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Model Forum / Radio Controlled / Land Models / March 2005Never got one response, But here's the answer
Posted twice a question regarding reversing the rotation of a Novak SS5800. Never got one response. If anyone give a crap, here is the answer quoted from the E mail I finally got from Novak. <SNIP> No, it takes much more then just switching the wires, we have to make special software for them to run reverse rotation. Please let me know if you have any further questions, we are glad to help. Complete Product return, service, and pricing information can be found in the Customer Service Section of our website. Instruction manuals can be found in the Download Section of the website as well. All links are listed below. Thank you, Charlie Suangka Novak Electronics 17032 Armstrong Ave Irvine CA 92614 www.teamnovak.com phone 949-833-8873 fax 949-833-1631 charlie@teamnovak.com Customer Service Section : http://teamnovak.com/cust_serv/cust_new.html Technical information section: http://teamnovak.com/Tech_info/index.htm Instruction Manual Section: http://teamnovak.com/Download/index.htm Product information Section: http://teamnovak.com/products/index2.htm <SNIP> Just so you know. John Krueger Formerly known as: Dirtnap Final Reproach TheLorax John Smallberries Johnny YaYa > Posted twice a question regarding reversing the rotation of > a Novak SS5800. Never got one response. [quoted text clipped - 51 lines] > John Smallberries > Johnny YaYa Thanks for the forward. A lot of people simply won't reply if they don't know the answer. I think you simply stumped us. Justin >> Posted twice a question regarding reversing the rotation of >> a Novak SS5800. Never got one response. [quoted text clipped - 56 lines] > > Justin I agree with Justin It's better to get no answers, than a bunch of wild un-educated guesses. I did hear in another forum, that the ss5800 has some hard advance timing built into the motor, between the Hall sensors and the field coils. So you can't just change two of the power wires and two of the sensor wires to reverse it. Thanks guys. I thought no one liked me. Apparently they did not tell you how neither,maybe it cannot be done and that is why no one bothered to answer.What is the application needed for the reverse rotation? > Apparently they did not tell you how neither,maybe it cannot be done > and that is why no one bothered to answer.What is the application > needed for the reverse rotation? In my aircraft that run brushless, if you add a gear reduction unit, or switch to a pusher setup, you can reverse motor rotation by switching any two power wires. This is easy and commonly done as long as there are not rotor position sensors. (As I know now). I have a Aveox brushless in a plane that has a sensor for locked rotor only. It can be reversed. Locked rotor protection is important for belly landings or any time the prop can hit or get stuck on something. The reason I was asking was for potential use of two SS5800 used in a Clod or some type of truck. One motor has to run reversed. I don't really have a specific use planned, was just thinking about possible uses for the two I have now. Maybe I will use a dog gear and run them in my Villain. Just read the RC Car Action article about Kevin trying to put one in his Bruiser. He struck out too. Oh well. John When a speed controller provides its current output does it not throw it + and - polarity? Can you just reverse the polarity of the motor? And if not can you just change the leads on the armature to th commutator? (Reversing the wind) If it is coreless(brushless)maybe you can reverse the wind on the stador or 180 degree the magnets? (depending on what size and type of motor. I hope this helps. I am a member of EASA (electrical apparatus service association) and i could ask them if nessicary. Really do not understand why no one else would help?Possibly because of the influx of all the forums and msg boards makes this group a dinosour.:-) But anyway i still watch this group. Atom > When a speed controller provides its current output does it not throw > it + and - polarity? [quoted text clipped - 12 lines] > > Atom The brushless motors need a three phase supply to work so simply reversing the polarity of the wires will not help (the 3 coils fire in a sequence), as John said the sensors are probably hard wired for mechanical advace in one direction. The magnets are on the rotor in a brushless motor so you can't easily change them and that wouldn't make any difference to the rotation only changing the firing pulses going to the coils will do that. I suppose you could probably do it by opening the motor and rewiring the sensors but it'd be a fudge at best and probably require a new PCB for them to sit on and then you'd need to adjust the programming of the controller to account for the advance now being retardation. Still I suppose Novak could come up with a kit to do it consisting of a new sensor board, instructions to change the wiring and new software for the controller but the potential sales are likeley to make that a non starter. Chris Chris hit it on the head. I have been using brushless motors for many years. I am a woodworker. Nearly all the tools in my shop are three-phase. Every time I install a new machine in the shop, I have a fifty-fifty chance of the motor running backwards. If it does, I just switch the two "hots" and all is well. I have done the same with my planes. There simply is no need to go through with modifing the Novak system I have. Quite frankly, It was just a whim, just a thought that ran away from me. Today I installed one of the SS5800 set-ups in my XXX buggy. The snow is mostly gone here in Milwaukee and the sand at the beach has been calling to me. Paddle tires are mounted and the sealed motor works hard and shrugs off the sand. It is a great set-up dune running. The other SS5800 box is still looking for a home. not sure what vehicle gets it. John John, couldn't you try to fabricate a mount to fix the motor to the opposite side of the gearbox in the Clod/truck? If you have a machine shop it's not too difficult to re-drill the mounts all the way through and create a support structure for the motor providing it's not going to interfere with the suspension, I can't help much as it's been a long time since i've seen a Clod. Another idea to try would be to rotate the gearbox 180 degrees, I saw that done to a Schumacher Cougar in the 90's and an RC10 in the 80's to improve the weight distribution. CHris 'Suppose I could, I also think someone makes a dog gear attachment for the clod that lets both motors run in the normal direction. But as I said in last post, I am not going to. Truth is, things have changed a lot over the Easter weekend. I sold the old Clod Buster on Saturday. Gone! Also... The weather has finally got warmer here in Beer Town. The sand at the beach is mostly exposed and dry, I have mounted one SS5800 in my XXX buggy, the other is in my XXXT. Both have paddles mounted and ready for action. Just got a touch of the flu left now, a day or two and I should be at the beach. Hope the weather holds out. I will post a few pix in the binaries groups of the sand beasts. John > John, > couldn't you try to fabricate a mount to fix the motor to the opposite [quoted text clipped - 14 lines] > > CHris I trippl but plug Ewock style dare you to run your washer 180 out..... youre shure u aint kevin? i didnt,t want to help cuz i wants paid for me backwards bruiser tooo!!!\ good luck cuz. patrick > youre shure u aint kevin? i didnt,t want to help cuz i wants paid for me > backwards bruiser tooo!!!\ > good luck cuz. > patrick Why are the Web TV guy the ones no one can understand? (Troll?) |
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