Search found 3117 matches

by Lebowski
Jun 20 2018 6:21am
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 164
Views: 10128

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

a non-EV related picture... not bad for a 750cc ICE (75 mpg in US units)
nc750xd.png
nc750xd.png (391.85 KiB) Viewed 695 times
by Lebowski
Jun 19 2018 12:21pm
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 164
Views: 10128

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

Watch out, the power rating values are only correct for the 100 Ohm example... with 50mA and the voltage you want to drop you can calculate the required rating. 40V and 50mA means you dissipate 2W, the resistor you use should be able to take this . When using 100 Ohm 0.5 W resistors for instance, yo...
by Lebowski
Jun 19 2018 9:29am
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 164
Views: 10128

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

Important remarks: R1: According to lebowskis video one page back this resistor ("tbd") should reduce the battery voltage to around 40 V at ~15 mA. A voltage drop of from 80 to 40V would mean a resistor value of 2.7 kOhm. Value in the kit: 220 Ohm (just a 3V reduction). Is this ok? R2: I think this...
by Lebowski
Jun 15 2018 1:50pm
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1713
Views: 172401

Re: Lebowski's motor controller IC, schematic & setup, new v2.A1

Its a 5V chip (a 33EV from microchip), but for now it is all very early stages. Main thing to see is how it holds up under high throttle...

I have some opamp circuits, mainly to help the ADCs...
by Lebowski
Jun 13 2018 1:39am
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1713
Views: 172401

Re: Lebowski's motor controller IC, schematic & setup, new v2.A1

No chance... the hardware is just not there
by Lebowski
Jun 12 2018 10:41am
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1713
Views: 172401

Re: Lebowski's motor controller IC, schematic & setup, new v2.A1

:D my idea for getting full 360 info has worked, now I get reliable info about whether the phase is 0-179 or 180-359. So all combined I now get full 360 degree info (smooth, not just 6 levels) about the rotor position, sensorless at standstill. Processing time is around 10 to 20 msec for the first r...
by Lebowski
Jun 08 2018 2:53pm
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1713
Views: 172401

Re: Lebowski's motor controller IC, schematic & setup, new v2.A1

Just spent 2 days programming, but ran into a problem with the 33EV I'm using... some obscure mistake in the silicon explained in the errata (but who reads those ?). Luckely there's other ways to skin a cat...
by Lebowski
Jun 05 2018 4:59am
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 164
Views: 10128

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

I have only a 50W iron, it just takes some time to heat everything up. Main thing to look out for is that the stuff on the opposite side of the board does not de-solder during this long heating time, so I had my L shaped heatsink there to keep things cool (clamped on with some clothes pins)
by Lebowski
Jun 05 2018 1:51am
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1713
Views: 172401

Re: Lebowski's motor controller IC, schematic & setup, new v2.A1

Is this the method where they measure inductance using the rise time of the current ? Don't you get only a 1 out of 6 info from this (so only 60 degrees resolution) ?
by Lebowski
Jun 04 2018 3:14pm
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1713
Views: 172401

Re: Lebowski's motor controller IC, schematic & setup, new v2.A1

INFORM method ? I dont follow the literature and like to do everything myself, is more fun... at high speed I will switch over to backemf based sensorless of course.
by Lebowski
Jun 04 2018 2:19pm
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1713
Views: 172401

Re: Lebowski's motor controller IC, schematic & setup, new v2.A1

I think the deatime is too short (set for 500nsec) to get anything useful out... plus there is phase current flowing to make the motor turn, effectively forcing what happens during deadtime... Putting a pattern on the I_imag was like the neutral light on my old Moto Guzzi, it was right about 80% of ...
by Lebowski
Jun 04 2018 11:38am
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1713
Views: 172401

Re: Lebowski's motor controller IC, schematic & setup, new v2.A1

Been very busy here with the saliency (?) based position detection, want to detect the rotor phase at standstill by measuring the differences between the motor inductances. And I want it good, just dividing the rotor position in 60 degree portions (like what you get with hall sensors) will not be go...
by Lebowski
Jun 03 2018 4:32am
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 164
Views: 10128

