4pole High Torque Motor

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

By applying 4-pole magnet, effective magnet density area is enlarged, and the torque constant is greatly enhanced.

Features

Effective magnet density area: +30% (Namiki test result)
Total magnetic flux increased +30% from 2 pole magnet.
Torque constant: +60% (Namiki test result)
When running with the same road, current consumption is 35% less than 2-pole magnet motor.
Mechanical time constant: -60% (Namiki test result)
With enhanced torque constant, response speed is also improved by 40%.


As a pioneer in coreless motors, Namiki has pursued development of high torque motors. Generating high torque by enlarging the magnet or inputting a large current has its limitations in terms of heat generation and magnet materials. Namiki tried to increase torque by increasing number of magnet poles form 2 to 4.
By applying a 4-pole magnet, the effective magnet density area is enlarged. As a result, it contributed to a higher torque constant and low current consumption. Moreover, it enhanced mechanical time constant, so even the response speed became quicker.
Using diamond processing technology, a 4-pole magnet processing method has been established in Namiki.

Brushed Motor

 
Dia.
[mm]
Length
[mm]
Products Nominal
Voltage

[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]
10 13 C4S10-13XX 4.7 0.28 13500 136 0.7 16300 28 1.66 0.66 4.9 63
C4S10-13XX
Dia.[mm]
10
Length[mm]
13
Nominal Voltage [V]
4.7
Nominal Values:Torque[mNm]
0.28
Nominal Values:Speed[rpm]
13500
Nominal Values:Current [mA]
136
Nominal Values:Output [W]
0.7
No-load : Speed [rpm]
16300
No-load : Current [mA]
28
Stall : Torque [mNm]
1.66
Stall : Current [A]
0.66
Mechanical time constant [ms]
4.9
Max efficiency
63

Brushless Motor

 
Dia
[mm]
Length
[mm]
Products Nominal
Voltage

[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]
12 21 B4S12-2104 7.4 2.4 17900 108 8.3 21300 108 14.90 4.70 3.6 72
B4S12-2109 12.0 2.4 16100 60 7.6 19200 60 15.10 2.60 3.2 72
B4S12-2132 24.0 2.4 19600 36 9.8 23000 36 16.20 1.70 3.6 73
22 32 B4S22-32XX 24.0 9.0 4900 255 11.2 5540 34 77.15 1.93 4.0 75
B4S12-2104
Dia.[mm]
12
Length[mm]
21
Nominal Voltage [V]
7.4
Nominal Values:Torque[mNm]
2.4
Nominal Values:Speed[rpm]
17,900
Nominal Values:Current [mA]
108
Nominal Values:Output [W]
8.3
No-load : Speed [rpm]
21300
No-load : Current [mA]
108
Stall : Torque [mNm]
14.90
Stall : Current [A]
4.70
Mechanical time constant [ms]
3.6
Max efficiency
72
B4S12-2109
Dia.[mm]
12
Length[mm]
21
Nominal Voltage [V]
12.0
Nominal Values:Torque[mNm]
2.4
Nominal Values:Speed[rpm]
16100
Nominal Values:Current [mA]
60
Nominal Values:Output [W]
7.6
No-load : Speed [rpm]
19200
No-load : Current [mA]
60
Stall : Torque [mNm]
15.10
Stall : Current [A]
2.60
Mechanical time constant [ms]
3.2
Max efficiency
72
B4S12-2132
Dia.[mm]
12
Length[mm]
21
Nominal Voltage [V]
24.0
Nominal Values:Torque[mNm]
2.4
Nominal Values:Speed[rpm]
19600
Nominal Values:Current [mA]
36
Nominal Values:Output [W]
9.8
No-load : Speed [rpm]
23000
No-load : Current [mA]
36
Stall : Torque [mNm]
16.20
Stall : Current [A]
1.70
Mechanical time constant [ms]
3.6
Max efficiency
73/dd>
B4S22-32XX
Dia.[mm]
22
Length[mm]
32
Nominal Voltage [V]
24.0
Nominal Values:Torque[mNm]
9.0
Nominal Values:Speed[rpm]
4900
Nominal Values:Current [mA]
255
Nominal Values:Output [W]
11.2
No-load : Speed [rpm]
5540
No-load : Current [mA]
34
Stall : Torque [mNm]
77.15
Stall : Current [A]
19.30
Mechanical time constant [ms]
4.0
Max efficiency
75
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