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

Analog to digital converter and assembly to normalize servo error signals and multiplex reference voltage inputs and digital outputs and optical drive system including same - Patent 0838811

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

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Measuring effective voltage and current across brushless DC motor - Electric motors & generators engineering - Eng-Tips

Big Data and Social Computing: 8th China National Conference, BDSC 2023, Urumqi, China, July 15–17, 2023, Proceedings 9819939240, 9789819939244