Brushed Motor

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

Coreless moving coil is light weight, superior in quick starting and stopping (high speed response).

Efficiency High efficiency and no iron loss
Responsiveness Very low inertia and able to start/stop quickly
Life Low inductance and long life
Control Linear characteristics
Cogging No magnetic cogging
Electromagnetic noise Low electromagnetic interference

Brushed coreless motor does not have an iron core, and consists of a cup-shaped core as rotor and a permanent magnet inside the rotor as stator. Brushed coreless motor features the following: Coreless motor features the following:

Features
  1. Cup-shaped rotor coil is very light weight and has a small moment of inertia, allowing the motor to start and stop quickly.
  2. Because there is no cogging due to stator-rotor positioning, it features smooth rotation, low noise and low vibration.
  3. Motor can be made in compact sizes because it is made only of rare earth magnet, coil and rotor.

For the reasons mentioned above, our brushed coreless motor is used in many applications that require high precision, high speed response, as well as compactness and high efficiency.

Issues & challenges in Brushed Motor

The primary factors affecting the lifespan of brushed motors are abrasion due to rotational contact of the brush and commutator, and electric corrosion during polarity switching. While precious metal contact material minimizes the electric corrosion, physical abrasion remains an issue. Changing the brush material to carbon-based can prevent the mechanical wearing, but at the same time, this can increase electric spark noise. In general, brushed motors are not suitable for power motors because they can't accept large flow of electric current.
Namiki presents brushed coreless motors that address these issues equally.

