Universal motor AC, 0.3

Universal motors are particularly popular in the hand tool sector. Their versatile capabilities make them reliable and competent work partners in the workshop. Typical features that make them so attractive include their compact design, high torque at variable speeds and simple control. Universal motors are equipped with combined direct and alternating current technology. This enables them to deliver power where high starting torques or high speeds are required.

Learning objectives

• Protective measures and electrical safety
• Setting up electrical machines and putting them into operation
• Use of starting circuits
• Assessment of electrical machine characteristics

Universal motors are a kind of commutator machine for both DC and AC operation. This is achieved by additional lamination of the iron in the stator. Universal motors can also be called single-phase series-wound motors. They are in widespread use, for example, in household appliances and machine tools.

Highlight

• In order to protect against overheating, the stator windings of the test machines are equipped with temperature detectors.
• In case of overheating, the machine testing system switches off the load of the test machine, thus a preserved air cooling. This prevents damage to the testing machines.
• 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 led out at the terminal board at safety sockets (4 mm).
• Computer-supported acquisition of measurement data provides for meaningful measurement results.
• The arrangement of the 4 mm safety sockets corresponds to the standards for industrial machines.

Measuring and media system

Machine Test CASSY

The Machine Test CASSY 0.3 can be quickly operated in all functions directly via the display, the rotary knob and the buttons on the device. All settings and measurement results can be saved on the device and quickly called up again later or simply downloaded.

In addition, the Machine Test CASSY 0.3 system can be fully controlled in real time via the RJ45 Ethernet, W-LAN and USB-C interfaces.

These interfaces can be used by the following software:

• CASSY Lab 2 for drive and energy technology,
• MATLAB® and LabVIEW,
• Lab Docs Editor Advanced.

The following integrated servers are available in the Machine Test CASSY 0.3 for the local media connection of at least four end devices simultaneously.

Further information can be found in the product documentation 7731901 Machine Test CASSY 0.3.

Target group

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. The media connection makes the experiments suitable for demonstration in the classroom or a lecture hall.

The following equipment includes a related experiment with DC machines:

• E2.2.2.2 Universal motor DC 0.3.
• E2.2.3.2 Capacitor motor, 0.3