l6235q motor speed

[ross_atkinson]

Hi

I have a motor contol design for a 4pole motor 4800 rpm but my control seem to be limiting the speed to 300-500rpm

I have followed the app note AN1625 and using a integrator circuit. I can adjust vspeed voltage via a pot. but this does not change the speed much.

I have set my Tpulse to 282us 

RCOFF parts are is 1nf and 33k.

my integrator is a 5v signal rail with the feedback of 1meg and a 220nf cap. A 5.6k / 1.8k resistor divider on the output. which feed Vref of the L6235.

what am i doing wrong. do i need to ajust my resistor network?

regards

Ross

 

 

 

 

[ross_atkinson]

hi

 update, hall effect filter causing the issue now running at 8500rpm with 25v or 6000 rpm at 20v. need to run 600rpm at 28v. do i need to increase my rcoff time?