Orbray DC Coreless Motor Series CMS16-23 Overview

This document provides detailed technical specifications and mechanical data for the Orbray DC Coreless Motor Series CMS16-23, featuring precious metal commutation and sleeve bearing design.

1. Electrical Specifications

• Nominal Voltage: Available in 7.4 V, 12.0 V, and 24.0 V variants.
• No Load Speed: Ranges from 14,500 rpm (7.4 V) to 16,600 rpm (24.0 V).
• No Load Current: Between 8 mA and 24 mA depending on voltage.
• Stall Torque: Approximately 8.66 to 9.67 mNm.
• Stall Current: From 643 mA to 1,849 mA.
• Maximum Output Power: Around 3.3 W to 3.9 W.
• Maximum Efficiency: Approximately 79% to 80%.
• Terminal Resistance: Varies from 4.00 Ω to 37.34 Ω.
• Rated Torque: About 0.886 to 0.942 mNm.
• Rated Speed: 13,000 rpm to 14,900 rpm.
• Rated Current: 73 mA to 209 mA.
• Friction Torque: Consistent at 0.11 mNm.
• Back-EMF Constant: 0.503 to 1.430 mV/rpm.
• Torque Constant: 4.81 to 13.65 mNm/A.
• Slope of N-T Curve: 1,602 to 1,913 rpm/mNm.
• Mechanical Time Constant: Approximately 9.3 to 9.5 ms.
• Rotor Inertia: Around 0.47 to 0.55 g·cm².
• Maximum Torque: 2.89 to 3.22 mNm.

2. Mechanical Data

• Shaft Radial Play: 0.05 mm.
• Shaft Axial Play: Between 0.03 mm and 0.2 mm.
• Maximum Shaft Radial Load: 1.2 N (measured 5 mm from flange).
• Maximum Shaft Axial Load: 0.2 N.
• Maximum Shaft Axial Load at Standstill: Not explicitly specified but implied within mechanical limits.

3. Environmental and Operational Conditions

• Operating temperature range: -20°C to 60°C.
• Weight: Approximately 22.4 g.

4. Additional Features and Notes

• Motors use precious metal brushes and sleeve bearings for enhanced performance.
• Dimensions are provided in millimeters; detailed mechanical drawings and gear/encoder options (SPG16/SSG15 gears and ETD16 encoder) are referenced on pages 42 and 43 (not included here).
• Performance curves for speed and current versus torque are included, indicating motor behavior under load.
• Specifications are subject to change without notice.

5. Manufacturer Information

Orbray Co., Ltd.
3-8-22 Shinden, Adachi-ku, Tokyo 123-8511, Japan
Tel: +81-3-5390-7620
Website: https://orbray.com/en/
Email: [email protected]

Summary

The CMS16-23 series coreless motors are designed for precision applications requiring high efficiency, low friction, and stable performance across a range of voltages. Key parameters such as torque, speed, current, and mechanical tolerances are clearly defined to assist in integration and application design. The inclusion of precious metal commutation and sleeve bearings supports durability and smooth operation.