ES 1.0 Graveyard

Hi All,

Been away for a while. I'm wondering if the lebowski controller is still available to be purchased. All I require is the control board/uC as I want to make my own power stage.

Thanks

Yes definitely in the P3 there will be a dedicate heat sink. however I think the P@ can still take a fair amount of current with the power plans as makeshift heat sinks.

So here is Prototype 2 (P2). She is working :) It is a 4 layer board whose FET layout is inspired by Vedder. Got total isolation from the logic side to the power side. This includes isolated current sensing as I am using Hall effect current sensing. Was my first time soldering QFN packages so I did ...

Buk___ wrote: ↑

Feb 23 2018 1:32pm

12 magnets, 6 pole pairs, 18 teeth.

So the pole pairs is the number of magnets/2?

Hi,

So I am trying to find out how many pole pairs this motor has

Bro I feel your pain its infuriating with this stuff. Quick tip if you want to probe the balance leads just grab a single strand wire used for hobby electronics and shove it in the jst connector for easy probing. From what I can gather from scrubbing lightly through your ordeal, it seems that your b...

johnrobholmes wrote: ↑

Jan 05 2018 8:08am

Looks like a cool project. Hook some motor up and see how stable to gates are.

I already hooked a motor to it and it works well! Now I just need to construct the new smaller board and see how it works.

You should also be aware that faster switching (short rise and fall times) will produce larger overshoot. In typical ebike controller switching losses are small portion of conduction losses since switching frequency is low. You use very fast gate driver and low 10ohm gate resistor. check this schem...

So correct me if I'm wrong but in sensorless control using space vector modulation you measure the current to know the rotor's position and hence you can know how to drive it As I underetand At low rpm the problem is the current is small and hence you cannot measure it properly. To solve this issue,...

Looks great. One thing I've noticed before when trying those kind of measurements is you often get 'artifact' from the probe leads, especially if the ground wire is too long. The other thing will be to make the same measurement with an actual motor load. Motor inductance is a big factor. Yes defini...

2.Could I get away with placing just 3 ceramic caps across each half bridge as I just have big fat electrolytics across the POWER rail which are useless for this kind of thing.?[/color] I'm not a real expert on this stuff, but I have reverse engineered a lot of controllers. I would try placing some...

2.Could I get away with placing just 3 ceramic caps across each half bridge as I just have big fat electrolytics across the POWER rail which are useless for this kind of thing.?[/color] I'm not a real expert on this stuff, but I have reverse engineered a lot of controllers. I would try placing some...

Hi all, I am doing my final year thesis in electronics and control. I have built a prototype board for my BLDC motor controller. The board has a lot of test points and jumpers so I can manipulate components in and out of circuit to see what effect they have on the wave forms. What I want to test for...

So as expected, I need a snubber for the high side and a snubner for the low sode correct? I think you would do well with snubbers between the bridge outputs and ground, this seems to be the most common arrangement. I can't find much information about snubbers across each switch in a bridge. Take a...

1) You're right about the size of the ca0s. In the example give and others I've looked up the sizes are small so it is not a problem. 2) So after determining the parasitic cpaacitance and inductance, I can stimulate the circuit with those values and determine the power rating required. 3) So as expe...

Hi All I am desgigning my own 3 phase motor controller. I want to implement a snubber circuit to Protect the FETs. I will use and RC snubber circuit since it is simple and effective, even though it has quite low efficiency (approx 40%-60%). I have found this application note which is great and guide...

So its been a long time so here are some updates: I have successfully made a circuit using the IR2184 Driver using the bootstrap driving mode. The circuit works flawlessly however I have limited the PWM from a range of 10% - 90% to allow the capacitor time to charge. My mentor however suggested that...

Why not join the "LegStrong - Open-Source HW/SW controller (FOC + Bluetooth)" instead of doing again another project?? If you prefer a 6 steps or sinewave, you have the cheap controllers from Kunteng that I am developing firmware for. We already have the schematic and OpenSource firmware....

The third year is over. I have finalized my first prototype of the MOSFET gate driver board as seen below. 1.PNG 2.PNG In the top layer there are IR2308 MOSFET drivers which have integrated dead time to avoid MOSFET shoot-through. I will be using a 30 kHz switching frequency. Therefore I will use a ...

https://endless-sphere.com/forums/viewtopic.php?f=2&t=88285 I just have open the design files in circuit maker. Be careful with those ACS, they are really good for efficiency (no use of shunt) but they are really, really noise, specially close to switching devices (since it affects the magnetic...

https://endless-sphere.com/forums/viewtopic.php?f=2&t=88285 I just have open the design files in circuit maker. Be careful with those ACS, they are really good for efficiency (no use of shunt) but they are really, really noise, specially close to switching devices (since it affects the magnetic...

@casainho: That's a very neat way of doing things but when you are applying the PWM to the input pin of the driver, when the PWM is in the low level state won't the lowside Mosfet switch on? I don't really know the details - please look to the datasheet of the IC. I drive with PWM the pin IN and en...

Hi Glenn, In my project I decided to go with the TI DRV8301, it has the three mosfet drivers for up 60V, two amp/ops for current sense, a good buck converter and SPI communication for faults and some configs. But the way you want is actually the way to go, it can be cheaper and you can easily adapt...

@casainho: That's a very neat way of doing things but when you are applying the PWM to the input pin of the driver, when the PWM is in the low level state won't the lowside Mosfet switch on?

Well, the board I am using also uses that kind of ice and I really like because is a cheap e easy to repair and understand the technology. Please give a look at the simplified schematic of my board and the components used: https://eggelectricunicycle.bitbucket.io/MicroWorks_30B4_board.html This boa...