Search found 88 matches

by Lagoethe
Apr 27 2019 4:46am
Forum: EBike Technical
Topic: Buzzing not spinning
Replies: 5
Views: 335

Re: Buzzing not spinning

I tried new sequences of my hall sensor.

It finally worked.

A thousand thanks for your help.
by Lagoethe
Apr 22 2019 10:29am
Forum: EBike Technical
Topic: Buzzing not spinning
Replies: 5
Views: 335

Buzzing not spinning

Hello, A few mounths ago i bought an non-working E-Bike I could makethe motors and having torque,using the walk function of it, but the PAS was destroyed. I replaced the PAS sensor, and then i discovered that the controller wasn't giving him its 5V. So i also bought a controller and a throtle. My gu...
by Lagoethe
Jan 20 2019 7:01am
Forum: Motor Technology
Topic: Issue with PAS
Replies: 2
Views: 398

Re: Issue with PAS

Thanks for your answer Below a little update considering your answer: The former sensor is a DH sensor http://www.kingmeters.com/project/dh-sensor/ Apparently it's a doublehall sensor On the new one I got only very few information cause i don't have the tool to dismount the crank housing/crank set (...
by Lagoethe
Jan 19 2019 12:10pm
Forum: Motor Technology
Topic: Issue with PAS
Replies: 2
Views: 398

Issue with PAS

Hello, I bought a non-working electric bakfiets (as we call). The former owner had the cable from his PAS torn off, and he had no time to repair it. He had only time to change the PAS, but the bike wasn't working anymore. So here is where i am now: - The controller: -36VDC -12A -Speed set 1.1-4.2VDU...
by Lagoethe
Mar 07 2012 2:26am
Forum: Motor Technology
Topic: FCM 8201 - Over voltage protection of motor driver
Replies: 5
Views: 1855

Re: FCM 8201 - Over voltage protection of motor driver

I'm waiting for last components.
They should be home next week.
Have you got some schematics of your boards/bread boards?

Have a nice day (I can post mine in eagle if someone want)
by Lagoethe
Feb 10 2012 3:01am
Forum: Motor Technology
Topic: Plug and Play Motor
Replies: 3
Views: 669

Re: Plug and Play Motor

Talking about plug and play motor was a very bad idea. In fact I'm looking for motor seither DC motor or sensored BLDC,which would have nearly the same characteriscs as Hub motor: rated at ~24/48 V and handles 1000 to 1500W. What suprises me is that I don't find cheap motors like this. In fact I don...
by Lagoethe
Feb 09 2012 9:01am
Forum: Motor Technology
Topic: Plug and Play Motor
Replies: 3
Views: 669

Plug and Play Motor

Hello, From what I have learned in this forum, there are two interesting technologies of motor for our purpose (e-bike): - dc motor. The motor controller "feed it" with a constant Voltage. - The BLDC / Brushless motor, which needs a much more complicated controller. This motor is 3-phases ...
by Lagoethe
Feb 07 2012 10:26am
Forum: Motor Technology
Topic: BLDC controller, highly advanced.
Replies: 51
Views: 5859

Re: BLDC controller, highly advanced.

Maybe you should start here: http://endless-sphere.com/forums/viewtopic.php?f=30&t=31804 Rhitee, you should check my last post on this thread. (and the attached file). I'm no master, but I really think it can be used to our purpose (you used to say the opposite a few months ago, i'd like you to...
by Lagoethe
Feb 02 2012 6:01am
Forum: Motor Technology
Topic: Calculating controller power input capacitance
Replies: 105
Views: 17276

Re: Calculating controller power input capacitance

I apologize to put this thread out of the grave but i'm designing a motor controler and I (once again) am blocked on the capacitors again! In the attached file there is a way to estimate the capacitor ripple current page 539: According to Fig. 5, the current stress on the DC-link capacitor is depend...
by Lagoethe
Jan 30 2012 10:52am
Forum: Motor Technology
Topic: Choosing the value resistance of shunt.
Replies: 2
Views: 616

Re: Choosing the value resistance of shunt.

I found a solution to my problem, but now I face another one. There are 3 levels of protection depending on V(I_In) If V(I_In)>2.5V after 3 pulses the short circuit current protection is enabled. FCM8201 closes all motor drives and latches the close status. In order to go back to restore output the ...
by Lagoethe
Jan 25 2012 8:47am
Forum: Motor Technology
Topic: Application note, MOSFET Power Losses
Replies: 6
Views: 1386

Re: Application note, MOSFET Power Losses

If someone masters MatLab
It seems there is a GREAT work to do with this: https://decibel.ni.com/content/groups/p ... simulation
by Lagoethe
Jan 16 2012 8:36am
Forum: Motor Technology
Topic: How many poles
Replies: 3
Views: 533

Re: How many poles

Hello My previous post was a little bit light, and there are some points you couldn't have guessed. First it's a brushless motor. (you had guessed) It's a hub bike motor. But I don't have the tool to open it. SO the only way I have to figure out how many poles there are without opening it is using t...
by Lagoethe
Jan 16 2012 3:45am
Forum: Motor Technology
Topic: How many poles
Replies: 3
Views: 533

How many poles

Hello

How can I know, how many poles I have on my motor?

