Stepper Motors

[image of digits]
Stepper Motors

Sensors - Actuators - Encoders - Steppers - Switches
Pneumatics - Realworld Interfacing - Circuits - Robots

A 2-Phase (winding) Unipolar (single polarity) Stepper Schematic.

A 2-Phase (winding) Bipolar (two polarity) Stepper Schematic.

General Stepper Resources:

Stepper Motor Analysis:

Chart the resistance between every pair of terminals.
Draw a schematic beginning with the lowest resistance.
Mark the motor shaft with a pointer.
Tape the motor to a sheet of paper.
Apply a voltage across one pair of terminals.
Mark all the positions at which the shaft will stick.
Notes the terminals and polarities at those positions.
Do this for all possible terminals and polarities.
The paper should now show the complete excitation sequence and step size.

Oriental Motor Company
VEXTA, Model C4041-9012/328288-01-A
Specifications

7.2 Ohm/Phase, 4 Wire
A 2-phase, 1.8 degree, DC 5.3 volt, .75 amp stepper.
Quantity 50

Winding #1: Red, Black and Brown (center tap).
Winding #2: Green, Yellow and Orange (center tap).
To Ground: Orange and Brown.
Excitation Sequence (CW): Red, Green, Black, Yellow.

Fujitsu FDK
SMP20-2008-A
4 Wire
Specifications

Quantity 150

Clockwise 20 steps of 18 degrees
.Phase.	..Blue..	.Yellow.	...Red..	.White.
1	+	-
2			-	+
3	-	+
4			+	-

Oriental Motor Company
VEXTA, Model PK244-04AA
Specifications

24V, 120 Ohm/Phase, 6 Wire
A 2-phase, 1.8 degree, DC 0.2 amp, 125 ohm per phase.
2 available with timing belts and linear screw drives.

Winding #1: Red, Blue and White (center tap).
Winding #2: Green, Black and Yellow (center tap).
To Ground: White and Yellow.
Excitation Sequence (CW): Red, Green, Blue, Black.

Oriental Motor Company
VEXTA, Model PH266-01B
Specifications

7.4 Volt, 7.4 Ohm/Phase, 4 Wire
A 2-phase, 1.8 degree, DC 6 volt, 1.2 amp stepper.

Two, SGS-Thomson L6203 Stepper Full Bridge Driver Chips
Specifications
One, SGS-Thomson L6505 Stepper Controller Chip
Specifications for L6506

With rack and pinion slide.

Excitation Sequence CW: 1, 2, 3
Center Tap: 4 (longest lead)

Nidec Stepper from CD-ROM Drive

Unipolar, 4 Wires, 3 Windings, 6 Ohms each.
12 Steps, 30 degrees each.
Tested at 6V (1 Amp). Operate at a much lower voltage.

CW	Red	Green	Blue
Phase 1	+	-
Phase 2	+		-
Phase 3		+	-
Phase 4	-	+
Phase 5	-		+
Phase 6		-	+

STC Stepper from CD-ROM Drive

Bipolar, 3 Wires, 3 Windings, 16.6 Ohms each.
18 Steps, 20 degrees each.
Tested at 6V (360mA). Operate at a much lower voltage.

Epson Dot Matrix Printer - FX86e -

Disassembled for parts...
Print head stepper: EM-34 27X60 STH-39D150-01
Roller stepper: EM-35 EPM 4215 6X31
Timing belt
Optical and micro switches
Power supply

Vexta
PK245-03BA

Unipolar, 12.0 Volt, 0.4 Amp, 200 Step Motor.
Double shaft..

Quantity 2