RM48L952: Problem in driving three phase motor

Jimmy Jones

Part Number: RM48L952
Other Parts Discussed in Thread: DRV8301, HALCOGEN

Hey there,

I am using DRV8301 to drive three phase BLDC motor with the help of the control card TMDXRM48

I have just initialized the GIO and HET driver with the help of HALCogen and overall coding of starting PWM (through pwmStart) and setting the direction of HET pins with the help of[(gioSetDirection(hetPORTA,0xFFFFFFFF)] and by setting the HET pins by using gioSetBit() and by giving delays between the pins AH,BH,CH,AL,BL,CL in a specific sequence,PWM is being appeared on the output of Motor Phase A,B and C . The problem is that when I am connecting the motor the previously generated wave is not being appeared plus RED led which is the FAULT LED is being toggling.

Note: In DRV8301 I have enabled EN_GATE, and providing pwms on PWM_AH,PWM_BH,PWM_CH,PWM_AL,PWM_BL,

PWM_CL and the output is being appeared on GH_A,GH_B,GH_C,GL_A,GL_B,GL_C respectively

after connecting the motor and J4 connector of motor to J4 on DRV8301.

I have not touched any ports other than PWM and EN_GATE,will this be fine?

Do I have to do some more configurations, If yes then please guide which of them?

over 8 years ago

0 Bob Crosby over 8 years ago

TI__Guru 72500 points

Is this the kit you have: store.ti.com/DRV8301-LS31-KIT-TMS570LS31-Hercules-Safety-MCU-Motor-Control-Kit-P3116.aspx Have you been able to run the "Out of box" demo software? Here is a video link to help you get started: www.youtube.com/watch

0 Jimmy Jones over 8 years ago in reply to Bob Crosby

Prodigy 210 points

Hey Bob,

Before connecting the motors when I look at the phase output at A,B and C it seems like first is of phase A w.r.t. ground

second is of phase B w.r.t. ground

third is of phase C w.r.t. ground

But when I connect the three phase motor the output of each phase w.r.t. ground appears like this

Can you tell me why I am not getting the proper waveform when I am connecting the motor?

0 Jimmy Jones over 8 years ago in reply to Jimmy Jones

Prodigy 210 points

Hey Bob,

pwmSetSignal(hetRAM1, pwm1, Set_Duty_Period2);
pwmStart(hetRAM1, pwm1); // pwm 1 is set for PWM_AL

i=0;
while(i<4000)
{
i++;
}

pwmSetSignal(hetRAM1, pwm4, Set_Duty_Period2);
pwmStart(hetRAM1, pwm4); // pwm 4 is set for PWM_CH

when I use this type of delay sequence then sometimes it appears a delay of 560usec and sometimes overlap occurs between waves,please tell me how to give proper delay between two PWMs?

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RM48L952: Problem in driving three phase motor