This document provides specifications for the L281 stepping motor, including a step angle of 1.8 degrees, maximum voltage of 90V, and holding torques of 116Ncm for unipolar and 150Ncm for bipolar drives. It also lists terminal connections for unipolar, bipolar series, and bipolar parallel drives.

1. Stepping Motor
L281 Technical
Information
Specification L281
Step Angle 1.8º
Step Angle Accuracy 5
Phase Current A 1.7
Phase resistance Ω 1.8
Phase Inductance mH 5.3
Holding Torque Unipolar Ncm 116
Holding Torque Bipolar Ncm 150
Detent Torque Ncm 12
Rotor Inertia g-cm2 640
Maximum Voltage V 90
Insulation Class B
Shaft Configuration Single
Number of Leads 8
Length 500mm
Mass Kg 1.3
Astrosyn International Technology Ltd
The old Courthouse, New Road Avenue, Chatham, Kent ME4 6BE, England
Telephone: ++44 (0) 1634 815175 Fax: +44 (0) 1634 826552
Email: Astrosyn@btinternet.com Website: http//www.astrosyn.com
Registered office: Montague Place, Quayside, Chatham Maritime, Kent, ME4 4QU. Registered in England No 1188550

2. Stepping Motor
L281 Technical
Information
Curve Shown with Bipolar chopper drive. Windings in Parallel. Current 2.4A/Ph
Unipolar Drive Terminal Colour
A+ 5 Orange
A- 6 Black
A common 1&3 White/Black & White/Orange
B+ 7 Yellow
B- 8 Red
B common 2&4 White/Yellow & White/Red
Bipolar Drive - Series Terminal Colour
A+ 5 Orange
A- 6 Black
B+ 7 Yellow
B- 8 Red
Link & Isolate 1&3 White/Black & White/Orange
Link & Isolate 2&4 White/Red & White/Yellow
Bipolar Drive – Parallel Terminal Colour
A+ 1&5 White/Black & Orange
A- 3&6 White/Orange & Black
B+ 2&7 White/Red & Yellow
B- 4&8 White/Yellow & Red
Astrosyn International Technology Ltd
The old Courthouse, New Road Avenue, Chatham, Kent ME4 6BE, England
Telephone: ++44 (0) 1634 815175 Fax: +44 (0) 1634 826552
Email: Astrosyn@btinternet.com Website: http//www.astrosyn.com
Registered office: Montague Place, Quayside, Chatham Maritime, Kent, ME4 4QU. Registered in England No 1188550