[Arquibaldo]

Dear CNCer's:

Yesterday a found an apparent jewell at the junkyard:
a 0.72 degree/step motor (that is 500 steps/revolution!).

The data are:

Oriental Motor model PH596H-B NEMA34
Iw=2.7A Rw=0.43ohm Vw=1.16V
max static torque: 1.22Mm

The problem started when I counted the wires: There are 10 wires!
measurements seem to show that there are 5 identical coils:

white-yellow red-blue green-orange black-blue violet-brown

Having never heard of a 5-coil stepper, I search these forums &,
sure enough, found that I was stuck with a 5-phase stepper made
by Oriental but under licence from Berger Lahr.

Now, I really want 500 steps/revolution, and am willing to try
building a driver for this beast, if someone can help me find
the specs for driving this motor (I can program a microcontroller
and wire a MOSFET driver - it might even be easier than a bipolar
driver, if the sense of the current on the coils does not have
to be reversed...)

If I can get this thing to work, I promise to share my results
with this community...

Arquibaldo

[Arquibaldo]

OK, I found in "Jones on steppers" (http://www.cs.uiowa.edu/~jones/step/)
the basic info on the sequence of phase activation for
multi-phase motors...

This is a start, but any further info is most welcome

Arquibaldo

[Arquibaldo]

OK, guys - sorry to bother you - I should have searched more before posting...

I found that this guy:

http://www.geocities.com/dsaproject/.../cnc_ctrl.html

has already built an experimental 5-phase drive.
I think I'll start with this design & see what I achieve.

Will keep you posted - This seema to be a promising approach:

5-phase steppers are powerfull, smoother and have
high resolution. Besides, if you can find them, they are
inexpensive because most people don't know how to
drive them...

Arquibaldo

[AbSat]

@ Arquibaldo.

I am using 3 fase steppers form the KT60 series from TRISYN.
I was lucky that I could take some controller and driver ic's from the original controller board so I was able to rebuild the controller. Maybe the datasheet and apllications of the HA13532 maybe of help by developping a 5 fase controller.
I have a 5 fase motor also and more 3 fase motors then controller ic's for it so I have to replace them with micro controllers and program them myself. So therfore thanks for the link above to the 5 fase project.
Succes, and keep us posted about the results as I will too.

AbSat.

[paul2112]

Arquibaldo, did you manage to build a drive for the 5 phase motor?

I have an Emco mill that needs a retro fit, this is fitted with 5 phase, 0.47ohm, 2.8A per phase steppers so sound much the same as you have. The original drives are completely shot and after several time consuming and expensive rebuilds I've had enough and decided to refit. First I thought I would replace the steppers and dirves but after reading a bit about 5 phase motors it would seem a better solution to hang on to them if possible. There are a couple of companies making suitable drives but they are expensive to say the least so building the drives is really the only option to keep the 5 phase motors.

How did you get on?

Paul

[AbSat]

I just came across this site http://www.deutsche-werke.de/odin3d.htm with some ideas about a 5fase driver. Partly in German but it maybe of some help.

AbSat.

[paul2112]

Thanks Absat, good find. I have mailed the company to find out what parts they can supply.
They hold the key to this with the programming of the GALs and AVR.
Could work out to be a good solution.

Paul2112

[wisp]

I have some Vexta PK569 5-phase motors & Vexta drives. Let me tell you, the difference between a 5-phase and a 2-phase motor is amazing. The 5ph motors are absolutly smooth as silk, there is none of the resonance/buzzing that you get with a 2ph stepper. They are also nearly silent until you get up to about 600+ RPM, and then they make a high pitch zhhhhiiiiiiiinnngggg. My Vexta documentation also says 5ph steppers have more torque when you 1/2 step them vrs full step.

I will try to make a short video of a 2ph stepper motor winding up, and a 5-phase so you can see & hear the difference.

[huongthanh]

Hi everybody,
I have a 5phases stepper motor (5 wires) with spec. 2.8A/Phase; 2.42V/Phase and 0.72o/Step. It is pentagon connection. I tried to build a driver use 89S52 as logic microcontroller and MOSFET as 5 half H-bridge (pls refer the attachment file). As above mention spec. of the motor then it will be turn one revolution with 500 step pulses (full step). But, actually it turns three revolutions with 500 step pulses from my driver.
Step sequence as below:
Terminal 1 +++-----+++++-----++
Terminal 2 --+++++-----+++++---
Terminal 3 +-----+++++-----++++
Terminal 4 +++++-----+++++-----
Terminal 5 ----+++++-----+++++-
Where is mistaken? Thanks

[harty]

Hi huongthanh
i think the phase should shift like this

terminal1++++-++++-
terminal2+++-++++-+
terminal3++-++++-++
terminal4+-++++-+++
terminal5-++++-++++

so only one coil powers down at any one time and the coil that powers down is the direction the motor steps

could be wrong though

cheers
harty

[vger]

how about this one http://www.alltronics.com/cgi-bin/it...-Phase--Driver
I have a pair that are a slightly different model (older model from same manufacturer) that I plan on using for the A and B axis of a 6 axis machine.

Steve

[huongthanh]

Hi huongthanh
i think the phase should shift like this

terminal1++++-++++-
terminal2+++-++++-+
terminal3++-++++-++
terminal4+-++++-+++
terminal5-++++-++++

so only one coil powers down at any one time and the coil that powers down is the direction the motor steps

could be wrong though

cheers
harty

Thanks for your reply,
As your suggestion, I think at any time there are three coils of the motor disable, so may be it will be reduce torque...I will try and see how the result. Thanks.

[gastondamian]

Did you found how to build a driver for a 5phase stepper motor?

I bought 3 Vexta 5 phase motor and a I dont find any circuit to build a driver

Regasdrs,
Gaston