Re: OT Elektrokoloběžky - odbuzení motoru

[Aleš Filip]

Dobrý den,

V návodu k programu je toto:

*Speed Boost*

*This is highly experimental!*
*Use with caution and at your own risk! *
*Only use this option if you know what you are doing!*
*This option if used incorrectly can harm and destroy your motor!*
*Your motor could easily overheat if you choose too much current!!*
*Speedboost can lead to high battery consumption!*

*Google 'Field Weakening Control' to get more information on this 
technique!*

*Vmin when activated*
Select the speed at which speed boost gets activated by applying *Imin 
current.*

*Imin - initial current applied*
Initial current applied once *Vmin*is reached

*Imult multiplier*
Indicates additional current used for each additional km/h

Applied current = *Imin*+ (currentSpeed- *Vmin*)**Imult*/4096

*Example:*
Imin=7
Vmin=30km/h
currentSpeed=36km/h
Imult=4096

7+((36-30)*(4096/4096) = 7+(6*1) = 13

This boost is a speed/torque trade-off when operating over 
base-speed(top speed without field weakening). It is easy to reach crazy 
freewheeling speeds with higher currents
which won't be reached under real load. Therefore weakening the magnetic 
field while driving uphill will likey just lower your torque and reduce 
efficiency. Downhill or on flat ground the effect is most effective.
Using field weakening makes only sense in cases the max. motor torque is 
not needed.
This is mostly the case on *flat streets*ot driving down a hill.

If you want to experiment, start with *Imin=2, Vmin=25km/h , Imult=0 
(current does not increase with speed)*and increase the values slowly. 
Per an value increase of 3 you should get about 1-2 km/h of additional 
speed.
*Vmin*should be set *close*to your *default top speed*or a little lower 
like *5-8km/h*(so with decreasing battery voltage you still reach this 
limit for activation) as field weakening makes only sense when driving 
almost at your usual top speed(base-speed). If default top speed is 
*30km*/h set it to 25-22km/h, if default top speed is *36km*/h set it to 
31-29km/h

Think of the speedboost settings as scalars, a value that gets used to 
modify the amount of current that gets applied to overcome/reduce the 
back EMF that is limiting the max. rotation speed.
Basically it scales the field vector opposing the back EMF.
This value it's not directly translatable to amps or a specific power 
draw from the battery!
So summing *Pmax*value and the speedboost *scaling factor*is *not*possible.

It's more like: the higher the value the more current will get used for 
field weakening.
But as increasing this value leads to increased power draw it's 
intuitive to think of it as scalar that scales the applied current used 
for field weakening the back EMF.
The idea of the speedboost settings are to be able to scale the applied 
field vector.

This option is much more effective on the *G30*motor than on m365 motor.
On G30 people with fully charged stock battery reach up to :
*36km*/h on *V6*motor (motor serial number starts with 6) and
*42km*/h on *V9*motor (motor serial number starts with 9)
on a flat street.

*Active for*
Select the driving modes for which speed boost should be activated



S pozdravem,

-- 
  Aleš Filip
  Kutná Hora
  http://xanadu.khnet.info

Dne 11.08.2022 v 14:02 Jaroslav Lukeš napsal(a):
> BLDC motor se neodbuzuje, je to 3 fáz synchronní. Jedině že zkrátí 
> nějakou mrtvou dobu, že je vinutí napájené déle. Je to prostě spínání 
> cívky.
>
> Aleš Filip napsal(a):
>>
>> Dobrý den,
>>
>> Když už jsme u těch koloběžek. Koloběžka s 36V napájením a 350W 
>> motorem se nerozjede na víc, než 33km/h, s klesajícím napětím baterie 
>> tato rychlost klesá.
>> V programu na úpravu parametrů je volba SpeedBoost. Ta, když se 
>> zapne, tak umí "odbuzovat motor", a tím se ještě o něco zvýší ta 
>> maximální rychlost. Autor ale nedoporučuje to používat, že by mohlo 
>> dojít k poškození řídící jednotky - vybouchají FETy.
>> Co je to odbuzení motoru?
>> Dá se nastavit, při jaké rychlosti to má začít odbuzovat, proud Imin 
>> a Imult multiplier x/4096.
>
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