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 StallMecha
nical
time
constant
[ms]
Max.
effici
ency
Torque
[mNm]
Speed
[rpm]
Current
[mA]
Output
Power
[W]
Speed
[rpm]
Current
[mA]
Torque
[mNm]
Current
[mA]
C4S10-1207 10 12 C4S10-1207 7.4 0.26 13,700 120 0.37 20,300 21 1.7 0.66 3.6 76.1

Brushless Motor

     
Dia.
[mm]
Length
[mm]
Products Nominal
Voltage
[V]
Nominal No-load StallMecha
nical
time
constant
[ms]
Max.
effici
ency
Torque
[mNm]
Speed
[rpm]
Current
[mA]
Output
Power
[W]
Speed
[rpm]
Current
[mA]
Torque
[mNm]
Current
[mA]
B4S17-1501 17.4 15 B4S17-1501 7.4 2.8 17,700 930 5.2 20,000 122 24.1 7.0 5.1 75
B4S22-32 22 32 B4S22-32 24 9.0 4,894 255 11.2 5540 34 77.15 1.93 4.0 75

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