Advantages of 3 Phase Step motors

[bunalmis]

What are the advantages of 3 phase step motors?

Can you compare with 2 phase stepper motors?
(Price, torque, speed, driver and other)

[AbSat]

What are the advantages of 3 phase step motors?

Can you compare with 2 phase stepper motors?
(Price, torque, speed, driver and other)

I think the main advantage is that there are only three halfbridge stages needed to drive this motors.
I have a router running with three KT60KM06 Trysin motors salvaged from
photocopiers. The step angle is 0.6degr. so running in halfstep mode 0.3degr.
I use the HA13532 controller and the SLA7023 driver, from the original controller, to make them working and they doing verry well. Reasonable speed and no problem with resonance till now. The router works 8" by 11" and is mostly used for milling PCB's.
Last week I ran into a other 3Phase driver board from a copier with a STK673-010 driver. One complete driver block with microstepping possibilities. I did not test is yet but I will in the comming weeks.
I do not have experiance yet with 2phase motors on a machine so I cannot compare them with the 3phase motors but they are running verry smooth with me.
Pictures of the router and the home build drivers on www.aanrip.nl

AbSat.

[mcpltd]

I think the main advantage is speed, if you look at the torque curves the torque does not drop off like a 2 phase motor does.
Also the resolution is better than a 2 phase.
They are slightly more expensive though but only slightly.

this is a torque curve from one of our motors:
http://www.motioncontrolproducts.co....ves/FL573P.gif

[Jason Ross]

3 phase has much better resonance response, better torque when microstepping and better high speed torque. 3- phase is more expensive and has more expensive electronics to drive them. 2 phase has better full step torque (marginally). 3 phase cabling is less expensive. It is easier to do accurate velocity control with a 3 phase due to the low detent torque. Power output in the 600-1000 rpm range will be about 30-40% greater than with a 2 phase stepper and 3 phase runs quieter at higher speeds.

[Newbie2CNC]

Does anyone have a driver schematic for a 3-phase KT60LM06 stepper motors?

Thanks!

[AbSat]

Does anyone have a driver schematic for a 3-phase KT60LM06 stepper motors?

Thanks!

As I stated before, I use drivers build arround the HA13532 controller from Hitachi and the SLA7023 driver salvaged from Photocopiers. I build the apllication from the datasheet and that works verry good. But the problem will be to get these chips I think. The same with the STK673-010, an even more simple building block but just as hard to get in the "wild" I presume. When anyone knows a supplier for that block please let me know. I have a uP job in mind to replace the HA13532 but when ? who knows.
When you need schematics of what I am using now let me know. From the SLK673 I have a circuit drawn in Eagle, for the HA13532 I have to make en decent one.

AbSat.

[stevenmotor]

There have good and inexpensive steppers.

mct.motor@msa.hinet.net

[jeffryhao]

I could get used HA13532, but I can not find the datasheet, could you please send the schematics of what you using now to me? Thanks a lot. jeffryhao@163.net.

As I stated before, I use drivers build arround the HA13532 controller from Hitachi and the SLA7023 driver salvaged from Photocopiers. I build the apllication from the datasheet and that works verry good. But the problem will be to get these chips I think. The same with the STK673-010, an even more simple building block but just as hard to get in the "wild" I presume. When anyone knows a supplier for that block please let me know. I have a uP job in mind to replace the HA13532 but when ? who knows.
When you need schematics of what I am using now let me know. From the SLK673 I have a circuit drawn in Eagle, for the HA13532 I have to make en decent one.

AbSat.

[2muchstuff]

AbSat,

Nice little site you have there, I like the anti backlash nuts with the o-rings,yabs. I've done a fair amount of scrounging of copy machines and have yet to come across any 3-phase steppers, all I've ever seen have been 2-phase. I'm going to have to keep my eyes open for some. Always looking for something different/better.

[AbSat]

AbSat,

Nice little site you have there, I like the anti backlash nuts with the o-rings,yabs.

Thanks 2muchstuff, I will pass your words to the owner of the site. Leor. I join the group to give some electronic support. We came across the 3 phase motors and now I found some 5 phase motors. I even found a PCB with EIC driver chips and SLA5011 and 5012 drivers for these motors. I got it working even without any documentation. The motors are running very smoothly, athou I think 125.000 steps per revolution is a little overdone. I got 480 rev/min with a 1 MHz step puls rate. But with 2000 steps/rev. they run fine. When you find STK673-010 driver hybrids please save them for me
That are complete 3 phase driver controllers, only one chip and a few resistors and capacitors added and you have a complete microstepping driver.

@ jeffryhao. I will mail you the schematics and the datasheet of the HA13532.

AbSat.

[2muchstuff]

A couple of years ago I scrounged up a 5-phase stepper the size of a football. I traded it away for something else because at the time there were no diy/hobby 5-phase controllers out there. Now I'm starting to wonder if I should have kept it. Now that I know what to look for, thanks to your picture, I'm going to keep an eye out for 3-phase steppers. What brand of copiers have you been finding them in. There are several places that throw them away wholesale style that I frequent.

[AbSat]

I think it are Konica copiers.
I go there tomorro and will take a good look.

AbSat.