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Posted by pogo on April 2, 2008, 8:02 pm
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This ought to be good for some laughs from a few of you, but I am serious in
asking the question:
Is there a way to wire up standard stepper (4, 5, or 6 wire) motors so they can
be driven forward/backward like a "normal" DC
motor without a stepper-specific driver ? My nebulous goal in asking this is to
minimize the number of gizmos in my junk box for
building bots: having one kind of motors that can be used 2 different ways - by
upgrading the electronics to drive them later.
Thanks for any help ... and enjoy the chuckles ! :-)
JCDeen
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Posted by on April 2, 2008, 8:13 pm
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On Apr 2, 5:02=A0pm, "pogo"
> This ought to be good for some laughs from a few of you, but I am serious =
in asking the question:
>
> Is there a way to wire up standard stepper (4, 5, or 6 wire) motors so the=
y can be driven forward/backward like a "normal" DC
> motor without a stepper-specific driver ?
Noway...
You can wire them up as steppers with drivers, and have 2 inputs:
1-direction (0=3Dfd, 1=3Dbk)
2-on/off
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Posted by BobH on April 2, 2008, 8:54 pm
Please log in for more thread options pogo wrote:
> Is there a way to wire up standard stepper (4, 5, or 6 wire) motors so
> they can be driven forward/backward like a "normal" DC motor without a
> stepper-specific driver ? My nebulous goal in asking this is to minimize
> the number of gizmos in my junk box for building bots: having one kind
> of motors that can be used 2 different ways - by upgrading the
> electronics to drive them later.
Not with DC. You can use a step clock source (like a 555) feeding a
driver of some sort and wind up with something that does not require a
processor to run, but the driver board is not optional with DC on a step
motor.
You might and that is a definite maybe, get a step motor to run on AC
with a transformer and a capacitor or two, but it would be fixed speed
(slow), very quirky and probably take a good bit of fooling with.
With a DC motor, a processor, driver and a shaft position encoder, you
can make them behave a little like a step motor, in that you can direct
them to a specific position. Generally they are better than steppers for
motion control.
Good Luck,
Bob
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Posted by pogo on April 3, 2008, 3:30 am
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> pogo wrote:
>> Is there a way to wire up standard stepper (4, 5, or 6 wire) motors so
>> they can be driven forward/backward like a "normal" DC motor without a
>> stepper-specific driver ? My nebulous goal in asking this is to minimize
>> the number of gizmos in my junk box for building bots: having one kind
>> of motors that can be used 2 different ways - by upgrading the
>> electronics to drive them later.
>
> Not with DC. You can use a step clock source (like a 555) feeding a
> driver of some sort and wind up with something that does not require a
> processor to run, but the driver board is not optional with DC on a step
> motor.
>
> You might and that is a definite maybe, get a step motor to run on AC
> with a transformer and a capacitor or two, but it would be fixed speed
> (slow), very quirky and probably take a good bit of fooling with.
>
> With a DC motor, a processor, driver and a shaft position encoder, you
> can make them behave a little like a step motor, in that you can direct
> them to a specific position. Generally they are better than steppers for
> motion control.
>
> Good Luck,
> Bob
Yeah sounds like more trouble than its worth -- which is what I suspected. But
still interesting to think about ...
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Posted by on April 3, 2008, 11:05 am
Please log in for more thread options On Thu, 3 Apr 2008, pogo wrote:
>> pogo wrote:
>>> Is there a way to wire up standard stepper (4, 5, or 6 wire) motors so
>>> they can be driven forward/backward like a "normal" DC motor without a
>>> stepper-specific driver ? My nebulous goal in asking this is to minimize
>>> the number of gizmos in my junk box for building bots: having one kind of
>>> motors that can be used 2 different ways - by upgrading the electronics to
>>> drive them later.
>>
>> Not with DC. You can use a step clock source (like a 555) feeding a driver
>> of some sort and wind up with something that does not require a processor
>> to run, but the driver board is not optional with DC on a step motor.
>>
>> You might and that is a definite maybe, get a step motor to run on AC with
>> a transformer and a capacitor or two, but it would be fixed speed (slow),
>> very quirky and probably take a good bit of fooling with.
>>
>> With a DC motor, a processor, driver and a shaft position encoder, you can
>> make them behave a little like a step motor, in that you can direct them to
>> a specific position. Generally they are better than steppers for motion
>> control.
>>
>> Good Luck,
>> Bob
>
> Yeah sounds like more trouble than its worth -- which is what I suspected.
> But still interesting to think about ...
>
Actually, during the sporge attack, I posted to Gordon's blog site about
wanting to drive a hard drive BLDC spindle motor, a similar problem to
what you propose if I'm not mistaken, and was actively encouraged to drop
the idea, as being not worth the effort.
Still, I'd love to obtain a small and simple circuit which could spin
those babies under s/w control 8-).
Cheers,
Rob.
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