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Operating
Voltage
(volts)
9g
Continuous
Rotation
Micro Servo
HS-422
Servo
Motor
RF-020TH
Operating
Current
(amperes)
Speed
(rpm)
Torque
(oz . in)
Price
4.8 – 6
Not Given
83.3
18.9
$4.99
4.8 – 6
0.150
62.5
57
$9.99
2–5
0.184
9580
0.222
$1.29
16.66
$9.99
HS-55 Sub4.8 – 6
0.150
71.4
Micro
Table 4.2 Comparison of different servo motors.
Table 4.3 compares the features of several brushless DC motors. The RC-260RA2670 motor has the most torque and the highest speed. Its operating voltage range
is within that of the HS-422 servo motor, making it possible to use the same voltage
regulator for both motors. It is small enough to fit comfortably inside of Puppy Pal
and not get in the way of the servo motor. The addition of a gearbox would
decrease the speed of the motor, but step up the torque. The main drawback of
this motor is its operating current. The current it draws is almost ten times greater
than that of its counterparts. Such a difference in power is not worth the greater
torque or speed. The RP6858 has an acceptable speed and operating current.
Although it is larger than the other motors, it would still fit inside of Puppy Pal. Its
supply voltage can be varied based on what works best in the testing stage. To
begin with, 12V will be used. The torque will be measured during initial testing.
RC260RA2670
RF-500TB18280-R
ST13012240-38
Operating
Voltage
(volts)
Operating
Current
(amperes)
Speed
(rpm)
Torque
(oz . in)
Price
3–6
1.43
15290
0.303
$2.75
1–3
0.175
2700
0.186
$2.25
1.5 – 3
0.170
3588
0.103
$2.49
Not Given
$5.95
2500 (6V)
5430 (12V)
Table 4.3 Comparison of different DC motors.
RP6858
6 – 24
0.180
54