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Brushed Motor

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   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).
gearhead
 Brushed Motor
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
cons
tant
[ms]
Max.
effic
iency
[%]
Tor
que
[mNm]
Speed
[rpm]
Cur
rent
[mA]
Output
Power
[W]
Speed
[rpm]
Cur
revt
[mA]
Tor
eque
[mNm]
Cur
rent
[A]
7
17
3.7
0.14
17,100
101
0.25
20300
19
0.86
0.53
6.5
66
7.4
0.14
18,600
56
0.27
22,000
10
0.89
0.30
6.8
66
10
12
3.7
0.14
17,900
103
0.26
21,100
18
0.92
0.59
11
68
7.4
0.14
20,900
61
0.31
24,500
10
0.96
0.35
12
68
12.0
0.14
24,500
45
0.37
28,700
7.6
1.0
0.26
12
69
18
3.7
0.27
10,400
116
0.30
12,200
19
1.9
0.69
7.0
69
7.4
0.27
12,500
70
0.36
14,600
12
1.9
0.42
7.3
69
12.0
0.29
15,500
56
0.48
18,000
8.8
2.2
0.36
7.5
71
12
15
7.4
0.51
21,400
234
1.15
25,400
43
3.3
1.26
16
66
12.0
0.51
23,100
155
1.23
27,500
29
3.2
0.83
17
66
20
7.4
0.50
19,300
168
1.01
21,200
17
5.6
1.70
8.5
81
12.0
0.51
20,200
111
1.09
22,200
11
5.9
1.15
8.5
82
30
7.4
0.82
10,900
156
0.94
11,900
15
9.3
1.61
4.6
82
12.0
0.87
12,600
116
1.15
13,800
11
10
1.25
4.6
82
16
20
7.4
0.75
12,200
154
0.95
13,200
13
9.7
1.83
7.9
84
12.0
0.79
13,700
112
1.13
14,800
8.9
11
1.39
7.9
85
24.0
0.74
14,400
55
1.12
15,600
4.7
9.5
0.66
8.1
84
25
7.4
0.88
7,000
102
0.65
7,500
7.3
13
1.14
4.3
86
12.0
0.93
7,700
72
0.75
8,300
5.0
14
1.05
4.3
87
24.0
0.87
8,100
36
0.74
8,700
2.6
13
0.49
4.4
86
30
7.4
1.29
8,700
175
1.17
9,100
8.2
29
3.74
4.2
91
12.0
1.25
8,800
106
1.15
9,200
5.1
27
2.20
4.1
91
24.0
1.34
10,400
67
1.46
10,800
3.0
31
1.48
4.1
91
Dia.
[mm]
Length
[mm]
Products
Nomi
nal
Vol
tage
[V]
Tor
que
[mNm]
Speed
[rpm]
Cur
rent
[mA]
Output
Power
[W]
Speed
[rpm]
Cur
rent
[mA]
Tor
que
[mNm]
Cur
rent
[A]
mecha
nical
time
cons
tant
[ms]
Max.
effic
iency
[%]
Nominal
No-load
Stall
  

 

 
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