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Servo Motor

Testing Systems for Servo Motors

A Servo Motor includes a closed-loop servomechanism that uses position feedback to control its motions and final position. The input to its control is a signal (either analog or digital) representing the position commanded for the output shaft.

Servo Motors are used in many different applications that require high-precision positioning, such as airplanes (to position control surfaces and rudders), elevators, robotics (walking and production), operating grippers, and many more.

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Maximizing Precision

Leveraging Motomea for Servo Motor Testing

The Motomea Regenerative Dynamometer System (Motomea RDS) enables:

  • Complete load performance testing:
    • Torque, Speed, Current, Efficiency, Power Input, Power Output.
  • Standard electrical parameters testing:
    • HV, Vibration, Noise, and others.
  • Additional testing:
    • Cogging, Back EMF, Friction, Friction Spectrum, Ripple Torque.
  • Automatic temperature rise test:
    • Thermocouple and/or PT100 device with 2 to 16 channels for Current, Voltage, Speed, Torque, Power Input, Power Output, all synchronized to each temperature reading.
  • Electric Motorcycle/Scooter Motor Drive Cycle Load Simulation:
    • Real-time simulation with acceleration, braking, change of vehicle states.
  • Battery Simulation:
    • Battery cycle testing (Charge/Discharge).
    • Battery SOC (State Of Charge) script.
    • Battery SOD (State Of Discharge) script.
    • Special feature: Low voltage dip at current transient.
    • System includes Output Filter with high capacitance
    • Testing at U mode: Voltage Control (CV).
  • Battery Testing:
    • I+ mode: Current Control (CC+).
    • I- mode: Current Control (CC-).
    • P mode: Power Control (CP), CC-CV, Step for cut-off condition (ET, EV, EC, CC time, CV time, Cap%, etc.).
    • Protection (OV & LV, OC & LC, OT).
  • Additional EM Tests:
    • Performance Generating Mode & Performance Motoring Mode.
    • Stall Torque, Cogging Torque.
    • Back EMF RMS, Open Circuit Back EMF, Back EMF Constant KE.
    • No Load Coupled & Uncoupled.
    • Torque Ripple Measurements at Low RPM & at High RPM.
    • Electromechanical Time Constant.
    • Voltage and Current Harmonics.
    • Load from Excel File.
    • Speed Torque Scope Viewer.
    • Deceleration Test (MOI Calculation).
    • Servo Bandwidth (Speed Loop & Current Loop).
    • Dynamic Testing during acceleration and deceleration.
    • Friction vs. Speed, Friction Drag Torque.
    • Torque Speed FFT.
    • Performance at Variable Voltage.
    • Inductance Test 3 Phases.
    • Vibration.
    • ISG Tests: Generation Characteristic.
    • ISO Efficiency Tests: ISO Efficiency and ISO Efficiency Contour.
    • S1 to S8 – IEC duty cycles of operation for electrical motors.


Servo Motor Characteristics

Advantages

  • Excel at position and speed control.
  • High output power relative to motor size and weight.
  • Encoder determines accuracy and resolution.
  • High efficiency. It can approach 90% at light loads.
  • High torque to inertia ratio. Servo Motors can rapidly accelerate loads.
  • Achieve high speeds at high torque values.
  • Quiet at high speeds.

 

Disadvantages

  • Requires tuning to stabilize the feedback loop.
  • Will become unpredictable when something breaks, so safety circuits are required.
  • Complex controller requires encoder and electronic support.
  • Peak torque is limited to a 1% duty cycle. Servo Motors can be damaged by sustained overload.
  • Gear boxes are often required to deliver power at higher speeds.
  • Higher overall system cost and the installation cost of a Servo Motor system may be higher than that of a stepper motor due to the requirement for feedback components. 

See how we test a Servo Motor

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WHY IS IT CRITICAL TO TEST Servo MotorS?

  1. Performance Assurance: Ensures servo motors meet speed, torque, and accuracy specifications.
  2. Quality Control: Identifies manufacturing defects or deviations early in production.
  3. Safety: Reduces risks of accidents or equipment damage.
  4. Optimization: Provides data for design efficiency and longevity.
  5. Customer Satisfaction: Builds trust and enhances reputation.
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