Group: DynoMotion	Message: 11117	From: janbbeck	Date: 2/20/2015
Subject: Maximum Commutation Speed

What is the maximum commutation speed SnapAmp can output, please?

Group: DynoMotion	Message: 11118	From: TK	Date: 2/20/2015
Subject: Re: Maximum Commutation Speed

KFLOP computes commutation and outputs a new value to SnapAmp every 90us.

Regards
TK

On Feb 20, 2015, at 4:38 AM, homeloan@... [DynoMotion] <DynoMotion@yahoogroups.com> wrote:

What is the maximum commutation speed SnapAmp can output, please?

Group: DynoMotion	Message: 11120	From: janbbeck	Date: 2/21/2015
Subject: Re: Maximum Commutation Speed

Wow! This unit is far more capable than I realized when I bought it.

So in principle I can drive even a turbomolecular pump (up to 1500 hz rotational frequency) with my snapamp.

Lets say I just write a program that changes the commutation setting every 90 uS to where it is supposed to be at that time (ramping up slowly). That updates the angle at over 10 KHz update rate.

Is this correct (as long as the back EMF and current requirements are within the SnapAmp limits)?

Thanks!

Group: DynoMotion	Message: 11122	From: Tom Kerekes	Date: 2/21/2015
Subject: Re: Maximum Commutation Speed

I suppose that is possible as long as the inductance and back-emf is low enough. SnapAmp PWM's at 32.5KHz so there are about 3 PWM pulses to the coils for each 3 phase output value written to SnapAmp.

Regards