Have a nice day
by Lagoethe
Jan 12 2012 5:23am
Forum: Motor Technology
Topic: FCM 8201 - Over voltage protection of motor driver
Replies: 5
Views: 1855

FCM 8201 - Over voltage protection of motor driver

Hello everybody, I am designing a new controller using the FCM 8201 chip which seem perfect fo our applications http://www.fairchildsemi.com/an/AN/AN-8201.pdf My problems come quite late in the application note: Page 14 "Braking and instantaneous speed/load change during operation of BLDC motor...
by Lagoethe
Dec 20 2011 9:10am
Forum: Motor Technology
Topic: Choosing the value resistance of shunt.
Replies: 2
Views: 616

Choosing the value resistance of shunt.

Hello I've discovered something that looks like a great chip: the FCM8201. http://www.fairchildsemi.com/ds/FC/FCM8201.pdf My problem is that I don't know how to design (value of R) the Shunt resistors used to measure the global current. Page 13 of the doc there are some explanations, which are a lit...
by Lagoethe
Dec 08 2011 3:25am
Forum: Motor Technology
Topic: Calculating controller power input capacitance
Replies: 105
Views: 17276

Re: Calculating controller power input capacitance

Doesn't sound right. The cap ripple would max at roughly 50% PWM I would expect. Max time to charge while motor is not powered, then max time to discharge when motor is powered. Max voltage swing, max cap current. I agree with you, even if I don't know where this formula come from. Check Page 9 htt...
by Lagoethe
Dec 07 2011 2:12pm
Forum: Motor Technology
Topic: Calculating controller power input capacitance
Replies: 105
Views: 17276

Re: Calculating controller power input capacitance

First I attached 2 docs they are .asc file (LTspice) so remove the .pdf to launch them. You might need the .lib or I don't know what of the mosfet I used (IRFP4468). So, find a way to make it work (I have absolutely no idea how, still not familiar to LTSpice sorry) or use another Fet or use a switch...
by Lagoethe
Dec 07 2011 6:49am
Forum: Motor Technology
Topic: Calculating controller power input capacitance
Replies: 105
Views: 17276

Re: Calculating controller power input capacitance

I would suggest the following very crude estimate of ripple current for specifying the caps. Iripple = Imax*(tr+tf)/T Sorry but I can't understand where this formula come from Anyway I did models with LTSpice. I find HUGE ripple current in input capacitor. Approximatively (in RMS) 2/3 of battery cu...
by Lagoethe
Nov 29 2011 2:56am
Forum: Motor Technology
Topic: Calculating controller power input capacitance
Replies: 105
Views: 17276

Re: Calculating controller power input capacitance

It's difficult enough to make an accurate calculation of the input ripple current that it's not even worth trying. It would require a complex model, which depends on a lot of quantities that are themselves very difficult to accurately calculate, such as all the parasitic components, switching chara...
by Lagoethe
Nov 28 2011 6:41am
Forum: Motor Technology
Topic: Calculating controller power input capacitance
Replies: 105
Views: 17276

Re: Calculating controller power input capacitance

just trying to bring a potential fly in the vaseline to your attention Ok then. I think we agree. Just use more capacitors than you calculate that you need. The idea of doing the math is mainly to: -understand the key points -"sizing" the build. Of course there'll be some iterations after...
by Lagoethe
Nov 27 2011 5:02am
Forum: Motor Technology
Topic: Calculating controller power input capacitance
Replies: 105
Views: 17276

Re: Calculating controller power input capacitance

I apologize but I still don't understand why you want to measure the ESR. Also As I wrote before (and discovered by reading the application notes of electrolytic capacitors) ESR varies (is modified) by the applied load. The ESR won't be the same at a switching frequency of 120Hz and 100KHz. The ESR ...
by Lagoethe
Nov 26 2011 11:05am
Forum: Motor Technology
Topic: Calculating controller power input capacitance
Replies: 105
Views: 17276

Re: Calculating controller power input capacitance

Is there a way to mesure ESR? What do you mean by measuring ESR ? ESR we talk about is for Input Capacitors. It's provided by supplier. You can make the maths to find it at a specific load. I don't really understand the use of measuring it in fact. But if you think of the resistance and inductance ...
by Lagoethe
Nov 25 2011 4:09am
Forum: Motor Technology
Topic: Calculating controller power input capacitance
Replies: 105
Views: 17276

Re: Calculating controller power input capacitance

1-Ripple current I think brushed motors works exactly like buck converters then I used a source I found Calculating ripple current for your case: http://www.edn.com/article/470432-Reducing_buck_converter_input_capacitance_through_multi_phasing_and_clock_synchronization.php D is duty = > worst case =...
by Lagoethe
Nov 24 2011 5:15am
Forum: Motor Technology
Topic: Calculating controller power input capacitance
Replies: 105
Views: 17276

Re: Calculating controller power input capacitance

1) Check the resonating frequency of your cable inductance with the capacitor (read above) and adjust your cap value so that the resonating frequency is way below your PWM frequency. I'll do it 2) You can make a bigger ripple current by putting several caps in parallel, which will also reduce ESR a...
by Lagoethe
Nov 23 2011 4:46am
Forum: Motor Technology
Topic: Calculating controller power input capacitance
Replies: 105
Views: 17276

Re: Calculating controller power input capacitance

I'll try to give some ideas through my recent web surfing A- Ripple current of Input Capacitor For a 3 Phases Inverter, Sinusoidal Vline = sqrt(3/2) x 1/2 x Vbatt Assuming efficiency and power factor = 1 ( avoid many terms) Power = sqrt (3) x Vline x Iline Iline = Power/( sqrt (3) x Vline) = Power/(...