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

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