Basics of Measurement and Control Technology

System

This trainer enables the study of the fundamentals of control engineering using a servo drive system consisting of a DC motor, various sensors and analogue and digital controllers. Learners are also introduced to the basics of transducers and signal processing. The syllabus is divided into 24 tasks ranging from simple control concepts to advanced topics such as transfer function analysis.

Functions

The product utilises Espial software (sold separately) where each task is based on clear objectives, background, theory and experiment. All necessary test instruments are included in the software and include four-channel real-time data recording and bar graph display, voltmeter, frequency counter and transfer function analysis with Bode and Nyquist indicators.

The system consists of three elements: the mechanical device, the electronic device and a power supply. The mechanical device is set up as a circuit board with a servo drive and auxiliary electronics. It contains a power amplifier that drives a DC motor connected to a series of converters and an eddy current brake. The digital encoders are pin-type so that their function can be checked visually. A dual-function LCD measuring device measures either the voltages or the rotational speed. The electronic device consists of a circuit board with a dummy diagram on the front. It contains processing blocks for analogue signals, an embedded controller with USB interface, analogue-to-digital converter, PWM drive and the instrument data converters. A full block diagram is located on the front panel with access via 2 mm sockets to quickly configure each and connect the instrument blocks. LEDs indicate the output signals of the digital encoders. A function generator block is available with sine, square and triangle output signals.

Method

The equipment is equally suitable for demonstrations and student experiments. Experimental procedures are carried out using an electronic manual in ESPIAL.

Target groups

Vocational training in electrical engineering in trade and industry and students specialising in automation technology and mechatronics. The course offers both introductory courses at a basic level and challenging topics for bachelor's programmes.

Themes

• Operational amplifier
• Analogue converters
• Motor and eddy current properties
• Positive and negative feedback
• Rise and stability
• Speed feedback
• Consequential error
• System time constant
• Control loop position and speed control
• Analogue controller (PID)
• Control with feedforward control
• Analogue and digital conversion
• Digital speed and position measurement
• Absolute and incremental encoders
• Digital controllers
• Transfer function analysis
• Idle/control loop transfer functions