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B4S12-21XX

Product catalog summary

Orbray BMS Brushless Motor Series B4S12-21XX - Technical Summary

1. General Overview

This document provides detailed specifications and mechanical data for the Orbray BMS Brushless Motor Series B4S12-21XX, which includes models such as B4S12-2108 and B4S12-2109. These motors feature Hall sensors and ball bearings, designed for precision applications.

2. Electrical Specifications

Nominal Voltage: 12.0 V (B4S12-2108), 15.0 V (B4S12-2109)
No Load Speed: 15,320 rpm (2108), 19,300 rpm (2109)
No Load Current: 55 mA (2108), 56 mA (2109)
Stall Torque: 11.1 mNm (2108), 11.6 mNm (2109)
Stall Current: 1.59 A (2108), 1.68 A (2109)
Output Power: 4.5 W (2108), 5.9 W (2109)
Maximum Efficiency: 66.3% (2108), 66.8% (2109)
Terminal Resistance: 7.54 Ω (2108), 8.94 Ω (2109)
Rated Torque: 1.6 mNm (both models)
Rated Speed: 13,111 rpm (2108), 16,646 rpm (2109)
Rated Current: 277 mA (2108), 279 mA (2109)
Friction Torque: 0.40 mNm (both models)
Back-EMF Constant: 0.76 mV/rpm (2108), 0.75 mV/rpm (2109)
Torque Constant: 7.22 mNm/A (2108), 7.17 mNm/A (2109)
Slope of N-T Curve: 1381 rpm/mNm (2108), 1659 rpm/mNm (2109)
Mechanical Time Constant: 3.5 ms (2108), 4.2 ms (2109)
Rotor Inertia: 0.23 g·cm² (both models)
Maximum Torque: 3.6 mNm (both models)

3. Mechanical Data

Shaft Radial Play: Specified but exact value not clearly stated
Shaft Axial Play: Specified but exact value not clearly stated
Maximum Shaft Radial Load: Provided in Japanese text, exact numeric values not extracted
Maximum Shaft Axial Load: Provided in Japanese text, exact numeric values not extracted
Maximum Shaft Axial Load at Standstill: Mentioned but numeric value unclear
Operating Temperature Range: Specified but exact range not extracted
Maximum Coil Temperature: Specified but exact value not extracted
Weight: Not explicitly stated

4. Additional Features and Notes

Motors include built-in Hall sensors and ball bearings.
For gearhead combinations, customers are advised to contact Namiki sales team.
Electrical connections and lead wire assignments are detailed, including Hall sensor outputs.
Specifications are subject to change without notice.
Manufacturer contact information provided for further inquiries.

5. Manufacturer Information

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

6. Summary of Key Parameters for B4S12-2108 and B4S12-2109

Parameter	B4S12-2108 (12V)	B4S12-2109 (15V)
No Load Speed (rpm)	15,320	19,300
No Load Current (mA)	55	56
Stall Torque (mNm)	11.1	11.6
Stall Current (A)	1.59	1.68
Output Power (W)	4.5	5.9
Max Efficiency (%)	66.3	66.8
Terminal Resistance (Ω)	7.54	8.94
Rated Torque (mNm)	1.6	1.6
Rated Speed (rpm)	13,111	16,646
Rated Current (mA)	277	279
Friction Torque (mNm)	0.40	0.40
Back-EMF Constant (mV/rpm)	0.76	0.75
Torque Constant (mNm/A)	7.22	7.17
Slope of N-T Curve (rpm/mNm)	1381	1659
Mechanical Time Constant (ms)	3.5	4.2
Rotor Inertia (g·cm²)	0.23	0.23
Max Torque (mNm)	3.6	3.6

Note: Some mechanical load limits and temperature ranges are referenced but exact numeric values were not clearly extracted from the document.

Catalog excerpts

NOLSNGOWLNI S53NSIH soma} feng QNHnOAHHHMM BMS BRUSHLESS MOTOR SERIES B4S12-21XX With Hall sensors, Ball bearing LBHS AxINONI For combination with gearhead: Please contact Namiki sales team Specifications 1 Nominal voltage 2 No load speed 3 No load current Slope of N-T curve Mechanical time constant Rotor inertia Max torque 出力軸遊び ( 軸方向 ) 21 Max shaft radial load 20 Shaft axial play 22 Max shaft axial load Max shaft axial load at standstill 19 Shaft radial play Hall sensor output ( u Mechanical data ‘HOUOM ONOAIE Stall current Output power Max efficiency Terminal resistance Rated torque Rated speed Rated current *3.4mm point from motor flange. Available only with hall sensor

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