The Rotary Servo Base Unit is a geared servo-mechanism system. The plant consists of a DC motor in a solid aluminum frame. This DC motor drives the smaller pinion gear through an internal gear box. The pinion gear is fixed to a larger middle gear that rotates on the load shaft. The position of the load shaft can be measured using a high resolution optical encoder or a potentiometer. The encoder is also used to estimate the speed of the motor.

  • High-quality DC servo motor and gearbox
  • High-resolution optical encoder to sense position and estimate motor speed
  • Continuous turn potentiometer to sense position
  • Variable loads and gear ratios
  • Optional slip ring for continuous measurement from instrumented modules
  • Ten add-on modules available
Modeling Topics
  • First-principles derivation
  • Experimental derivation
  • Transfer function representation
  • Frequency response representation
  • Model validation
Control Topics
  • PID
  • Lead Compensator

The following additional components are required to complete your workstation, and are sold separately:

For Simulink

  • QUARC® add-on for MATLAB®/Simulink®
  • Quanser VoltPAQ-X1 linear voltage amplifier
  • One of the following DAQ devices:
    • Quanser Q2-USB
    • Quanser Q8-USB
    • Quanser QPIDe


  • Quanser Rapid Control Prototyping (Q-RCP) Toolkit® add-on for NI LabVIEW™
  • Quanser VoltPAQ-X1 linear voltage amplifier
  • One of the following DAQ devices:
    • NI CompactRIO with Quanser Q1-cRIO
    • NI myRIO with Quanser Terminal Board
    • Quanser Q2-USB
    • Quanser Q8-USB
    • Quanser QPIDe

Product Details

Plant dimensions (L x W x H) 15 cm x 15 cm x 18 cm
Plant mass 1.2 kg
Motor nominal input voltage 6 V
Motor maximum continuous current (recommended) 1 A
Motor maximum speed (recommended) 6,000 RPM
Potentiometer bias power ±12 V
Potentiometer measurement range ±5 V
Encoder resolution (in quadrature) 4096 counts/rev

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