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CCS/DRV8301: Question about maximum motor speed with using InstaSpin

Hiroyasu Matsubara
Expert 1405 points

Part Number: DRV8301
Other Parts Discussed in Thread: TMS320F28069M

Tool/software: Code Composer Studio

Hello,
I would like to ask about maximum motor speed when using InstaSpin.
Now I'm trying to drive a brushelss motor ,using InstaSpin Lab 5b(speed control).
And could drive the motor at speed 8300Rpm.
The motor spec etc. is:
Kv value = 610 (Rpm per volt)
Pole : 7 pole pairs
Voltage source = 18V
Board :
Three Phase BLDC & PMSM Motor Kit with DRV8301 and InstaSPIN-enabled Piccolo TMS320F28069M MCU
I identified the motor parameters(Rs,Ls etc.) by using Lab 2a.
I would like to know the reason why the maximum motor speed is about 8300Rpm.
The "theoretical" maximum motor speed is 10800 Rpm. ( 610Kv,18V)
The PWM frequency is 30KHz,and USER_NUM_PWM_TICKS_PER_ISR_TICK = 1,
USER_NUM_ISR_TICKS_PER_CTRL_TICK = 1.
USER_IQ_FULL_SCALE_FREQ_Hz = 1300.
The gMotorVars.Vs is 0.5 at 8300Rpm.
I would appriciate if anyone could reply to my question.
Hiroyasu