Brushless Motor

Uniqueness of Namiki Coreless DC Motor lies in its coil windings.

Because the rotor is free of other objects (no brush), it is designed for high power, and noise-less by principle. It is suitable for long-life use.

Output Because of no-contact design (no brush/commutator like cored/coreless motor), large current can be input and heat in the coil dissipates quickly
Life Long life time because of no-contact design
Control Linear characteristics
Cogging No magnetic cogging

In our brushless motor, we removed the mechanical contacts such as brushes and commutators used in conventional brushed motors, and applied an electric signal to take their place. The brushless motor requires an electric circuit board because there is no commutator. This motor (circuit board) has two types, one with a magnetic sensor, and the other with no sensor. The one with the magnetic sensor detects its position via the sensor, and the other detects the rotor magnet position via back-EMF. Brushless motor's features are as follows:

Features

  1. Stator coil is located outside in inner rotor type brushless motor. Therefore, it is good in heat dissipation.
    Because there are no contacts (brush/commutator), large current can be input to answer to high power needs.
  2. No mechanical noise and no electric noise for switching current(no brush and no commutator)
  3. Long life and high reliability (due to no-contact design)

In Namiki's brushless motor, stator is a slot-less core with cup-shaped coil, and rotor is the magnet inside. Therefore, magnetic force is even regardless of coil/magnet position, and motor rotation is free of cogging.

Issues & Challenges in Brushless Motor

As brushless motors have no mechanical contacts for polarity switching, they have high power and long lifespan. However, due to the rotating magnet core, the inertia is much larger than that of coreless brushed motor and the response time slower.
Namiki presents brushless motors that address these issues equally.

