LAUNCHXL-F28027F: Question about the InstaSPIN - FOC can not reach the Max Speed

hello,everyone.

I use the Launchpad - 28027F and BoostXL - DRV8305EVM to drive my BLDC/PMSM motor.

and I set the #define USER_MAX_VS_MAG_PU        (0.5) .

but when I use the InstaSPIN - FOC to drive my motor,but it can not reach the max speed .

I use my six step dirve my motor ,the max speed is higher than  InstaSPIN - FOC .

and I test the terminal voltage scope.

I calculate the line peak voltage.

the line peak voltage is 20.137V.the dc bus voltage is 24V .

the using percent of voltage  = 20.137V./24V = 84%.

but I calculate the SVPWM using percent with USER_MAX_VS_MAG_PU is equal to 0.5.

the SVPWM  using percent of voltage = (2/3)*Udc*sqrt(3)/2*sqrt(3)/Udc = 100%.

but now the instaSPIN :  84%.< 100%.

and I have anather question about improving the motor max speed.

Increase the USER_MAX_VS_MAG_PU value and Field weaking  all can improve the motor max speed.

I don’t know which method should I choose first .

which one is the best method to improve the motor max speed .

Thanks.