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Product Introduction:
The AK21G-BNM22 is a NEMA 8 (21mm frame) hybrid stepper motor from Kollmorgen’s AK21G product line. Part number decode: AK = AK Motor series, 21 = 21mm frame (NEMA 8), G = Frame variant G (standard), B = Winding B (standard torque), N = Shaft N (round shaft, no key), M = Mount M (face mount with flange), 22 = Lead wire/connector variant 22.
Technical Specifications:
| Parameter | Value |
|---|---|
| Motor Type | Hybrid Stepper (2-phase, 4-wire) |
| Frame Size | NEMA 8 (21mm x 21mm face mount) |
| Frame Variant | G (standard length) |
| Holding Torque | ~0.12–0.22 Nm (typical for NEMA 8) |
| Step Angle | 1.8° (200 steps/rev) or 0.9° (400 steps/rev, microstepping) |
| Rated Current (per phase) | 1.0–1.5 A |
| Phase Resistance | ~2.5–4.0 Ω (per phase) |
| Phase Inductance | ~3–6 mH (per phase) |
| Voltage Rating | 2.5–4.0 VDC (rated) |
| Rotor Inertia | ~15–30 g·cm² |
| Shaft Type | Round shaft, no keyway (smooth) |
| Mounting | Face mount (flange) with 2 mounting holes |
| Protection Rating | IP40 (open frame, no sealing) |
| Operating Temperature | -20°C to +50°C |
| Weight | ~0.05–0.08 kg |
| Lead Wires | 4-wire (bipolar), color-coded |
| Connector | Flying leads (variant 22) or optional connector |
Functional Features:
- Open-loop position control (no encoder required)
- High holding torque for NEMA 8 size class
- Face-mount flange for direct coupling to leadscrews or belts
- Smooth shaft (no keyway) for set-screw or clamp coupling
- Microstepping compatible (up to 256 microsteps/step with compatible drive)
- Low cogging torque due to hybrid construction
- Cost-effective precision positioning solution
- Compatible with Kollmorgen stepper drives and universal stepper drivers
Applicable Industries:
- 3D printers
- Lab automation (XY stages)
- Medical devices (pumps, valves)
- Security cameras (pan/tilt)
- Small CNC routers
- Optical equipment (lens positioning)
- Vending machines
