I'm proud to present the results of the new servo drive development project from CNCzone forums! This project started in the forum over a year ago and the goal was no less than to develop a professional quality and performance servo drive with hobbyist level pricing.
In a nutshell, it is a single axis universal step/dir capable drive for DC/BLDC/AC servo motors with output capability of 12.5 Amps and input voltage range of 24-200 Vdc. For detailed specifications, please see the product page:
Fluxeon VSD-A specifications:
http://www.granitedevices.fi/index.php?id=8
See also a short video clip showing VSD-A running AC servo motor:
http://video.google.com/videoplay?do...92974890836012
What makes this drive performance so good?
Fluxeon implements fully tunable field oriented flux vector torque control that has become an industry standard in top class AC servo drives. Vector control has been typically available only in much more expensive drives.
Fluxeon has been built around a high performance 60 MHz digital signal controller with 12 bit AD converter for precise, quiet and maximum troughput control.
Fluxeon features also tunable acceleration and velocity feedforward paths for quicker response. Feedforward means direct path from commanded position input to motor torque output. In other words, feedforward eliminates the most position error before it even starts forming. A smaller residual position error is being corrected by a standard 32 bit PID feedback loop.
Why torque control is so important?
Torque control is an essential part of servo controls since motor position can be controlled ONLY by adjusting shaft torque. Most (if not all) low cost drives have no closed loop torque control. Instead these drives are based on voltage control which produces sluggish torque response mostly because of the effect of motor winding inductance.
In voltage control mode, the torque bandwidth is typically around 30-80 Hz (derived from motor inductance and resistance). In comparison, a closed loop torque control typically reaches 1500-3000 Hz bandwidth. Higher bandwidth makes it possible to use higher feedback gains to achieve stiffer and more precise position control.
Other key benefits compared to same price competitors
-Firmware (drive's internal software) upgradeable by user
-Easy set-up with guided tuning PC software
-Optional velocity mode for spindle use
-Arbitrary ratio input scaling and gearing (step multiplier/divider)
-High speed optoisolated inputs: up to 330 kHz step rate with standard optoisolator, and up to 2 MHz with socketet replacement
-One drive to rule them all: supports brushed DC, brushless DC and AC servo motors. Upgrade motors without need to replace drives.
Pricing
An introductory price of Fluxeon VSD-A is 150 EUR. This offer is valid for the batch of the first 100 units. Drives are available immediately and most are shipped within couple of work days after payments have been received. To ask details or to place order, please contact us at these email addresses:
About us
Granite Devices is a Finnish company that was found to produce this particular drive and develop this technology even further. Fluxeon VSD-A drives are made in Finland under high qualitity standards. We give 12 month warranty to our drives.
Best Regards,
Tero