DrkAngel
1 GW
I already did a sprocket size for a 5000 rpm motor you decided on.
new eZip motor
- Thread starter latecurtis
- Start date
- Status
latecurtis
100 MW
That was for a 26" wheel I think. This application will be for a 20" wheel and a 90 tooth sprocket and maximum rpm is 8,750. I will look for your formula. I am not sure if it was even on this post it was so long ago. Also it was for a #25 chain and sprocket. I will look for the formula now after I order the 36V charger.
After that I am going to the electric city bike club to look for a bike for parts. Tires at Wall-Mart are $20 each and tubes $4 each. I can get a whole bike for about half of that and get the V brake parts I need for the front of the Trek hopefully. I will try to find the formula but if you have time can you post a motor sprocket for 8,750 rpm with a 90 tooth wheel sprocket on a 20" wheel. I choose the 20" wheel so I would not need gear reduction. My question is will it work?
After that I am going to the electric city bike club to look for a bike for parts. Tires at Wall-Mart are $20 each and tubes $4 each. I can get a whole bike for about half of that and get the V brake parts I need for the front of the Trek hopefully. I will try to find the formula but if you have time can you post a motor sprocket for 8,750 rpm with a 90 tooth wheel sprocket on a 20" wheel. I choose the 20" wheel so I would not need gear reduction. My question is will it work?
latecurtis
100 MW
http://www.ebay.com/itm/ZEUS-PCCG-SLA12V1800-12V-1-8A-3-Stage-Charger-for-12V-7Ah-33Ah-SLA-Batteries-/391070461730?pt=LH_DefaultDomain_0&hash=item5b0d9daf22
I have to deposit at least $5 more in the bank tomorrow to get this. I don't see any 36V 3 stage chargers. No I did not get a chance to read about them however am taking your word that they are better for the SLAs than a regular charger. Also I could not find a 1.5A. this is 1.8A right? If you know where I can get a 1.5A I will order one instead. Please let me know if I should order it or not. I don't mind charging one at a time as long as the 3 stage charger will keep my SLA batteries going longer. I will be at the library tomorrow to order something $25 is the absolute limit with shipping. Please post before tomorrow if you can.
Thanks. LC. out.
I have to deposit at least $5 more in the bank tomorrow to get this. I don't see any 36V 3 stage chargers. No I did not get a chance to read about them however am taking your word that they are better for the SLAs than a regular charger. Also I could not find a 1.5A. this is 1.8A right? If you know where I can get a 1.5A I will order one instead. Please let me know if I should order it or not. I don't mind charging one at a time as long as the 3 stage charger will keep my SLA batteries going longer. I will be at the library tomorrow to order something $25 is the absolute limit with shipping. Please post before tomorrow if you can.
Thanks. LC. out.
latecurtis
100 MW
1. motor rpm x motor sprocket ÷ wheel sprocket = wheel rpm (revolutions per minute)
3000 x 9 ÷ 90 = 300rpm
2. wheel size" x 3.14 ÷ 12" ÷ 5280' = mpr (miles per revolution)
26 x 3.14 ÷ 12 ÷ 5280 = .00128 mpr (miles per revolution)
3. rpm (revolutions per minute) x mpr (miles per revolution) = mpm (miles per minute) x 60 minutes = mph (miles per hour)
300 x .00128 = .38655 x 60 = 23.19mph
I found your formula DA. I am going to try to calculate that now.
3000 x 9 ÷ 90 = 300rpm
2. wheel size" x 3.14 ÷ 12" ÷ 5280' = mpr (miles per revolution)
26 x 3.14 ÷ 12 ÷ 5280 = .00128 mpr (miles per revolution)
3. rpm (revolutions per minute) x mpr (miles per revolution) = mpm (miles per minute) x 60 minutes = mph (miles per hour)
300 x .00128 = .38655 x 60 = 23.19mph
I found your formula DA. I am going to try to calculate that now.
latecurtis
100 MW
20" * 3.14 divided by 12 divided by 5280 = 9.91 (miles per revolution)
9.91. That number does not make any sense. I got a guy here at the library trying to figure it out. I cant use that number. The librarian figured it out. it is .00091
300 * .000991 = .273 * 60 = 16.38 mph. did something wrong.
8,700 * 11 divided by 90 = 1063 (revolutions per minute)
20' * 3.14 divided by 5280 = .01189 ( miles per revolution)
1063 * .01189 = 12.639 * 60 = 758.34 mph.
