See this faq for a nice writeup on using unipolar and bipolar stepper motors.
SCM-E040:
SCM-E040 is a takeout from an (Epson?) printer. It is a 6 wire, 2 phase Unipolar motor. The leads have 100 ohms between A and C (yellow and blue), and 100 ohms between B and D (white and red). I’m assuming the coil will handle atleast 500mA, so that means 10V should be ok per coil, given the 100ohm resistance?
To use with the A4988 stepper, leave the center tap (green) wires unconnected. Minimal wiring diagram for connecting a microcontroller to an A4988 stepper motor driver carrier (full-step mode).
Wantai 42BYGHM809:
- Step Angle: 0.9 deg
- Rated Voltage: 2.8V
- Rated Current: 1.7A / Phase
- Phase Resistance: 1.65 ohm
- Phase Inductance: 4 mH
- Holding Torque: 4200 g.cm (48 N.cm)
- Rotor Inertia: 68 g.cm2
- Detent Torque: 220 g.cm
- Motor Weight: 0.34 kg
- 5mm Diameter Drive Shaft
- NEMA 17 form factor
Got this from Sparkfun.
Howard Industries 1-19-4201:
- Type: 2 Phase Bi-Polar 5 lead
- Class: NEMA 17, 24V, 3.6 Deg.
- Coil : 24V/.16A/140ohm/68mH
- Holding torque: 600gm/cm
- Shaft: 3/16" dia. X 7/16"
Connections:
| step | red | brown | white | green |
|---|---|---|---|---|
| 1 | - | - | ||
| 2 | - | - | ||
| 3 | - | - | ||
| 4 | - | - |
Sources: All Electronics, MPJA
12V Right angle worm drive motor
Got from All Electronics. Also, matching available with drive on opposite side.
- No-load rating: 180 RPM @ 12Vdc / 1.3A.
- 12mm diameter worm shaft is 89mm (3.55") long.
- last 12mm of the shaft has a 6 x 1.0 reverse metric thread.
- Heavy gauge U-bracket on back of gearhead, 1/4" holes with 7mm spacing.
- 3/16" quick-connect terminals.
- Designed for power seat adjustment in automobiles.
- Also available with worm gear in opposite direction,
- "... 1/2-8 ACME nut works on this worm screw. It's a little sloppy because the diameter is under sized. It's definitely not a M12 x 3mm metric nut..."
NMB steppers
| PM35S-048 | PM35L-048 | PM35L-048 | |
|---|---|---|---|
| Step Angle | 7.50 deg | 7.50 deg | 7.50 deg |
| Frame Size | 35 mm | 35 mm | 35 mm |
| Max Holding Torque | 20 mNm | 45 mNm | 45 mNm |
| Steps per Rotation | 48 | 48 | 48 |
| Drive Circuit | Unipolar | Unipolar | Bipolar |
| Drive Voltage | 24 V | 24 V | 24 V |
| Coil Resistance per Phase | 50 Ohms | 30 Ohms | 6 Ohms |
Mitsumi steppers
M42SP-7 Rated Voltage DC 12V DC 24V Working Voltage DC 10.8~13.2V DC 21.6~26.4V Rated Current/Phase 259mA 173mA No. of Phase 4 Phase 4 Phase Coil DC Resistance 50Ω/phase±7% 150Ω/phase±7% Step Angle 7.5˚/step 7.5˚/step Excitation Method 2-2 Phase excitation (Unipolar driving) Insulation Class Class E insulation Class E insulation Holding Torque 49.0mN·m 52.9mN·m Pull-out Torque 23.5mN·m/200pps 33.3mN·m/200pps Pull-in Torque 19.6mN·m/200pps 29.4mN·m/200pps Max. Pull-out Pulse Rate 600pps 650pps Max. Pull-in Pulse Rate 420pps 430pps M35SP-5 Rated Voltage DC 12V DC 24V Working Voltage DC 10.8~13.2V DC 21.6~26.4V Rated Current/Phase 259mA 173mA No. of Phase 4 Phase 4 Phase Coil DC Resistance 50Ω/phase±7% 150Ω/phase±7% Step Angle 7.5˚/step 7.5˚/step Excitation Method 2-2 Phase excitation (Unipolar driving) Insulation Class Class E insulation Class E insulation Holding Torque 34.3mN·m 38.2mN·m Pull-out Torque 21.6mN·m/200pps 24.0mN·m/200pps Pull-in Torque 21.1mN·m/200pps 23.5mN·m/200pps Max. Pull-out Pulse Rate 610pps 675pps Max. Pull-in Pulse Rate 600pps 645pps M35SP-8 Rated Voltage DC 12V DC 24V Working Voltage DC 10.8~13.2V DC 21.6~26.4V Rated Current/Phase 259mA 173mA No. of Phase 4 Phase 4 Phase Coil DC Resistance 50Ω/phase±7% 150Ω/phase±7% Step Angle 7.5˚/step 7.5˚/step Excitation Method 2-2 Phase excitation (Unipolar driving) Insulation Class Class E insulation Class E insulation Holding Torque 38.2mN·m 42.1mN·m Pull-out Torque 23.0mN·m/200pps 28.4mN·m/200pps Pull-in Torque 22.5mN·m/200pps 27.9mN·m/200pps Max. Pull-out Pulse Rate 580pps 610pps Max. Pull-in Pulse Rate 495pps 520pps
