Orbray DC Brushless Motor Series for RC and Robotics - BRS/BRT 17-18

Overview

This document provides detailed technical specifications and mechanical data for the Orbray BRS/BRT 17-18 series brushless motors, designed for remote control (RC) and robotic applications. The motors include built-in Hall sensors and use sintered sleeve bearings. Reduction gears cannot be attached to these models.

Electrical Specifications

• Nominal Voltage: 7.4 V
• No Load Speed: 25,500 to 27,300 rpm
• No Load Current: 114 to 249 mA
• Stall Torque: 10.80 to 23.09 mNm
• Stall Current: 4.39 to 8.81 A
• Maximum Output Power: 7.7 to 15.4 W
• Maximum Efficiency: Approximately 69-70%
• Terminal Resistance: 0.84 to 1.69 Ω
• Friction Torque: 0.67 to 0.88 mNm
• Back-EMF Constant: 0.265 to 0.282 mV/rpm
• Torque Constant: 2.53 to 2.70 mNm/A
• Slope of Speed-Torque Curve: 1102 to 2523 rpm/mNm
• Mechanical Time Constant: 8.07 to 10.12 ms

Mechanical Data

• Shaft Axial Play: 0.03 to 0.3 mm
• Shaft Runout: ≤ 0.05 mm
• Bearing Type: Sintered sleeve bearing
• Operating Temperature Range: -10°C to +50°C
• Maximum Coil Temperature: Specified but exact value not clearly stated
• Weight: Approximately 29 grams

Pin Configuration and Signals

The motor includes 7 to 8 terminals with the following typical pin assignments:

• #1 and #7: Motor winding connections (W and V phases)
• #2: Hall sensor power supply (3.8 to 5.5 V input)
• #3: Hall sensor input signal (3.8 to 5.5 V)
• #4, #5, #8: Hall sensor output signals (U, V, W phases)

Additional Notes

• Pinion gear must be provided or specified for sample manufacturing to match shaft diameter.
• Reduction gears cannot be attached to these motor models.
• Specifications are subject to change without notice.

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]