RC Servo Motor

RC servo motor pursued "high speed response" and "high output" with evolution of batteries.

Brushed Motor

Rotor is made of a cup-shaped coreless winding coil. It features low inertia, and high speed response.

Brushless Motor

Stator is a coreless coil winding. No cogging in rotation, designed to run large current input, high output and high heat dissipation.

In RC servo applications, the mechanical time constant (the time it takes the servo to reach top speed from zero) is one of the most important specifications. Hence coreless motor, with its basket coiled rotor and faster response time, has conventionally been chosen over iron cored motor. RC servos require quick, repetitive left and right motion in a 60 degree angle, which means the motor is always running at the maximum current. This causes the coil to heat up and remain hot for the entire duration of use, limiting the lifespan. As such, RC servo is considered one of the hardest applications for DC brushed motors.
Adamant Namiki developed a coreless coiled brushless motor for RC applications that resolves both lifespan limit and the need for quick response for the first time in the RC industry.
As rechargeable batteries have evolved tremendously from Ni-Cd to high power Ni-MH, Li-Fe, and Li-Po, Adamant Namiki has developed a brushless DC motor for RC applications that is compatible with this type of high power performance. Along with this high power output, the motor also has the fastest mechanical time constant. We released the long-awaited brushless motor within the predetermined sizes of 12mmOD x 15mmL and 17mmOD x 18mmL, with a mechanical time constant faster than conventional coreless DC motors, and established a well-accepted, popular product in the field. Adamant Namiki's RC servo motor, in combination with servo makers' unique control systems, demonstrates high performance in torque and speed under all conditions, and achieves a precise operational feel.

Brushed Motor

RC Standard

φ[mm] Length [mm] Products Nominal Voltage [V] shaft
Φ
[mm]
Output [W] No load Stall Mechanical time constant [ms] Max efficiency
[%]
Speed
[rpm]
Current
[mA]
Torque
[mNm]
Current
[A]
12 15 CRS12-1503 7.4 1.0 4.3 37,100 63 4.41 2.4 18.9 71
17 15 CRS17-1502 7.4 1.2 8.1 23,900 50 12.95 4.4 19.8 80
17 18 CRS17-1801 7.4 1.2 10.1 25,500 60 15.08 5.5 14.3 80
25 25 CRS17-2502 12.0 1.5 17.5 17,300 25 38.53 5.9 8.0 87
CRS12-1503
φ[mm]
12
Length [mm]
15
Nominal Voltage [V]
7.4
shaft Φ [mm]
1.0
Output [W]
4.3
No-load : Speed [rpm]
37,100
No-load : Current [mA]
63
Stall : Torque [mNm]
4.41
Stall : Current [A]
2.4
Mechanical time constant [ms]
18.9
Max efficiency[%]
71
CRS17-1502
φ[mm]
17
Length [mm]
15
Nominal Voltage [V]
7.4
shaft Φ [mm]
1.2
Output [W]
8.1
No-load : Speed [rpm]
23,900
No-load : Current [mA]
50
Stall : Torque [mNm]
12.95
Stall : Current [A]
4.4
Mechanical time constant [ms]
19.8
Max efficiency[%]
80
CRS17-1801
φ[mm]
17
Length [mm]
18
Nominal Voltage [V]
7.4
shaft Φ [mm]
1.2
Output [W]
10.1
No-load : Speed [rpm]
25,500
No-load : Current [mA]
60
Stall : Torque [mNm]
15.08
Stall : Current [A]
5.5
Mechanical time constant [ms]
14.3
Max efficiency[%]
80
CRS17-2502
φ[mm]
17
Length [mm]
18
Nominal Voltage [V]
12.0
shaft Φ [mm]
1.5
Output [W]
17.5
No-load : Speed [rpm]
17,300
No-load : Current [mA]
25
Stall : Torque [mNm]
38.53
Stall : Current [A]
5.9
Mechanical time constant [ms]
8.0
Max efficiency[%]
87

