QNET 2.0 DC Motor Board

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Introduce Students to Controls Fundamentals

The Quanser QNET 2.0 DC Motor Board is a versatile servo system designed to teach and demonstrate the fundamentals of motor servo control in a variety of ways. Designed exclusively for NI ELVIS platform and LabVIEW™ software, the system can easily be configured to control motor position and speed. Students learn how to:

  • model a DC motor experimentally
  • design and implement a proportional-integral (PI) controller to control the speed of a motor
  • design and implement a proportional-derivative (PD) controller to control the position of a motor
  • design and implement a proportional-integral-derivative (PID) controller for tracking error and disturbance rejection

How It Works

The QNET 2.0 DC Motor Board provides an integrated amplifier and a communication interface with the NI ELVIS II(+), interfaced to a PC or laptop via USB link.

The QNET 2.0 DC Motor Board consists of a direct-drive motor with a single-ended rotary encoder measuring the angular position of the motor, and an inertia disk on the motor shaft. The inertia disk can be easily attached using magnetic connector. The motor is driven using a pulse-width modulated (PWM) power amplifier. Signals to and from the system are available on a header and on standard connectors for control via a Data Acquisition (DAQ) card. The control variable is the voltage to the drive amplifier of the system and the output is either the inertia disk speed or the angle of the inertia disk. Disturbances can be introduced manually by manipulating the wheel or digitally through LabVIEW™.

The QNET 2.0 DC Motor Board is fitted with a variety of safety measures to ensure proper system configuration. Status LEDs provide feedback to users.

Comprehensive Resources and ABET-aligned Courseware Included

The QNET 2.0 DC Motor Board comes with comprehensive digital resources developed by Quanser to enhance teaching controls. These resources save professors’ time, while helping students quickly grasp the capabilities of the board, relate the studied control concepts to applications in real world and understand the exercises performed in lab. The resources include:

  • ABET-aligned courseware with in-lab exercises
  • detailed ABET assessment guidelines and scoring sheets
  • setup materials, including Quick Start Guides, User Manual and VIs for the trainer ensure faster, easier setup of the experiment
  • pre-designed VIs help students understand how the theoretical block diagrams relates to the actual implementation

  • Compact rotary servo system for NI ELVIS II(+)
  • Plug-and-play design for quick and easy lab setup
  • Removable inertia disk
  • Durable DC servo motor with no cogging
  • Built-in PWM amplifier with linear response
  • High resolution optical encoder to sense position
  • Hardware velocity measurement
  • Comprehensive digital resources and ABET-aligned courseware included
  • Fully compatible with LabVIEW™
  • Fully documented system models and parameters provided for LabVIEW™
Motor nominal input voltage 18.0 V
Motor nominal speed 3050 RPM
Motor torque constant 0.042 Nm/A
Motor terminal resistance 8.4 Ω
Rotor inertia of the motor 4.0 x 10-6 kg.m²
Encoder line count 512 lines/rev
Encoder line count in quadrature 2048 lines/rev
Encoder resolution (in quadrature) 0.176 deg/count
Amplifier type PWM
Amplifier peak current 2.5 A
Amplifier continuous current 0.5 A
Amplifier output voltage ± 24 V with 42% duty cycle limit (± 10 V)

Topics covered in the Quanser-developed courseware:

  • System modeling and model validation
  • Speed and position control
  • System simulation
  • PID control
  • Error tracking
  • Disturbance rejection
The QNET 2.0 DC Motor Board can be also used to teach other topics that are not included in the Quanser-developed courseware.

To set up your QNET 2.0 DC Motor Board, you need NI ELVIS II(+) Modular Engineering Education Laboratory Platform.

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