Brushed Motor Standard Model

Dia.
[mm]
Length
[mm]
Products Nomi
nal
Vol
tage
[V]
Nominal No-load Stall Mecha
nical
time
constant
[ms]
Max.
effici
ency
Torque
[mNm]
Speed
[rpm]
Current
[mA]
Output
Power
[W]
Speed
[rpm]
Current
[mA]
Torque
[mNm]
Current
[A]
7 17 CMS07-1707 3.7 0.14 17,100 104 0.5 20,200 19 0.94 0.57 6.8 67
CMS07-1726 7.4 0.14 18,600 54 0.5 22,100 10 0.84 0.28 7.5 65
10 13 CMS10-1306 3.7 0.14 17,900 103 0.5 21,100 18 0.92 0.59 11.3 68
CMS10-1321 7.4 0.14 20,900 61 0.6 24,500 10 0.96 0.35 11.8 68
CMS10-1346 12.0 0.14 24,500 45 0.7 28,700 8 1.0 0.26 12.3 69
18 CMS10-1805 3.7 0.27 10,400 116 0.6 12,200 19 1.89 0.68 7.0 69
CMS10-1818 7.4 0.27 12,500 70 0.7 14,600 12 1.91 0.42 7.3 69
CMS10-1834 12.0 0.29 15,500 56 1.0 18,000 9 2.16 0.36 7.5 71
12 15 CMS12-1506 7.4 0.44 21,900 186 2.2 25,100 27 3.40 1.26 15.4 73
CMS12-1514 12.0 0.43 23,700 123 2.4 27,200 18 3.36 0.83 15.9 73
20 CMS12-2004 7.4 0.44 20,400 150 3.2 22,200 13 5.48 1.74 8.9 83
CMS12-2010 12.0 0.45 20,400 99 3.5 23,000 8 5.77 1.17 8.8 82
30 CMS12-3005 7.4 0.79 11,800 162 2.9 13,000 16 8.55 1.61 5.5 81
CMS12-3010 12.0 0.83 13,700 121 3.7 15,000 12 9.40 1.25 5.6 82
16 23 CMS16-2304 7.4 0.89 13,000 209 3.3 14,500 24 8.78 1.85 9.3 79
CMS16-2309 12.0 0.94 14,000 145 3.9 15,500 16 9.67 1.34 9.3 80
CMS16-2337 24.0 0.89 14,900 73 3.8 16,600 8 8.66 0.64 9.5 79
28 CMS16-2805 7.4 1.03 8,100 146 2.6 8,900 15 11.05 1.42 5.9 81
CMS16-2812 12.0 1.08 8,400 97 2.9 9,200 10 12.14 0.99 6.0 81
CMS16-2852 24.0 1.02 8,700 48 2.7 9,600 5 10.85 0.46 6.1 80
33 CMS16-3302 7.4 1.63 9,500 250 6.9 10,100 17 26.13 3.76 4.4 87
CMS16-3306 12.0 1.58 9,300 147 6.4 9,900 10 24.66 2.15 4.4 87
CMS16-3317 24.0 1.69 10,900 92 8.5 11,600 6 28.09 1.43 4.4 88
CMS07-1707
Dia.Φ [mm]
7
Length [mm]
17
Nominal Voltage [V]
3.7
Nominal Values : Torque [mNm]
0.14
Nominal Values : Speed [rpm]
17,100
Nominal Values : Current [mA]
104
Nominal Values : Output Power [W]
0.5
No-load : Speed [rpm]
20,200
No-load : Current [mA]
19
Stall : Torque [mNm]
0.94
Stall : Current [A]
0.57
Mechanical time constant [ms]
6.8
Max efficiency
67
CMS07-1726
Dia.Φ [mm]
7
Length [mm]
17
Nominal Voltage [V]
7.4
Nominal Values : Torque [mNm]
0.14
Nominal Values : Speed [rpm]
18,600
Nominal Values : Current [mA]
54
Nominal Values : Output Power [W]
0.5
No-load : Speed [rpm]
22,100
No-load : Current [mA]
10
Stall : Torque [mNm]
0.84
Stall : Current [A]
0.28
Mechanical time constant [ms]
7.5
Max efficiency
65
CMS10-1306
Dia.Φ [mm]
10
Length [mm]
13
Nominal Voltage [V]
3.7
Nominal Values : Torque [mNm]
0.14
Nominal Values : Speed [rpm]
17,900
Nominal Values : Current [mA]
103
Nominal Values : Output Power [W]
0.5
No-load : Speed [rpm]
21,100
No-load : Current [mA]
18
Stall : Torque [mNm]
0.92
Stall : Current [A]
0.59
Mechanical time constant [ms]
11.3
Max efficiency
65
CMS10-1321
Dia.Φ [mm]
10
Length [mm]
13
Nominal Voltage [V]
7.4
Nominal Values : Torque [mNm]
0.14
Nominal Values : Speed [rpm]
20,900
Nominal Values : Current [mA]
61
Nominal Values : Output Power [W]
0.6
No-load : Speed [rpm]
24,500
No-load : Current [mA]
10
Stall : Torque [mNm]
0.96
Stall : Current [A]
0.35
11.8
Max efficiency
68
CMS10-1346
Dia.Φ [mm]
10
Length [mm]
13
Nominal Voltage [V]
12.0
Nominal Values : Torque [mNm]
0.14
Nominal Values : Speed [rpm]
24,500
Nominal Values : Current [mA]
45
Nominal Values : Output Power [W]
0.7
No-load : Speed [rpm]
