Shafts stepper 8HS20 series

for shaftsfor shaftshaft

Product Overview
The Size 8 (20 mm) hollow shaft stepping motor from DINGS delivers up to 0.02 N·m holding torque and is offered in two length/electrical variants. The hollow shaft allows through-shaft applications and integration of hollow-type encoders for compact, space-constrained systems.

Motor Characteristics
Model No. | Rated Voltage (V) | Current (A) (RMS) | Resistance (Ω) | Inductance (mH) | Holding Torque (N·m) | Detent Torque (N·m) | Motor length (mm)
8HS2028 | 2.55 | 0.5 | 5.1 | 1.5 | 0.014 | 0.002 | 28
8HS2038 | 4.4 | 0.5 | 8.8 | 2.7 | 0.020 | 0.004 | 38

Dimensional Drawing
Dimensional drawings and product images are provided for Size 8 (20 mm) to verify overall and mounting dimensions for integration.

Torque Performance Curves
TEST CONDITION: Measured at 24 VDC using DS-OLS8-FRS4 bipolar chopper drive at rated current (RMS). Torque varies with supply voltage and drive settings; a design margin of 50% torque is recommended for reliable operation.

Options

• Encoder option EK1 available with multiple resolutions and output types.

Resolution (CPR): 100, 108, 120, 125, 128, 200, 250, 256, 300, 360, 400, 500, 512, 720, 800, 1000

Single-ended output codes: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15

Differential output letter codes: A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P

Technical specifications

• Brand: DINGS
• Product family: 8HS20 series — Hollow Shaft Stepper Motor (Size 8 / 20 mm)
• Available models: 8HS2028 (28 mm length), 8HS2038 (38 mm length)
• Maximum holding torque: up to 0.020 N·m (model dependent)
• Electrical data (8HS2028): Rated voltage 2.55 V; Current 0.5 A (RMS); Resistance 5.1 Ω; Inductance 1.5 mH
• Electrical data (8HS2038): Rated voltage 4.4 V; Current 0.5 A (RMS); Resistance 8.8 Ω; Inductance 2.7 mH
• Detent torque: 0.002 N·m (8HS2028), 0.004 N·m (8HS2038)
• Test conditions for torque curves: 24 VDC with DS-OLS8-FRS4 bipolar chopper drive at rated current
• Options: EK1 encoder — multiple resolutions, single-ended or differential outputs
• Customization: special windings, shaft modifications and hollow-shaft encoder assembly available on request