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

Dia.
[mm]
Length
[mm]
Products Nominal
Voltage
[V]
Terminal
Resistance
[Ω]
No-load Stall Mechanical
time
constant
[ms]
Max.
output
power
[W]
Max.
efficiency
[%]
Speed
[rpm]
Current
[mA]
Toreque
[mNm]
Current
[mA]
12 15 CRS12-1503 7.4 3.0 36,200 59 4.6 2.5 12.5 4.3 71
17 15 CRS17-1502 7.4 1.6 23,400 43 13.6 4.6 16.6 8.4 82
17 18 CRS17-1801 7.4 1.3 25,500 60 15.2 5.6 12.0 10.2 80
CRS12-1503
Dia.[mm]
12
Length[mm]
15
Nominal Voltage[V]
7.4
Terminal Resistance [Ω]
3.0
No-load:Speed[rpm]
36,200
No-load:Current[mA]
59
Stall:Toreque[mNm]
4.6
Stall:Current[mA]
2.5
Mechanical time constant[ms]
12.5
Max. output power[W]
4.3
Max. efficiency[%]
71
CRS17-1502
Dia.[mm]
17
Length[mm]
15
Nominal Voltage[V]
7.4
Terminal Resistance [Ω]
1.6
No-load:Speed[rpm]
23,400
No-load:Current[mA]
43
Stall:Toreque[mNm]
13.6
Stall:Current[mA]
4.6
Mechanical time constant[ms]
16.6
Max. output power[W]
8.4
Max. efficiency[%]
82
CRS17-1801
Dia.[mm]
17
Length[mm]
18
Nominal Voltage[V]
7.4
Terminal Resistance [Ω]
1.3
No-load:Speed[rpm]
25,500
No-load:Current[mA]
60
Stall:Toreque[mNm]
15.2
Stall:Current[mA]
5.6
Mechanical time constant[ms]
12.0
Max. output power[W]
10.2
Max. efficiency[%]
80

RC High Speed Response

Dia.
[mm]
Length
[mm]
Products Nominal
Voltage
[V]
Terminal
Resistance
[Ω]
No-load Stall Mechanical
time
constant
[ms]
Max.
output
power
[W]
Max.
efficiency
[%]
Speed
[rpm]
Current
[mA]
Toreque
[mNm]
Current
[mA]
12 15 CRR12-1504 7.4 3.8 37,800 63 3.4 2.0 9.4 3.4 67
17 15 CRR17-1502 7.4 2.3 23,900 41 9.1 3.2 12.3 5.7 78
17 18 CRR17-1802 7.4 2.1 23,400 46 10.7 3.6 9.3 6.5 79
CRR12-1504
Dia.[mm]
12
Length[mm]
15
Nominal Voltage[V]
7.4
Terminal Resistance [Ω]
3.8
No-load:Speed[rpm]
37,800
No-load:Current[mA]
63
Stall:Toreque[mNm]
3.4
Stall:Current[mA]
2.0
Mechanical time constant[ms]
9.4
Max. output power[W]
3.4
Max. efficiency[%]
67
CRR17-1502
Dia.[mm]
17
Length[mm]
15
Nominal Voltage[V]
7.4
Terminal Resistance [Ω]
2.3
No-load:Speed[rpm]
23,900
No-load:Current[mA]
41
Stall:Toreque[mNm]
9.1
Stall:Current[mA]
3.2
Mechanical time constant[ms]
12.3
Max. output power[W]
5.7
Max. efficiency[%]
78
CRR17-1802
Dia.[mm]
17
Length[mm]
18
Nominal Voltage[V]
7.4
Terminal Resistance [Ω]
2.1
No-load:Speed[rpm]
23,400
No-load:Current[mA]
46
Stall:Toreque[mNm]
10.7
Stall:Current[mA]
3.6
Mechanical time constant[ms]
9.3
Max. output power[W]
6.5
Max. efficiency[%]
79

