CyberCrime
100 mW
- Joined
- Mar 26, 2013
- Messages
- 41
Are there any Direct Drive motors that come close to the mac 8t for top speed and torque using the same amps/volts?
Mac = Direct Drive
- Thread starter CyberCrime
- Start date
Have you looked in the http://www.ebikes.ca/tools/simulator.html?
You may have to adjust the throttle to make the top speed match up.
You may have to adjust the throttle to make the top speed match up.
cal3thousand
10 MW
CyberCrime said:
Top speed yes. but not torque at the same time. It's hard to match the torque of a well powered MAC. Having said that, pump enough juice into a DD off the line and you can get the same torque (but now your same amps/volts requirement is out the door)
dogman dan
1 PW
No. There isn't. But if you have enough watts, the torque of a dd may be plenty. Or, at enough watts, you might melt a gearmotor too quick.
Much depends on what amps and volts you are interested in. If you want 3000w, then dd is the choice IMO. At 3000w, dd motors have some pretty decent torque. At 800w, the dd motor will feel pretty lame in torque. They will never be equal, but if you have enough watts, torque is adequate either way, and the decision comes down to how fast will it melt the way you will ride it.
This is what is making the newer bb drives interesting. 750w sounds lame for climbing really steep hills, but if you are willing to slow down, then you can climb that hill with a shitload of torque. By running the motor efficiently in a very low gear, you can waste less of your same volts and amps into heat. So its more less waste, than more torque. The end result is more of the watts do reach the rubber.
But, that means a slower speed up the steeper hills. But by upshifting on the flat, it should be possible to get the same speed out of the same watts. Being able to shift means a lot, but it also means you need to know when to shift.
We have had bb drives for a long time, the one I have is quite old, but at 250w it's not so exciting. But if it was 750w, it would be able to do a lot more, including speeds to 25 mph. We have that now, or will soon this spring, without the extra chain or belt.
Much depends on what amps and volts you are interested in. If you want 3000w, then dd is the choice IMO. At 3000w, dd motors have some pretty decent torque. At 800w, the dd motor will feel pretty lame in torque. They will never be equal, but if you have enough watts, torque is adequate either way, and the decision comes down to how fast will it melt the way you will ride it.
This is what is making the newer bb drives interesting. 750w sounds lame for climbing really steep hills, but if you are willing to slow down, then you can climb that hill with a shitload of torque. By running the motor efficiently in a very low gear, you can waste less of your same volts and amps into heat. So its more less waste, than more torque. The end result is more of the watts do reach the rubber.
But, that means a slower speed up the steeper hills. But by upshifting on the flat, it should be possible to get the same speed out of the same watts. Being able to shift means a lot, but it also means you need to know when to shift.
We have had bb drives for a long time, the one I have is quite old, but at 250w it's not so exciting. But if it was 750w, it would be able to do a lot more, including speeds to 25 mph. We have that now, or will soon this spring, without the extra chain or belt.
CyberCrime said:
You will need something that is a step up from the common 9C-type motor in order to get that level of power output, or higher.
IE magic pie, crystalyte HS35xx, etc.
Said motors will outperform the MAC a bit, but also shed heat during the abuse better than the MAC does, for sure.
dogman dan
1 PW
But assuming the said same amps and volts is only 800w, wouldn't the mac pull better in the first 10 feet, especially an uphill start? Because less watts gets wasted into the heat? Once they wind up to speed, then both would have the same power more or less.
Bump the watts to 2000, and for damn sure the dd motors will perform good enough for most needs.
Bump the watts to 2000, and for damn sure the dd motors will perform good enough for most needs.
My MAC performed better in all tests i put it through.. hill climbing, 0 to top speed on 4000W, time to overheat, etc.
I posted these videos and info 3 years ago.
I was comparing whatever winding of MXUS that runs at 23mph on 36v, versus an 8T MAC ( 25mph on 36v ). With both motors on the same battery voltage and controller.
I posted these videos and info 3 years ago.
I was comparing whatever winding of MXUS that runs at 23mph on 36v, versus an 8T MAC ( 25mph on 36v ). With both motors on the same battery voltage and controller.
cal3thousand
10 MW
My wife's MAC continues to be the best bike we have at 48V or less. Torque is strong all the way to top speed and we are only running stock settings. 1.5kW peaks.
It's even more fun to ride than my 24S HT3525 since it's not tuned yet.
It's even more fun to ride than my 24S HT3525 since it's not tuned yet.
CyberCrime
100 mW
- Joined
- Mar 26, 2013
- Messages
- 41
Battery I will be using is Paul's Triangle Pack 25Ah
I have a mac and its great, just wondering if there is a DD what would be better and last longer in the long run
I have a mac and its great, just wondering if there is a DD what would be better and last longer in the long run
cwah
100 MW
Get a bit DD such as a cromotor. Torqur would be similat to the mac due to 50mm stator width
cal3thousand
10 MW
Cromotor would be great if you can deal with the price penalty, weight penalty, and 150mm dropout requirements.
For a normal bike, MACs kill it... not sure why you would need a DD unless you are going to go all out. To me, for anything under 48V, I'm going MAC (if a hub). If you want to be able to run more than 2kW, get a DD that is capable.
For a normal bike, MACs kill it... not sure why you would need a DD unless you are going to go all out. To me, for anything under 48V, I'm going MAC (if a hub). If you want to be able to run more than 2kW, get a DD that is capable.
nechaus
100 kW
Magic pie running at 20s lipo 50+ amps...
BMX
with a 80kg guy, you can do a long burn out with the right tyres on the grass to last for agessss....
can sometimes pop power wheelies... the torque on the pies are pretty good for a pretty low power rated motor... they are decent... way better than the smaller 9c's
BMX
with a 80kg guy, you can do a long burn out with the right tyres on the grass to last for agessss....
can sometimes pop power wheelies... the torque on the pies are pretty good for a pretty low power rated motor... they are decent... way better than the smaller 9c's
ebike11 said:
The 8T is quite lively and able to climb most hills. It has reasonably good acceleration. The 10T is much more powerful and slightly lifts the bike under hard acceleration. It flies up hills. The 8T will be more than adequate for all but the steepest hills. The 10T will be good for nearly every hill you are likely to come across short of living on a precipitous mountain. The 12T will go up anything.
Veloman has a 6T MAC. He is a powerful cyclist but even he finds the torque quite weak. You may want to talk to him. If you have hills you may want to forget about the 6T.
dogman dan
1 PW
I rode Wineboys 6t once. Very weak on take off, but like all fast winds, a nice cruise once it gets going. Great on open roads, and really, quite able to climb shallower hills, like a 7% grade with little heat penalty.
But in bad stop and go, or steeper hills, heat will be made. No big deal in some climates, big deal in mine.
But in bad stop and go, or steeper hills, heat will be made. No big deal in some climates, big deal in mine.
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