Re: Microstepping thru the Tulips

Point (3): That's the reason why our sine-cosine reference morphs
into a quadrature (full-step) reference starting at 3 revs/sec and
finishing at 6 revs/second. Above 4-6 reves per second the motor is
being driven by a full-step sequence.

Torque is an "area under the curve" thing. A sine function (0 to 180
degrees) has pi/4 area compared to a squarewave (0 to 180 degrees).

Doing so extracts the maximum possible power from the motor.

Mariss



--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Graham Stabler" <eexgs@...>
wrote:

>
>
> Here is my point list:
>
> 1) at high RPM it is difficult for the rotation of a body to be
> anything but smooth so the micro stepping at that point is not so
> important.
>
> 2) Positionally the microsteps make no difference at high speed as

you

> can't stop the motor instantly, rather you ramp the speed down and

at

> the point the microsteps are useful, so you see the smoothness in

the

> acceleration/decelleration phase. As all moves contain one of each

I

> would say that microstepping is a good thing.
>
> 3) I gather there is less torque in a microstep then in a half or

full

> step so I assume that lost microsteps are a given but they still aid
> motion.
>
> Graham
>