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BLDC motor BASE FREQ meaning?

sanket g
Prodigy 90 points
Other Parts Discussed in Thread: DRV8312

Hi

I am using the TI board DRV8312 with a hall sensored BLDC motor (24V, 4000 rpm)

In the Control Suite code, I saw following lines - 

#define BASE_FREQ 200 // Base electrical frequency (Hz)

and

speed1.BaseRpm = 120*(BASE_FREQ/POLES);
speed1.SpeedScaler = (Uint32)(ISR_FREQUENCY/(1*BASE_FREQ*0.001));

I would like to know the significance of the BASE FREQ value and on what basis do I change it.

Also I did not understand the formula used for the BaseRpm and SpeedScaler aprameters.

Can someone please explain me the same?

I will be changing the motor soon to a new one (say with maximum X rpm). What modifications do I need to do in the code for this?

Thanks,

Sanket