28,700
No-load : Current [mA]
8
Stall : Torque [mNm]
1.00
Stall : Current [A]
0.26
Mechanical time constant [ms]
12.3
Max efficiency
69
CMS10-1805
Dia.Φ [mm]
10
Length [mm]
18
Nominal Voltage [V]
3.7
Nominal Values : Torque [mNm]
0.27
Nominal Values : Speed [rpm]
10,400
Nominal Values : Current [mA]
116
Nominal Values : Output Power [W]
0.6
No-load : Speed [rpm]
12,200
No-load : Current [mA]
19
Stall : Torque [mNm]
1.89
Stall : Current [A]
0.68
Mechanical time constant [ms]
7.0
Max efficiency
69
CMS10-1818
Dia.Φ [mm]
10
Length [mm]
18
Nominal Voltage [V]
7.4
Nominal Values : Torque [mNm]
0.27
Nominal Values : Speed [rpm]
12,500
Nominal Values : Current [mA]
70
Nominal Values : Output Power [W]
0.7
No-load : Speed [rpm]
14,600
No-load : Current [mA]
12
Stall : Torque [mNm]
1.91
Stall : Current [A]
0.42
Mechanical time constant [ms]
7.3
Max efficiency
69
CMS10-1834
Dia.Φ [mm]
10
Length [mm]
18
Nominal Voltage [V]
12.0
Nominal Values : Torque [mNm]
0.29
Nominal Values : Speed [rpm]
15,500
Nominal Values : Current [mA]
56
Nominal Values : Output Power [W]
1.0
No-load : Speed [rpm]
18,000
No-load : Current [mA]
9
Stall : Torque [mNm]
2.16
Stall : Current [A]
0.36
Mechanical time constant [ms]
7.5
Max efficiency
71
CMS12-1506
Dia.Φ [mm]
12
Length [mm]
15
Nominal Voltage [V]
7.4
Nominal Values : Torque [mNm]
0.44
Nominal Values : Speed [rpm]
21,900
Nominal Values : Current [mA]
186
Nominal Values : Output Power [W]
2.2
No-load : Speed [rpm]
25,100
No-load : Current [mA]
27
Stall : Torque [mNm]
3.40
Stall : Current [A]
1.26
Mechanical time constant [ms]
15.4
Max efficiency
73
CMS12-1514
Dia.Φ [mm]
12
Length [mm]
15
Nominal Voltage [V]
12.0
Nominal Values : Torque [mNm]
0.43
Nominal Values : Speed [rpm]
23,700
Nominal Values : Current [mA]
123
Nominal Values : Output Power [W]
2.4
No-load : Speed [rpm]
27,200
No-load : Current [mA]
18
Stall : Torque [mNm]
3.36
Stall : Current [A]
0.83
Mechanical time constant [ms]
15.9
Max efficiency
73
CMS12-2004
Dia.Φ [mm]
12
Length [mm]
20
Nominal Voltage [V]
7.4
Nominal Values : Torque [mNm]
0.44
Nominal Values : Speed [rpm]
20,400
Nominal Values : Current [mA]
150
Nominal Values : Output Power [W]
3.2
No-load : Speed [rpm]
22,200
No-load : Current [mA]
13
Stall : Torque [mNm]
5.48
Stall : Current [A]
1.74
Mechanical time constant [ms]
8.9
Max efficiency
83
CMS12-2010
Dia.Φ [mm]
12
Length [mm]
20
Nominal Voltage [V]
12.0
Nominal Values : Torque [mNm]
0.45
Nominal Values : Speed [rpm]
21,200
Nominal Values : Current [mA]
99
Nominal Values : Output Power [W]
3.5
No-load : Speed [rpm]
23,000
No-load : Current [mA]
8
Stall : Torque [mNm]
5.77
Stall : Current [A]
1.17
Mechanical time constant [ms]
8.8
Max efficiency
84
CMS12-3005
Dia.Φ [mm]
12
Length [mm]
30
Nominal Voltage [V]
7.4
Nominal Values : Torque [mNm]
0.79
Nominal Values : Speed [rpm]
11,800
Nominal Values : Current [mA]
162
Nominal Values : Output Power [W]
2.9
No-load : Speed [rpm]
13,000
No-load : Current [mA]
16
Stall : Torque [mNm]
8.55
Stall : Current [A]
1.61
Mechanical time constant [ms]
5.5
Max efficiency
81
CMS12-3010
Dia.Φ [mm]
12
Length [mm]
30
Nominal Voltage [V]
12.0
Nominal Values : Torque [mNm]
0.83
Nominal Values : Speed [rpm]
13,700
Nominal Values : Current [mA]
121
Nominal Values : Output Power [W]
3.7
No-load : Speed [rpm]
15,000
No-load : Current [mA]
12
Stall : Torque [mNm]
9.40
Stall : Current [A]
1.25
