This trainer allows the investigation of control system principles by using a servo mechanism comprising a dc motor, a variety of sensors and both analogue and digital controllers. Students are also introduced to the fundamentals of transducers and signal processing. Prior knowledge of very basic electronics is assumed as well as simple mathematics although the use of mathematics is minimised as much as practicable.
The curriculum is divided into twenty four assignments ranging from basic control concepts to more advanced topics such as transfer function analysis. Selective use of the available assignments allows the trainer to be used from vocational through to higher technician and undergraduate courses.
This product uses Espial Software in which each assignment comprises clear objectives, background and theory information and up to four practical exercises. These exercises contain graphical connection diagrams for the hardware and step by step practical instructions. All required test instrumentation is provided within the software.
The instrumentation includes: Four channel real-time data logger and bar-graph display; Voltmeter; Frequency counter Transfer function analyser with Bode and Nyquist displays; All instrumentation includes the ability to make accurate measurements using cursors as well as to print and save the displays for inclusion in student reports. A hard copy of all the curriculum material is also provided.
As an option the Espial Tools software package may be purchased. This allows the existing teaching content to be modified as well as the creation of new material. This product is compatible with Espial Course Designer and Presenter that allows custom courses to be developed containing assignments from any installed Espial product and external resources.
The system comprises three items; Mechanical plant, Electronic unit and Power supply.
The mechanical unit contains a power amplifier driving a dc motor connected to a set of transducers and an adjustable eddy current brake. The digital encoders are of open construction to allow visual inspection of their functionality. A calibrated precision input potentiometer is also available. A dual function lcd meter measures either voltages or rotation speed. Internal test signals are available to provide easy functional checks.
The electronic board contains analogue signal processing blocks, an embedded controller with usb interface, analogue to digital converters, pwm drive and the instrumentation data converters. A complete block diagram is on the front panel of the unit with access via 2mm sockets to allow each practical to be configured rapidly and the instrumentation blocks connected. Leds show the output signals from the digital encoders. A function generator block is provided with sine, square and triangle output signals.
The power supply provides all the voltages required for both the motor and the control system and is connected directly to the mechanical plant. A ribbon cable connects the mechanical unit to the electronic unit.
A single USB cable connects the electronic unit to the pc.
- Teaches the concepts of control, sensors and signal processing
- Real mechanical plant
- Suitable for teaching both theory and practice
- Contains both analogue and digital controllers
- Compares digital and analogue sensors
- Digital controller uses an embedded processor
- Linear and pwm motor drive
- On-board sine, square and triangle wave generator
- Espial software with built-in instrumentation
- Open and closed loop transfer functions with Bode and Nyquist displays
- Complete workstation including power supply
- Operational Amplifiers
- Analogue Transducers
- Motor and Eddy Current Brake
- Positive and Negative Feedback
- Gain and Stability
- Velocity Feedback
- Following Error
- System Time Constant
- Closed Loop Position and Speed Control
- Analogue Controllers (PID)
- Feed-Forward Systems
- Analogue to Digital Conversion
- Digital Speed and Position Measurement
- Absolute and Incremental Encoders
- Digital Controllers
- Open and Closed Loop Transfer Functions