Search found 937 matches

by The7
Aug 28 2009 8:04pm
Forum: E-Bike Technical
Topic: Improving speed on my 37V 250W bike
Replies: 19
Views: 5273

Re: Improving speed on my 37V 250W bike

The motor says "Brushless without Hall Sensor". This means that there is no Hall Sensor in this motor. This is a pedal first type. The 4 control wires are for 3-phase emf detection using an extra 3-phase control windings. The controller that you bought is not the correct type. You need a special con...
by The7
Oct 12 2008 8:45am
Forum: E-Bike Technical
Topic: Inside a GM 48v 1000w controller
Replies: 14
Views: 1120

Re: Inside a GM 48v 1000w controller

That's right, 2 high side and three low side FETs! Any idea why they might want to do this? Maybe they mostly switch the high side FETs, so traded lower switching loses for higher conduction loses on the top side... but seems a bit strange to me. It also sounds a bit strange to me because the high ...
by The7
Oct 08 2008 8:59am
Forum: E-Bike Technical
Topic: Low voltage DC inverter for more speed ?
Replies: 18
Views: 1503

Re: Low voltage DC inverter for more speed ?

This is DC-DC converter that I used for an experiment to make 36 V batteries deliver a constant 43 V, even under load. Most DC-DC converters are step down rather than step up, and most are lower current than we need for motors, so I ended up building this one myself. Nick Wonder if your step-up dc-...
by The7
Sep 28 2008 7:55am
Forum: E-Bike Technical
Topic: Golden Motor Regen BLDC 48V controller
Replies: 60
Views: 9006

Re: Golden Motor Regen BLDC 48V controller

One of my favorite resistors is found right in the kitchen ... A heating element from the stove! :shock: http://71.18.69.167/endless-sphere/40_ohm.JPG This element is a 40 ohm resistor that can handle plenty of amps. Great for cooking your burgers too (while braking). Some maths here! This 40 ohm s...
by The7
Sep 18 2008 1:11pm
Forum: E-Bike Technical
Topic: high power/high speed BLDC controller build
Replies: 111
Views: 10977

Re: high power/high speed BLDC controller build

dirty_d wrote:this is the driver board i made for it, if anyone wants the schematic or pcb layout files just ask.
Could you show the schematic diagram?
by The7
Sep 07 2008 6:50pm
Forum: E-Bike Technical
Topic: New Infineon v Old PIC Controller - A 48V Bafang PMGR Test
Replies: 31
Views: 3881

Re: New Infineon v Old PIC Controller - A 48V Bafang PMGR Test

While my new Infineon is super on the Bafang, I tried Nogwins wire combos on my Crystalyte 20 amp 36-72 volt old analog and it didnt work at all! I dont understand why the Crystalyte was so poor!??? I need to know incase its a bad controller and I get another motor. BTW I did try all spreadsheet co...
by The7
Sep 03 2008 10:24am
Forum: E-Bike Technical
Topic: Known to Work Brushless Motor/Controller Wiring Diagrams
Replies: 135
Views: 50536

Re: Known to Work Brushless Motor/Controller Wiring Diagrams

Please also state whether the "reverse' link is CLOSE or OPEN if there is such a link in the controller.
by The7
Aug 31 2008 10:01am
Forum: E-Bike Technical
Topic: Kelly controller hook up?
Replies: 9
Views: 722

Re: Kelly controller hook up?

I use a Kelly brushless controller, A 100 amp controller is rated 100 amps peak phase current not battery current. But a full on and at high RPM's the battery current could be up to 1.4 times phase current. At low RPM's battery current will be less, much less than the peak phase current. Seems that...
by The7
Aug 31 2008 9:52am
Forum: E-Bike Technical
Topic: Infineon XC846 72V 45 Amp Controller
Replies: 234
Views: 65508

Re: Infineon XC846 72V 45 Amp Controller

ZapPat wrote: Almost as though it might have to do with some one-time initialisation code not always doing the same thing.
Seems this could be the good and the bad!
by The7
Aug 31 2008 9:44am
Forum: E-Bike Technical
Topic: New Infineon v Old PIC Controller - A 48V Bafang PMGR Test
Replies: 31
Views: 3881

Re: New Infineon v Old PIC Controller - A 48V Bafang PMGR Test

Knuckles wrote: Also, Keywin told me the Infineon "auto detects" 60 or 120 degree hall phase advance so I guess this is a "very smart" lil MCU.
IMO. Don't think this is good because any high voltage spikes/ noise could confuse the Infineon.
by The7
Aug 29 2008 10:13am
Forum: E-Bike Technical
Topic: high power/high speed BLDC controller build
Replies: 111
Views: 10977

Re: high power/high speed BLDC controller build

The7, Many thanks for that. You've neatly summed up in one post stuff that I've spent hours trying to find using Google! Do you think it would be OK to fit the sensors in the gaps between the pole pieces or should I mill out grooves in the stator to accept them? Jeremy From some previous posts, bot...
by The7
Aug 28 2008 6:06pm
Forum: E-Bike Technical
Topic: high power/high speed BLDC controller build
Replies: 111
Views: 10977

