Modular Servo Systems

System

The modular servo system enables students to study the theory and practice of automatic control systems. It provides an introduction to modern circuits and design techniques. The system is modular and therefore versatile. Each unit is equipped with a magnetic base that fixes the device to the plastic-coated steel base plate, regardless of the angle at which the base plate is positioned. The individual units can be arranged as in a block diagram. Connections between the units are realised using 4 mm experiment cables. The modular concept of the MS150 system allows the investigation of individual units and, by combining them, the investigation and performance testing of complete systems. A series of manuals are available for course design.

Method

The equipment includes student experiments in the laboratory with non-hazardous low voltage. Experimental procedures are carried out using a manual in printed or electronic form.

Target group

An internship aimed at further education programmes at technical colleges and technical universities.

Previous knowledge

• Knowledge of classical control engineering.

Themes

• Operational amplifier
• Characteristics of the motor
• Direct current error channel
• Simple position control
• Position control
• Simple speed control
• Dead zone & step response
• Velocity feedback
• Analysis of simple speed control with speed response
• Position response
• Frequency response of the closed control loop
• Identification of motor time constants
• Identification of the velocity error constants
• Frequency and transient behaviour
• Measurement of the error deviation
• Stability considerations and the use of lead, lag & combination networks
• Tachogenerator feedback & the effects on system performance
• Acceleration feedback
• Linearisation of systems

DC Servo-Set