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bldc

Open source brushless direct current (permanent magnet alternating current) hardware and software.

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bldc's Issues

Incorrect Phase Angle Estimation

#ifdef PHASE_PREDICTION
uint16_t currentTimerCount = motorSpeedTimerOverrun ? TIM13_PERIOD : TIM13->CNT;
uint16_t estimatedPhasePrediction = (((uint32_t)currentTimerCount * 100 * 60) / motorSpeedCount) / 100;
#else
uint16_t estimatedPhasePrediction = 60;
#endif
int16_t quadratureAxisAngle = checkAngleOverflow(directAxisAngle + 60 + estimatedPhasePrediction);

The above code incorrectly drives the quadrature angle 60 degrees ahead of the direct angle when PHASE_PREDICTION is enabled. To fix this issue the below changes are recommended:

#ifdef PHASE_PREDICTION
    uint16_t currentTimerCount = motorSpeedTimerOverrun ? TIM13_PERIOD : TIM13->CNT;
    uint16_t predictedPhaseAngle = (((uint32_t)currentTimerCount * 100 * 60) / motorSpeedCount) / 100;
#else
    // half of the hall effect resolution, so that active torque region is centered around max torque point
    uint16_t predictedPhaseAngle = 30; 
#endif


    int16_t quadratureAxisAngle = checkAngleOverflow(directAxisAngle + 90 + predictedPhaseAngle);

Polarity Issue

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
/* Set Idle state to Reset for all FETs, so break can be used for neutral */
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;

Let's give the below configuration a try and see if it gets us what we want.

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low;
/* Set Idle state to Reset for all FETs, so break can be used for neutral */
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;

Wrong period

timerPeriod = (uint16_t)(((uint32_t)SystemCoreClock / 2 / PWM_FREQ_HZ) - 1);

should be

timerPeriod = (uint16_t)(((uint32_t)SystemCoreClock / PWM_FREQ_HZ) - 1);

This is to account for the fact that we are no longer doing center aligned mode.

Wrong Polarity

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low;

should be

TIM_OCStruct.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCStruct.TIM_OCNPolarity = TIM_OCNPolarity_High; 

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