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BOOSTXL-DRV8305EVM: Speed limit problem with DRV8305 + F28069m

Part Number: BOOSTXL-DRV8305EVM
Other Parts Discussed in Thread: DRV8305, MOTORWARE, TIDA-00916, TMS320F28027F, DRV8301


Hello

I'm wainting some help  

Since a couple of weeks, I have tried to run a 6 pole pair motor (BLDC) up to 10 000 using the DRV8305 + F28069 boards with the Motorware InstaSPIN (projet 10a)

No mather the PWM and control frequency used (from 45 Khz to 80 Khz), the system stop to drive the motor when the speed is about 9080 rpm.

I have also tried to change some parametes but nothing changed even if I'm folling the TI design (TIDA-00916) where the speed motor up to 12 000 rpm with the same hardare and a equivalent motor(6 pole pair motor).

custom parameters :

#define USER_PWM_FREQ_kHz (55.0)
#define USER_NUM_PWM_TICKS_PER_ISR_TICK        (2)
#define USER_NUM_ISR_TICKS_PER_CTRL_TICK       (2)
#define USER_NUM_CTRL_TICKS_PER_CURRENT_TICK   (1)
#define USER_NUM_CTRL_TICKS_PER_EST_TICK       (1)
#define USER_NUM_CTRL_TICKS_PER_SPEED_TICK  (8)
#define USER_NUM_CTRL_TICKS_PER_TRAJ_TICK   (15)

#define USER_FLUX_POLE_rps             (100.0)
#define USER_SPEED_POLE_rps           (100.0)
#define USER_VOLTAGE_FILTER_POLE_Hz   (1600.0)
#define USER_MAX_VS_MAG_PU        (0.66)

My Model motor  
#define USER_MOTOR_TYPE MOTOR_Type_Pm
#define USER_MOTOR_NUM_POLE_PAIRS (6)
#define USER_MOTOR_Rr (NULL)
#define USER_MOTOR_Rs (0.070456259)
#define USER_MOTOR_Ls_d (3.05105423e-05)
#define USER_MOTOR_Ls_q (3.05105423e-05)
#define USER_MOTOR_RATED_FLUX (0.00672880746)
#define USER_MOTOR_MAGNETIZING_CURRENT (NULL)
#define USER_MOTOR_RES_EST_CURRENT (2.2)
#define USER_MOTOR_IND_EST_CURRENT (-2.2)
#define USER_MOTOR_MAX_CURRENT (15.0)
#define USER_MOTOR_FLUX_EST_FREQ_Hz (200.0)


What are the elements that can block this desired speed ? hardware ? software ? parameters ?  

Thanks