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  1. PhoenixOSU

    lead angle hardware solution??

    I've been working on how to create lead angle delay with hardware on an ASIC, like how it seems to have been done on the Toshiba TB6586FG (the datasheet has a block diagram but doesn't show how they did it). Does anyone here have an idea how they accomplished a phase delay in the hall signals...
  2. PhoenixOSU

    large brushless motor for car sized EVs?

    I've been looking at motors for doing car conversions and all I can really find is brushed DC motors and separately excited DC motors, but no BLDC in the 25-50 hp range. Does anyone know of one such motor? I guess an alternative is to use 8 of those large 12kw RC motors with some kind of crazy...
  3. PhoenixOSU

    controller current thresholds

    I am curious to know what you guys (especially the engineers here) think of over current thresholds in a controller, how many and which currents matter? There is of course motor current and battery current which can be measured. The Kelly seems to use two thresholds, but are they for battery or...
  4. PhoenixOSU

    kelly KEB config program version 3.1 not working

    I am trying to get the Kelly software to work on my PC for the KEB controller and it will not install, I get an error message in windows xp an windows 7. The KBL software works fine. Is anyone else having this issue? Does someone have a working copy of the install file for perhaps version 3.0?
  5. PhoenixOSU

    trouble with relays

    I am working with some relays to connect / disconnect my 72V SLA battery pack from my Kelly controller, I put 3 of them in parallel in series with the positive line off the pack. When I connect everything up the relays are off and there is no power to the controller, when I apply 12V to the...
  6. PhoenixOSU

    MOSFET Rds rating

    I've been looking at some TO-247 FETs lately, and I really like my IRFP MOSFETs, but IXYS has some nice ones as well these days. But the difference is that the RDS_ON is rated at 500mA, whereas the IRF FETs advertise their RDS_ON at 90A. By how much does RDS_ON change over the range of ID? I...
  7. PhoenixOSU

    What is the range of battery votlage EV people use?

    I'm curious, what range of voltage do most EV builders an enthusiasts use? I think 24 is about the lowest thing I've seen before "too gutless to be useful" becomes a reality barring parallel motors. But what of the high end? I was thinking probably most people don't go over 100V? 150V? 200V?
  8. PhoenixOSU

    forum page for controllers?

    I could be totally wrong here, but I think it might be a good idea considering the volume of discussions on the topic to have a section for discussions on motor controllers like we have for battery technology. It seems that there are several DIY projects on this forum and a few electrical...
  9. PhoenixOSU

    BLDC boost controller? help wanted

    I'm playing around with the idea of a boosting controller, ideally one that can operate in both buck and boost modes. A bit of background for idle readers, most controllers operate as either synchronous and asynchronous buck controllers, so the motor sees an average voltage between the battery...
  10. PhoenixOSU

    SLA batteries for moped

    I've seen a few different brands for SLA batteries in the 20ah ish range. I have room for 6 22ah batteries under the seat, and I'd like to use that space fully, I have found a few candidates and can't decide which is best. universal UB12220 Ritar RT12220EV Tempest TD22-12 I have heard from...
  11. PhoenixOSU

    5v hall sensor question

    so, i have been testing my hall sensors and when i apply 5V ot the sensors, I only get small fluctuations in the range of 10mv, they dont seem to be working 0 to 5 as they should, any idea why? my motor is a 6kw kelly hub.
  12. PhoenixOSU

    motor commutation sequence question

    I have a few questions about the commutation sequence for BLDC motors using hall sensors, born partly out of my own ignorance due in no small part to relying on data sheets and app notes for my information. It seems to me that there is some knowledge in the industry that is assumed to be known...
  13. PhoenixOSU

