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Giant Turnigy Motor & Proper ESC - Need Max Power! |
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JPDX10
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Joined: 26/Jun/2009 Online Status: Offline Posts: 21 |
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Topic: Giant Turnigy Motor & Proper ESC - Need Max Power!Posted: 26/Jun/2009 at 3:32am |
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I have a few questions before I make purchase: Goal: get the most power of these motors and make sure the ESC will run for a long time without burning. Project: building an electric scooter (minimal speed is 25mph) I want to get this motor: "Turnigy 80-100-A 180Kv Brushless Outrunner (eq: 70-55)" or the "Turnigy 80-100-B 130Kv Brushless Outrunner (eq: 70-55) " The only difference is the number of turns - will the motor with more turns offer more torque? The wierd question is the motor with less windings has more Wattage.
The "Turnigy 80-100-A 180Kv Brushless Outrunner (eq: 70-55)" is a 7000W motor with 6 Turns I want to build an electric scooter with this motor but what will offer more power and torque is the most important question. Next question: What esc should I use? I want the MAXIMUM POWER out of those motors. I was thinking of using a "TURNIGY K-Force 150A OPTO 2-6S Brushless ESC" but the number of battery cells is 2-6 cells Lithium and Ni-Mh is 6-18. Will the ESC deliver 48V @ 150A? Thanks |
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W3FJW Ron
Platinum (US) USERID: 63218 Forum Admin
Joined: 19/Feb/2009 Location: Tacoma WA Online Status: Offline Posts: 9067 |
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Posted: 26/Jun/2009 at 4:10am |
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Why do you need so much power. Most bike & scooter motors run between 250 to 1,000 watts.
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No. 24V max.
True. NEVER run at 100% for more than a minute or so IMO. Best to only draw 80% of what these motors & ESCs are rated at.
Keep in mind you're dealing with Chinese products that may or may not have parts that can handle at times "Pie in the sky" specs.
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I can only remember half of what I say.... I used to walk on water 'til I found out it was more fun sitting in the boat drinking beer Ron |
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JPDX10
Gold (US) USERID: 263756 Newbie
Joined: 26/Jun/2009 Online Status: Offline Posts: 21 |
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Posted: 28/Jun/2009 at 4:40pm |
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I am building a custom electric scooter. My goal is to reach about 30mph. I have seen other people do this with airplane motors and I know I can do just as good as they did. Quick question - is it bad to run the motor at 100%? If so, HOW DO YOU PROGRAM IT TO RUN AT 80%-85%?
Thanks
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wchiro
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HobbyKing Moderator Joined: 18/Feb/2009 Location: Honolulu Hawaii Online Status: Offline Posts: 1623 |
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Posted: 28/Jun/2009 at 7:27pm |
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It would probably be best to use the High Voltage ESC IMO.
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W3FJW Ron
Platinum (US) USERID: 63218 Forum Admin
Joined: 19/Feb/2009 Location: Tacoma WA Online Status: Offline Posts: 9067 |
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Posted: 29/Jun/2009 at 6:09am |
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It is never good to run any equipment at 100% if you want any longevity out of it.
It is programmed by your hand on the throttle, or, I suppose you could design some electronic circuit to limit current to the motor at some specific point.
Read through the DIY forum for some info on this type of use.
I'll move this thread to DIY where it's more appropriate in a day or two.
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I can only remember half of what I say.... I used to walk on water 'til I found out it was more fun sitting in the boat drinking beer Ron |
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JPDX10
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Joined: 26/Jun/2009 Online Status: Offline Posts: 21 |
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Posted: 29/Jun/2009 at 4:33pm |
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Thanks.
I plan to use a servo tester to run the motor for the electric scooter. Couldn't I program the throttle to be 80%?
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W3FJW Ron
Platinum (US) USERID: 63218 Forum Admin
Joined: 19/Feb/2009 Location: Tacoma WA Online Status: Offline Posts: 9067 |
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Posted: 29/Jun/2009 at 5:27pm |
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No. The servo testers are not programmable nor are the ESCs for that kind of function. Chances are that the pots in the tester are either 5 or 10K and a conventional twist grip throttle could be used. A mechanical stop could be used to limit to 80% or a resistor could be used on the high side of the pot (with a bit of experimentation for value) to limit to 80% as well.
On second thought though, if the ESC is programmed with a servo tester, the throttle range could be set from 0 to 80% by turning the pot to approximatly 80% of what would be full or maximum pot rotation. Couple of ways of doing it I suppose after thinking about it.
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I can only remember half of what I say.... I used to walk on water 'til I found out it was more fun sitting in the boat drinking beer Ron |
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JPDX10
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Posted: 30/Jun/2009 at 6:42am |
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Ok, thanks for the information! :)
What is the proper ESC for the "Turnigy 80-100-A 180Kv Brushless Outrunner (eq: 70-55)"? I want the max power out of this motor.
Note: I says on the website of hobbycity.com that it requires 150A ESC but does the "80-100-A" on the motor name mean it takes 80A to 100A?? I am confused.
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W3FJW Ron
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Posted: 30/Jun/2009 at 8:13am |
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The 80 to 100 is probably the average current. It will draw more under a heavy load but shouldn't be run over 100A for more than 10 to 15 seconds. That's the reason a 150A ESC is recommended. To handle the peak current the motor will probably draw from time to time such as 100% throttle.
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I can only remember half of what I say.... I used to walk on water 'til I found out it was more fun sitting in the boat drinking beer Ron |
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JPDX10
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Posted: 01/Jul/2009 at 11:52am |
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Last question: Should I use the 1) “Turnigy Marine 180A Brushless Boat ESC" should I use the 2) “Turnigy K-Force 150A OPTO 2-6S Brushless ESC” or 3) “Turnigy K-Force 120A-HV OPTO 5-12S Brushless ESC”? AND Is it better with the last ESC so I can put 43.2V (36 Cells Ni-Mh) to get the most power from the motor? Thanks, :D
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