ZHCSDA7G July 2014 – February 2018 DRV10983
The motor operation electrical period is automatically updated in register MotorPeriod1 and MotorPeriod2 while the motor is spinning. MotorPeriod1 is the MSB and MotorPeriod2 is the LSB. 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 d as tELE_PERIOD (µs) and is calculated as shown in Equation 9.
As an example consider the following:
MotorPeriod1 = 0x01;
MotorPeriod2 = 0xFF;
tELE_PERIOD = 512 (0x01FF) × 10 = 5120 µs
The motor electrical period and motor speed satisfies the condition of Equation 10.