Search found 51 matches

by tecnologic
Apr 30 2019 1:08pm
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 377
Views: 58531

Re: VESC-controller: Axiom hardware released!

@peters: this is ok when the initial value of the integrator is flux_linkage/L. This term is just a offset and as ti explains in the it is 0 for the derivative of id. It's just the start value problem of the integrator, we are arguing about. Because of this I see no influence on the model at all jus...
by tecnologic
Apr 30 2019 10:39am
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 377
Views: 58531

Re: VESC-controller: Axiom hardware released!

Hi Maxi, this term is normally neglected because it's only a integrator starting value. What makes me curious why this affects mtpa. I can assume that at the first startup may have a inaccurate simulation but u always start at id=0 and by that the id_int value needs to be flux_linkage/Lds. And no mt...
by tecnologic
Apr 27 2019 12:44pm
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 377
Views: 58531

Re: VESC-controller: Axiom hardware released!

marcos wrote: ↑
Apr 26 2019 7:29pm

We should have some cool news next week, and Tec, we found an issue with your motor model, PR with the fix coming soon.
Whoot :shock: ok I'm eager to know whats wrong.
by tecnologic
Apr 08 2019 12:13am
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 377
Views: 58531

Re: VESC-controller: Firmware released!

marcos wrote: ↑
Apr 06 2019 9:57am

Big thanks to tecnologic:
https://github.com/vedderb/bldc/pull/82

With this signal injection we can now make the microcontroller think it is running a PM motor. Will lay the groundwork for algorithm development and deeper automated testing.
u are welcome :)
by tecnologic
Feb 21 2019 3:18am
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 377
Views: 58531

Re: VESC-controller: Firmware released!

Thanks! Looks very good, will try it out today. :bigthumb: My goal: drive a 3 phase motor with PWM / FOC, but I require only a few amps - but in exchange with very high frequency (20kHz - 4 MHz, the higher the better) and very high voltage spikes (10kV - 100kV the higher the better). What do u want...
by tecnologic
Feb 20 2019 4:05am
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 377
Views: 58531

Re: VESC-controller: Firmware released!

Hi Marcos,

Have a look here :)
http://cpp.sh/33vcz


In case of questions just ask. Maybe in a seperate Thread?
by tecnologic
Jan 31 2019 6:42am
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 377
Views: 58531

Re: VESC-controller: Firmware released!

marcos wrote: ↑
Jan 30 2019 11:23pm
If this actually works I'll need help from someone with motor modelling skills.
When u are there give me a ping I can supply u with the equations in c/c++ code.
by tecnologic
Jan 16 2019 2:24am
Forum: Motor Technology
Topic: Esc current sensing
Replies: 18
Views: 785

Re: Esc current sensing

The delay is weird, the peripherals in this thing are just a combination of other c2000s.
by tecnologic
Jan 15 2019 11:59am
Forum: Motor Technology
Topic: Esc current sensing
Replies: 18
Views: 785

Re: Esc current sensing

They still haven't released the instaspin software for the 280049. It was supposed to be out q2 or q3 2018 now it's q2 2019. :roll: The 280049 does look pretty good though. ok, but they are a great design for motor control especially in this price point. The F28379S/Ds are to expensive and no one r...
by tecnologic
Jan 15 2019 1:17am
Forum: Motor Technology
Topic: Esc current sensing
Replies: 18
Views: 785

Re: Esc current sensing

if u are going to use a Tms320f28027f, why not going the extra mile and use a TMS320F280049 with instaspin, as i assume, u want to use by the phase voltage sensing? The 0049 would give u sigma delta decimation filters so that u could use AMC1304s as a ADC with +-50mV input combined with a 0.1mR Resi...
by tecnologic
Jan 14 2019 2:10am
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 377
Views: 58531

Re: VESC-controller

I hear you there, its not easy to find embedded firmware developers that work comfortably with power electronics. Until recently I would have rejected a job like that because I wasn't confident enough with the codebase. You need proper instruments to peek inside this kind of non-debuggable code, an...
by tecnologic
Jan 04 2019 4:46am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 5616