I did that three times and came up with the same number. I got to go to the bike club. My guess is 75.8 mph. I will need a larger sprocket for 40 mph.
8700 * 9 / 120 = 652.5 * .01189 = 7.75 * 60 = 465.4 or 46.5 mph.
That's as far as I got. 8700 is about maximum@60V. If I calculate it at 7,000 it will be smaller.
7000 * 9 / 90 = 700. 700 * .00128 = .896 * 60 = 53.76 mph.
7000 * 9 / 120 = 526 * .00128 = .672 * 60 = 40.32 mph.
Where can I find a 120 tooth sprocket? Do they make one?
It does matter what size chain right? As long as I can put a #25 on the motor it will work. However is a larger link chain better for higher torque and rpm. Also I may not find a 120 tooth #25 sprocket. Will a larger chain size effect your formula? Please let me know. Thanks. LC. out.
Please let me know. I have to go.
9.91. That number does not make any sense. I got a guy here at the library trying to figure it out. I cant use that number. The librarian figured it out. it is .00091
300 * .000991 = .273 * 60 = 16.38 mph. did something wrong.
8,700 * 11 divided by 90 = 1063 (revolutions per minute)
20' * 3.14 divided by 5280 = .01189 ( miles per revolution)
1063 * .01189 = 12.639 * 60 = 758.34 mph.
I did that three times and came up with the same number. I got to go to the bike club. My guess is 75.8 mph. I will need a larger sprocket for 40 mph.
8700 * 9 / 120 = 652.5 * .01189 = 7.75 * 60 = 465.4 or 46.5 mph.
That's as far as I got. 8700 is about maximum@60V. If I calculate it at 7,000 it will be smaller.
7000 * 9 / 90 = 700. 700 * .00128 = .896 * 60 = 53.76 mph.
7000 * 9 / 120 = 526 * .00128 = .672 * 60 = 40.32 mph.
Where can I find a 120 tooth sprocket? Do they make one?
It does matter what size chain right? As long as I can put a #25 on the motor it will work. However is a larger link chain better for higher torque and rpm. Also I may not find a 120 tooth #25 sprocket. Will a larger chain size effect your formula? Please let me know. Thanks. LC. out.
Please let me know. I have to go.
latecurtis
100 MW
7000 * 9 / 90 = 700
20 * 3.14 / 12 / 5280 = .000991
700 * .000991 = .6937
.6937 * 60 = 41.622mph
I caught my mistake. I think the 90 tooth will work. Pleas let me know. Got to go. please check it if you can DA. Thanks. LC. out.
20 * 3.14 / 12 / 5280 = .000991
700 * .000991 = .6937
.6937 * 60 = 41.622mph
I caught my mistake. I think the 90 tooth will work. Pleas let me know. Got to go. please check it if you can DA. Thanks. LC. out.
DAND214
10 MW
It doesn't make any difference what size chain you use to get the ratio. It's always the big gear divided by the small one to get the ratio.
Oh, one thing, they have to be the same pitch. Both sprockets need to use the same chain
Dan
Oh, one thing, they have to be the same pitch. Both sprockets need to use the same chain
Dan
DrkAngel
1 GW
26" - 7000 * 11 / 256 = 300rpm ... 23mphDrkAngel said:
20" - 7000 * 11 / 197 = 300rpm ... 23mph
20" - 7000 * 11 / 100 = 600rpm ... 45mph
45mph requires 3200w motor tho ...
DrkAngel
1 GW
1500w will only push you along at 35mph maximum on good level ground.DrkAngel said:
20" - 7000 * 11 / 130 = 465rpm ... 35mph
So, you would want an 11T motor sprocket and a 130T wheel sprocket.
Might want to go larger wheel sprocket if you intend on running into any hills ...
But ... again ... powerful front motor is reasonably suicidal.
Spin the front tire and you will likely be going down fast!
Small wheel-chopper amplifies this danger!!!
Good news tho ...
You won't be able to accelerate very hard from a dead stop.
Should help reduce the massive inefficiency of large amp input at low motor rpm.
(Full throttle will likely result in dumping bike ... even during good road conditions!)
Small 20" front wheel is libel to disappear into NYS potholes, so pad steering post so as to avoid denuttation and wear full helmet to reduce faceplant damage!
Auto ejection seat w/parachute function?
latecurtis
100 MW
latecurtis
100 MW
As the Hub motor Turns and the Lipo Fire Burns.
