Orbray BMS Brushless Motor Series Overview

The document provides detailed technical specifications and mechanical data for the Orbray BMS16-30 series brushless motors equipped with Hall sensors and sleeve bearings. It includes performance parameters, electrical characteristics, mechanical limits, and connection information.

1. Motor Specifications

• Nominal Voltage: Available in 7.4V, 12.0V, and 24.0V variants.
• No Load Speed: Ranges from 14,500 to 16,600 rpm depending on model.
• No Load Current: Between 41 mA and 123 mA.
• Stall Torque: From 25.10 mNm to 35.33 mNm.
• Stall Current: High currents at stall, ranging from 2,410 mA to 5,390 mA.
• Output Power: Maximum output power between 9.5 W and 15.4 W.
• Maximum Efficiency: Up to 76% efficiency.
• Terminal Resistance: Varies from 1.37 Ω to 9.97 Ω.
• Rated Torque and Speed: Rated torque around 3.26 to 3.90 mNm and rated speed between 12,600 and 14,800 rpm.
• Rated Current: Between 311 mA and 807 mA.
• Friction Torque: Consistent at 0.58 mNm.
• Back-EMF Constant: From 0.499 to 1.497 mV/rpm.
• Torque Constant: Between 4.77 and 14.30 mNm/A.
• Slope of N-T Curve: Approximately 466 to 577 rpm/mNm.
• Mechanical Time Constant: Around 2.87 to 3.56 ms.
• Rotor Inertia: 0.59 g·cm².
• Maximum Allowable Torque: From 12.55 mNm to 17.67 mNm.

2. Mechanical Data and Bearings

• The motors use sleeve bearings as standard; ball bearings are available as an option, which may slightly alter dimensions.
• Dimensions are provided in millimeters.
• Maximum shaft radial and axial loads are specified but exact values are not clearly stated in the document.
• Operating temperature range is from 0°C to 80°C.
• Maximum coil temperature and weight are noted, with the motor weight approximately 36 grams.

3. Electrical Connections and Sensors

• Motors include built-in Hall sensors for rotor position detection.
• Input voltage for Hall sensors is 3.0V (range 1.6V to 5.5V).
• Hall sensor outputs are provided on three lines: U, V, and W.
• Connection specifications and wiring details are referenced on pages 73 and 74 (not included in this document).

4. Performance Graphs and Notes

• Graphs illustrate speed and current versus torque for the three voltage variants (7.4V, 12V, 24V).
• Speed decreases and current increases with increasing torque, as expected.
• Specifications are subject to change without notice.

5. Manufacturer Information

• Orbray Co. Ltd., Tokyo, Japan.
• Contact details include telephone numbers, website URLs, and email addresses for sales inquiries.

Critical Information and Recommendations

• When opting for ball bearings, verify dimensional changes to ensure compatibility.
• Ensure operating conditions remain within specified temperature and voltage ranges to maintain motor performance and longevity.
• Use the Hall sensor outputs for precise motor control and feedback.
• Refer to the detailed connection specifications on the indicated pages for proper wiring.