Brushless Motor BMS12-21DC Coreless

Sensorless, Sleeve bearing Brushless Motor.

BMS12-21 Specifications

    Brushless Motor BMS12-2102 Brushless Motor BMS12-2104
1 Nomal voltage 7.4 12.0 V
2 No load speed 22800 24300 rpm
3 No load current 100 70 mA
4 Stall torque 11.60 12.09 mNm
5 Stall current 3940 2700 mA
6 Output power 6.9 7.7 W
7 Max efficiency 71 70 %
8 Terminal resistance 1.88 4.44 Ω
9 Rated torque 1.83 1.60 mNm
10 Rated speed 19200 21100 rpm
11 Rated current 706 418 mA
12 Friction torque 0.30 0.32 mNm
13 Back-EMF constant 0.316 0.481 mV/rpm
14 Torque constant 3.02 4.59 mNm/A
15 Slope of N-T curve 1965 2009 rpm/mNm
16 Mechanical time constant 2.71 2.77 ms
17 Rotor inertia 0.12 0.12 gcm2
18 Max torque 5.80 6.05 mNm

*BMS12-21 is a Brushless Motor with a diameter of 12 mm and length of 21 mm.

Mechanical data

19 Shaft raddial play 0.015 mm
20 Shaft axial play 0.23 mm
21 Max shaft radial load 0.5(3.9mm*) N
22 Max shaft axial load 0.15 N
23 Max shaft axial load at standstill 7.8 N
24 Operating temperature -20~80
25 Max coil temperature 90
26 Weight 13.4 g

*measured at () mm from flange

Environmental data

#1

Lw

Motor winding U
#2 Lu Motor winding V
#3 Hu Motor winding W
#4 Hv Input voltage 3.0V(1.6~5.5V)
#5 Hw GND
#6 Lv Hall sensor output U
#7 Gnd Hall sensor output V
#8 Vdd Hall sensor output W

Sensored version available as option.

BMS12-21

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