Robot stepper 23H20 series

for automation

Product overview
The Size 23 (57 mm) 2-phase hybrid rotary stepper motor Series 23H provides up to 3 N·m holding torque. Encoders, 57 mm-frame planetary gearboxes and power‑off brakes are available as options.

General
Step angle: 1.8° ±5%
Resistance: ±10% @ 20 °C
Inductance: ±20% @ 1 kHz
Insulation class: B
Duty type: S1
Dielectric strength: 500 VAC / 1 kHz / 1 mA / 1 s
Insulation resistance: 100 MΩ / 500 VDC
Permissible radial load (5 mm from mounting surface): 180 N
Permissible radial load (10 mm from mounting surface): 130 N
Permissible radial load (15 mm from mounting surface): 100 N
Permissible radial load (20 mm from mounting surface): 90 N

Electrical & mechanical parameters (by type)
Type 23H2042 — Current (A [RMS]): 1.0 | Resistance (Ω): 4.2 | Inductance (mH): 9 | Holding Torque (N·m): 0.6 | Rotor Inertia (g·cm²): 140 | Length (mm): 41 | Mass (g): 460
Type 23H2045 — Current: 1.0 | Resistance: 4.5 | Inductance: 12 | Holding Torque: 0.8 | Rotor Inertia: 180 | Length: 44 | Mass: 520
Type 23H2051 — Current: 2.0 | Resistance: 1.5 | Inductance: 4.4 | Holding Torque: 1.0 | Rotor Inertia: 240 | Length: 51 | Mass: 640
Type 23H2055 — Current: 2.0 | Resistance: 1.6 | Inductance: 5.2 | Holding Torque: 1.2 | Rotor Inertia: 280 | Length: 54 | Mass: 720
Type 23H2065 — Current: 3.0 | Resistance: 0.9 | Inductance: 2.7 | Holding Torque: 1.6 | Rotor Inertia: 350 | Length: 64 | Mass: 860
Type 23H2076 — Current: 4.0 | Resistance: 0.6 | Inductance: 2.4 | Holding Torque: 2.0 | Rotor Inertia: 480 | Length: 75 | Mass: 1060
Type 23H2100 — Current: 5.0 | Resistance: 0.46 | Inductance: 2.3 | Holding Torque: 3.0 | Rotor Inertia: 720 | Length: 100 | Mass: 1500

Material
End bell: Aluminum alloy
Bearing: Deep groove ball bearing
Magnet: Sintered NdFeB
Shaft: Stainless steel
Wiring: UL 3265, 20/22 AWG

Dimensional drawing
Dimensional drawing available for Size 23 (57 mm) frame (57 mm overall frame / Size 23 family).

Torque performance curves
Torque/speed curves and performance charts available for variants: 23H2042-100, 23H2045-100, 23H2051-200, 23H2055-200, 23H2065-300, 23H2076-400, 23H2100-500.

Options — Encoder
Resolution (CPR) available: 50, 100, 192, 200, 250, 256, 360, 400, 500, 720, 900, 1000, 1250, 2000, 2500, 4000, 5000
Single-ended output codes: 0,1,2,3,4,5,6,7,8,9,10,11,12
Differential output codes: A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q

Options — Planetary gearbox (57 mm frame)
House material: Metal
No load backlash: First stage 15 arcmin, second stage 25 arcmin
Bearing: Ball bearing
Available ratios: 5, 10, 15, 20, 25
Typical data group 1 (ratios 5,10): Rated torque 6 N·m | Limit torque 12 N·m | Stages: 1 | Efficiency: 95% | Length: 53 mm | Mass: 800 g
Typical data group 2 (ratios 15,20,25): Rated torque 25 N·m | Limit torque 40 N·m | Stages: 2 | Efficiency: 90% | Length: 70 mm | Mass: 1100 g

Options — Power-off brake (available for Size 23 motor)
Rated voltage: DC 24V ±5%
Resistance: 141 Ω ±10%
Power: 5 W
Hold torque: > 2 N·m
Insulation class: B
Insulation resistance: > 100 MΩ (DC 500V)
Dielectric strength: AC 1000V for 1 s
Retraction time: 50 ms
Release time: 50 ms
Gyration gap: 1°
Emergency brake cycle: 200 cycles
Lifetime: 500,000 cycles
Noise level: < 60 dB

Features / technical specifications

• Product type: 2-phase hybrid rotary stepper motor, Series 23H
• Maximum holding torque for Size 23 (57 mm): up to 3 N·m depending on model
• Step angle: 1.8° ±5%
• Current range by model: 1.0 A to 5.0 A (RMS)
• Available options: encoder (multiple resolutions), 57 mm planetary gearbox (various ratios), power‑off brake
• Materials: aluminum alloy end bell, sintered NdFeB magnet, stainless steel shaft
• Typical applications: industrial motion control, robotics, automation where compact 57 mm frame is required