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

Dont forget to electrically isolate the FETs from the heatsink (by means of little heat pads) ! Also make sure you have the high and low ohmic resistors connected to the battery input at the correct place. The high value goes in the battery measurement line(via the 100nF), the low value in the power...
by Lebowski
Jun 01 2018 10:15am
Forum: Motor Technology
Topic: FOC identification
Replies: 10
Views: 366

Re: FOC identification

So this is from my controller:
DSC02113-800x800.jpg
raw output signal
DSC02113-800x800.jpg (139.88 KiB) Viewed 285 times
DSC02115-800x800.jpg
low pass filtered (here done with RC, normally done by motor inductance)
DSC02115-800x800.jpg (74.29 KiB) Viewed 285 times
DSC02116-800x800.jpg
blue is the difference between yellow and magenta, a sine wave.
DSC02116-800x800.jpg (77.08 KiB) Viewed 285 times
by Lebowski
May 31 2018 3:16pm
Forum: Motor Technology
Topic: FOC identification
Replies: 10
Views: 366

Re: FOC identification

Its the typical moving midpoint sinusoidal output... this does not mean its foc just that it is sinus out. The clou is that each if the waves looks kind of trapezoidal, but the DIFFERENCE between two voltages is sinusoidal (and with a max amplitude larger than what fits in the supply, which is the r...
by Lebowski
May 23 2018 6:08am
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1713
Views: 172401

Re: Lebowski's motor controller IC, schematic & setup, new v2.A1

Hm I don't know, 120kHz bandwitdth for the ACS parts seem good enough to me. 100k-erpm translates to 1.6 kHz, a pole at 120kHz would give a phase rotation of less than 1 degree. Cycle time of the algorithm is in the order of 30usec, so 4 usec delay in the current sensor doesn't seem relevant.
by Lebowski
May 18 2018 2:56pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Suzuki GSX-R e899 K2
Replies: 293
Views: 27019

Re: Suzuki GSX-R e899 K2

I would do 70% of max controller phase current. If it is a good controller it will probably not hit that level but back off earlier for other reasons...

But no reason not to start low and try anfew runs upping the field weakening, just dont expect impressive results before hitting the 70% mark.
by Lebowski
May 18 2018 9:00am
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1713
Views: 172401

Re: Lebowski's motor controller IC, schematic & setup, new v2.A1

I prefer proper current (magnetic field based) over resistive ones for the simple reason that if you want to keep the power dissipation the same, the higher the current rating of the resistor the lower the effective voltage you'll get. A 1W sense resistor for 1A can deliver 1V signal, a 1W for 1000A...
by Lebowski
May 17 2018 7:24am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Suzuki GSX-R e899 K2
Replies: 293
Views: 27019

Re: Suzuki GSX-R e899 K2

If you can set fieldweakening current, set it to 70% of max phase current.
by Lebowski
May 16 2018 1:32pm
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1713
Views: 172401

Re: Lebowski's motor controller IC, schematic & setup, new v2.A1

Phase inductance should be different depending on rotor position. If that's enough info, and "easily" measurable, to know the exact rotor position, it's another story. Maybe it's also possible to use a phase to induce current into another phase and from that get position information. I imagine the ...
by Lebowski
May 15 2018 11:14am
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1713
Views: 172401

Re: Lebowski's motor controller IC, schematic & setup, new v2.A1

My goal is to have something which can sense the correct phase even when the motor is (mechanically) locked, so that the motor can provide torque in the correct direction against the mechanical lock. So no cheating by having a necessary small bit of movement to try and figure out which way we're goi...
by Lebowski
May 15 2018 2:30am
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1713
Views: 172401

Re: Lebowski's motor controller IC, schematic & setup, new v2.A1

lizardmech wrote:
May 14 2018 5:11am
are you keep it secret in the hope of commercializing it or something?
yes :D
by Lebowski
May 14 2018 2:55am
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 164
Views: 10128

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

basically the circuit is a lowpass filter. With the VESC it allows you to filter out the PWM and see the sinusoidal content of the output.... though it should look more trapezoidal than sinusoidal. You need the motor parameters to calculate the correct timing advance for FOC. But mine does not need ...
by Lebowski
May 14 2018 2:52am
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1713
Views: 172401

Re: Lebowski's motor controller IC, schematic & setup, new v2.A1

Filtering and amplification... basically compensating for the ADC being only 10 bits