Re: high power/high speed BLDC controller build

For info, the Tower Pro 5330 has fourteen magnets (7 pole pairs) and twelve stator windings. My simple logic tell me that if I fit three Hall sensors between adjacent stator poles (small ones will "just" fit) then I should have 120 degree timing as required for most simple controllers. Jeremy For f...
by The7
Aug 27 2008 12:52pm
Forum: E-Bike Technical
Topic: OK explain this to me
Replies: 27
Views: 2950

Re: OK explain this to me

Here is a diagram of my hall sensors. If you look closely you will see two on the outside are face up and the middle one is face down. I would really like to know why this makes a difference. sensors.JPG Any change if you could take a photo of the inside of your motor in order to determine the effe...
by The7
Aug 27 2008 12:44pm
Forum: E-Bike Technical
Topic: OK explain this to me
Replies: 27
Views: 2950

Re: OK explain this to me

docnjoj wrote: I just went thru this with my Crystalyte/Bafang combo! I too have a high static run (no load) amp draw. It took about 1.5 hours,
otherDoc
Do you mean 1.5 amp?
by The7
Aug 27 2008 12:27pm
Forum: Technical Reference Area
Topic: Version 2 Crystalyte Controller information
Replies: 387
Views: 35272

Re: Version 2 Crystalyte Controller information

b)If so, at 50kmh top speed on flat (about 41% of no-load speed), the 3 wheeler is limited by the battery current limit of 35A. The motor current could be about 2.4 times of the battery current (about 85 A). And it will cause an high current ripple in these 100V capacitors (order of 85A) c) If so, ...
by The7
Aug 27 2008 12:27pm
Forum: E-Bike Technical
Topic: Version 2 Crystalyte Controller information
Replies: 415
Views: 43717

Re: Version 2 Crystalyte Controller information

b)If so, at 50kmh top speed on flat (about 41% of no-load speed), the 3 wheeler is limited by the battery current limit of 35A. The motor current could be about 2.4 times of the battery current (about 85 A). And it will cause an high current ripple in these 100V capacitors (order of 85A) c) If so, ...
by The7
Aug 26 2008 7:40pm
Forum: E-Bike Technical
Topic: OK explain this to me
Replies: 27
Views: 2950

Re: OK explain this to me

I AM 0Z wrote: maximum current is 13.5 amps at full throttle no load. .
This no-load current is TOO HIGH.
by The7
Aug 20 2008 4:43pm
Forum: E-Bike Technical
Topic: I confirm.. IRF4110 mosfet handle 100.8V 75A
Replies: 2
Views: 1095

Re: I confirm.. IRF4110 mosfet handle 100.8V 75A

Vow, 7500W input power!
by The7
Aug 20 2008 4:34pm
Forum: Technical Reference Area
Topic: Version 2 Crystalyte Controller information
Replies: 387
Views: 35272

Re: Version 2 Crystalyte Controller information

But you've brought up the interesting point of motor current can be higher than battery current, something I only recently became aware of, can you go further into how thats possible? Let us use an simple circuit for illustration. . The motor is simplified as an L and R as shown in the circuit B. T...
by The7
Aug 20 2008 4:34pm
Forum: E-Bike Technical
Topic: Version 2 Crystalyte Controller information
Replies: 415
Views: 43717

Re: Version 2 Crystalyte Controller information

But you've brought up the interesting point of motor current can be higher than battery current, something I only recently became aware of, can you go further into how thats possible? Let us use an simple circuit for illustration. . The motor is simplified as an L and R as shown in the circuit B. T...
by The7
Aug 20 2008 1:00pm
Forum: Technical Reference Area
Topic: Version 2 Crystalyte Controller information
Replies: 387
Views: 35272

Re: Version 2 Crystalyte Controller information

at 82.4volt no load rpm of 978rpm in 26" rim equates to 121km/hr with v2 At 35amp with my 3 wheeler at 82volt getting a bit over 50km/hr in 26" rim on flat road with fairing, Have been testing x5303 running on 86volt 35amp v2 controller, Top speed with wind behind trike and slight downhill was 79km...
by The7
Aug 20 2008 1:00pm
Forum: E-Bike Technical
Topic: Version 2 Crystalyte Controller information
Replies: 415
Views: 43717

Re: Version 2 Crystalyte Controller information

at 82.4volt no load rpm of 978rpm in 26" rim equates to 121km/hr with v2 At 35amp with my 3 wheeler at 82volt getting a bit over 50km/hr in 26" rim on flat road with fairing, Have been testing x5303 running on 86volt 35amp v2 controller, Top speed with wind behind trike and slight downhill was 79km...
by The7
Aug 19 2008 5:12pm
Forum: E-Bike Technical
Topic: Controller or what?????
Replies: 13
Views: 639

Re: Controller or what?????

"It also has a no load amp draw of over 12 amps at full throttle!"

It sounds to be very high for no-load!!

At what battery voltage?
by The7
Aug 17 2008 5:18pm
Forum: E-Bike Technical
Topic: 36V/48V 600W sensorless and brushless controller
Replies: 27
Views: 3253

Re: 36V/48V 600W sensorless and brushless controller

How does it road test on ebike when compared with the sensor one?
by The7
Aug 15 2008 5:08pm
Forum: E-Bike Technical
Topic: OK explain this to me
Replies: 27
Views: 2950

Re: OK explain this to me

I would concur with dirty_d.

On the other hand, if the sensors were physically spaced 120 deg apart, flipping the centre sensor will give an effective spacing of 60 deg.