### Microstepping Data

**Microstepping of Stepper Motors**

Let's now look at what current ratios are needed to produce a particular

step angle. The Microstep angle can be graphically represented with

a Phasor Diagram. (See diagram below) The X and Y axis indicate

the current level in two respective coils A, B. A vector (ray from origin

to coordinate X,Y) shows the resultant angle and Torque (magnitude

of the vector) when some current is applied to both coils. Keep in mind

that this diagram shows the 'sub-angle' between natural whole steps

(poles) of the motors. On a typical 200 step per revolution motor this

is 1.8 degrees. The graph below is a representation of how that angle

can be further sub-divided.

http://www.stepperworld.com/Tutorials/pgMicrostepping.htm

**Microstepping Tutorial**

If the controller is designed with the capability to control the magnitude

of the current in each winding, then microstepping can be implemented.

The phase diagrams below all show different implementations of "divide

by 4" microstepping. Note that it is the phasor angle (not it's length) that

determines the microstep position.

http://www.zaber.com/wiki/Microstepping_Tutorial

Microstepping allows even smaller steps by using different currents

through the two motor windings

**Stepping Motor Physics**Microstepping allows even smaller steps by using different currents

through the two motor windings

For a two-winding variable reluctance or permanent magnet motor,

assuming nonsaturating magnetic circuits, and assuming perfectly

sinusoidal torque versus position curves for each motor winding

http://www.suc-tech.com/technology/stepcontrol2.htm

assuming nonsaturating magnetic circuits, and assuming perfectly

sinusoidal torque versus position curves for each motor winding

http://www.suc-tech.com/technology/stepcontrol2.htm

Labels: Microstepping, Stepper motor

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