Brushless Motor Standard Model

Dia.
[mm]
Length
[mm]
Products Nominal
Voltage
[V]
Nominal Values No load Stall Mechanical time constant [ms] Max efficiency
[%]
Option
Torque
[mNm]
Speed
[rpm]
Current
[mA]
Output
[W]
Speed
[rpm]
Current
[mA]
Torque
[mNm]
Current
[A]
Connection Bearing
Terminals leadwire sleeve BB
4 8 BMN04-0829 3.0 0.01 24,200 53 0.04 37,000 28 0.04 0.10 9.2 22 A (sensorless)
7 13 BMS07-1307 3.0 0.06 17,100 182 0.2 21,300 120 0.30 0.43 7.3 22 B(A※)
BMS07-1318 5.0 0.06 17,900 117 0.2 22,300 78 0.30 0.28 7.7 22 B(A※)
10 10 BMS10-1003 4.0 0.17 30,400 384 0.9 37,900 185 0.86 1.19 10.9 37 C
BMS10-1008 6.0 0.15 27,100 208 0.8 33,800 103 0.75 0.63 11.1 36 C
18 BMS10-1802 7.4 0.63 27,000 351 4.5 31,300 63 4.54 2.14 3.9 69 C
BMS10-1806 12.0 0.68 30,800 268 4.9 35,800 49 4.86 1.61 4.1 68 C
12 15 BMS12-1503 7.4 0.93 28,200 571 5.0 33,700 112 5.66 2.92 5.5 65 D
BMS12-1506 12.0 1.08 27,000 424 5.0 33,200 96 5.79 1.86 5.3 60 D
21 BMS12-2102 7.4 1.83 19,200 706 6.9 22,800 100 11.60 3.94 2.7 71 D
BMS12-2104 12.0 1.60 21,100 418 7.7 24,300 70 12.09 2.70 2.8 70 D
16 20 BMS16-2001 7.4 3.20 18,800 1305 9.4 23,800 188 15.06 5.45 5.7 66 D
BMS16-2004 12.0 2.42 19,700 620 9.7 23,200 113 15.97 3.46 5.3 67 D
BMS16-2013 24.0 2.45 21,100 334 10.6 24,800 60 16.30 1.88 5.5 67 D
30 BMS16-3001 7.4 3.25 12,600 807 9.5 14,500 123 25.10 5.39 3.6 72 D
BMS16-3002 12.0 3.90 14,800 660 15.4 16,600 86 35.33 5.29 2.9 76 D
BMS16-3009 24.0 3.86 14,000 311 14.0 15,800 41 33.84 2.41 2.9 76 D
17 18 BMS17-1821 24.0 2.36 16,000 291 6.2 20,000 72 11.80 1.17 16.3 57 D
22 22 BMS22-21 24 5.50 10,000 381 10.2 12,000 80 32.30 1.85 7.9 62 D
BMN04-0829
Dia.[mm]
4
Length[mm]
8
Nominal Voltage [V]
3.0
Nominal Values:Torque[mNm]
0.01
Nominal Values:Speed[rpm]
24,200
Nominal Values:Current[mA]
53
Nominal Values:Output[W]
0.04
No-load : Speed [rpm]
37,000
No-load : Current [mA]
28
Stall : Torque [mNm]
0.04
Stall : Current [A]
0.10
Mechanical time constant [ms]
9.2
Max efficiency
22
Option:Connection :Terminals
A (sensorless)
Option:Connection :leadwire
A (sensorless)
Option:Bearing:sleeve
Option:Bearing:BB
BMS07-1307
Dia.[mm]
7
Length[mm]
13
Nominal Voltage [V]
3.0
Nominal Values:Torque[mNm]
0.06
Nominal Values:Speed[rpm]
17,100
Nominal Values:Current[mA]
182
Nominal Values:Output[W]
0.2
No-load : Speed [rpm]
21,300
No-load : Current [mA]
120
Stall : Torque [mNm]
0.30
Stall : Current [A]
0.43
Mechanical time constant [ms]
7.3
Max efficiency
22
Option:Connection :Terminals
B (A※)
Option:Connection :leadwire
B (A※)
Option:Bearing:sleeve
Option:Bearing:BB
BMS07-1318
Dia.[mm]
7
Length[mm]
13
Nominal Voltage [V]
5.0
Nominal Values:Torque[mNm]
0.06
Nominal Values:Speed[rpm]
17,900
Nominal Values:Current[mA]
117
Nominal Values:Output[W]
0.2
No-load : Speed [rpm]
22,300
No-load : Current [mA]
78
Stall : Torque [mNm]
0.30
Stall : Current [A]
0.43
Mechanical time constant [ms]
7.3
Max efficiency
22
Option:Connection :Terminals
B (A※)
Option:Connection :leadwire
B (A※)
Option:Bearing:sleeve
Option:Bearing:BB
BMS10-1003
Dia.[mm]
10
Length[mm]
10
Nominal Voltage [V]
4.0
Nominal Values:Torque[mNm]
0.17
Nominal Values:Speed[rpm]
30,400
Nominal Values:Current[mA]
384
Nominal Values:Output[W]
0.9
No-load : Speed [rpm]
37,900
No-load : Current [mA]
185
Stall : Torque [mNm]
0.86
Stall : Current [A]
1.19
Mechanical time constant [ms]
10.9
Max efficiency
37
Option:Connection :Terminals
