Servo Motor
Testing Systems for Servo Motors
A Servo Motor is a closed-loop servomechanism that uses position feedback (like encoder) to control its motion 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 radio-controlled airplanes to position control surfaces like elevators, rudders, walking a robot, or operating grippers.
Servo Motor
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.
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, Torque Ripple.
- 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
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.
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, Torque Ripple.
- 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.
See how we test a Servo Motor
WHY IS IT CRITICAL TO TEST Servo MotorS?
- Performance Assurance: Ensures servo motors meet speed, torque, and accuracy specifications.
- Quality Control: Identifies manufacturing defects or deviations early in production.
- Safety: Reduces risks of accidents or equipment damage.
- Optimization: Provides data for design efficiency and longevity.
- Customer Satisfaction: Builds trust and enhances reputation.
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