Brushless Motor

RC Standard

Dia.
[mm]
Length
[mm]
Products Nominal
Voltage
[V]
Terminal
Resistance
[Ω]
No-load Stall Mechanical
time
constant
[ms]
Max.
output
power
[W]
Max.
efficiency
[%]
Speed
[rpm]
Current
[mA]
Toreque
[mNm]
Current
[mA]
12 15 BRS12-1503 7.4 2.6 36,000 150 5.1 2.8 7.4 4.7 59
17 15 BRS17-1502 7.4 1.7 23,500 160 12.1 4.3 11.5 7.5 65
17 18 BRS17-1802 7.4 1.7 27,300 120 10.8 4.4 8.1 7.7 70
BRS12-1503
Dia.[mm]
12
Length[mm]
15
Nominal Voltage[V]
7.4
Terminal Resistance [Ω]
2.6
No-load:Speed[rpm]
36,000
No-load:Current[mA]
150
Stall:Toreque[mNm]
5.1
Stall:Current[mA]
2.8
Mechanical time constant[ms]
7.4
Max. output power[W]
4.7
Max. efficiency[%]
59
BRS17-1502
Dia.[mm]
17
Length[mm]
15
Nominal Voltage[V]
7.4
Terminal Resistance [Ω]
1.7
No-load:Speed[rpm]
23,500
No-load:Current[mA]
160
Stall:Toreque[mNm]
12.1
Stall:Current[mA]
4.3
Mechanical time constant[ms]
11.5
Max. output power[W]
7.5
Max. efficiency[%]
65
BRS17-1802
Dia.[mm]
17
Length[mm]
18
Nominal Voltage[V]
7.4
Terminal Resistance [Ω]
1.7
No-load:Speed[rpm]
27,300
No-load:Current[mA]
120
Stall:Toreque[mNm]
10.8
Stall:Current[mA]
4.4
Mechanical time constant[ms]
8.1
Max. output power[W]
7.7
Max. efficiency[%]
70

RC High Speed Response

Dia.
[mm]
Length
[mm]
Products Nominal
Voltage
[V]
Terminal
Resistance
[Ω]
No-load Stall Mechanical
time
constant
[ms]
Max.
output
power
[W]
Max.
efficiency
[%]
Speed
[rpm]
Current
[mA]
Toreque
[mNm]
Current
[mA]
12 15 BRT12-1502 7.4 1.7 36,900 180 7.7 4.3 5.2 7.4 63
17 15 BRT17-1501 7.4 1.0 20,000 120 24.0 7.1 5.1 12.7 76
17 18 BRT17-18R8 7.4 0.8 25,500 250 23.1 8.8 10.1 15.4 69
BRT12-1502
Dia.[mm]
12
Length[mm]
15
Nominal Voltage[V]
7.4
Terminal Resistance [Ω]
1.7
No-load:Speed[rpm]
36,900
No-load:Current[mA]
180
Stall:Toreque[mNm]
7.7
Stall:Current[mA]
4.3
Mechanical time constant[ms]
5.2
Max. output power[W]
7.4
Max. efficiency[%]
63
BRT17-1501
Dia.[mm]
17
Length[mm]
15
Nominal Voltage[V]
7.4
Terminal Resistance [Ω]
1.0
No-load:Speed[rpm]
20,000
No-load:Current[mA]
120
Stall:Toreque[mNm]
24.0
Stall:Current[mA]
7.1
Mechanical time constant[ms]
5.1
Max. output power[W]
12.7
Max. efficiency[%]
76
BRT17-18R8
Dia.[mm]
17
Length[mm]
18
Nominal Voltage[V]
7.4
Terminal Resistance [Ω]
0.8
No-load:Speed[rpm]
25,500
No-load:Current[mA]
250
Stall:Toreque[mNm]
23.1
Stall:Current[mA]
8.8
Mechanical time constant[ms]
10.1
Max. output power[W]
15.4
Max. efficiency[%]
69

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