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Q: Electronic ( Answered 5 out of 5 stars,   1 Comment )
Question  
Subject: Electronic
Category: Science > Technology
Asked by: gezwez-ga
List Price: $5.00
Posted: 15 Oct 2003 17:59 PDT
Expires: 14 Nov 2003 16:59 PST
Question ID: 266716
Iam working a eclectric scooter SunL no parts and manual 24vdc. With a
electronic control. My question is the throttle is a motorcycle grip
type with a bar magnet  that is about 1/8 x 1 that is croved with
three wires that lay on top of this magnet thats it. How  dose this
work I have put a scope on the wires and didnt tell me anything could
you put a pot. in place of this thing. As you twist the grip the
magnet moves under the there wires the control unit thtakes the signal
and make the electirc speed up faster. the scooter only will ggo 26mph
and people twist the grip harder and harder until it brakes
Answer  
Subject: Re: Electronic
Answered By: denco-ga on 15 Oct 2003 21:25 PDT
Rated:5 out of 5 stars
 
Howdy gezwez,

This Google cache copy of a Wilderness Energy Systems
web page asks the question (about scooters): "How does
the controller determine the speed at which the motor
rotates?"
http://216.239.57.104/search?q=cache:wildernessenergy.com/brushless_motor_overview.html

"The pulses of electricity sent to the hub motor are
determined by the throttle, which is mounted on the
handlebars of your bicycle. The throttle is actually
just a magnet passing by a 'Hall Effects Sensor.'
Power is supplied to the throttle from the battery.
The throttle then rations a small amount of power:
from 0 to 5 Volts, which it sends to the controller.
The amount of voltage sent to the controller is
determined by how much the throttle is twisted.
As the throttle is twisted, 'Hall Effects Sensors'
read the amount of voltage, and send this amount of
voltage to the controller. 5 volts means the
controller does nothing: sends no pulses to the hub
motor, 0 volts means the controller sends electrical
pulses to the hub motor as fast as it can."

The Magnetic Sensors Corporation website describes
the usage of the 3 wires.
http://www.magsensors.com/vss.html

"Hall effect sensors have three wire connections: power
(4.5V DC to 24V DC), ground, and signal output."

This NASA (National Aeronautics and Space Administration)
Tech Brief web page has a great diagram of a throttle type
use of a "Hall-Effect" sensor.
http://www.nasatech.com/Briefs/Oct99/MOC10991.html

"Spectrol has produced an innovative design for a
three-terminal voltage output device that integrates
a Hall-effect sensor and a patented magnetic circuit
to convert radial motion into a voltage-output signal."

If you need any clarification, feel free to ask.


Search strategy:

Google search on: scooter throttle magnet wires
://www.google.com/search?q=scooter+throttle+magnet+wires

Google search on: "Hall-Effect" "three wire"
://www.google.com/search?q=%22Hall-Effect%22+%22three+wire%22

Google search on: "Hall-Effect" throttle
://www.google.com/search?q=%22Hall-Effect%22+throttle

Looking Forward, denco-ga
gezwez-ga rated this answer:5 out of 5 stars and gave an additional tip of: $2.00
very good and very fast thanks very much

Comments  
Subject: Re: Electronic
From: denco-ga on 16 Oct 2003 10:13 PDT
 
Howdy gezwez,

Thanks for the kind comment, five stars and nice tip.

Looking Forward, denco-ga

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