[HINT] Some IC or schematics for 3phase spindle drive - Page 1
Forum section: electronics / projects

author: Ultron
author_rank: Contributor
timestamp: August 26, 2015, 09:21:46 pm
content: Can someone suggest me some schematic or a IC for 3 phase drive? (so called Inverter, in Italy)Specifics:- 3phase- 220V AC (up to ~320 DC after the rectifier)- MOS or IGBT drivers- speed control- current controlThe spindle power is 1,1KW

author: CM800
author_rank: Frequent Contributor
timestamp: August 26, 2015, 11:30:00 pm
content: Unless you are very proficient at micro-controller programming and have a good bit of money to spend + good at power electronics and signal / dsp work, it would probably be better to buy one.AC Motor drivers are -not- easy to make, especially when you are dealing with over 200V. (Gate drive and other things become an issue)This is coming from someone who works in the servo drive industry (3 phase BLDC motors and BLAC motors + accurate control systems) We have been looking into developing our own but decided to outsource for now due to costs.If you just want to make something as a hobby / for a bit of fun, I suggest starting off with a DC 4-quadrant motor driver, then move on towards a Switch mode power supply, maybe try making a PFC controller and then try making a low voltage 3 phase motor driver before moving up to high voltage, this would help you out and bring you along the tech tree.DC motor driver - gives you a good grounding for understanding full bridge power systems.Switch Mode - advances you as you have to look into higher frequency switching (20-100kHz) of a medium/high voltage bridge.PFC - will advance you into looking at PWM and waveforms to simulate a sine wave (make the PFC using a microcontroller rather then A PFC chip.)LV 3 phase motor driver - now try dealing with 3 half-bridges rather then just 2. Learn how to do the phasing and controls.HV 3 phase motor driver - just add what you learned in making the switch mode (high voltage, higher frequency switching) to the LV 3 phase motor driver (mostly just changing the power stage here, maybe some additional safety features)This is just my 2 cents! (I know not of how experienced you are already)

author: rs20
author_rank: Super Contributor
timestamp: August 27, 2015, 12:35:20 am
content: Correct me if I'm wrong, but this is the sort of thing you'd use an off-the-shelf VFD for?

author: rvalente
author_rank: Frequent Contributor
timestamp: August 27, 2015, 03:03:12 am
content: Low cost and trusty VFD/Inverters Allen Bradley and Yaskawa.If you wanna develop your one, I suggest DSPIC33 MC series and IRAMS power module....

author: H.O
author_rank: Frequent Contributor
timestamp: August 27, 2015, 06:18:28 am
content: If the goal is to get the spindle running and using it for its intended purpose then just buy a VFD for it. At those power levels they don't cost much, especially NOT the ones that are usually [url0=http://www.ebay.com/itm/NEW-2-2KW-3HP-VFD-10A-220V-SINGLE-PHASE-VARIABLE-SPEED-DRIVE-VSD-DRIVE-INVERTER-/291484265996?hash=item43ddd0ee0c]sold with those particular spindles. ($130 including shipping, for a 2.2kW unit).They aren't the best quallity and the documentation sucks but they are ALL over the place among the DIY CNC crowd so help on configuration etc shouldn't be too hard to find/get. Or, if you want something better, get a second hand Siemens Micromaster, Yaskawa/Omron, ABB, Lenze or whatever capable of 400Hz and be done with it. I've got the 2.2kW water cooled spindle and bought a used Danfoss VFD for it. It's going to cost you a lot less than designing and building your own.

author: Ultron
author_rank: Contributor
timestamp: August 27, 2015, 11:46:06 am
content: Ok, I have a medium skill for PIC32 and dsPIC programming, and very good skill for make PCB, Power electronics, welding and more. No problem for homebrewing anything about electronics.You can also suggest a complex project, with MCU and firmware.I got one IGBT complete H-bridge drive (600V - 20A) just waiting to be used...

author: rvalente
author_rank: Frequent Contributor
timestamp: August 27, 2015, 01:29:52 pm
content: Quote from: Ultron on August 27, 2015, 11:46:06 amWith one IGBT you won't even get started, you'll blow this guy in the first tests, get the Microchip dev boards as suggestions (DSPIC MC DEM).Do not forget that industrial inverters have the logic controls galvanic isolated to the power and that is the hard part....

author: awallin
author_rank: Frequent Contributor
timestamp: August 27, 2015, 01:49:51 pm
content: Quote from: rvalente on August 27, 2015, 03:03:12 amI played with this idea a while (wow almost 10 years!) back:http://www.anderswallin.net/2006/06/first-steps-with-brushless-servodrive-microchip-dspic-irf-irams/my goal was to drive an AC servo that has both hall-sensor and quadrature encoder feedback. It's not a beginner project and I did not have time/energy to develop it much further than a spinning-motor-demo...I agree with the others that a 200-500eur VFD is the simple solution to drive this type of motor. The ones with "vector-drive" can compensate at least partially for variable load even if they are sensorless (i.e. the only feedback comes from measuring current/voltage on the phases, no Hall or encoder feedback).

author: Moriniman
author_rank: Contributor
timestamp: August 27, 2015, 01:57:43 pm
content: I've been running my Lathe from one of the Huanyang VFDs for years, the mill and other machines followed later and I wouldn't hesitate to buy another for the money. The more recent printed manuals aren't much worse than the ones for many other VFDs and it's actually a whole lot better than the one for the Eurotherm I have on my bandsaw.The input bridge is generously rated, even for single phase input and the bus capacitors and main power devices are Japanese branded.I've built VFDs in the past with both analogue and digital PWM systems. The latter used a hand programmed EPROM to hold the sine wave tables at various amplitudes and binary counters and comparators to generate the PWM. That was always the easy part! Gate drives with pulse be pulse current limiting and controlling di/dt induced voltage spikes was always more trouble.Working out what went wrong when all you've got left is a pile of charred components is not easy!

author: Ultron
author_rank: Contributor
timestamp: August 27, 2015, 06:59:02 pm
content: For example...

author: Ultron
author_rank: Contributor
timestamp: August 27, 2015, 07:27:39 pm
content: Ok, this one could be the best of all.Simple, with IGBT, but i'll replace the old 555 and the TTL 74175 D flip-flop counter, with one 8 BIT MCU.

author: H.O
author_rank: Frequent Contributor
timestamp: August 27, 2015, 08:40:55 pm
content: I love that Prof.dr.Godfriedschematic with IRF540 MOSFETs across a 600VDC bus.... what am I missing?

author: Ultron
author_rank: Contributor
timestamp: August 27, 2015, 08:57:09 pm
content: Quote from: H.O on August 27, 2015, 08:40:55 pmin fact...