RC India

I have bldc motor , esc, and servo controller and propeller but i don't have lipo battery.
Please tell me how to run bldc motor without lipo.

There are two ways:

1) Buy a lipo battery pack, and test it ;D

2) Buy a suitable power supply that is able to supply the current required. Honestly, this is a costlier option in the long run.

Lipo battery will take upto 20-30 days to be delivered and i am waiting for ordered lipo battery to reach destination.

I have 30amps esc and A2212 1000kv motor. which configuration of power supply i should have to buy for this...

You don't really need a lipo. You can connect any power supply to ESC given that the power supply can deliver the required output.

use car battery

Use a 12V ~40A power supply.
It's no way a logical option in the long run; unless you want a wired copter.

I personally use such supplies because I require them. It's easier for me to buy one power supply rather than 10 battery packs, which are limited by the life cycles.

I was also thinking about this in the past. Had tried using LM2596 voltage convertor with a 12v dc adapter https://www.amazon.in/Adraxx-LM2596-Converter-1-5-35V-Adjustable/dp/B01N23Z1JO?tag=googinhydr18418-21&tag=googinkenshoo-21&ascsubtag=a577bc11-b224-4259-88c2-fbc7beaed5f4
Problem is it’s max amp is 3A. So if you try to give sudden throttle, ESC will get restarted. If you try to give a low throttle and gradual increase, at some point ESC will cut off again.

@ taksh
Best to wait for your Lipos to arrive.
The expenses involved in getting a wired equipment capable of supplying the amperage for the brushless motor will be too much as they will be purchased only for running the motor. You can purchase them if you have another use for them. Maybe use the supply for your lipo charger or Something?
A 12v 40amp supply will set you back about 2.5k
You can get 1-2 cheap lipos from Indian sellers for that price.
Why not borrow a lipo from a friend nearby? I remember you saying that people did fly out there.....
Regards

I don't  have friend in my area and people in area doesn't have lipo battery and drone.
Only possibility is of small eachine drones.

You are right i need to wait for my lipo to come.
I purchased one module from AliExpress and i found that module is not working. I used module after 10 days when i received product.Chinese seller is bad seller. I just save my few bucks for cheap module and cheap module is not working that is why i want to test my motor as well as esc.

yeh people is flying plane but distance is of 16km and time of flying plane is 5 am so i can't go to that place and parents will not allow me to go to place at 5 am which is 16km away from my location.

Thanks

I have this module LM2596 but i don't have Ac to DC converter. Is there is any other way to get ac-dc convert or dc voltage.

LM2596 can't work at more than 3 amps.
You need a 20 amp supply.
Either you find such a power supply (AC to DC) which will cost you some money. Or you get a cheap used lipo from someone on rcindia.
What else can be done?

I expect that you have a battery charger. Then most probably you might even have a DC adapter with it which you can use for this purpose.
Since you only want to test the ESC and motor even though the power supply rating is low you can still test it but don't push too hard. Increase the throttle slowly.

Thanks for Suggestion.
I have module with 3 feature.
LM2577S LM2596S DC-DC Step Up Step down module.

Arduino power adapter is providing more than 9V and more than 1 amps and works as AC to DC adapter.
Problem is of now load and choosing perfect wire which can handle more voltage and more amps.

Lipo is not cheap as  it costs more than 1k and below 2k. Lipo will take upto 5-15 days to reach destination and courier  will be DTDC by rcmumbai which costs Rs.350.

I am planning to visit chandani chowk market and will purchase transmitter. Is there is any shop where i can get good lipo then please tell me ...

Thanks.

@taksh

My honest suggestion would be to wait for the lipo.

1A is not at all a suggestible current output at which you can run a ~300W motor. Even if it was around 3-5A @ 12V, you could've used it as Bala had mentioned. But 1A is just not enough current.

LM2577S LM2596S DC-DC Step Up step down module will increase the current. First i will check the current and voltage output from module. If current will be more than 3A and voltage will be 12v then i will make system to test bldc motor.
I hope that this module will give more than 3A.

Thanks.

I don't follow up what you're trying to say.

Stepping up the voltage is possible, and so is stepping down. From the conservation of energy, when stepping down, current supply is increased at that particular voltage.
And that's how you get a higher current output but at the cost of a lower voltage.

But you can't increase both at the same time.

@ taksh
Not possible

After talking to you on phone, I think about module. Capacitor can be explode due to high temperature.
Using module, i think it is not possible to run bldc motor.

@taksh
Step up converter increases voltage and decreases the current.

@taksh
P=VI and V=IR
10th std physics.
Simple
As I explained on the phone.

@taksh
Can you not borrow a motorbike 12v battery?
Regards

@kiran sorry to disturb the flow of the topic but they VOLTAGE and CURRENT are DIRECTLY PROPORTIONAL, at least in most of the cases ;D

V=IR

But what Kiran was trying to say is,  in the case of a step up/down converter, the power remains same(Input Power= Output Power)(in an ideal scenario) so, if either one of them increases, the other one is bound to decrease.

Yeah, you can buy/borrow a 12v lead-acid battery pack. They might not deliver the full required current but you may test them.

BTW, never try to run the motor on your arduino/FC , especially when it's connected to your PC.
I once foolishly tried it and had my motherboard replaced.

Come now, Aravind.
If they can power the car/bike starter motor turning against the engine compression, surely they can power taksh’s motors.
(If I remember correctly, in 1986, when I restored a 1955 Fiat Millicento, the starter motor used to draw 75amps)

You can either take lesser number (voltage) of long steps (current) or faster number of short steps. it will not change the total energy burnt (Watt). V and I compensate for each other. For Switched Supplies like the 2596, all the more pronounced. ask it to deliver more current than expected and you will be left with toasted FETs and chips.

Why do you want to run a motor without a lipo my friend? If the intention is to test the setup, use a car battery/bike battery/ups battery/inverter battery. run it on "no load" if you want to test and you can run it off a 2-5A power adapter. Be prepared to ruin the adapter if you plan to run it with the propeller on. for flying, simply wait for the lipo.

hope that helps.

PS: most SMPS supplies emit a high pitched sound when nearing the edge. that is a good indication you are rubbing it too hard.

The car battery yes it does have enough juice (~135Ah) to make that motor go on for a long time. conversely one can successfully start a car with a lipo, havent tried but will do to TOFT.  :thumbsup:

@Aravind
  
My bad! Thanks for the correction.


P. S  a lot of suggestions added for car/bike batteries, but the continuous discharge rate seems low. Any views upon this?

@KK

I'm not well versed with lead acid batteries ;D Shouldn't have said that.
Just good with lithium based ones.