Orbray DC Coreless Motor Series CMS16-33 Overview

This document provides detailed technical specifications and mechanical data for the Orbray DC Coreless Motor Series CMS16-33, which features precious metal commutation and sleeve bearing technology.

1. Motor Specifications

• Nominal Voltage: Available in 7.4 V, 12.0 V, and 24.0 V variants (CMS16-3302, CMS16-3306, CMS16-3317 respectively).
• No Load Speed: Ranges from 9,900 to 11,600 rpm depending on voltage.
• No Load Current: Between 6 mA and 17 mA.
• Stall Torque: Approximately 24.66 to 28.09 mNm.
• Stall Current: From 1,432 mA to 3,761 mA.
• Output Power: Between 6.4 W and 8.5 W.
• Maximum Efficiency: Around 87-88%.
• Terminal Resistance: Varies from 1.97 Ω to 16.76 Ω.
• Rated Torque and Speed: Rated torque ranges from 1.576 to 1.690 mNm, with rated speeds between 9,300 and 10,900 rpm.
• Rated Current: Between 92 mA and 250 mA.
• Friction Torque: Consistent at 0.12 mNm.
• Back-EMF Constant: From 0.731 to 2.063 mV/rpm.
• Torque Constant: Between 6.98 and 19.70 mNm/A.
• Slope of N-T Curve: Approximately 386 to 412 rpm/mNm.
• Mechanical Time Constant: 4.4 ms for all variants.
• Rotor Inertia: Around 1.02 to 1.10 g·cm².
• Maximum Torque: Between 8.22 and 9.36 mNm.

2. Mechanical Data

• Shaft Radial Play: 0.05 mm.
• Shaft Axial Play: Not explicitly specified but implied minimal.
• Maximum Shaft Radial Load: 1.2 N at 5 mm from flange.
• Maximum Shaft Axial Load: 0.2 N during operation, 9.8 N at standstill.
• Weight: Approximately 37.7 grams.
• Bearing Type: Sintered sleeve bearing.

3. Environmental and Operational Conditions

• Operating Temperature: Not explicitly stated; maximum coil temperature is indicated but value not provided.
• Number of Segments: Not specified in detail.

4. Additional Notes

• Dimensions are provided in millimeters with tolerances (e.g., +0.3 mm).
• Gear and encoder options are referenced (SPG16/SSG15 gears and ETD16 encoder), with further details on pages 46 and 47 (not included here).
• Specifications are subject to change without notice.
• Contact information for Orbray Co., Ltd. is provided for further inquiries.

5. Summary of Performance Curves

Graphs (not included) illustrate speed and current characteristics versus torque for the three voltage variants, showing typical motor behavior such as decreasing speed with increasing torque and corresponding current increases.

Critical Information and Best Practices

• Ensure operating within specified voltage and current limits to avoid damage.
• Observe maximum shaft load limits to maintain bearing and motor integrity.
• Refer to detailed gear and encoder specifications for integration.
• Monitor coil temperature to prevent overheating.