voltage - Electrical Engineering Stack Exchange

In the below two diagrams, the Intermittent Torque Zones are different, figure 1 is triangle and figure 2 is rectangle. I don't know which one is correct, is there something related to motor's rated

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Brush Less Dc Motor

brushless dc motor - Question about Intermittent Torque Zone and Rated Voltage - Electrical Engineering Stack Exchange

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What will be the maximum speed if I use a 3,000 watts BLDC motor in place of the current 1,000 watts motor which peaks 2,500 watts on a 72V 45Ah battery n