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Jawnn is confused. My symathy to him in his quest. I think that He may have ADD, it runs in my family, and I see it in his confusion. |
Ramble over, |
chuck |
chuck said: |
Jeremy, what you wrote on the scott motors as not being a good motor. As to who is correct? I guess it comes down to personal preferences. Neither Jawnn nor I were discussing the scott motor as an ebike motor. I have found the scott motors to be very dependable. I also use them within their ratings. |
Jeremy, I thanked you for your support on my previous post. |
chuck |
The bottom line is that the base motor that the Scott is built from hasn't got a great reputation for reliability or efficiency. They struggle to get better than around 80% efficiency, which means they run hot if used at anything close to their rated power for any period of time. Running them at lower power levels is... |
Jawnn wrote: "The Scott 1hp upgrade is the motor to use". This isn't expressing a personal preference, it's telling all of us that this motor is better than any other. Sorry, but that is plain wrong. |
BTW, the equations for a PM brushless motor are exactly the same as those for a PM brushed motor. Both motor types are electrically identical, the only difference is that the brushless motors are commutated electronically by FETs in the controller, whereas brushed motors are commutated electro-mechanically via the bru... |
Jeremy |
Jeremy, |
Are you discussing the unite motor?,, |
The scott motor was the motor used on many winning electrathons until the eteks took over. There are still teams competing with the scott motors. |
The scott 1 hp motor that was on my bike was used for about 8000 miles, at its design rating with no problems. I will use it on another build. I now use the scott 5 star 1.6 hp motor, at its design rating with no problems. I bought the 1 hp scott from KTA services for $270 dollars. I bought the scott 1.6 hp motor from... |
Scott motor company is somehow related to Imperial Electric, which is related somehow to the Kinetik co. |
http://www.imperialelectric.com/ |
http://www.thomasnet.com/heading.ht...1462;CNONE&PrdS_SEARCH_PHRASE=Electric+Motors |
As to the motors efficiency as it relates to its applied voltage. Cloud electric, Thunderstruck ev and other ev suppliers have the perfomance graghs for the mars and etek motors at various voltages, very little difference in efficiency on these charts. |
Your analogy to transmitting electric power on the grid does not apply to the efficiency of an electric motor. The 909 mars motor will run just fine for Jawnns' application at 12 volts nominal. |
chuck |
chuck said: |
John, |
When I posted on your welding aluminum thread I was'nt familiar with your vehicle. I saw a picture of a blue bike, I don't even know what motor you use. I just did a quick web search on dc brushless motors. |
Appears to me that brushless hub motors are wound in series, and have similar characteristics to brushed motors |
. |
I looked up brushless dc motors in my Marks handbook, silent. |
There is a possibility, perhaps, that you are still in the efficient zone of your brushless motor? Not close to the no load speed? |
According to wiki, at high load the characteristics of the brushless motor, Y connected , jeez, I hope I have that right, is very similar to brushed. |
To make it perfectly clear to everbody here, this leads me to believe, at this point, that John, even at high speed, is still in the efficient range of his motor. |
chuck |
It would be inherently impossible for them to be brushless and series wound... |
They are PMBLDC, the PM part meaning that the rotor field is created with permanent magnets. |
This means BEMF is a constant with RPM, meaning rotor field does not field weaken as RPM's increase like a series wound brushed motor, which gives them VERY different behavior than a series-brushed. This gives them an efficiency curve which looks VERY different. In fact, this style of motor enables 2-3 or even 4 h... |
Also, you're applying concepts of a constant freq induction motor characteristics to PMBLDC (like current increases from slip type relationships). |
These PMBLDC machines are synchronous, always. |
It would be fair to call it a radically different animal, that also happens to make a shaft spin from a magnetic field. |
The initial post (and the title) have yet again been edited, to be completely irrelevant....... |
Miles said: |
The initial post (and the title) have yet again been edited, to be completely irrelevant....... |
Is it time to put on your ' |
moderator hat |
' Mr |
Miles |
and either delete or lock the thread? |
KiM |
AussieJester said: |
Miles said: |
The initial post (and the title) have yet again been edited, to be completely irrelevant....... |
Is it time to put on your ' |
moderator hat |
' Mr |
Miles |
and either delete or lock the thread? |
KiM |
I could lock it. What do the contributors to it think? |
I'd lock it. It's chock full of misinformation and if it continues to sit in the "new posts" first page someone might be mislead into thinking some of the stuff in the original post is sound advice and waste a lot of time and money. |
We've always strived to ensure that this forum has the best collective knowledge pool of currently available light electric vehicle technology, and I don't think we want to dilute that with outdated and misleading information, some of it from a time when the state of the art was very different. |
Jeremy |
done. |
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