www.wimb.net - Stepper Drive Information
Unipolar Drive
The unipolar drive has a very simple construction.
The basic construction at the right consists of four switches - each switch controls one winding of the stepper motor.
By controlling the switches in the correct order, the motor will step from one position to another.
Stepping Modes
There are three basic operating modes for the switching sequences.
- Full Step - One Winding On
- Full Step - Two Windings On
- Half Step
| Seq. | Name | Remark |
|---|---|---|
| 0001
0010 0100 1000 |
Full Step - One Winding On | Consumes the least power. Only one phase is energized at a time. Assures positional accuracy regardless of any winding imbalance in the motor. |
| 0011
0110 1100 1001 |
Full Step - Two Windings On | Hi Torque - This sequence energizes two adjacent phases, which offers an improved torque-speed product and greater holding torque. |
| 0001
0011 0010 0110 0100 1100 1000 1001 |
Half Step | Half Step - Effectively doubles the stepping resolution of the motor, but the torque is not uniform for each step. (Since we are effectively switching between Wave Drive and Hi-Torque with each step, torque alternates each step.) This sequence reduces motor resonance which can sometimes cause a motor to stall at a particular resonant frequency. Note that this sequence is 8 steps. |
PID: 4060 CLT: 0.004 LMD: 2008-Oct-15
Updated 2007 Oct. 09
