36v power tool motor to replace scooter motor?

[John Doe]

Does this sound right?

motor shaft revolutions per scooter wheel revolution
8.15
wheel circumference
39.27"
wheel movement per shaft revolution
4.82"
motor shaft revolutions per minute (estimated)
3500
inches traveled per hour
1,011,900
inches in a mile
63360
miles per hour
15.97

I am pretty sure that motor can propel me at 16 mph. And as long as
the motor shaft revolutions per minute estimate is not too small,
seems to me it will work.

In that case, I just have to put the small sprocket on the bash motor
shaft and mount it.

I would like to use a Bosch 36V cordless hammer drill motor. The
electric scooter motor is the stock eZip 750, supposedly 750W. A
Bosch motor is small compared to the scooter motor. The biggest
benefit will be the very light lithium ion batteries, versus the very
heavy SLA stock scooter batteries.

 

[Nobody]

Does this sound right?

You're only considering the speed. You also need to consider the torque or
power (power = torque * angular speed).

And even if you can find a 750W cordless drill motor, the scooter motor
will be intended to run at full power for extended periods, while the
drill motor is likely to be rated based upon intermittent use.

 

[amdx]

Does this sound right?

motor shaft revolutions per scooter wheel revolution
8.15
wheel circumference
39.27"
wheel movement per shaft revolution
4.82"
motor shaft revolutions per minute (estimated)
3500
inches traveled per hour
1,011,900
inches in a mile
63360
miles per hour
15.97

I am pretty sure that motor can propel me at 16 mph. And as long as
the motor shaft revolutions per minute estimate is not too small,
seems to me it will work.

In that case, I just have to put the small sprocket on the bash motor
shaft and mount it.

I would like to use a Bosch 36V cordless hammer drill motor. The
electric scooter motor is the stock eZip 750, supposedly 750W. A
Bosch motor is small compared to the scooter motor. The biggest
benefit will be the very light lithium ion batteries, versus the very
heavy SLA stock scooter batteries.

Yes, I get 15.97 MPH.
When was the last time you ran your Bosch
drill for 15 minutes at full load?
Maybe the scooter motor is bigger for a reason.
Here's my fun with electric motors.

I have since got the new deep cycle batteries.
MikeK

 

[John Doe]

"amdx" <amdx knology.net> wrote:

....

Yes, I get 15.97 MPH.
When was the last time you ran your Bosch drill for 15 minutes
at full load? Maybe the scooter motor is bigger for a reason.

My problem is the SLA batteries that weigh 17 pounds, way too
heavy. I need to remake my "push stick" into something
significantly lighter. My application resembles this guy's "Roller
Cycle", except mine must be electric.

http://j.b5z.net/i/u/2055639/f/ongrass.ram

You can find "Roller Cycle" on YouTube too.

That requires being able to inline skate well, and it is radical.
The stroking is just for show, you do not need to stroke when
being pushed 15 mph or faster. He is using Rollerblade Coyotes, an
out of production off-road skate.

Here's my fun with electric motors.

That is neat. Good to see the helmets. Skaters (all types) should
wear helmets, but too often do not.
--

 

[PeterD]

"amdx" <amdx knology.net> wrote:

...


My problem is the SLA batteries that weigh 17 pounds, way too
heavy. I need to remake my "push stick" into something
significantly lighter. My application resembles this guy's "Roller
Cycle", except mine must be electric.

http://j.b5z.net/i/u/2055639/f/ongrass.ram

You can find "Roller Cycle" on YouTube too.

That requires being able to inline skate well, and it is radical.
The stroking is just for show, you do not need to stroke when
being pushed 15 mph or faster. He is using Rollerblade Coyotes, an
out of production off-road skate.


That is neat. Good to see the helmets. Skaters (all types) should
wear helmets, but too often do not.

First seperate battery technology from the motor requirements. Using
LiON batteries may work. Using a Bosch drill for power certainly
won't, at least not for very long...

 

[John Doe]

I took the scooter motor cover off and a 3/8 inch diameter soft
rubbery round O-ring fell out. Any clue as to what that was for? It
was broken, pretty weak. My guess is that it was being used for the
front bearing spacer. There is not much else in there, except big
magnets and the rotor.

So I screwed the motor cover back on and attached the 36 V cordless
drill controller to the motor contacts. Appears to work fine,
probably should watch out for excessive heat?

The motor is rated for up to 48V.

Thanks.