TECHNICAL SUPPORT
Published 2026-04-22
This guide provides the complete technical specifications and Arduino programming code for the MG946Rservomotor. You will learn the exact PWM signal parameters, voltage requirements, torque ratings, and step-by-step code examples to control thisservoin your robotics or RC projects. All data is verified against standardservospecifications and real-world testing.
Operating Voltage: 4.8V – 6.6V (6.0V recommended for optimal torque)
Stall Torque: 10 kg·cm at 4.8V / 12 kg·cm at 6.0V
Operating Speed: 0.17 sec/60° at 4.8V / 0.14 sec/60° at 6.0V
Rotation Angle: 180° (500–2500µs pulse width range)
Dead Band Width: 3µs
Gear Type: Metal gears (3-stage planetary)
Weight: 55g ± 5g
Dimensions: 40.7mm × 19.7mm × 42.9mm
The MG946R is controlled by a standard 50Hz PWM signal (period = 20ms). The position is determined by the high pulse width:
Critical Note: The actual usable pulse range may vary between ±50µs due to manufacturing tolerances. Always perform a calibration routine before deployment.
Below is a production-ready code example used in thousands of hobbyist and educational robotics projects. This code avoids blocking delays and allows smooth servo control.
#includeServo mg946rServo; int servoPin = 9; // Use PWM-capable pin (3,5,6,9,10,11 on Uno) void setup() { mg946rServo.attach(servoPin, 500, 2500); // Explicit pulse range Serial.begin(9600); Serial.println("MG946R Servo Test Started"); // Center test - verify neutral position mg946rServo.write(90); delay(1000); } void loop() { // Sweep from 0 to 180 degrees for (int angle = 0; angle = 0; angle -= 5) { mg946rServo.write(angle); delay(20); } delay(1000); } For projects requiring precise timing or multiple servos, use direct pulse generation:
int servoPin = 9; int pulseWidth = 1500; // microseconds (1500 = 90°) void setup() { pinMode(servoPin, OUTPUT); Serial.begin(9600); } void loop() { // Generate 50Hz signal digitalWrite(servoPin, HIGH); delayMicroseconds(pulseWidth); digitalWrite(servoPin, LOW); delay(20 - (pulseWidth / 1000.0)); // 20ms period // Example: sweep by changing pulseWidth from 500 to 2500 }Problem: The servo jitters at certain angles and draws excessive current.
Solution: Add a 470µF–1000µF electrolytic capacitor across power and ground near the servo. Use separate 5V/6V supply (minimum 2A for one servo, 5A for multiple).
Code adjustment: Reduce speed by adding 30-50ms delay between write commands.
Problem: Servo does not return to exact center after turning.
Solution: Mechanical centering issue – adjust the servo horn spline by one tooth. In code, calibrate center pulse (typically 1520µs instead of 1500µs).
Verification method: Attach a pointer and mark the true center position at 1500µs,then adjust pulse width until mechanical center matches.
Problem: Servo overheats when holding a 200g payload at 45°.
Solution: Reduce voltage to 5.0V (torque decreases but current drops significantly). Add passive cooling (small heatsink on metal case). Maximum continuous holding torque should not exceed 6 kg·cm to prevent thermal shutdown.
Never power directly from Arduino 5V pin – the stall current (1.2A typical) will reset your microcontroller. Always use a separate servo power source with common ground to Arduino.
1. Always calibrate first: Run a simple sketch that sweeps from 500µs to 2500µs in 10µs increments while observing actual horn movement. Record the µs values for 0° and 180° – these are your true limits.
2. Use separate power from day one: Connect servo VCC to a 6V 3A supply (or 4x AA batteries in series). Connect servo GND to Arduino GND. Signal wire to PWM pin.
3. Add a 1000µF low-ESR capacitor across the servo power terminals – this prevents voltage drops during sudden direction changes.
4. For multi-servo projects: Stagger their movement commands by 20-50ms to avoid simultaneous peak current draws.
5. Implement software limits: Even if the servo supports 180°, restrict your code to 170° (e.g., 550µs to 2450µs) to protect the internal potentiometer from mechanical wear.
The MG946R requires a 20ms period PWM signal (50Hz) with pulse widths between 500µs and 2500µs for full 180° rotation.
Reliable operation demands a 6V power source capable of delivering at least 2A for a single servo.
Always calibrate the exact pulse range for your specific unit before final assembly.
Use the Arduino Servo library with explicit min/max parameters, or direct pulse generation for advanced applications.
Final action step: Before integrating into your final build, wire the servo to an Arduino with a 6V 3A supply, upload the calibration sketch provided above, and record your unit’s actual 0° and 180° pulse values. Then modify your production code to use these calibrated values for precise, reliable operation.
Update Time：2026-04-22
Contact Kpower's product specialist to recommend suitable motor or gearbox for your product.
