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RC Servo Motor

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Specialized Model
   Uniqueness of Namiki Coreless DC Motor lies in its coil windings.
   RC servo motor pursued "high speed response" and "high output"
   with evolution of batteries.   

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.
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, 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.
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.

RC servo motor image
 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.

 
Brushed Motor

   RC Standard

 

Dia.
[mm]
Length
[mm]
Products
Nomi
nal
Vol
tage
[V]
Terminal
Resistance
[Ω]
No-load
Stall
Mecha
nical
time
cons
tant
[ms]
Max.
output
power
[W]
Max.
effic
iency
[%]
Speed
[rpm]
Cur
revt
[mA]
Tor
eque
[mNm]
Cur
rent
[A]
12
15
7.4
3.0
36,200
59
4.6
2.5
12.5
4.3
71
17
15
7.4
1.6
23,400
43
13.6
4.6
16.6
8.4
82
17
18
7.4
1.3
25,500
60
15.2
5.6
12.0
10.2
80

 

   RC High Speed Response

 

Dia.
[mm]
Length
[mm]
Products
Nomi
nal
Vol
tage
[V]
Terminal
Resistance
[Ω]
No-load
Stall
Mecha
nical
time
cons
tant
[ms]
Max.
output
power
[W]
Max.
effic
iency
[%]
Speed
[rpm]
Cur
revt
[mA]
Tor
eque
[mNm]
Cur
rent
[A]
12
15
7.4
3.8
37,800
63
3.4
2.0
9.4
3.4
67
17
15
7.4
2.3
23,900
41
9.1
3.2
12.3
5.7
78
17
18
7.4
2.1
23,400
46
10.7
3.6
9.3
6.5
79

 

 

Brushless Motor

   RC Standard

 

Dia.
[mm]
Length
[mm]
Products
Nomi
nal
Vol
tage
[V]
Terminal
Resistance
[Ω]
No-load
Stall
Mecha
nical
time
cons
tant
[ms]
Max.
output
power
[W]
Max.
effic
iency
[%]
Speed
[rpm]
Cur
revt
[mA]
Tor
eque
[mNm]
Cur
rent
[A]
12
15
7.4
2.6
36,000
150
5.1
2.8
7.4
4.7
59
17
15
7.4
1.7
23,500
160
12.1
4.3
11.5
7.5
65
17
18
7.4
1.7
27,300
120
10.8
4.4
8.1
7.7
70

 

  RC High Speed Response

 

Dia.
[mm]
Length
[mm]
Products
Nomi
nal
Vol
tage
[V]
Terminal
Resistance
[Ω]
No-load
Stall
Mecha
nical
time
cons
tant
[ms]
Max.
output
power
[W]
Max.
effic
iency
[%]
Speed
[rpm]
Cur
revt
[mA]
Tor
eque
[mNm]
Cur
rent
[A]
12
15
7.4
1.7
36,900
180
7.7
4.3
5.2
7.4
63
17
15
7.4
1.0
20,000
120
24.0
7.1
5.1
12.7
76
17
18
7.4
0.8
25,500
250
23.1
8.8
10.1
15.4
69
 
Product Inquiry

 

 

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