Linistepper Smooth Driver for Small Unipolar Motors - CNCzone.com-Classifieds Buy and Selling

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Seller Details
James Newton Posts: 690 Registered: May 2005 Location: USA	Feedback: None See Detailed Feedback Contact Seller View seller's other items

Linistepper Smooth Driver for Small Unipolar Motors

Quantity	Views	Date Posted
1	6675	Mon January 14, 2008

Asking Price	Shipping Amount	Condition
$35.00	None	Excellent

Description:

Open Source! Circuit Diagram, PCB (Board) Layout, and PIC Software all available online. (Kit/PCB sales support PICList.com)

Standard step direction inputs easy connection to a parallel port for up to 7 units.

Use with standard CNC programs like TurboCNC or Mach 3

Uses standard Unipolar (5 to 8 wire) stepper motors. Not for Bipolar motors.

Linear drive moves the heat from the motor to the driver where it is easy to dissipate. The Linistepper requires a LARGE heat sink (not steel, but al/alloy with fins and perhaps even a small fan), but in return it reduces eddy current losses and heating in the motor typical of chopper type drivers.

Complete tutorial and FAQ explains How the board works, how to assemble the kit and how to power it up! Runs from your regulated 5v supply and controls motor supply which should be 2 to 3 times the rated motor voltage and 3 to 4 times the current of all motors.

Using the best components:
- Rugged: 5A 100v drivers to drive 1.5A/phase or more at 4v to 35v
- Smart: on-board PIC microcontroller. Comes pre-programmed. Active user groups and tons of code available.
- Solid: PCB with silkscreen and solder mask. Hard to damage and easy to repair

Supports the standard modes:
- 200 step - full step
- 400 step - half step (with Full Torque)
- 1200 step - microstep 6th!
- 3600 step - microstep 18th!

And some hard to find "magic" modes:
- NO STEP - stepless operation via constant current linear smoothing
- High-Torque half stepping
- Low power "hold" mode

See:
http://www.piclist.com/techref/io/st...step/index.htm for more information.

Comments:

posix says: [ed: Please read these comments to the end as posix learns how to correctly use the Linistepper]
"BTW to all those newbies out there Linisteppers impressed me as a newbie but then they were starting to show their weakness - they were sloooow. At least I thought it's due to linisteppers. Well, I can report that with 24v and laserjet steppers these things are SCREAMING!!! I'm running them nicely at 20revs/sec (albeit 1 minute at a time, untill I've sorted out my cooling problems) with my very rough machine that hasn't been executed too precisely or adjusted properly. Before at 12v the motors would stall at the slightest misalignment and 6revs/sec was all I could get out of them reliably. Once all that is ironed-out I'm thinking 30revs/sec (1.75mm lead) would be attainable. "
...

"[The Linisteppers] only deficiency, it seems, is the transistor heat. I have a chopper here and a linistepper and they both run at 24v. Linistepper "sounds" sweeter and it seems it runs faster as well before stalling. This is strange as I always thought a chopper would go faster and stall higher up in the rev range. "

...

"I don't know what I like better, burning my finger on the driver board or burning my finger on the motor. Which do you prefer? P.S. it seems that once I switched to a chopper driver all that heat that used to be on linisteppers just transferred to motors themselves! "

...

[ed, at this point, we find out that there was NO heatsink on the linisteppers power transisters]
"Since I burned my fingers on a motor that was driven by a chopper (and that motor was actually HOTTER than linisteppers driving other motors) I have decided to stick to linisteppers. It's easier to worry about heat in one place than 3 separate locations. Went down to my local PC shop and they'll have some 2nd hand pentium II coolers with fan in by monday. "

...

"Ok, I have re-assembled one of my linis, applied thermal paste, applied isolators to each, mounted the brackets and laid a 12v computer fan on the brackets blowing DOWN through the brackets and onto the lini. The lini transistors are now as cool as ice. "

Brian Gerber says: "with 118 oz inch motors and 1/4-28 threaded rod at 5 ipm I'm getting 50 pounds of force on the axis!"

Russell (epineh) says: "Fired up one of the boards today... that is one sweet driver on full microstepping! ... If I tried these drivers first I wouldn't have chosen to upgrade to servo's on my router... P.S. Did I mention that the motion was smooooth ?"

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Linistepper Smooth Driver for Small Unipolar Motors

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