C
Option:Connection :leadwire
C
Option:Bearing:sleeve
Option:Bearing:BB
BMS10-1008
Dia.[mm]
10
Length[mm]
10
Nominal Voltage [V]
4.0
Nominal Values:Torque[mNm]
0.17
Nominal Values:Speed[rpm]
27,100
Nominal Values:Current[mA]
208
Nominal Values:Output[W]
0.8
No-load : Speed [rpm]
33,800
No-load : Current [mA]
103
Stall : Torque [mNm]
0.75
Stall : Current [A]
0.63
Mechanical time constant [ms]
11.1
Max efficiency
36
Option:Connection :Terminals
C
Option:Connection :leadwire
C
Option:Bearing:sleeve
Option:Bearing:BB
BMS10-1802
Dia.[mm]
10
Length[mm]
18
Nominal Voltage [V]
7.4
Nominal Values:Torque[mNm]
0.63
Nominal Values:Speed[rpm]
27,000
Nominal Values:Current[mA]
351
Nominal Values:Output[W]
4.5
No-load : Speed [rpm]
31,300
No-load : Current [mA]
63
Stall : Torque [mNm]
4.54
Stall : Current [A]
2.14
Mechanical time constant [ms]
3.9
Max efficiency
69
Option:Connection :Terminals
C
Option:Connection :leadwire
C
Option:Bearing:sleeve
Option:Bearing:BB
BMS10-1806
Dia.[mm]
10
Length[mm]
18
Nominal Voltage [V]
12
Nominal Values:Torque[mNm]
0.68
Nominal Values:Speed[rpm]
30,800
Nominal Values:Current[mA]
268
Nominal Values:Output[W]
4.9
No-load : Speed [rpm]
35,800
No-load : Current [mA]
49
Stall : Torque [mNm]
4.86
Stall : Current [A]
1.61
Mechanical time constant [ms]
4.1
Max efficiency
68
Option:Connection :Terminals
C
Option:Connection :leadwire
C
Option:Bearing:sleeve
Option:Bearing:BB
BMS12-1503
Dia.[mm]
12
Length[mm]
15
Nominal Voltage [V]
7.4
Nominal Values:Torque[mNm]
0.93
Nominal Values:Speed[rpm]
28,200
Nominal Values:Current[mA]
571
Nominal Values:Output[W]
5.0
No-load : Speed [rpm]
33,700
No-load : Current [mA]
112
Stall : Torque [mNm]
5.66
Stall : Current [A]
2.92
Mechanical time constant [ms]
5.5
Max efficiency
65
Option:Connection :Terminals
D
Option:Connection :leadwire
D
Option:Bearing:sleeve
Option:Bearing:BB
BMS12-1506
Dia.[mm]
12
Length[mm]
15
Nominal Voltage [V]
12
Nominal Values:Torque[mNm]
1.08
Nominal Values:Speed[rpm]
27,000
Nominal Values:Current[mA]
424
Nominal Values:Output[W]
5.0
No-load : Speed [rpm]
33,200
No-load : Current [mA]
96
Stall : Torque [mNm]
5.79
Stall : Current [A]
1.86
Mechanical time constant [ms]
5.3
Max efficiency
60
Option:Connection :Terminals
D
Option:Connection :leadwire
D
Option:Bearing:sleeve
Option:Bearing:BB
BMS12-2102
Dia.[mm]
12
Length[mm]
21
Nominal Voltage [V]
7.4
Nominal Values:Torque[mNm]
1.83
Nominal Values:Speed[rpm]
19,200
Nominal Values:Current[mA]
706
Nominal Values:Output[W]
6.9
No-load : Speed [rpm]
22,800
No-load : Current [mA]
100
Stall : Torque [mNm]
11.60
Stall : Current [A]
3.94
Mechanical time constant [ms]
2.7
Max efficiency
71
Option:Connection :Terminals
D
Option:Connection :leadwire
D
Option:Bearing:sleeve
Option:Bearing:BB
BMS12-2104
Dia.[mm]
12
Length[mm]
21
Nominal Voltage [V]
12
Nominal Values:Torque[mNm]
1.4
Nominal Values:Speed[rpm]
21,300
Nominal Values:Current[mA]
350
Nominal Values:Output[W]
3.2
No-load : Speed [rpm]
24,300
No-load : Current [mA]
49
Stall : Torque [mNm]
11.6
Stall : Current [A]
2.8
Mechanical time constant [ms]
7.4
Max efficiency
74
Option:Connection :Terminals
D
Option:Connection :leadwire
D
Option:Bearing:sleeve
Option:Bearing:BB
BMS16-2001
Dia.[mm]
16
Length[mm]
20
Nominal Voltage [V]
7.4
Nominal Values:Torque[mNm]
3.2
Nominal Values:Speed[rpm]
18,800
Nominal Values:Current[mA]
1305
Nominal Values:Output[W]
9.4
No-load : Speed [rpm]
