what kind of motor has the most torque?
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Posts: 46,084
hello there.
I know that every motor is different, but I'm wondering what's the torque
comparison of a generic dc brush motor, stepper motor and servo motor.
Thanks
I know that every motor is different, but I'm wondering what's the torque
comparison of a generic dc brush motor, stepper motor and servo motor.
Thanks
Comments
Original Message
From: raoul vaneigem [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=nDfKFx1H2rxiNOzAJ6Dy5z7KRrrhC-DxsJxYckebefdJ6k6fDulHLDwlo_UATUO0l6OU30Pmng]raoul@c...[/url
Sent: Wednesday, May 01, 2002 10:52 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] what kind of motor has the most torque?
hello there.
I know that every motor is different, but I'm wondering what's the torque
comparison of a generic dc brush motor, stepper motor and servo motor.
Thanks
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Ben
Dennie Bishop <dbishop@e...> wrote: I'd guess the servo
due to the gearing.
Original Message
From: raoul vaneigem [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=1UkGRhXNmJqYNb4iV9lEtrKG2aTMdC3qQuqmnqqD-lCqs4hVIDh2ckVNOz7rxBQeWXYqN58lxw]raoul@c...[/url
Sent: Wednesday, May 01, 2002 10:52 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] what kind of motor has the most torque?
hello there.
I know that every motor is different, but I'm wondering what's the torque
comparison of a generic dc brush motor, stepper motor and servo motor.
Thanks
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BEN (TEAM DBR)
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[noparse][[/noparse]Non-text portions of this message have been removed]
If we assume the magnets, armature, and voltage/current is the same. Then
all three would be about equal. They are all electric motors of one type or
another.
Now if we add a gear set to a motor to gear it down, then we can increase
it's torque output but at the expense of lower RPM's out the output shaft.
A DC motor is designed to turn in one direction well, and deliver maximum
performance at a certain voltage and RPM. But on more generic ones that
don't turn really high RPM's you can run them forward and backwards quite
well by reversing the voltage on the motor. High RPM motors typically have
the commutator timed so that they can run their best in one direction. AC
motors have a similar timing relationship as well, otherwise they might
startup and run backwards, which might be bad if it is a airconditioner
motor or something.
A Stepper motor is designed to "step" once for every pulse train sequence
that is applied to it (some motors can do 1/8, 1/4, 1/2 steps too). They can
arrange the coils and magnets so that the motor can have larger or smaller
or even micro steps.
The stepper works well for more precise control over positioning and knowing
where you are. For example, 100 pulse or 100 steps out, and 50 steps back,
and you know your still 50 steps out from the start. Plus you can get
precise control over RPM's too, thus steppers work well in some devices like
hard disk drivers and printers, etc.
A real servo motor has a complementary but smaller motor feedback unit
hooked up to it, if the feedback motor unit turns, the big servo motor turns
to match the smaller one. You can remove the feedback motor and replace it
with a electronic feedback unit to simulate the movements as well. The servo
motor gets it's advantage from the fact that a little itty bitty feedback
motor can drive a huge monster servo motor (they do use amplifiers here
too).
The little R/C hobby servo units you see all over are actually a little DC
motor geared way down to increase torque at the output. They use a little IC
chip and a little H-bridge driver circuit to control the motor so they can
run it forward and backwards. There is a little feedback potentiometer that
tells the IC chip how far the motor has moved the output shaft. When they
apply a PWM signal to the input line, a 1.0 ms pulse is full travel one
direction, a 2.0 ms pulse is full travel the other way, a 1.5ms pulse is the
center position. The IC chip will power the motor until the feedback pot
returns a commensurate result and then it stops.
As for power, it's all relative to what you want to do.
For example: the Space needle restaurants usually have a rotating top
portion.
They typically use a little 1/2 to 1 hp AC motor, geared way down, to
provide the rotating power.
Original Message
From: raoul vaneigem [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=FLmPawWmor-kBqvN5x1qalynPL_ERppPbI2fvkn7-1DueB0t5KxslOwwOoS0QjTRD9AVROf_iiKdghs]raoul@c...[/url
Sent: Wednesday, May 01, 2002 10:52 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] what kind of motor has the most torque?
hello there.
I know that every motor is different, but I'm wondering what's the torque
comparison of a generic dc brush motor, stepper motor and servo motor.
Thanks
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[noparse][[/noparse]Non-text portions of this message have been removed]
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automotive starter motor.
DC Compound or parallel winding motors are next also called universal
motors
Then we have have three phase motors
Servo motor does not indicate the type of motor, it indicates the power
arrangement to the motor.
Seems like this is correct, now that a statement has been made, I am
sure someone will correct it :-))))))))))))
I am talking here of startup torque and not running torque, because once
it gets going all bets are off because of RPM ranges and a bunch of
other factors,
HTH,
Leroy
> hello there.
>
> I know that every motor is different, but I'm wondering what's the
torque
> comparison of a generic dc brush motor, stepper motor and servo
motor.
>
> Thanks
Of the three types indicated I would have to say the DC brush motor
will give the most torque. Particularly if you have the variety that
has an electromagnetic field instead of permanent magnets. If you
then wire the field in series with the armature you have the very
powerful series motor, like the starter motor in your car. Under a
heavy load, as armature speed decreases the magnetic fields increase
and so does the the torque. In theory, if these motors are allowed
to run without a load they will overspeed to the point of self
destruction.