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

Does any body know the base speed and Max speed of a leaf or Prius? How what ratios of base to top speed are IPM driven cars use? I would assume most of them have higher voltage parts as needed for base speed. Does any body know the voltage rating of the leaf inverter?
by tecnologic
Jan 04 2019 4:39am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 5616

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

@maddin: regarding the 30% id. This is just a rule of thumb from other IPMs i have handled so far. This lead to around 17Β° of current advance which is quite near to the MTPA operating point at high load. It's not ideal but a current 30/70 should give us more torque that 0/100 in an IPM like that. Ha...
by tecnologic
Jan 02 2019 3:53am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 5616

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

My take on switched reluctance and how it produces a voltage: (bear with me if there are any mistakes, it was new year eve after all :? ) slide_1-800x800.jpg slide_2-800x800.jpg slide_3-800x800.jpg Mmh. All equations I know but the switched reluctance distracted meπŸ˜€. And I am still not sure what yo...
by tecnologic
Jan 02 2019 3:50am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 5616

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

Can we say that if the flux path between the magnets is poor, the potential for relutance torque is also poor? And lets assume we have a given motor and an induction meter, can we "measure" it's potential for reluctance torque, or the general potential for field weakening? Is it just always the dif...
by tecnologic
Dec 31 2018 5:53pm
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 5616

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

Switched reluctance motors work totally different than sync machines, you could compare it with a SynRM but not switched reluctance. For me this is unclear because reluctance will never produce a voltage it's always the current and that is set by yourself so it's no measure for an optimal operating ...
by tecnologic
Dec 31 2018 3:29pm
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 5616

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

Lebowski, not sure if i get u right, but if u mean that u align ur current with the "bemf" formed out of the magnetic inducted voltage and the inducted voltage by the current flowing then u would handle IPMs and SPMs not in the optimal operation point. I know ur implementation is not like industry d...
by tecnologic
Dec 31 2018 10:28am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 5616

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

Ok. But i wanted to clarify: the phase of the voltages is of no importance its about the negative d current which produced a magnetic field in oposite direction of the magnets field and there for lowering the over Flux densety in the air gap which lowers the BEMF voltage.
by tecnologic
Dec 31 2018 9:47am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 5616

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 tecnologic
Dec 31 2018 8:52am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 5616

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

U are right maddin, but this is due to false FW handling by those controllers. For rpm/Kv > V battery id must always be != 0. regardless of torque command. Every industry frequency converter i know is handling it like this.
by tecnologic
Dec 31 2018 6:37am
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 5616

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

The flux path i was discussing there was the one from the V grove rotor not the qs3000w u posted up front. For the qs3000w u are right there is not much reluctance torque possible, it will only come by the magnets saturating the stator iron (5-10% max). The pictured rotor with the V-groove magnets ...
by tecnologic
Dec 30 2018 5:36pm
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 5616

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

For IPMs and SPMs its the same id <0 lowers the Kv so reduces magnetic torque. But reluctance torque is added for IPMs. Have a look at the curves in the ti talk emoto linked to the thread. At 17min there is a slide with the torque curves over current angle.
by tecnologic
Dec 30 2018 4:50pm
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 5616

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

Ok lets claryfy, the general field weakening is used when the supply voltage is insufficent to reach the current command. What is special about IPMs is the additional reluctance Torque component. To utilize this torque component to reach max motor efficiency u need to run a d current lower than zero...
by tecnologic
Dec 30 2018 12:23pm
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 5616

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

Have you guys seen my thread on fieldweakening ? That it has nothing to do with weakening fields ? That you can do 'field weakening' with inductors EXTERNAL to the motor, so where they dont impact the field in the motor ? (typing on a tablet, copying link is difficult). And what do you need a table...
by tecnologic
Dec 30 2018 12:22pm
Forum: Motor Technology
Topic: SPM VS IPM Motor - And Field weaken, is it worth it
Replies: 85
Views: 5616

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

I Think he is generalizing , as i am, the only twist here is comparing spm 68kv non fluxed to ipm 41kv ipm fluxed . at same speed. First you need to find a controller which can apply field weaken current already at 0 RPM, and second thing is you should have enough room left for BEMF to climb. Becau...