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Posted by Robin on April 20, 2008, 5:37 am
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> Will this motor... work with this driver chip:
IMHO you can't make any sense of a stepper motor spec
without a speed against torque graph, stating volts and
current. If the supplier doesn't plaster it all over the
advert then it's usually fairly safe to assume it's a bit
naff. If they give you a 'holding torque' but no 'pull in
torque', you know it's a disaster.
So the qualified answer has to be, 'Yes, if your application
does not require any kind of speed'.
Steppers come in 2 flavours when you start talking speed.
Those with high impedance coils designed for constant volts
and those with low impedance coils designed for constant
current.
The problem with the constant voltage type is the high
impedance of the coil. You can't switch it very quickly so
the power falls away like a lead balloon very early on in
the speed torque curve.
The constant current type work with LOTS more volts than the
coil is rated for. Impedance is overcome by volts so they
can go much faster before you reach the lead balloon part of
the torque curve. The problem is the extra circuitry
required to control the current.
These steppers are by Portescap, but not their fabled disk
magnet technology which makes for some of the fastest
steppers in creation :o)
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