SLVSD14A June 2017 – June 2020 DRV10983-Q1
The motor-operation electrical period is automatically updated in register MotorPeriod while the motor is spinning. The electrical period is measured as the time between calculated BEMF zero crossings for phase U. The electrical period of the motor is denoted as tELE_PERIOD (µs) and is calculated as shown in Equation 10.
As an example consider the following:
MotorPeriod = 0x01FF;
tELE_PERIOD = 512 (0x01FF) × 10 = 5120 µs
The motor electrical period and motor speed satisfies the condition of Equation 11.