Stepper Motors

Stepper Motors

The original floppy disk drive for IBM-PCs and compatibles was the Tandon TM100. When we scrapped a lot of old IBM-PCs, I kept the disk drives to see if I could make use of any of the components. Of particular interest to me were the stepper motors.

 KP4M4-001 Stepper Motor

These were made by a number of companies including

They all have the same specs: +12v dc, four-phase, unipolar, 3.6° per step.

With the arrival of PC clones and half-height drives, lots of other stepper motors came into use.

There are various ways to get these motors going, controlled via the digital outputs of a PC's Parallel Printer Port or with a microcontroller such as the PIC or BASIC Stamp


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last updated: 22-Aug-06 Ian Harries <>