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3. Key Technical Specifications
- Frame size: NEMA 23 (2.25 in / 57 mm square flange)
- Motor type: 2-phase hybrid stepper
- Step angle: 1.8° (200 full steps/rev)
- Shaft configuration: Double shaft (front + rear)
- Lead wires: 8 (flying leads, no connector)
- Typical connection options: Bipolar series, bipolar parallel, or unipolar
- Insulation class: Class B (130 °C)
- Operating temperature: −20 °C to +50 °C
- Storage temperature: −40 °C to +70 °C
- Maximum radial load: 15 lb
- Maximum thrust (axial) load: 25 lb
- Shaft runout: 0.001 in T.I.R. max
- Radial play: 0.001 in max @ 1 lb load
(Exact current, resistance, inductance, and holding-torque values vary by winding revision; verify against the specific unit’s nameplate or request the test report for the serial number on hand. Many 5023-series units fall in the 1–3 A/phase range with holding torques from ~100–160 oz-in depending on connection.)
4. Product Introduction
The Applied Motion Products 5023-279D is a NEMA 23 frame, 2-phase hybrid stepper motor with a double shaft. It delivers precise incremental motion for positioning, indexing, and open-loop control in packaging machinery, lab automation, CNC axes, and conveyor indexing systems.
Engineers choose this unit when a compact, industry-standard 2.25-inch flange and dual-shaft output are required for encoder or hand-wheel mounting on one end while driving a load on the other. The 8-lead configuration allows series, parallel, or unipolar wiring to match available drive current and voltage.
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Motor does not step / no torque | Drive current not set or phase wires open | ✅ High | Measure resistance phase-to-phase with multimeter; confirm drive current matches motor rating | Verify wiring and set drive current; replace motor only if winding open or shorted |
| Excessive heat / thermal trip | Over-current or continuous full current without idle reduction | ✅ Medium | Feel motor case after 10–15 min run; check drive idle-current setting | Reduce run current or enable idle reduction; confirm heat sink / airflow |
| Lost steps / position error | Load inertia too high or acceleration too aggressive | ❌ Low (system) | Calculate load inertia vs motor rotor inertia; reduce accel ramp | Resize motor or add gearhead; not a motor fault |
| Shaft binds or high detent torque | Bearing damage or debris | ✅ High | Rotate shaft by hand with power off; feel for roughness | Replace motor if binding present |
| One phase weak / uneven steps | Open or high-resistance winding | ✅ High | Compare resistance of all phases; should be matched | Replace if imbalance >10 % |
| Vibration / resonance at certain speeds | Mid-band resonance | ❌ Low (application) | Change microstep resolution or add damper | Adjust drive settings first |
If the motor still fails after the above checks, capture photos of the nameplate, lead colors, and drive settings, then contact technical support with the serial number and test data.
5023-279D
6. Frequently Asked Questions (FAQ)
Q: Is the 5023-279D a double-shaft motor? A: Yes. The “D” suffix indicates front and rear shafts. Use the rear shaft for an encoder, brake, or manual adjustment knob.
Q: Can I hot-swap this motor? A: No. Power down the drive, wait for bus voltage to decay, then disconnect. Hot-swapping can damage the drive output stage or the motor windings.
Q: What is the exact holding torque and current rating? A: These values depend on the specific winding revision and connection (series vs parallel). Measure the phase resistance on your unit and match it to the drive current setting. Request the factory test report for the serial number if you need certified numbers.
Q: Is this motor still in production? A: The 5023 series includes several obsolete or limited-stock windings. The 5023-279D is typically available as new surplus or remaining OEM stock. Confirm current availability and lead time before ordering large quantities.
Q: What drive is compatible? A: Any bipolar or unipolar stepper drive that can supply the required phase current and voltage. Match the drive’s current setting to the motor’s rated current for the chosen connection. Applied Motion Si, ST, and SV series drives are commonly used with this frame size.
Q: Why is the price lower than a brand-new HT23 series motor? A: This is new surplus / remaining stock of an older 5023-series winding. It is electrically and mechanically functional but may not carry the latest production firmware or packaging updates of current catalog motors.
Q: Do I need to reprogram anything when replacing an identical unit? A: No. This is a passive motor. Simply match the wiring configuration and drive current setting to the original installation. Take a photo of the old motor’s lead connections before removal.