    Controller designs using ASICS

    Has anyone here seen or done a controller design using and ASIC (such as those by TI, Toshiba, Fairchild, ON Semi, etc)? Some of these have integrated FET drivers (I'm not a fan of this), some have sinusoidal drive (Toshiba), and some like TI are designed for 4 quadrant operation, are these ever...
  14. PhoenixOSU

    regen switching shceme

    I have been researching schemes for switching the MOSFETs in a 3 phase bridge for BLDC motors and have come across a question. When switching synchronously I can regenerative brake very easily and motor fairly well, but shorting the lower MOSFET while motoring seems undesirable, and in...
  15. PhoenixOSU

    Castle vs Kelly questions

    I know this may sound like a stupid question, and in my defense there is some outside influence in my asking, so here goes. The Castle Phoenix HV 110 is a 50Vmax 110Amax (5.5Kw) controller for $215-$230 The Kelly KBL48201 is a 48V 100A (4.8kw cont 9.6kw burst) controller for $349 The kelly is...
  16. PhoenixOSU

    charge at 72V or switch to parallel and charge at 12V?

    I'm building a 72V SLA AGM battery pack and have found that 72V chargers are in the range of $500, so I was wondering how you guys get around this? I'm considering building my own charger if need be, or finding a way of easily on-the-fly reconnecting the batteries into a parallel configuration...
  17. PhoenixOSU

    Why are cyclists so keen to race me?

    Every now and then, like today, I'll come across and usually breeze by a cyclist on my electric bike. And most of the time on campus they just fall behind in my rear view mirror. But every now and then one will suddenly decide that it is their god given right to try to prove the size of their...
  18. PhoenixOSU

    MOSFETs

    I did some price checking on MOSFETs from IRF as a result of a discussion in another thread. I came up with some results and found that there are a lot of options in TO-220 packages and others. Check these out. Also, buying direct from IRF reduces the cost enough that I don't ever intend to buy...
  19. PhoenixOSU

    6 phase hub motor?

    I did some searching and found that RMartin makes a moped with a "6 phase" motor, normally BLDC motors are 3-phase, 6-phase would greatly increase efficiency, though most controllers only do 3, so I'd make my own! Anyway, if anyone knows where buy just the motor or who makes it, or if it even is...
  20. PhoenixOSU

    Has anyone used batteryspace.com?

    I'm looking for a good source for SLA or possibly NiMH batteries for a bit of a budget battery pack and I remember using http://www.batteryspace.com for a pack for a design project a little over a year ago, the cells preformed perfectly, chargers were sketchy, but worked fine and never caused...
  21. PhoenixOSU

    comprehensive guide to DIY BLDC controller?

    I have been writing a design log / app note as I design my controller in a modular fashion, updating as i go through each piece. Would anyone have a use for this? I've seen some interest in older posts about people wanting a controller design that is modular so that people could replace the...
  22. PhoenixOSU

    calling experts, BLDC motor waveforms

    I've noticed in research that different controllers use different waveforms to drive brushless DC motors. The optimal from what I learned in undergraduate coursework is a sinusoidal (vector control likely required) waveform, but there are also trapazoidal, square, and maybe a few other...
  23. PhoenixOSU

    hall sensor output waveforms?

    I've never had the opportunity to power on some BLDC motor hall sensors and see the output of the sensors, but from all the documentation I've seen they are square waves (fast rise fall times as the rotor goes past), but is this so? I am wondering because I want to know if I need to put a...
  24. PhoenixOSU

    custom design (open source) 48V BLDC controller

    I've been working on a 48V BLDC motor controller to use in my moped project (because I think I can do a pretty good job and its fun). The goal is to get it working and integrate the 12V dc-dc into the controller and have the design be a prototype for a 72V design down the road. My hope is to get...
  25. PhoenixOSU

    Help identify this hub motor

    I have an e-bike called an EasyRider 350 made in Mill City Oregon, and it is a nice bike for what I paid for it, but now I'm interested in leaning more about what's really making it go. So I have attached a few pictures of the motor which is said by the seller to be a 350W stepper motor, and...
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