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
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 @ 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)
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

Set contains:

      1x Positional servo motor SM-0090

      1x Spear

      1x Servo holder

      2x M3 screw and T-nut

      4x Rubber and metal sleeve

      4x M2.5 screw and nut

      1x Servo shaft and screw



Alkar SET

  • Brand: EMoRo
  • Product Code: Alkar set
  • Availability: In Stock
  • $22.00

  • Incl. Tax: $22.00

Related Products

EMoRo Basic Robot kit

EMoRo Basic Robot kit

Designed to encourage logical thinking and technical curiosity in a fun, engaging way, the EMoRo R..

$145.00 Incl. Tax: $145.00

EMoRo 2560 controller

EMoRo 2560 controller

The EMoRo 2560 is the first Arduino compatible controller with CE certification. Built around an AT..

$48.00 Incl. Tax: $48.00

EMoRo Pro Robot kit

EMoRo Pro Robot kit

 Designed to encourage logical thinking and technical curiosity in a fun, engaging way, the E..

$185.00 Incl. Tax: $185.00

EMoRo Advanced Robot kit

EMoRo Advanced Robot kit

Designed to encourage logical thinking and technical curiosity in a fun, engaging way, the EMoRo R..

$177.00 Incl. Tax: $177.00

Continuous rotation Servo Motor RM-0090

Continuous rotation Servo Motor RM-0090

The RM-0090 is RC servo motor with bidirectional continuous rotation and linear response to PWM. Th..

$15.00 Incl. Tax: $15.00

Positional Servo Motor SM-0090

Positional Servo Motor SM-0090

The output shaft rotates in about half of a circle, or 180 degrees. It has physical stops placed in..

$15.00 Incl. Tax: $15.00

EMoRo Alka Knight

EMoRo Alka Knight

The kit is designed for those with the competitive spirit. Users can control the Alka Knight robot ..

$233.00 Incl. Tax: $233.00

RC servo drive pack

RC servo drive pack

RC servo drive pack contains two servomotors RM-0090 and accessories for mounting servos on the chas..

$34.00 Incl. Tax: $34.00

Tags: Alkar, servo motor, positional, servo, motor,