I am back from the library. I got the SLAs on the SLA chargers. They were a lot better today after using the SLA chargers instead of the Mega charger. I really can’t figure out why though because the standing voltage is about the same. It is puzzling.
I got two decent tires and tubes for $10. The guy there said $15 was too much. Since I don’t have money falling out of my pockets I was happy with that. They also had a 20" rim but it did not have threads for the 90 tooth sprocket.
I was told that I may have to buy a hub and build a 20" wheel. I also was told about some famous guy who died in 2012 who has a web site about custom building bicycle wheels. I forgot the name though. My short term memory is not good. That is one of the reasons why DA. Had to post things many times over for me.
I hope I don’t have to build a custom wheel, However if that is what it takes I will do it. Someone posted wheel hubs on the fork motor post. I can get one for about $25. I can get a 20" rim for $5 at the bike club.
I was wondering how that formula of yours works DA. The thing I don’t get is there are so many different size chains and # sprockets. How could they all work with the same formula? Wheel size is a given but not all wheel sprockets are the same diameter. The same goes with motor sprockets.
However if you were to measure the exact diameter of the sprockets (wheel and motor) to the millimeter. Then measure the diameter of the wheel with the tire on it. A formula could be made that would work for any installation.
I will need a different 90 tooth sprocket that will fit on a standard 20" rear bike wheel. If the part don’t exist I guess I will be building a wheel or looking for a custom wheel that is affordable ( under $50 ). If anyone has any suggestions it will be greatly appreciated.
Please let me know also if there was sound with the new video Jump2. mpeg1 dont post and I had to convert it to MP4. MP4 won’t play on the old PC. (single core Vista) 20 year old software was used, MGI photo suite. and windows movie maker. I don’t have that new green screen technology. Dont have a clue about it.
That was done frame by frame. the old school way. Plus a newer digital camera. They must be unbreakable now with that mug shot. I wonder what I could do with the newer technology. I would like to find out if I could get it for free.
MP4 plays on my new dual core PC with windows 7 but I don’t have speakers hooked up to it. It is my first music video and second e bike jump. The box truck jump is still happening this summer but will require at least 60V or 2 kilowatts minimum. The thumb up was from me to all ES members who have been here for me with support and good advice. That’s also why I used the Trek for this jump. Without the support I got it would not exist. You guys are Awesome.
Thanks. LC. out.
I am back from the library. I got the SLAs on the SLA chargers. They were a lot better today after using the SLA chargers instead of the Mega charger. I really can’t figure out why though because the standing voltage is about the same. It is puzzling.
I got two decent tires and tubes for $10. The guy there said $15 was too much. Since I don’t have money falling out of my pockets I was happy with that. They also had a 20" rim but it did not have threads for the 90 tooth sprocket.
I was told that I may have to buy a hub and build a 20" wheel. I also was told about some famous guy who died in 2012 who has a web site about custom building bicycle wheels. I forgot the name though. My short term memory is not good. That is one of the reasons why DA. Had to post things many times over for me.
I hope I don’t have to build a custom wheel, However if that is what it takes I will do it. Someone posted wheel hubs on the fork motor post. I can get one for about $25. I can get a 20" rim for $5 at the bike club.
I was wondering how that formula of yours works DA. The thing I don’t get is there are so many different size chains and # sprockets. How could they all work with the same formula? Wheel size is a given but not all wheel sprockets are the same diameter. The same goes with motor sprockets.
However if you were to measure the exact diameter of the sprockets (wheel and motor) to the millimeter. Then measure the diameter of the wheel with the tire on it. A formula could be made that would work for any installation.
I will need a different 90 tooth sprocket that will fit on a standard 20" rear bike wheel. If the part don’t exist I guess I will be building a wheel or looking for a custom wheel that is affordable ( under $50 ). If anyone has any suggestions it will be greatly appreciated.
Please let me know also if there was sound with the new video Jump2. mpeg1 dont post and I had to convert it to MP4. MP4 won’t play on the old PC. (single core Vista) 20 year old software was used, MGI photo suite. and windows movie maker. I don’t have that new green screen technology. Dont have a clue about it.
That was done frame by frame. the old school way. Plus a newer digital camera. They must be unbreakable now with that mug shot. I wonder what I could do with the newer technology. I would like to find out if I could get it for free.