23,800
No-load : Current [mA]
188
Stall : Torque [mNm]
15.06
Stall : Current [A]
5.45
Mechanical time constant [ms]
5.7
Max efficiency
66
Option:Connection :Terminals
D
Option:Connection :leadwire
D
Option:Bearing:sleeve
Option:Bearing:BB
BMS16-2004
Dia.[mm]
16
Length[mm]
20
Nominal Voltage [V]
12.0
Nominal Values:Torque[mNm]
2.42
Nominal Values:Speed[rpm]
19,700
Nominal Values:Current[mA]
620
Nominal Values:Output[W]
9.7
No-load : Speed [rpm]
23,200
No-load : Current [mA]
113
Stall : Torque [mNm]
15.97
Stall : Current [A]
3.46
Mechanical time constant [ms]
5.3
Max efficiency
67
Option:Connection :Terminals
D
Option:Connection :leadwire
D
Option:Bearing:sleeve
Option:Bearing:BB
BMS16-2013
Dia.[mm]
16
Length[mm]
20
Nominal Voltage [V]
24.0
Nominal Values:Torque[mNm]
2.45
Nominal Values:Speed[rpm]
21,100
Nominal Values:Current[mA]
334
Nominal Values:Output[W]
10.6
No-load : Speed [rpm]
24,800
No-load : Current [mA]
60
Stall : Torque [mNm]
16.30
Stall : Current [A]
1.88
Mechanical time constant [ms]
5.5
Max efficiency
67
Option:Connection :Terminals
D
Option:Connection :leadwire
D
Option:Bearing:sleeve
Option:Bearing:BB
BMS16-3001
Dia.[mm]
16
Length[mm]
30
Nominal Voltage [V]
7.4
Nominal Values:Torque[mNm]
3.26
Nominal Values:Speed[rpm]
12,600
Nominal Values:Current[mA]
807
Nominal Values:Output[W]
9.5
No-load : Speed [rpm]
14,500
No-load : Current [mA]
123
Stall : Torque [mNm]
25.10
Stall : Current [A]
5.39
Mechanical time constant [ms]
3.6
Max efficiency
72
Option:Connection :Terminals
D
Option:Connection :leadwire
D
Option:Bearing:sleeve
Option:Bearing:BB
BMS16-3002
Dia.[mm]
16
Length[mm]
30
Nominal Voltage [V]
12.0
Nominal Values:Torque[mNm]
3.90
Nominal Values:Speed[rpm]
14,800
Nominal Values:Current[mA]
660
Nominal Values:Output[W]
15.4
No-load : Speed [rpm]
16,600
No-load : Current [mA]
86
Stall : Torque [mNm]
35.33
Stall : Current [A]
5.29
Mechanical time constant [ms]
2.9
Max efficiency
76
Option:Connection :Terminals
D
Option:Connection :leadwire
D
Option:Bearing:sleeve
Option:Bearing:BB
BMS16-3009
Dia.[mm]
16
Length[mm]
30
Nominal Voltage [V]
24.0
Nominal Values:Torque[mNm]
3.86
Nominal Values:Speed[rpm]
14,000
Nominal Values:Current[mA]
311
Nominal Values:Output[W]
14.0
No-load : Speed [rpm]
15,800
No-load : Current [mA]
41
Stall : Torque [mNm]
33.84
Stall : Current [A]
2.41
Mechanical time constant [ms]
2.9
Max efficiency
76
Option:Connection :Terminals
D
Option:Connection :leadwire
D
Option:Bearing:sleeve
Option:Bearing:BB
BMS17-1821
Dia.[mm]
17
Length[mm]
18
Nominal Voltage [V]
24.0
Nominal Values:Torque[mNm]
2.36
Nominal Values:Speed[rpm]
16,000
Nominal Values:Current[mA]
291
Nominal Values:Output[W]
6.2
No-load : Speed [rpm]
20,000
No-load : Current [mA]
72
Stall : Torque [mNm]
11.80
Stall : Current [A]
1.17
Mechanical time constant [ms]
16.3
Max efficiency
57
Option:Connection :Terminals
D
Option:Connection :leadwire
D
Option:Bearing:sleeve
Option:Bearing:BB
BMS22-2113
Dia.[mm]
22
Length[mm]
22
Nominal Voltage [V]
24.0
Nominal Values:Torque[mNm]
5.50
Nominal Values:Speed[rpm]
10,000
Nominal Values:Current[mA]
381
Nominal Values:Output[W]
10.2
No-load : Speed [rpm]
12,000
No-load : Current [mA]
80
Stall : Torque [mNm]
32.30
Stall : Current [A]
1.85
Mechanical time constant [ms]
7.9
Max efficiency
62
Option:Connection :Terminals
D
Option:Connection :leadwire
D
Option:Bearing:sleeve
Option:Bearing:BB

