BMS12-21XX with Planetary gear

Product catalog summary

Orbray BMS Brushless Motor Series Overview

This document provides detailed technical specifications for the Orbray BMS12-21XX brushless motor series combined with SPG12 planetary gearheads.

1. Product Models and Components

Motor Models: BMS12-2102, BMS12-2104
Gearhead Model: SPG12 planetary gear
Encoder Models: ETD12-2C, ETD12-2D, ETD12-2E (length with encoder TBD)

2. General Specifications

Parameter	Units	Values (various gear ratios)
Gear Ratio (Reduction Ratio)	Absolute value	3.50:1, 4.80:1, 12.25:1, 22.56:1, 58.19:1, 107.17:1, 509.07:1
Number of Stages	Stages	1 to 4 depending on ratio
Efficiency @ Rated Load	%	85%, 85%, 72%, 72%, 61%, 61%, 52%
Length (Motor + Gear)	mm	35.2 to 46.7 mm depending on gear ratio
Max Allowable Torque (Continuous)	mNm	100 mNm
Max Allowable Torque (Intermittent)	mNm	200 mNm

3. Electrical and Mechanical Performance (BMS12-2102P at 7.4 V)

Parameter	Units	Values (by gear ratio)
No Load Speed	rpm	6436, 4693, 1839, 999, 387, 210, 44
No Load Current	mA	146, 146, 146, 144, 146, 147, 148
Stall Torque	mNm	34, 47, 101, 187, 410, 754, 3045
Stall Current	mA	3941 (constant across ratios)

4. Electrical and Mechanical Performance (BMS12-2104P at 12 V)

Parameter	Units	Values (by gear ratio)
No Load Speed	rpm	6859, 5002, 1960, 1065, 413
No Load Current	mA	102, 102, 102, 100, 102
Stall Torque	mNm	36, 49, 106, 195, 427, 786, 3174
Stall Current	mA	2703 (constant across ratios)

5. Ordering Information

Example: BMS12-2102 motor with SPG12 gearhead at 3.5:1 ratio is ordered as BMS12-2102P3.5
Example: BMS12-2104 motor with SPG12 gearhead at 107:1 ratio is ordered as BMS12-2104P107

6. Notes and Contact Information

Specifications are subject to change without notice.
Manufacturer: Orbray Co., Ltd., Tokyo, Japan
Contact: [email protected]
Website: https://orbray.com/en/

Critical Information Summary

Gear ratios range from 3.5:1 up to 509:1 with corresponding efficiency decreasing as ratio increases.
Maximum continuous torque is 100 mNm; intermittent torque up to 200 mNm.
Stall torque and stall current values vary significantly with gear ratio and voltage.
Physical dimensions vary slightly with gear ratio; encoder lengths are to be determined.

Catalog excerpts

NOWONOOUIN! SSINISNG SMA NHIOAHHW BMS BRUSHLESS MOTOR SERIES BMS12-21XX with Planetary gear General specifications Reduction ratio(absolute value) Length (Motor + Gear + Encoder) Length (Motor + Encoder) 6 Max allowable torque (Continuous) YOLON OAS ‘WOLOW ONDE smmmoaawads WASUMS AHWWu 9 No load current 10 Stall torque 11 Stall current Ordering number Ordering number HOW TO ORDER (ご注文の際の型式名 ) BMS12-2102 MOTOR + SPG12(3.5:1) 一 BMS12-2102P3.5 BMS12-2104 MOTOR + SPG12(107:1) > BMS12-2104P107 Specifications are subject to change without notice. Orbray Co., Ltd. 3-8-22 Shinden, Adachi-ku, Tokyo 123-8511 Japan

Open the catalog to page 1