DRV8308: Motor doesn't run good.

Evgeny7

Part Number: DRV8308

I set the registrers

reg_val = 273; //0x0111 - bit11 - active high
DRV8308_WriteRegister(DRV8308_REG00, reg_val);
reg_val = 1279; //0x04FF
DRV8308_WriteRegister(DRV8308_REG02, reg_val);
reg_val = 26624; //0x6800
DRV8308_WriteRegister(DRV8308_REG03, reg_val);
reg_val = 16594; //0x40D2
DRV8308_WriteRegister(DRV8308_REG04, reg_val);
reg_val = 61440; //0xF000
DRV8308_WriteRegister(DRV8308_REG0A, reg_val);

Then I set ENABLE high and PWM - 50%. No movement.

Then I set PWM - 70% - motor spins in spurts. If I move the shuft by hand or after 10-20 'jumps' - it spins fast and smooth. If I lower PWM - motor immediately stops.

What parameters should I adjust?

over 7 years ago

0 Rick Duncan over 7 years ago

TI__Guru** 114905 points

Hi Evegeny,

I apologize for the late response.

I will have an answer no later than Monday.

0 Rick Duncan over 7 years ago in reply to Rick Duncan

TI__Guru** 114905 points

Hi Evgeny,

Are you using the motor with the EVM? Using the motor with the EVM, I found the motor would spin until HallPol was changed to 0.

Please ensure HallPol in register 0x06 is set to 1.
Also please remember registers 0x01, 0x05 through 0x09, and 0xB should be set similar to the EVM.

0 Evgeny7 over 7 years ago in reply to Rick Duncan

Prodigy 220 points

All these registers return 0 on startup on EVM board. I load some values . But I don't know if it's valid. But after reset all registers are zero.

Thank you. HallPol did the magic but the motor runs only at 70% duty cycle. If I lower the duty cycle just a little bit - it immediatly stops.

0 Rick Duncan over 7 years ago in reply to Evgeny7

TI__Guru** 114905 points

Hi Evgeny,

I haven’t heard back from you, I’m assuming you were able to resolve your issue. If not, just post a reply below (or create a new thread if the thread has locked due to time-out)

0 Evgeny7 over 7 years ago in reply to Rick Duncan

Prodigy 220 points

Sorry. No progress regarding the issue. Probably hardware problem. Still can't get it .

Motor drivers

Motor drivers forum

DRV8308: Motor doesn't run good.