The output shaft rotates in about half of a circle, or 180 degrees. It has physical stops placed in the gear mechanism to prevent turning beyond these limits to protect the rotational sensor.

The angle (of mechanical rotation) is determined by the width of an electrical pulse that is applied to the control wire. This is a form of pulse width modulation (PWM), however servo position is not defined by the PWM duty cycle (i.e., ON vs OFF time) but only by the width of the pulse. The width of the pulse will determine how far the motor turns. For example, a 1500 us (1.5 ms) pulse will make the motor turn to the 90 degree position (neutral position).

PWM width increasing results in counterclockwise rotation, while PWM width decreasing results in clockwise rotation.


SM-0090 servo motor have three wires: black, red and white.

  • black = ground (GND, battery negative terminal)
  • red = servo power (Vservo, battery positive terminal)
  • white = servo control signal line


Set contains:

     1x RC servo motor SM-0090

     4x Metal sleeve

     4x Rubber

     4x M2.5 screw and nut

     1x Servo shaft A

     1x Servo shaft B

     1x Screw for shaft


Motor
Communication Pulse-width modulation (PWM)
Operating Voltage range 4.8 - 7.4 V
Speed @ 5V (no load) 0.23 sec/60°
Speed @ 6V (no load) 0.16 sec/60°
Speed @ 7.4V (no load) 0.14 sec/60°
Stall torque @ 5V (locked) 8 kg•cm
Stall torque @ 6V (locked) 9 kg•cm
Stall torque @ 7.4V (locked) 10 kg•cm
Idle current @ 6V (at stopped) 10 mA
Idle current @ 7.4 V (at stopped) 10 mA
Operating travel 90° ± 10°
Running current @ 6V (at no load) 400 mA
Running current @ 7.4 V (at no load) 500 mA
Stall current @ 6V 2.3 A
Stall current @ 7.4V 2.5 A
PWM width range 800 - 2200 us
Neutral position 1500 ± 50 usec
Clockwise rotation When PWM width decreasing (eg 1400 -> 1000)
Counter Clockwise rotation When PWM width increasing (eg 1300 -> 1700)
Dead band width 4 us
Centering deviation ≤ 1°
Left & Right travelling Angle deviation ≤ 3°
Limit angle 180° ± 10°
Maximum travel About 125° (800->2200 usec)
Bearing Ball Bearing
Gear Material Metal
Output Gear 25 T/diam. 5.80
Connector wire length 30 cm
Dimensions 40.8 x 20.1 x 38 mm (See drawings)
Weight 57 g

Positional Servo Motor SM-0090

  • Brand: EMoRo
  • Product Code: SM-0090
  • Availability: In Stock
  • $15.00

  • Incl. Tax: $15.00

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