Meaning

    • ○ = Available as standard
    • △ = Available as option
    • × = Not available
    • A~G = Pin assignment pattern (see table)

Brushless Motor Pin Assignment Pattern

  Pattern #1 #2 #3 #4 #5 #6 #7 #8 Applicable motor
FPC A coil U coil V COM coil W - - - - BMN04, BMS07
(sensorless)
B sensor V sensor U Gnd Vdd sensor W coil V coil W coil U BMS07
leadwire C coil W coil U sensor U sensor V sensor W coil V Gnd Vdd BMS10 series
D coil U coil V coil W Vdd Gnd sensor U sensor V sensor W BMS12/
BMS16 series/
B4S12
E coil W coil V coil U Gnd Vcc sensor W sensor V sensor U B4S22-3212
Terminals F coil W sensor W COM coil W - - - - BRS/BRT17-15
BRS/BRT17-18
G H1 sensor U H2 Vcc H3 Gnd H4 sensor W H5 sensor W L1 coil U L2 coil V L3 coil W BRS/BRT12-15
FPC : Pattern A
#1
coil U
#2
coil V
#3
COM
#4
coil W
#5
-
#6
-
#7
-
#8
-
Applicable motor
BMN04, BMS07(sensorless時)
FPC : Pattern B
#1
sensor V
#2
sensor U
#3
Gnd
#4
Vdd
#5
sensor W
#6
coil V
#7
coil W
#8
coil U
Applicable motor
BMS07
leadwire : Pattern C
#1
coil W
#2
coil U
#3
sensor U
#4
sensor V
#5
sensor W
#6
coil V
#7
Gnd
#8
Vdd
Applicable motor
BMS10 series
leadwire : Pattern D
#1
coil U
#2
coil V
#3
sensor W
#4
Vdd
#5
Gnd
#6
sensor U
#7
sensor V
#8
sensor W
Applicable motor
BMS12/BMS16 series/B4S12
leadwire : Pattern E
#1
coil W
#2
coil V
#3
coil U
#4
Gnd
#5
Vcc
#6
sensor W
#7
sensor V
#8
sensor U
Applicable motor
B4S22-3212
Terminals : Pattern F
#1
coil W
#2
sensor W
#3
Vcc
#4
coil U
#5
sensor V
#6
Gnd
#7
coil V
#8
sensor U
Applicable motor
B4S22-3212
Terminals : Pattern G
#1
H1 sensor U
#2
H2 Vcc
#3
H3 Gnd
#4
H4 sensor W
#5
H5 sensor W
#6
L1 coil U
#7
L2 coil V
#8
L3 coil W
Applicable motor
BRS/BRT12-15

Outer Rotor Pancake Brushless Motor

Dia. [mm] Thickness [mm] Products Nominal Voltage [V] No-load Stall
Speed [rpm] Currevt [A] Toreque [mNm] Current [A]
23 12 SOBL23-1207 12 5730 0.127 26.8 1.38
SOBL23-1207
Dia. [mm]
23
Thickness [mm]
12
Nominal Voltage [V]
12
No-load:Speed [rpm]
5730
No-load:Currevt [A]
0.127
Stall:Toreque [mNm]
26.8
Stall:Current [A]
1.38
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