MP4 plays on my new dual core PC with windows 7 but I don’t have speakers hooked up to it. It is my first music video and second e bike jump. The box truck jump is still happening this summer but will require at least 60V or 2 kilowatts minimum. The thumb up was from me to all ES members who have been here for me with support and good advice. That’s also why I used the Trek for this jump. Without the support I got it would not exist. You guys are Awesome.
Thanks. LC. out.
latecurtis
100 MW
http://www.goldenmotor.com/
latecurtis
100 MW
1500W BLDC Motor
Model: BLDC-108
1. Voltages: 48Vdc
2. Rated power: 1.5KW
3. Peak power: 3.0KW
4. Speed: 3200-5000rpm
5. Rated torque: 4 Nm
6. Peak torque: 8 Nm
7. Efficiency: >85%
8. Dimensions: 11x10cm
9. Weight: 3.9kgs = 8.59lbs
48V 1500W - $129
Model: BLDC-108
1. Voltages: 48Vdc
2. Rated power: 1.5KW
3. Peak power: 3.0KW
4. Speed: 3200-5000rpm
5. Rated torque: 4 Nm
6. Peak torque: 8 Nm
7. Efficiency: >85%
8. Dimensions: 11x10cm
9. Weight: 3.9kgs = 8.59lbs
48V 1500W - $129
latecurtis
100 MW
5000 * 15 / 90 = 833
20 * 3.14 / 12 / 5280 = .000991
833 * .000991 = .825503
.825503 * 60 = 49.53 mph
5000 * 13 / 90 = 722
722 * .000991 = .715502
.715502 * 60 = 42.93 mph
20 * 3.14 / 12 / 5280 = .000991
833 * .000991 = .825503
.825503 * 60 = 49.53 mph
5000 * 13 / 90 = 722
722 * .000991 = .715502
.715502 * 60 = 42.93 mph
latecurtis
100 MW
If I don't get 40mph@48V then we will go with 60V LOL.
I should have looked at golden motor awhile ago. They look like the real deal.
I think they even have a 20 hp motor. I need to look again.
I need to order a 3 stage SLA charger. I have not found one at 36V. However I have the money for the 12V 3 stage model. I am ordering it now.
Thanks. LC. out.
I should have looked at golden motor awhile ago. They look like the real deal.
I think they even have a 20 hp motor. I need to look again.
I need to order a 3 stage SLA charger. I have not found one at 36V. However I have the money for the 12V 3 stage model. I am ordering it now.
Thanks. LC. out.
latecurtis
100 MW
20KW BLDC motor.
•Long working life (>20,000 hours)
•Low noise, high torque
• Excellent performance characteristics
•High efficiency (>90%)
•High reliability
•Rated voltage : 24-120 VDC
•Rated power : 200W-20,000W
•Rated speed: 2000-6000 rpm
•Stepless speed control, dual-direction
Yea. I am impressed!!!
•Long working life (>20,000 hours)
•Low noise, high torque
• Excellent performance characteristics
•High efficiency (>90%)
•High reliability
•Rated voltage : 24-120 VDC
•Rated power : 200W-20,000W
•Rated speed: 2000-6000 rpm
•Stepless speed control, dual-direction
Yea. I am impressed!!!
latecurtis
100 MW
http://www.ebay.com/itm/ZEUS-PCCG-SLA12V1800-12V-1-8A-3-Stage-Charger-for-12V-7Ah-33Ah-SLA-Batteries-/391070461730?pt=LH_DefaultDomain_0&hash=item5b0d9daf22
Status. ORDERED.
When I get it I will be 3 stage charging each SLA exclusively.
Will a 48V LIFEPO4 pack be good for 40 mph on that motor?
I could order 4 or 5 10Ah SLAs but that motor would blow up 10 Ah SLAs right?
It would be kind of fun to blow up an SLA though. However I could live without an acid shower. LOL.
Stay tuned for another episode of. AS the Hub Motor Turns and the Lipo Fire Burns. Thanks. LC. out.
Status. ORDERED.
When I get it I will be 3 stage charging each SLA exclusively.
Will a 48V LIFEPO4 pack be good for 40 mph on that motor?
I could order 4 or 5 10Ah SLAs but that motor would blow up 10 Ah SLAs right?
It would be kind of fun to blow up an SLA though. However I could live without an acid shower. LOL.
