low power electronics

[moustafamagdy]

i need custom motors and electronics that work at very high voltages 400+. Custom low watt electronics for this heli http://www.angelfire.com/blues/heli_project/index.html ...and low power to which extent ?? and are these electronics avaiable in market ? ...

[moustafamagdy]

38 views, no replies <<== that's great

[AndyOne]

moustafamagdy

It helps if you don't write in a demanding style, this sets you off on the wrong foot to start with and is unlikely to get people on your side with this project.

You also don't define your requirements for "electronics" what electronics and why 400V, that seems unnecessary and how low Watt and to power which part of the heli?

Try asking the question in a way that leads to possible answers.

Andy.

[moustafamagdy]

Ok Andy,

http://www.angelfire.com/blues/heli_project/index.html
this heli in the above link is considered a 300-350 size heli which draw probably 16 amps. if the cells are 11.1v,therefore 11.1*20 = 222 W ...
So i want to decrease the watt for certain application, so since the motor is the biggest draw ,it will pull about 11A. i need to make it draw as least as possible for abt 5-6A...can i do this??

[moustafamagdy]

srry i mean 11.1*16= 177.6 W

[slipstick]

180W @ 5A = 36V. If you want to decrease the power (watts) the voltage will be even lower. A different motor, controller etc would be needed but it may be possible.

So where does the 400V+ in your original question come in ?

Steve

[Almaz]

Ok Andy,

http://www.angelfire.com/blues/heli_project/index.html
this heli in the above link is considered a 300-350 size heli which draw probably 16 amps. if the cells are 11.1v,therefore 11.1*20 = 222 W ...
So i want to decrease the watt for certain application, so since the motor is the biggest draw ,it will pull about 11A. i need to make it draw as least as possible for abt 5-6A...can i do this??

CP helicopter in the picture consumes 4-6amps. It is already 40-60 watts.

[Capt. Crunch]

We use low voltages in the Hobby industry because if you use > 52Volts it can shock and posibly KILL you!

400V is almost always leathal if if it goes across your heart, and you can't "Turn" it off at the source.

"are these electronics avaiable in market ? ..." Yes, but very specialized industrial uses, I personaly in 20+ years in electronics have never used that high a voltage. Electronics in general are going to very, very low voltages rather than higher voltages.

Certain outer space applications use high volts for power generation and distribution, you might try looking there for more info.

Crunch

[moustafamagdy]

So where does the 400V+ in your original question come in ? <== yeah i needed low current as my first concern but if i can decrease the whole power by more efficient electronics it will be better..

180W @ 5A = 36V. If you want to decrease the power (watts) the voltage will be even lower. A different motor, controller etc would be needed but it may be possible. <<== u mean voltage will be higher right ? what certain brushless motor and controller can make this ?

[moustafamagdy]

CP helicopter in the picture consumes 4-6amps. It is already 40-60 watts. <<=== who told u !!! it uses a 700mah 15C sayno battery 11.1V = > 700*15=10500/1000 = 10.5 A * 11.1 = 116.55 W

[moustafamagdy]

We use low voltages in the Hobby industry because if you use > 52Volts it can shock and posibly KILL you!

400V is almost always leathal if if it goes across your heart, and you can't "Turn" it off at the source.

"are these electronics avaiable in market ? ..." Yes, but very specialized industrial uses, I personaly in 20+ years in electronics have never used that high a voltage. Electronics in general are going to very, very low voltages rather than higher voltages.

Certain outer space applications use high volts for power generation and distribution, you might try looking there for more info.

Crunch

u mean lethal ??
ok low power ? low current ? anything :P

[grnbrg]

CP helicopter in the picture consumes 4-6amps. It is already 40-60 watts. <<=== who told u !!! it uses a 700mah 15C sayno battery 11.1V = > 700*15=10500/1000 = 10.5 A * 11.1 = 116.55 WThe C rating of battery indicates a batteries maximum rated discharge, not actual discharge.

The heli in the page you're looking at has a 5A ESC by Jeti. So, in normal operation, it should be drawing no more than 5A, plus another 0.5A or so for the receiver, gyro and servos. So 40-60 watts is quite reasonable. The battery will supply 120 watts if you ask for it, but this setup doesn't come close.


grnbrg.

[moustafamagdy]

The C rating of battery indicates a batteries maximum rated discharge, not actual discharge.

The heli in the page you're looking at has a 5A ESC by Jeti. So, in normal operation, it should be drawing no more than 5A, plus another 0.5A or so for the receiver, gyro and servos. So 40-60 watts is quite reasonable. The battery will supply 120 watts if you ask for it, but this setup doesn't come close.


grnbrg.

and the motor abnd gyro will draw about nothing ??

[Almaz]

CP helicopter in the picture consumes 4-6amps. It is already 40-60 watts. <<=== who told u !!! it uses a 700mah 15C sayno battery 11.1V = > 700*15=10500/1000 = 10.5 A * 11.1 = 116.55 W


I think you are confused. If you are using standard 4in1 (esc, bec, gyro, receiver) then internal brushed ESC is rated up to 8amp. Average for your CP heli is 5 amps using 11.1v. Don't take my word for it just connect Data Logger and you'll see the results yourself or you can find similar logs here on RcGroups from the same or similar helicopter.

[grnbrg]

and the motor abnd gyro will draw about nothing ??The motor will only draw what the ESC will give it. And the ESC will only draw a max of 5A.

Yes, the gyro will draw about nothing. Maybe a few dozen milliamps. (ie:0.02A-0.05A) The tail motor might draw an amp or so, too.


grnbrg.

[smh20502]

the reason for the high voltages is because of current. Remember that the outcome is total wattage. Current is the most difficult to produce. Since the current is the most difficult to obtain then we look to voltage to offset the current to obtain the same wattage.

Now, I don't know all the technical aspects of wrapping motors. What I do know is that typically the higher the potentials the more efficient the electronics. This too would apply to motors.

The reason that every one uses the 7.4, 11.1, 22.2 etc. is because of the power source. Batteries are, 1.2 and 3.6, (there are others but I don't remember their potentials). If our batteries were 40, 100 200 volts we'd have motors to match. Since the actual power source is not going to be a conventional battery any discussion regarding the battery as a source is moot.


The only 400v motors that I'm aware of are quite large and wouldn't apply to this application. What is the smallest 400v motor that you can find?

Or, do you know the appropriate math to help so that he can wrap them himself?