Hello all.
I want to know how to calculate the parameter for proper paramter to normal working.
I am testing with an MTRCKTSPNZVM128 EV board.
In the S12zvml mini-brd sample code, bldc is referenced.
S12ZVML 3-phase BLDC/PMSM Evaluation Kit | NXP Semiconductors
I checked that the motor on the ev board is running, but it's not working on the target motor.
It flinches slightly with a whine, then stops when one of the 'Idcb HI', 'GDU', and 'Stall' errors occurs.
I suspect that it is because the parameter value in the sample code is different.
The target motor has 14 poles. And it is being developed at 500-25000 rpm.
So I'm going to test it while modifying the value, but I don't know how to calculate it. I'm asking if there's a calculation formula.
Below is the parameter in the sample code.
/***** High speed scaling *********************
* For 4 pole-pairs motors
* Boundary values for 1.28 us timer period:
* - Minimal speed: 60 rpm
* - Minimal speed scaled: 86
* - Maximal speed: 22887 rpm
* - Maximal speed scaled: 32767
*********************************************/
#define SPEED_CALC_NUMERATOR 16777216
#define STALLCHECK_MIN_CMT_PERIOD 97 // 97 = 125 us (20 krpm on 4 pole-pairs motor), min value = 85 (22.89 krpm)
#define REQUIRED_RUN_SPEED (1432*2) // 2000 rpm
// 1431.655765 = 1000 rpm
#define MIN_SPEED (1432/2) // 500 rpm minimal speed for Down button control (should be min 10% of nominal motor speed)
#define MAX_SPEED (1432*5) // 5 krpm maximum speed for Up button control
#define SPEED_STEP FRAC16(100.0/22887.0) // 100 rpm, Up/Down step for button controls
#define BTN_PERIOD_DIVIDER 100 // scan buttons every 0.1 s only
//*****