RC High Speed Response

φ[mm] Length [mm] Products Nominal Voltage
[V]
shaft
Φ
[mm]
Output
[W]
No load Stall Mechanical time constant [ms] Max efficiency
[%]
Speed
[rpm]
Current
[mA]
Torque
[mNm]
Current
[A]
12 15 CRR12-1504 7.4 1.0 3.3 37,700 64 3.29 1.9 15.0 66
17 15 CRR17-1502 7.4 1.2 5.6 23,800 50 8.90 3.1 14.8 76
17 18 CRR17-1802 7.4 1.2 7.1 24,600 51 11.06 3.9 11.6 79
CRR12-1504
φ[mm]
12
Length [mm]
15
電圧[V]
7.4
shaft Φ [mm]
1.0
Output [W]
3.3
No-load : Speed [rpm]
37,700
No-load : Current [mA]
64
Stall : Torque [mNm]
3.29
Stall : Current [A]
1.9
Mechanical time constant [ms]
15.0
Max efficiency[%]
66
CRR17-1502
φ[mm]
17
Length [mm]
15
Nominal Voltage [V]
7.4
shaft Φ [mm]
1.2
Output [W]
5.6
No-load : Speed [rpm]
23,800
No-load : Current [mA]
50
Stall : Torque [mNm]
8.90
Stall : Current [A]
3.1
Mechanical time constant [ms]
14.8
Max efficiency[%]
76
CRR17-1802
φ[mm]
17
Length [mm]
18
Nominal Voltage [V]
7.4
shaft Φ [mm]
1.2
Output [W]
7.1
No-load : Speed [rpm]
24,600
No-load : Current [mA]
51
Stall : Torque [mNm]
11.06
Stall : Current [A]
3.9
Mechanical time constant [ms]
11.6
Max efficiency[%]
79

Brushless Motor

RC Standard

φ[mm] Length [mm] Products Nominal Voltage [V] shaft
Φ
[mm]
Output [W] No load Stall Mechanical time constant [ms] Max efficiency
[%]
Speed
[rpm]
Current [mA] Torque
[mNm]
Current [A]
12 15 BRS12-1503 7.4 1.0 4.7 35,500 143 5.07 2.8 7.4 60
17 15 BRS17-1502 7.4 1.0 7.5 23,500 156 12.13 4.3 5.2 63
17 18 BRS17-1802 7.4 1.5 7.7 27,300 114 10.80 4.4 8.1 70
BRS12-1503
φ[mm]
12
Length [mm]
15
Nominal Voltage [V]
7.4
shaft Φ [mm]
1.0
Output [W]
4.7
No-load : Speed [rpm]
35,500
No-load : Current [mA]
143
Stall : Torque [mNm]
5.07
Stall : Current [A]
2.8
Mechanical time constant [ms]
7.4
Max efficiency[%]
60
BRS17-1502
φ[mm]
17
Length [mm]
15
Nominal Voltage [V]
7.4
shaft Φ [mm]
1.0
Output [W]
7.5
No-load : Speed [rpm]
23,500
No-load : Current [mA]
156
Stall : Torque [mNm]
12.13
Stall : Current [A]
4.3
Mechanical time constant [ms]
12.5
Max efficiency[%]
66
BRS17-1802
φ[mm]
17
Length [mm]
18
Nominal Voltage [V]
7.4
shaft Φ [mm]
1.5
Output [W]
7.7
No-load : Speed [rpm]
27,300
No-load : Current [mA]
114
Stall : Torque [mNm]
10.80
Stall : Current [A]
4.4
Mechanical time constant [ms]
8.1
Max efficiency[%]
70

RC High Speed Response

φ[mm] Length [mm] Products Nominal Voltage [V] shaft
Φ
[mm]
Output [W] No load Stall Mechanical time constant [ms] Max efficienc
y[%]
Speed
[rpm]
Current [mA] Torque
[mNm]
Current [A]
12 15 BRT12-1502 7.4 1.0 7.4 36,600 178 7.68 4.3 5.2 63
17 15 BRT17-1501 7.4 1.0 12.7 20,000 122 24.07 7.0 5.1 75
17 18 BRT17-18R8 7.4 1.5 15.4 25,500 249 23.09 8.8 10.1 69
BRT12-1502
φ[mm]
12
Length [mm]
15
Nominal Voltage [V]
7.4
shaft Φ [mm]
1.0
Output [W]
7.4
No-load : Speed [rpm]
36,600
No-load : Current [mA]
178
Stall : Torque [mNm]
7.68
Stall : Current [A]
4.3
Mechanical time constant [ms]
5.2
Max efficiency[%]
63
BRT17-1501
φ[mm]
17
Length [mm]
15
Nominal Voltage [V]
7.4
shaft Φ [mm]
1.0
Output [W]
12.7
No-load : Speed [rpm]
20,000
No-load : Current [mA]
122
Stall : Torque [mNm]
24.07
Stall : Current [A]
7.0
Mechanical time constant [ms]
5.1
Max efficiency[%]
75
BRT17-18R8
φ[mm]
17
Length [mm]
18
Nominal Voltage [V]
7.4
shaft Φ [mm]
1.5
Output [W]
7.7
No-load : Speed [rpm]
27,300
No-load : Current [mA]
114
Stall : Torque [mNm]
10.80
Stall : Current [A]
4.4
Mechanical time constant [ms]
8.1
Max efficiency[%]
70
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