Gecko recommendations and wiring for my motors

[jemmyell]

Hi all,

I have several small routers that use a proprietary half-step controller that performs very poorly at low speeds. The motors used in the routers are:

Vexta PK268-01A
Shinano-Kenshi SST58D510

I want to switch to all Gecko ultimately. I currently have three G201 drives that I was going to use with a large 48V power supply, but it seems the power supply would be a better match for the G250 / G540 products.

Can I get some comments and recommendations vis-a-vis these motors and Gecko drives?

-James Leonard

[CoAMarcus]

James,

Do you have the data sheet for these motors? Specifically the voltage, current, and inductance would be the most useful. What is the frame size of your motors?

Marcus

[jemmyell]

Hi Marcus,

Thanks for your time as always!

They are both NEMA23 motors

The Vexta PK268-01A - 6 wire

12V - 0.71A / phase - 2 phase - 5.6 mh inductance

The Shinano-Kenshi SST58D510 - 8 wire

24V - 1.4A / phase - 2 phase - 4mh inductance

The Vexta is the older motor. They were both supplied for use apparently with the same controller / power supply, but now I mus check that. There is nothing about this in the model specs I received.

The motors 'growl' at very low speeds. For my application I don't really care about anything over 15 IPM (on these tables) and I need the best, smoothest performance at 2 IPM to 6 IPM.

-James

[jemmyell]

I wanted to use the Shinano-Kenshi with my 201's and then get G540's once the next revision with the charge pump (I am a Mach3 user) is available. Is this a bad plan?? The G540's would be for the smaller motors.

-James

[jemmyell]

Hi,

Will either of these motors work with G201 I currently have or with the G540?

Anybody?

-James

[Crevice Reamer]

Originally Posted by jemmyell Hi all, I have several small routers that use a proprietary half-step controller that performs very poorly at low speeds. The motors used in the routers are: Vexta PK268-01A Shinano-Kenshi SST58D510 I want to switch to all Gecko ultimately. I currently have three G201 drives that I was going to use with a large 48V power supply, but it seems the power supply would be a better match for the G250 / G540 products. Can I get some comments and recommendations vis-a-vis these motors and Gecko drives? -James Leonard

Neither of these motors are good G540 candidates, although the Shinanos might squeak by.

The Vexta motors (according to your specs--Mine indicate much higher) have a best voltage of 75V. The Shinano Max at 64V, probably when wired BPP. How are you wiring the Shinanos?

Both are well within the range of the 201s and the 48V PSU. IMO the Vextas look to be very inefficient.

However, the Gecko drive is so much more powerful that it may well solve your problems. You have nothing to lose by trying the already in-hand G201s. They should make a considerable difference.

CR.

[jemmyell]

Originally Posted by Crevice Reamer Neither of these motors are good G540 candidates, although the Shinanos might squeak by. The Vexta motors (according to your specs--Mine indicate much higher) have a best voltage of 75V. The Shinano Max at 64V, probably when wired BPP. How are you wiring the Shinanos? Both are well within the range of the 201s and the 48V PSU. IMO the Vextas look to be very inefficient. However, the Gecko drive is so much more powerful that it may well solve your problems. You have nothing to lose by trying the already in-hand G201s. They should make a considerable difference. CR.

Thank you VERY much!

I don't know how to wire the motors. It is unfortunate the G540 won't be good since that is the best integrated solution I have seen to date.

Recommendations on wiring?

My router tables have ball screws that have had the ends lathe turned to accept a coupler and the motors have a flat machined on them so this coupler won't slip. So, I was really hoping to not disturb the motors. But the combo of the half-step controllers and these motors REALLY doesn't work well at very low speeds which is where most of my cutting has been done so far.

The Shinanos are on the largest table. I will try the 201s on that. Once I have two tables working again I will risk swapping out the motors on the other small table.

Thanks again.

-James

[Crevice Reamer]

The 8 wire motors should be wired bipolar parallel.

Motors of the small Vextra size that WILL work well with the G540 and 48V are available from keling for $33 each.

http://kelinginc.net/

On this specs page is an example of Bipolar parallel wiring.

http://kelinginc.net/KL23H256-21-8B.pdf

Since you want such low speeds, you could also use a 382 or even 425 oz Keling motor.

CR.