Is a 5304 more efficient, then a 5303?

[maxwell65]

is a 5304 more efficient, then a 5303? is a 5303 harder on the batteries upon takeoff,whereas the 5304 is easier on the batteries as well as the controller.and is the 5305 even more efficient than the 5304?would better range be accomplished with the higher torque less speed 5305 than lets say a 5303? it will be interesting to see the comments on this.

 

[The Mighty Volt]

Uhhh......I bought my 5304 off......YOU!

:lol: :lol:

 

[Drunkskunk]

I can't speak to the 530x series, but i can to the 40X series. the higher number will be more efficent in accelleration, and have a marginal amount more torque at the same voltage. But the top speed will be lower. The full speed of the slower motor will be slightly more efficent than the same speed on the faster motor. Partly because the controller is opperating less efficently at less then full throttle, and partly because the back EMF isn't high enough to lower the internal resistance of the faster motor at less than full speed, so it's not opperating as efficently.

But if the diffrence is more than 5%, I'll eat my Girlfriend's cooking

 

[DervAtl]

But if the diffrence is more than 5%, I'll eat my Girlfriend's cooking

No need for drastic measures ------ we wouldn't want to loose you!

 

[maxwell65]

Uhhh......I bought my 5304 off......YOU!

:lol: :lol:

well of course you did,it all goes towards a worthy cause,a betterment to the world so to speak, :wink: i make no secret to the fact that the only motor i've used so far is the 5303,and of course i know about the fact that the higher the # the more torque less speed factor,however i still have some learnin to do,"aint that right mrs quadrauple?" my question mainly pertains to the actual % of efficiency change between the different series product line,and i want a range # which i will probably not know until i try out the different motors myself.for example i know that my 5303 at 48v20ah lifepo4 using a 48v35amp controller,speeding around without trying to save energy (no pedaling) will give me a range of around 32 to 35kms,im 165lbs and my lifepo4's weigh in at 26lbs, but what about a 5304 or 05,there's more torque less speed,but what about the range??? im an inquiring mind type of guy,gotta know,gotta get the answers,even if it means asking on the forum while at the same time selling the stuff,think of me like a dealer selling cocaine or heroin,maybe i've tried the coke,but ive never tried the heroin,does it hurt to ask the heroin addict what kind of high he experiences as opposed to coke? (hope i dont offend anyone with that last comment,thats just my sick sense of humour) so lets post some range numbers in the hopes of getting more informed.supply info like tire size,battery size,weight of driver,and type of motor.and type of terrain,flat,moderately flat with some hills etc.

 

[dogman dan]

I've got no numbers to back me up, but if you compare a 5304 at full throttle to a 5303 at full throttle the 04 will be slower and therefore go further per watthour. This is simply because of wind resistance being less at a lower speed. Slowing down on the 5303 will result in better range in the end because lowering the drag from wind will blow away any inefficiency from running 3/4 throttle to an end result in more range.

Have you considered relacing the 5303 into a 24" wheel? That would make it's top speed slower, and get you more torque on the starts.

Other methods for reducing drag would help too, with a recumbent of course being the best aero solution to drag.

 

[TylerDurden]

Regarding the 03 vs. 05, but the 04 prolly can be deduced:

Personally, I would look at it like this.

The 05 has a winding cross section of 20 passes of wire (4 wires x 5 turns)

The 03 has a winding cross section of 24 passes of wire (8 wires x 3 turns)


The 03 wind has 17% better copper fill.

The 03 wind has lower resistive losses.

The 03 is capable of higher torque, better power handling, and better top speed.
The difference is in the 03 needing higher phase current to get the same torque as an 05. However, it's able to draw this current at a lower voltage, which means the power being drawn from the batteries will still be the same for a given power level, and the 03 wind is more efficient with the power you feed it due to better copper fill.

IMHO, the 03 is a better option for ALL applications, assuming you have a controller that is up to the task of making it work correctly. If you have a weenie controller, then the 05 would be a better option, though efficiency and performance will be lower.

http://endless-sphere.com/forums/viewtopic.php?f=2&t=15676&start=30

 

[Doctorbass]

for the same power:

5303 = lower volt and higher current
5304 = higher volt and lower current

5303 = lower resistance but if you use more current, the loss should remain the same
5304 = higher resisance but if you use more volt, the loss should remain the same

BUT...

The real loss is in the phase wires resistance and the resistive part of the winding ( winding have inductive and DC resistive part)

So a lower number motor ( 5303 and 5302 for exemple) will need more current for the same power.. and more current mean more heat loss in the phase wires and DC resistive part of the winding.

Alot of people forget that a motor is a number of coils and wires that all have INDUCTANCE and RESISTANCE

And.. I repeat: A motor ALSO have non inductive portion of winding from one coil teeth to another, plus the phase wires that are totrally resistive,

A major difference is about the phase wires.

Since the 5303 and 5302 or 5304 or 5305 or 06 have the same phase wire gauge ( 12 awg), it<s the higher current motor that will have more loss.



My answer: 5303 is less efficient than the 5304 due to the loss in the phase wires

Also
5302 is lower efficiency motor... but at high speed it is the best cause his back emf is so low than you can still push current ( power) to it to continu accelerating)

Otherwise for teh same speed, a 5304 would need twice the voltage!

Doc

 

[johnrobholmes]

Who has the cross sectional copper of the 04? All else equal, that will be the best indicator of efficiency of the motor. System efficiency is another can of worms.


Let us not confuse speed or amp limited acceleration with efficiency. Air resistance (top speed) does not directly change the efficiency of the motor, but it does change the load which has implications on efficiency. We can change voltages or amp limits to suit any wind of motor, however.