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The experiments are carried out using industrial-design machines. All the test machines possess a special base for connecting the Machine test system 0.3. The testing system can be used to record the characteristics of the machines under test. Power for the machines is supplied by special laboratory power supplies.
Objectives
- Protective measures and electrical safety
- Setting up electrical machines and putting them into operation
- Use of starting circuits
- Assessment of electrical machine characteristics
When starting up under heavy load, in the rock breaking or cement industries or in iron smelting plants, DC motors are considered essential. Their ability to cope with high peaks of torque and their linear speed response over a large range constitute their distinctive features. DC motors are also widely used in small sizes, e.g. in motor vehicles, when a purely DC supply is all that is available. LEYBOLD's range of DC motors in the 0.3 kW rating class includes series-wound, shunt-wound and compound-wound machines. The modularly designed experiments convey the fundamentals for motor and generator operation. DC generators operate on the principle of electromagnetic induction. In practice they are seldom used nowadays, but they do allow for a fundamental insight into the functioning of electrical machines and are therefore interesting from an educational point of view.
Features
- In order to protect against overheating, the stator windings of the test machines are equipped with temperature sensors
- Should overheating occur, the machine testing system automatically shuts down the machine under test, thus preventing any damage to it.
- The test machines are equipped with an educationally designed terminal board with the winding configuration printed on it.
- The ends of all the windings are connected to the terminal board and can be accessed via 4-mm safety sockets.
- Computer-supported acquisition of measurement data provides for meaningful measurement results.
The complete set is equally suitable for student experiments in laboratories with low voltage supplies (230 V AC) and for setting up on a mobile trolley for demonstration by teachers in a classroom. The procedures for the experiments are provided in a printed manual.
The target group is made up of commercial apprentices and students of electrical machine construction. The course offers experiments at an intermediate level and also allows for the necessary insight into machine behaviour for scientific interpretation at undergraduate level.
In E2.5.2 Industrial DC drives DC machines are operated using a static converter. Continuing on from the basic experiments, this course investigates the response of the machines under closed-loop current and speed control.
Topics
- Design and function of DC machines
- Armature reaction and commutation
- Series-wound machines
- Possibilities for changing speed
- Energy conversion
- Shunt-wound machines
- Operation at constant speed
- Self-excitation
- Current-voltage characteristics
- Load characteristics
- Possibilities for changing speed and adjusting for load
- Starting and braking
- Characteristics of generators
- Power performance
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