2 Phase Servo Control
2 Phase Servo Control
(OP)
Does anyone know a good source of info on 2-phase 6 pole perm magnet servo control? I'm using resolver feedback.
All web and book info I can find is 3 phase, which I can't use in my application.
All web and book info I can find is 3 phase, which I can't use in my application.





RE: 2 Phase Servo Control
RE: 2 Phase Servo Control
Why is your app 2 ph. critical?
Thanks,
Scott
In a hundred years, it isn't going to matter anyway.
RE: 2 Phase Servo Control
Trouble is, I don't have much DC motor experience, and I'm having trouble just getting started.
Any ideas?
RE: 2 Phase Servo Control
RE: 2 Phase Servo Control
Do you need position or only speed control? accuracy?
Plesae read FAQ240-1032
My WEB: <http://geocities.com/nbucska/>
RE: 2 Phase Servo Control
RE: 2 Phase Servo Control
Stepper motors have hundreds of poles not 6.
Plesae read FAQ240-1032
My WEB: <http://geocities.com/nbucska/>
RE: 2 Phase Servo Control
The current is about 2 amps, 28 VDC. The motor will be operating at about 10,000 rpm
I am more concerned about position control. I am slightly concerned about rotor inertia and backlash, but I don't anticipate a problem :)
I'm told 2-phase is 5-10% more efficient.
RE: 2 Phase Servo Control
brushed dc motor (I've been wrong). If you have 3 or 4 then it is likely a 2 phase motor.
The resolver is just a feedback device (gives sinusoidal analog signals) and you'd need a resolver converter IC which will give you signals that you can process digitally. Do a resolver converter in Google and you'd come across the IC and app notes. The number of poles gives the motor more torque. Basically, it is just more coils in series but maybe interwoven with the other phase. Poles are paired to give it N and S magnetic polarity.
You'd need to come up with an algorithm to commutate every 0 to 180 degrees electrical. You'd need to align the resolver with the 0 position of the rotor if it has not been done or you can offset in firmware. Good luck.
CA
RE: 2 Phase Servo Control
Thanks for the feedback. How about the power requirements? Is there an easy (cheap) way to generate the sinusoidal excitation?
RE: 2 Phase Servo Control
I doubt that you are going to find an integrated solution. Systems with resolver feedback are usually for 3-phase motors so the power-stage topology is different, and the algorithm may not be flexible enough to support phases with 90-degree instead of 120-degree spacing.
It looks like we could provide you with all the pieces you need to do this, but it would be an expensive solution and probably overkill for what you need. You can contact me offline if interested.
Curt Wilson
Delta Tau Data Systems
RE: 2 Phase Servo Control
If you just need to make one work... Go for Curt's suggestion.
http://ww
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: 2 Phase Servo Control
RE: 2 Phase Servo Control
respectfully