Orbray BMS Brushless Motor Series BMS12-15 - Technical Summary

1. Overview

The Orbray BMS12-15 series are brushless motors equipped with Hall sensors and sleeve bearings. These motors are designed for high-speed applications with precise control enabled by integrated Hall sensors.

2. Electrical Specifications

• Nominal Voltage: Models available at 7.4V and 12.0V.
• No Load Speed: Ranges from approximately 26,200 to 40,000 rpm depending on model.
• No Load Current: Between 82 mA and 113 mA.
• Stall Torque: Approximately 5.73 to 6.33 mNm.
• Stall Current: Around 1,877 to 2,350 mA.
• Output Power: 3.9 to 5.2 W.
• Maximum Efficiency: Approximately 61% to 63%.
• Terminal Resistance: 3.15 to 6.39 ohms.
• Rated Torque: 1.05 to 1.10 mNm.
• Rated Speed: 21,461 to 25,683 rpm.
• Rated Current: 394 to 523 mA.
• Friction Torque: 0.29 mNm.
• Back-EMF Constant: 0.268 to 0.369 mV/rpm.
• Torque Constant: 2.56 to 3.52 mNm/A.
• Slope of N-T Curve: 4,590 to 4,915 rpm/mNm.
• Mechanical Time Constant: 4.26 to 4.56 ms.
• Rotor Inertia: 0.09 gcm².
• Maximum Torque: 2.86 to 3.16 mNm.

3. Mechanical Specifications

• Shaft Radial Play: 0.015 mm.
• Shaft Axial Play: 0.23 mm.
• Maximum Shaft Radial Load: 0.5 N (measured at 3.9 mm from flange).
• Maximum Shaft Axial Load: 0.15 N.
• Maximum Shaft Axial Load at Standstill: 7.8 N.
• Operating Temperature Range: -20°C to 80°C.
• Maximum Coil Temperature: 90°C.
• Weight: 8.8 grams.

4. Electrical Connections

• Motor windings labeled U, V, W.
• Input voltage range: 1.6V to 5.5V (typical 3.0V).
• Hall sensor outputs for U, V, W phases available only on models with Hall sensors.
• Pin assignments include Vdd, GND, and Hall sensor outputs.

5. Additional Information

• Dimensions and compatibility with gear, encoder, and driver modules are specified (e.g., ISPG12/SSG12 gear, ETD12 encoder, ISHSD24H01A driver).
• Connection specifications for gear integration are referenced on pages 67 and 68 (not included here).
• Specifications are subject to change without notice.

6. Manufacturer Contact

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 BMS12-15 series brushless motors offer high-speed operation with integrated Hall sensors for precise control, suitable for applications requiring compact size, low weight, and reliable performance. Key parameters such as torque, speed, current, and mechanical tolerances are well-defined to ensure optimal integration and operation.