Search found 14 matches

by J0nathan
Dec 31 2018 10:04am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 5955

Re: SPM VS IPM Motor - And Field weaken, is it worth it

With just appling a voltage not in phase with the bemf u are not lowering the bemf peak to peak voltage and there for u still have the Problem of uncontrollable current flow. U NEED id to activly lower the magnetic flow seen from the stator windings this will keep the bemf under the battery voltage...
by J0nathan
Dec 31 2018 9:33am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 5955

Re: SPM VS IPM Motor - And Field weaken, is it worth it

If a motor is freewheeling at speeds above kv*V and circuit is always closed then the generated voltage will be higher than battery voltage (which i think is what madin is referring to) so controller cannot put out any current.. This is a paradox to me.. Mustn't circuit be open? The back-emf voltag...
by J0nathan
Dec 31 2018 7:02am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 5955

Re: SPM VS IPM Motor - And Field weaken, is it worth it

Madin, your post would indirect mean that field weakening cannot be used? But it can? If the throttle is released at high speed and you get 1000w regen then that's a showstopper.. For no torque at zero throttle the controller just needs to apply some value of Id (for an SPM) or Id,Iq (for an IPM) w...
by J0nathan
Aug 21 2017 2:55pm
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 388
Views: 61735

Re: VESC-controller

Have you thought about just putting ADCs right next to current sensors of some description? That's how I did it in the pictured one, attached. The design is here: https://github.com/jonblissett/motor-high-current-sensors 6 channels in total: 4 current, 1 high voltage, 1 spare e.g. for temperature. S...
by J0nathan
Jun 26 2016 6:49am
Forum: Items for Sale - New
Topic: Assembled Hi-Power LiPo battery packs - any interest?
Replies: 565
Views: 105122

Re: Assembled Hi-Power LiPo battery packs - any interest?

At the TT-zero this year we had a good production line going making these. The batteries arrived only a couple of weeks before we left to the paddock, so needs must. I discussed it with Chris briefly, but went for a slightly different design. Here's the end result: TT_batteries_UoN02_2.jpg The brigh...
by J0nathan
Jul 11 2014 6:32pm
Forum: E-Bike Non-hub Motor Drives
Topic: Low power bike with Turnigy 80100 motor
Replies: 19
Views: 3009

Re: Low power bike with Turnigy 80100 motor

I just had another look at the controller...had my hands full with another project all week, sadly not my equipment: DSC09557.JPG Anyway, the first thing I spotted was that one pair of MOSFETs (phase B to DC-) were short circuited. Not sure how I didn't spot that the first time! I de-soldered them a...
by J0nathan
Jul 07 2014 5:49pm
Forum: E-Bike Non-hub Motor Drives
Topic: Low power bike with Turnigy 80100 motor
Replies: 19
Views: 3009

Re: Low power bike with Turnigy 80100 motor

Yes, the first time I set it up I used my lab PSU and adjusted the sensor position to get the lowest current. At that point it was in star - about 2.5A: DSC01729.JPG I do have a video of that test with oscilloscope attached, but it's pretty generic so probably not worth posting. Just remembered, I v...
by J0nathan
Jul 07 2014 5:34pm
Forum: E-Bike Non-hub Motor Drives
Topic: Low power bike with Turnigy 80100 motor
Replies: 19
Views: 3009

Re: Low power bike with Turnigy 80100 motor

I got the controller I linked to in the first post - the 30A 48V ecrazyman one. It worked for about 10-20 charges before suddenly not responding...

Edit: Sensors are 60 degree spaced, middle one flipped.
by J0nathan
Jul 07 2014 5:03pm
Forum: E-Bike Non-hub Motor Drives
Topic: Low power bike with Turnigy 80100 motor
Replies: 19
Views: 3009

Re: Low power bike with Turnigy 80100 motor

I forgot the mildly interesting bit - here's how I mounted the sensors on the motor:
DSC01734.JPG
Simple PCB, with slots to move it to adjust the timing...

But still no progress with getting the controller to work again :(
by J0nathan
Jun 27 2014 11:28am
Forum: E-Bike Non-hub Motor Drives
Topic: Low power bike with Turnigy 80100 motor
Replies: 19
Views: 3009

Re: Low power bike with Turnigy 80100 motor

I keep forgetting to update this... The controller suggested from eBay worked well - I did change the motor back to delta termination and the performance was quite reasonable. My sister was using the bike to commute to work, however quite recently the controller seems to have died. When I switch the...
by J0nathan
May 12 2013 12:02pm
Forum: E-Bike Non-hub Motor Drives
Topic: Low power bike with Turnigy 80100 motor
Replies: 19
Views: 3009

Re: Low power bike with Turnigy 80100 motor

Yes, I think it was made by currie. Thanks for the confirmation that that's the right controller. There are similar looking ones from other eBay sellers, so is the one I linked to the cheapest one and do you normally get customs charges on them? I don't mind paying the VAT, it's the £10.50 fee from ...
by J0nathan
May 07 2013 5:37pm
Forum: E-Bike Non-hub Motor Drives
Topic: Low power bike with Turnigy 80100 motor
Replies: 19
Views: 3009

Re: Low power bike with Turnigy 80100 motor

I don't remember what the ratio of the gearbox is, but we can work it out given that I measured the max speed as 17.6mph (7.87 m/s). Wheel diameter is indeed 26", so 1.92m circumference, 130*23.5/(7.87/1.92*60)=12.4, so the ratio is about 12.4 :1. I'm confident that the controller didn't fail due to...
by J0nathan
May 07 2013 4:13pm
Forum: E-Bike Non-hub Motor Drives
Topic: Low power bike with Turnigy 80100 motor
Replies: 19
Views: 3009

Re: Low power bike with Turnigy 80100 motor

Thank you for the reply, that sounds promising. I'm not at all concerned by having to add sensors to the motors, since from various posts on this forum it doesn't appear to be at all difficult. If I double the voltage by putting the batteries in series, as mentioned in the original post, then I gues...
by J0nathan
May 07 2013 3:05pm
Forum: E-Bike Non-hub Motor Drives
Topic: Low power bike with Turnigy 80100 motor
Replies: 19
Views: 3009

Low power bike with Turnigy 80100 motor

My mum recently asked me to make an e-bike for her to use, just for short trips. A long time ago I bought one of the large turnigy 130kV motors, intending to use it on my own bike however I never got round to it. More recently someone gave me a bike conversion kit with a broken controller. Unfortuna...