Stay tuned for another episode of. AS the Hub Motor Turns and the Lipo Fire Burns. Thanks. LC. out.
latecurtis
100 MW
https://www.livehelpnow.net/lhn/console/docview.aspx?c=24196&s=chats&ct=application/vnd.ms-excel&f=d839911a-4ef5-49fe-859c-1b8cbbe.xls&of=bldc-108+test+data.xls
test data on the golden motor. I got it from a live online operator. her picture was kind of hot.
That data should determine whether I should go with a 15 tooth motor sprocket for 49mph or the 13 tooth for 42mph
Please check it out DA. and let me know. Make sure you check out my video jump2.
I will be online tomorrow. Thanks. LC.out
test data on the golden motor. I got it from a live online operator. her picture was kind of hot.
That data should determine whether I should go with a 15 tooth motor sprocket for 49mph or the 13 tooth for 42mph
Please check it out DA. and let me know. Make sure you check out my video jump2.
I will be online tomorrow. Thanks. LC.out
latecurtis
100 MW
I took a look at the information. They made an error on the graph. line 10. should be 47.27 and line 9 should be 47.29.
47.27 = 3.51 torque. 47.27 / 12 = 3.939V so when my 6s Lipo packs reach that voltage the motor should operate at peak efficiency. However that does not tell me if it will make the bike roll at 49mph with a 15 tooth sprocket or not. However it does tell me that my Lipo packs will run the motor much better than 60V of LIFEPO4 or SLA.
I wont need to buy batteries but will I be exceeding the discharge rate of the Lipos?
That is a question for you DA. I am getting smarter with this every day but your still the man. Please let me know. I plan on ordering the motor as soon as I get the money.
Thanks. LC. out.
47.27 = 3.51 torque. 47.27 / 12 = 3.939V so when my 6s Lipo packs reach that voltage the motor should operate at peak efficiency. However that does not tell me if it will make the bike roll at 49mph with a 15 tooth sprocket or not. However it does tell me that my Lipo packs will run the motor much better than 60V of LIFEPO4 or SLA.
I wont need to buy batteries but will I be exceeding the discharge rate of the Lipos?
That is a question for you DA. I am getting smarter with this every day but your still the man. Please let me know. I plan on ordering the motor as soon as I get the money.
Thanks. LC. out.
DrkAngel
1 GW
Sprocket ratio is by number of teeth, not sprocket size!!!
Must be same tooth pitch-type though.
1500w motor will not push any "normal" bike past 35mph!
Must be same tooth pitch-type though.
1500w motor will not push any "normal" bike past 35mph!
latecurtis
100 MW
Model: BLDC-108
1. Voltages: 48Vdc
2. Rated power: 1.5KW
3. Peak power: 3.0KW -----------------What about this! That should be good for an extra 5mph or so?
4. Speed: 3200-5000rpm
5. Rated torque: 4 Nm
6. Peak torque: 8 Nm
7. Efficiency: >85%
8. Dimensions: 11x10cm
9. Weight: 3.9kgs
1. Voltages: 48Vdc
2. Rated power: 1.5KW
3. Peak power: 3.0KW -----------------What about this! That should be good for an extra 5mph or so?
4. Speed: 3200-5000rpm
5. Rated torque: 4 Nm
6. Peak torque: 8 Nm
7. Efficiency: >85%
8. Dimensions: 11x10cm
9. Weight: 3.9kgs
DrkAngel
1 GW
3kWh output = ...
6000w input ÷ 48V = 125Amps from a 9Ah battery ... ouch!
Enough power to run 6 1000w heaters ... for a couple minutes ... then ... buy new lipo for next mile or 2!
Use 48V 12Ah Lead Acid!
Might get less than 1 mile but a lot cheaper to replace!!!
6000w input ÷ 48V = 125Amps from a 9Ah battery ... ouch!
Enough power to run 6 1000w heaters ... for a couple minutes ... then ... buy new lipo for next mile or 2!
Use 48V 12Ah Lead Acid!
Might get less than 1 mile but a lot cheaper to replace!!!
DAND214
10 MW
DrkAngel said:
Very well put.
You need a bigger tank to go fast, Electric or ICE!
The more WATTS you want the more it costs!
Dan
DrkAngel
1 GW
I prefer getting decent range at reasonable speed rather than getting almost nowhere fast.DrkAngel said:
DrkAngel
1 GW
See - http://wiki.xtronics.com/index.php/Sealed_Lead_Acid_Battery_Applications for a brief-simple guide to SLA ... has pictures!
- Status
