cancel
Showing results for 
Search instead for 
Did you mean: 

STEVAL SPIN3201 Hall Effect RPM Stability 3000RPM +/- 1.5RPM

MKing.2364
Associate III

Dear Community

I have developed a BLDC motor drive with a senorles BACKEMF control using a DRV10983 IC.

It uses sensor less control no halls used. If I look at the motors hall effects that are not used on the DRV10983 Chip My issue is that the speed is drifting hunting from 199.9Hz 200Hz 200.1Hz .

There are is 4 hall pulses per revolution so RPM = 200 x60 /4 = 3000 RPM

ON a blown up zoomed in graph with low pass filters the speed is gradually hunting between 2998.5RPM and 3000RPM and 3001.5RPM as speed drift.

I know this is a tiny tiny speed variance of only +/-0.05% of target speed of 3000 rpm but

The instrument the motor turns has an optical measurement system and the rpm drift is hunting the readings slightly

To see what I mean please click this link its a post I made on the DRV10983 Forum

http://e2e.ti.com/support/motor-drivers/f/38/t/860404

my question to BLDC experts / Users Can a sensored Hall effect with STEVAL SPIN3201 Kit improve the speed stability to say +/- 0.25 RPM or better.

Can a good PI Speed control with hall effects decrease the RPM drift to a smaller amount.

Or is +/- 1.5RPM in 3000 RPM the best speed stability achievable in sensored or sensorless

control.

Sorry this post was previously posed in the wrong section its more viable in this Motor Driver ICS and boards section.

Thanks for reading any advice would br really appriciated.

1 REPLY 1
MKing.2364
Associate III

Summary to the point can +\- 1.5rpm in 3000rpm be improved from senorless bemf drv10983 Texas.Instrumentsby a sensored stm32foxx part using hall effects.with tuned p.i speed.control loop any advive would be very much appriciated