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Brushless Motor

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   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.
   
gearhead
 Brushless motor
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
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]
4
8
3.0
0.014
24200
53
0.04
37000
28
0.04
0.1
0.04
22
10
10
7.4
0.44
52300
810
2.4
71700
300
1.6
0.59
3.0
40
12
0.43
55000
540
2.5
76300
210
1.5
0.35
3.1
38
18
7.4
0.72
31600
470
2.4
37200
84
4.7
0.42
4.6
68
12
0.70
32800
300
2.4
38900
56
4.5
0.36
4.6
66
12
15
7.4
0.93
28200
570
2.7
33700
112
5.7
1.26
5.0
65
12
0.92
30300
380
2.9
36200
74
5.5
0.83
5.3
64
21
7.4
1.4
19600
530
2.9
22300
73
11.7
1.70
6.9
74
12
1.4
21300
350
3.2
24300
49
11.6
1.15
7.4
74
16
20
7.4
2.0
19500
740
4.2
22000
94
18.0
1.83
10.4
76
12
1.9
19600
440
4.0
22200
59
16.4
1.39
9.6
75
24
2.0
21000
240
4.3
23700
31
16.8
0.66
10.4
75
30
7.4
3.0
15900
810
5.0
17300
74
36.1
1.14
16.4
83
12
3.0
16300
510
5.1
17800
47
35.4
1.05
16.5
83
24
2.8
16200
240
4.8
17800
23
32.6
0.49
15.2
82
22
32
24
9.0
4,894
255
11.2
5540
34
77.15
1.93
4.0
75
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

 

Outer Rotor Pancake Brushless Motor
Dia.
[mm]
Thickness
[mm]
Products
Nomi
nal
Vol
tage
[V]
No-load
Stall
Speed
[rpm]
Cur
revt
[A]
Tor
eque
[mNm]
Cur
rent
[A]
23
12
12
5730
0.127
26.8
1.38

 

  

 




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