Mechanical time constant [ms]
5.6
Max efficiency
82
CMS16-2304
Dia.Φ [mm]
16
Length [mm]
23
Nominal Voltage [V]
7.4
Nominal Values : Torque [mNm]
0.89
Nominal Values : Speed [rpm]
13,000
Nominal Values : Current [mA]
209
Nominal Values : Output Power [W]
3.3
No-load : Speed [rpm]
14,500
No-load : Current [mA]
24
Stall : Torque [mNm]
8.78
Stall : Current [A]
1.85
Mechanical time constant [ms]
9.3
Max efficiency
79
CMS16-2309
Dia.Φ [mm]
16
Length [mm]
23
Nominal Voltage [V]
12.0
Nominal Values : Torque [mNm]
0.94
Nominal Values : Speed [rpm]
14,000
Nominal Values : Current [mA]
145
Nominal Values : Output Power [W]
3.9
No-load : Speed [rpm]
15,500
No-load : Current [mA]
16
Stall : Torque [mNm]
9.67
Stall : Current [A]
1.34
Mechanical time constant [ms]
9.3
Max efficiency
80
CMS16-2337
Dia.Φ [mm]
16
Length [mm]
23
Nominal Voltage [V]
24.0
Nominal Values : Torque [mNm]
0.89
Nominal Values : Speed [rpm]
14,900
Nominal Values : Current [mA]
73
Nominal Values : Output Power [W]
3.9
No-load : Speed [rpm]
16,600
No-load : Current [mA]
8
Stall : Torque [mNm]
8.66
Stall : Current [A]
0.64
Mechanical time constant [ms]
9.5
Max efficiency
79
CMS16-2805
Dia.Φ [mm]
16
Length [mm]
28
Nominal Voltage [V]
7.4
Nominal Values : Torque [mNm]
1.03
Nominal Values : Speed [rpm]
8,100
Nominal Values : Current [mA]
146
Nominal Values : Output Power [W]
2.6
No-load : Speed [rpm]
8,900
No-load : Current [mA]
15
Stall : Torque [mNm]
11.05
Stall : Current [A]
1.42
Mechanical time constant [ms]
5.9
Max efficiency
81
CMS16-2812
Dia.Φ [mm]
16
Length [mm]
28
Nominal Voltage [V]
12.0
Nominal Values : Torque [mNm]
1.08
Nominal Values : Speed [rpm]
8,400
Nominal Values : Current [mA]
97
Nominal Values : Output Power [W]
2.9
No-load : Speed [rpm]
9,200
No-load : Current [mA]
10
Stall : Torque [mNm]
12.14
Stall : Current [A]
0.99
Mechanical time constant [ms]
6.0
Max efficiency
81
CMS16-2852
Dia.Φ [mm]
16
Length [mm]
28
Nominal Voltage [V]
24.0
Nominal Values : Torque [mNm]
1.02
Nominal Values : Speed [rpm]
8,700
Nominal Values : Current [mA]
48
Nominal Values : Output Power [W]
2.7
No-load : Speed [rpm]
9,600
No-load : Current [mA]
5
Stall : Torque [mNm]
10.85
Stall : Current [A]
0.46
Mechanical time constant [ms]
6.1
Max efficiency
80
CMS16-3302
Dia.Φ [mm]
16
Length [mm]
33
Nominal Voltage [V]
7.4
Nominal Values : Torque [mNm]
1.63
Nominal Values : Speed [rpm]
9,500
Nominal Values : Current [mA]
250
Nominal Values : Output Power [W]
6.9
No-load : Speed [rpm]
10,100
No-load : Current [mA]
17
Stall : Torque [mNm]
26.13
Stall : Current [A]
3.76
Mechanical time constant [ms]
4.4
Max efficiency
87
CMS16-3306
Dia.Φ [mm]
16
Length [mm]
33
Nominal Voltage [V]
12.0
Nominal Values : Torque [mNm]
1.58
Nominal Values : Speed [rpm]
9,300
Nominal Values : Current [mA]
147
Nominal Values : Output Power [W]
6.4
No-load : Speed [rpm]
9,900
No-load : Current [mA]
10
Stall : Torque [mNm]
24.66
Stall : Current [A]
2.15
Mechanical time constant [ms]
4.4
Max efficiency
87
CMS16-3317
Dia.Φ [mm]
16
Length [mm]
33
Nominal Voltage [V]
24.0
Nominal Values : Torque [mNm]
1.69
Nominal Values : Speed [rpm]
10,900
Nominal Values : Current [mA]
92
Nominal Values : Output Power [W]
8.5
No-load : Speed [rpm]
11,600
No-load : Current [mA]
6
Stall : Torque [mNm]
28.09
Stall : Current [A]
1.43
Mechanical time constant [ms]
4.4
Max efficiency
88
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