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Small D.C. motor with tacho source

D

Dave Boland

Jan 1, 1970
0
I'm doing some software that will measure speed of rotation
and direction (quadrature). Early hardware not selected,
and of course not available yet. So does anyone know where
I can find an inexpensive d.c. motor that has a tacho with
signals for speed and quadrature? I've looked at Radio
Shack, Edmund's, and two robotic web sites so far. Spec's:

Speed: Don't care
Torque: Don't care
Size: Don't care
Shaft size: Don't care as long as it will easily connect to
tacho
Voltage: 0 to 5 if possible
Current: Low current so can run on D cells
Cost: Very low since this is a throw-away part.

I can't think of anything else to specify. The motor will
be driven using PWM most likely, but a buffered DAC can also
be used.

Thanks for any help.

Dave,
 
T

Tim Williams

Jan 1, 1970
0
IRTA "Small DC motor with taco sauce".

LOL

Tim
 
R

Roger Hamlett

Jan 1, 1970
0
Dave Boland said:
I'm doing some software that will measure speed of rotation and
direction (quadrature). Early hardware not selected, and of course not
available yet. So does anyone know where I can find an inexpensive d.c.
motor that has a tacho with signals for speed and quadrature? I've
looked at Radio Shack, Edmund's, and two robotic web sites so far.
Spec's:

Speed: Don't care
Torque: Don't care
Size: Don't care
Shaft size: Don't care as long as it will easily connect to tacho
Voltage: 0 to 5 if possible
Current: Low current so can run on D cells
Cost: Very low since this is a throw-away part.

I can't think of anything else to specify. The motor will be driven
using PWM most likely, but a buffered DAC can also be used.

Thanks for any help.

Dave,
New, no.
However second hand, possibly. In the UK, Distel, has some motors like
this at times, and similar suppliers in other countries may be able to
help. However Distel's prices on these, have shot up recently, since they
are fashionable for 'robotics'. Have you considered the 'silly' solution,
of taking RC servos apart?. Remove the electronics, potentiometer, and end
stops, and you have a lovely cheap geared motor, designed to give good
torque off 5v. You can also add the tacho pickup, where the potentiometer
normally sits. Some of the Chinese units, sold for real 'bargain' models,
are unbelievably cheap,and plenty of people have gone this route:
http://www.andrew-w.co.uk/?c=4&p=7

Best Wishes
 
A

Andrew Tweddle

Jan 1, 1970
0
Dave said:
I'm doing some software that will measure speed of rotation and
direction (quadrature). Early hardware not selected, and of course not
available yet. So does anyone know where I can find an inexpensive d.c.
motor that has a tacho with signals for speed and quadrature?
<snip>

They are used in Inkjet Printers.

Andrew
 
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