Hello Larry,
I am using a mountain bike that was converted by Currie Technologies in
Chatsworth, CA. They use a heavy frame because the 1/2 hp 24 volt motor
developed so much torque that it could flip you back wards if it was
lighter.
I purchase it directly from WalMart.com warehouse that was sent directly to
me fully assembly. The bike weighs 110 lbs and with me on it, it is closer
to 300 lbs. Cost $295.00
The motor has a internal gear box that has a gear ratio of 3:1 and a
sprocket gear chain set that has another 3:1 ratio for a total of 9:1
overall ratio. This gear set is on the rear wheel on the opposite side of
the bike chain gear set which freewheels when the electric drive is on.
It use a motorcycle type variable motor control grip that also indicates
battery state of charge lighting up LED's some what the Link-10 does. There
are two 12 volt 20 ah batteries in a cast aluminum waterproof container that
mounted vertical be hind the vertical tube that goes to the seat and down to
the peddles.
I rarely use the peddle drive, because I am either going up or down hills.
This bike now has be running for 3 years and 8 months on the same battery
pack. It suppose to have a maximum range of 15 miles at 15 mph, but I have
never drove it over 5 miles at a time without charging it. If I only drive
it one mile, it only takes about 15 minutes to charge it.
Roland
----- Original Message -----
From: "Larry Gales" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Sent: Sunday, September 12, 2010 12:56 PM
Subject: [EVDL] Mid-drive motors versus hub motors for electric bicycles
> Most electric bicycles, e-Bikes, are powered by hub motors, either
> un-geared
> or using planetary
> gears. Even the geared hub motors do not use the bicycle gears, they
> merely
> use internal gears
> that allow the motor to run at a much higher speed, and thus reduce the
> size
> and weight of the
> motor while producing more torque than an un-geared hub motor.
>
> But mid-drive motors drive the chain and sprocket directly, and so they
> can
> use the full range of
> gears provided by most bicycles. It appears to me that mid-drive motors
> are
> much superior to hub
> motors for e-bikes, but I would like to hear the opinions of others to see
> if I am on the right
> track. Here are what I consider to be the advantages of mid-drive motors:
>
> (1) They use the full set of gears provided by the bicycle and so provide
> the best torque and
> hill climbing ability for a given size motor
>
> (2) They free the wheels from any weight or drag caused by a hub motor
>
> (3) They eliminate any extra work required to change tires or wheels
>
> (4) They keep the center of mass in the middle of the bike
>
> (5) They actually reduce the wear and tear on the main sprocket and chain
> because the
> force is uniform over the sprocket rotation as opposed to foot pressure
> that
> peaks at
> a few points
>
> (6) The multiplication of the rider's strength is uniform as opposed to
> the
> jerky forces
> provided by torque sensors.
>
> The only disadvantage that I see is lack of re-generative braking, which
> exists in un-geared hub
> motors.
>
> I came across what looks to me to be an almost perfect e-bike at an
> affordable price at:
> http://www.hightekbikes.com/index.html
> a 350 watt mid-drive motor (the motor drives the chain-wheel so that all
> the
> bike gears are
> utilized giving it awesome hill climbing ability and the wheels are
> totally
> free of any extra
> weight or equipment) on an e-bike that weighs only 46 lbs and costs only
> $1600 + sales tax. If
> anyone has an opinion on such a bike I would like to hear it.
>
> Thanks,
>
>
> --
> Larry Gales
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I am using a mountain bike that was converted by Currie Technologies in
Chatsworth, CA. They use a heavy frame because the 1/2 hp 24 volt motor
developed so much torque that it could flip you back wards if it was
lighter.
I purchase it directly from WalMart.com warehouse that was sent directly to
me fully assembly. The bike weighs 110 lbs and with me on it, it is closer
to 300 lbs. Cost $295.00
The motor has a internal gear box that has a gear ratio of 3:1 and a
sprocket gear chain set that has another 3:1 ratio for a total of 9:1
overall ratio. This gear set is on the rear wheel on the opposite side of
the bike chain gear set which freewheels when the electric drive is on.
It use a motorcycle type variable motor control grip that also indicates
battery state of charge lighting up LED's some what the Link-10 does. There
are two 12 volt 20 ah batteries in a cast aluminum waterproof container that
mounted vertical be hind the vertical tube that goes to the seat and down to
the peddles.
I rarely use the peddle drive, because I am either going up or down hills.
This bike now has be running for 3 years and 8 months on the same battery
pack. It suppose to have a maximum range of 15 miles at 15 mph, but I have
never drove it over 5 miles at a time without charging it. If I only drive
it one mile, it only takes about 15 minutes to charge it.
Roland
----- Original Message -----
From: "Larry Gales" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Sent: Sunday, September 12, 2010 12:56 PM
Subject: [EVDL] Mid-drive motors versus hub motors for electric bicycles
> Most electric bicycles, e-Bikes, are powered by hub motors, either
> un-geared
> or using planetary
> gears. Even the geared hub motors do not use the bicycle gears, they
> merely
> use internal gears
> that allow the motor to run at a much higher speed, and thus reduce the
> size
> and weight of the
> motor while producing more torque than an un-geared hub motor.
>
> But mid-drive motors drive the chain and sprocket directly, and so they
> can
> use the full range of
> gears provided by most bicycles. It appears to me that mid-drive motors
> are
> much superior to hub
> motors for e-bikes, but I would like to hear the opinions of others to see
> if I am on the right
> track. Here are what I consider to be the advantages of mid-drive motors:
>
> (1) They use the full set of gears provided by the bicycle and so provide
> the best torque and
> hill climbing ability for a given size motor
>
> (2) They free the wheels from any weight or drag caused by a hub motor
>
> (3) They eliminate any extra work required to change tires or wheels
>
> (4) They keep the center of mass in the middle of the bike
>
> (5) They actually reduce the wear and tear on the main sprocket and chain
> because the
> force is uniform over the sprocket rotation as opposed to foot pressure
> that
> peaks at
> a few points
>
> (6) The multiplication of the rider's strength is uniform as opposed to
> the
> jerky forces
> provided by torque sensors.
>
> The only disadvantage that I see is lack of re-generative braking, which
> exists in un-geared hub
> motors.
>
> I came across what looks to me to be an almost perfect e-bike at an
> affordable price at:
> http://www.hightekbikes.com/index.html
> a 350 watt mid-drive motor (the motor drives the chain-wheel so that all
> the
> bike gears are
> utilized giving it awesome hill climbing ability and the wheels are
> totally
> free of any extra
> weight or equipment) on an e-bike that weighs only 46 lbs and costs only
> $1600 + sales tax. If
> anyone has an opinion on such a bike I would like to hear it.
>
> Thanks,
>
>
> --
> Larry Gales
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL:
> http://lists.sjsu.edu/mailman/private/ev/attachments/20100912/a18a1d13/attachment.html
> _______________________________________________
> | REPLYING: address your message to [email protected] only.
> | Multiple-address or CCed messages may be rejected.
> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> | OTHER HELP: http://evdl.org/help/
> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>
_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev