5 Phase steppers, low inductance

[ipxpop]

I have a pair of large 5 phase steppers:

Berger Lahr RDM 51117/50

These have a DC resistance of 0.3 Ohm, and need 5 A per phase. I'm thinking of driving them with 4 phases on, and one off.

I'm looking for info about how to make a controller for these. Is there a PWM device that can deliver this current, either half bridge or full bridge? (My motors have 10 leads, so I have flexibility in the wiring).

My thought was to wire the motor as a star, and build 5 half bridge drivers. Then I could either drive the phases continuously, or PWM them for increased resolution. I'm thinking half bridge, because with full bridge I'll need 20 MOSFETs per motor, vs 10 per motor with half bridge.

If I do PWM, do I need to synchronise all the drivers so they all switch on at the same time?


Thanks for any info,

Neil Baylis

[Jason Marsha]

There was a user that built one for the 10 lead motors when I find the info I will post it for you.
I took some 5 lead 5 phase 2.6 A per phase vexta motors from a copier and they have been paperweights since then.


Jason

[Jason Marsha]

Here is the link to the users gallery.
http://www.cnczone.com/gallery/showg...00&ppuser=8575

Jason

[ipxpop]

Thanks, Jason. I'm checkin' it out.

[Jason Ross]

Hi, I work for Berger Lahr in the states. We still make drives for those motors, but they are expensive (but good ) You need to specify more of the part number. Berger Lahr has 5 phase motors have a very "European feel" our drives are wired in a pentagram arrangement and they can have a much higher bus voltage than other manufacturers for better power density. If you want to see our literature on our 5 phase drives try http://www.bergerlahr.com/upload/Dok...2_WS5-5-gb.pdf. We have evolved our motors to 3 phase for a whole host of performance gains that are more competitively priced.

[ipxpop]

Thanks, Jason.

The doc you referenced has a good diagram of the phase wiring of the motors, which will make it easy for me to get the phases wired correctly. It looks like they use half bridges, rather than full bridges, which of course makes things simpler.

I can't afford to buy a driver, so I'll have to make one. I think I have the components I need. Just need to do some experiments using a PIC to generate the PWM signals.

[jeaves]

Hi. Did you ever make the driver for your Berger Lahr 5-phase steppers? How did it go? I have a couple I'm trying to run, and the vexta driver isn't cutting it. Any suggestions? Thanks. Jon

[AbSat]

I have some 5 phase steppers too and I was able to save the drivers also, but they are build with EICO VEXTA chips, the EICO231 and EICO241 as controller and the SLA5011 SLA5011 pair as drivers. I can use the driver PCB boards after I found out the connections for the dir step enable and microstep selection signals.
Looking for other solutions on the net I found this site http://www.geocities.com/dsaproject/.../cnc_ctrl.html with a description and diagram.
With the data form this site and what is available from Berger Lahr itself I planed too try to program a uP as a controller for 3 and 5 phase motors but I did not come to it yet. The last year CNC did not have the priority in my doings. I something happens I will let you know here.

AbSat.

[Khalid]

I have VEXTA stepping motor MODEL PK566-NAC , 5 PHASE and having 5-WIRES. DC 1.4Amp and 1.! Ohm resistance. Please tell me where i get driver to run this motor.

[jbassler]

Jason,

I could use those paperweights. let me knwo if you still have them?

thanks a ton

-JDB

[awie_jkt]

Hi everybody,

[fransisi]

Originally Posted by awie_jkt Hi everybody,

I am looking for motor rdm 51117/50 Berger Lahr