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CCS/TMS320F28026F: Problem at high Speed / High Current using FOC proj_lab05a.c

Part Number: TMS320F28026F
Other Parts Discussed in Thread: DRV8301-69M-KIT

Tool/software: Code Composer Studio

Hello,

I use the FOC Motorcontroller for a 48V 150A Motorcontroller vor Battery Applications.

A lot of Hardware will be damaged by Overvoltage after the calculation of FOC is going out of control. Now I have a powersupply in combination to a electronic load to avoid overvoltage.

The motor is a PM-Motor with a Setup in user.h

#define USER_MOTOR_TYPE                 MOTOR_Type_Pm
#define USER_MOTOR_NUM_POLE_PAIRS       (4)
#define USER_MOTOR_Rr                   (NULL)
#define USER_MOTOR_Rs                   (0.07727911323308945)
#define USER_MOTOR_Ls_d                 (0.0005313076544553041)
#define USER_MOTOR_Ls_q                 (0.0005313076544553041)
#define USER_MOTOR_RATED_FLUX           (0.05179470404982567)
#define USER_MOTOR_MAGNETIZING_CURRENT  (NULL)
#define USER_MOTOR_RES_EST_CURRENT      (8.0)	//
#define USER_MOTOR_IND_EST_CURRENT      (-5.0)	//
#define USER_MOTOR_FLUX_EST_FREQ_Hz     (30.0)

#define IPD_HFI_EXC_FREQ_HZ             (750.0)       // excitation frequency, Hz	//750
#define IPD_HFI_LP_SPD_FILT_HZ          (10.0)        // lowpass filter cutoff frequency, Hz
#define IPD_HFI_HP_IQ_FILT_HZ           (20.0)        // highpass filter cutoff frequency, Hz
#define IPD_HFI_KSPD                    (15.7)        // the speed gain value	//31.4
#define IPD_HFI_EXC_MAG_COARSE_PU       (0.2)         // coarse IPD excitation magnitude, pu
#define IPD_HFI_EXC_MAG_FINE_PU         (0.1)         // fine IPD excitation magnitude, pu //0.2
#define IPD_HFI_EXC_TIME_COARSE_S       (0.5)         // coarse wait time, sec max 0.64	//0.2
#define IPD_HFI_EXC_TIME_FINE_S         (0.2)         // fine wait time, sec max 0.4	//0.1
#define AFSEL_FREQ_HIGH_PU              (_IQ(20.0 / USER_IQ_FULL_SCALE_FREQ_Hz))
#define AFSEL_FREQ_LOW_PU               (_IQ(10.0 / USER_IQ_FULL_SCALE_FREQ_Hz))
#define AFSEL_IQ_SLOPE_EST              (_IQ((float)(1.0/0.1/USER_ISR_FREQ_Hz)))
#define AFSEL_IQ_SLOPE_HFI              (_IQ((float)(1.0/1.0/USER_ISR_FREQ_Hz)))
#define AFSEL_IQ_SLOPE_THROTTLE_DWN     (_IQ((float)(1.0/0.05/USER_ISR_FREQ_Hz)))
#define AFSEL_MAX_IQ_REF_EST            (_IQ(1.0))	//0.4
#define AFSEL_MAX_IQ_REF_HFI            (_IQ(0.7))	//0.4

Today I work with only 20A maximum motor current.

The Problem is on all kind of Lab-Software (I testet lab05a lab05b lab11a) with my motor on the own Hardware and also on the DRV8301-69M-KIT Board

We want to use the motor dynamic with fast accelerations.

Depend on the setting of:

- Spd_Kp, Ki ( use only 10% of the automatic Settings)

- Idq_Kp, Ki (I use only 25% of the automatic Settings)

- PWM Frequency (13 kHz max)

- Setting of maximum motor Current (20 A max)

- Setting of maximum Speed (today only 3.000 rpm)

In the moment if I set one of this 5 values to a higher level the system will react on high speed and high current sometimes with wrong speed measurements, and also sometimes with high current measurement. Iq_A will be on peak values. As an result all PID stages make stupid things... If I reduce the speed the system will run stable.

For my feeling one Value of the FOC go over an Limit on high current and high speed...

So I use today the projlab05a.c Projekt with a lot of securety-Software around to avoid the Undervoltage, Overvoltage, Overcurrent, max Bus Current.... So my hardware is now in stable status without damaging on Software Problems.

What do I make wrong???

  • Do I understand you correctly that you experience the same issue on both the Texas Instruments EVM as well as on your own hardware? When you run the motor ID lab, do you receive the same values for Rs, Ls/Ld from both sets of hardware?

    Sean