E 2.1.3.2 Wydajność maszyn elektrycznych niskiego napięcia

Thanks to the lossless rotor excitation and thanks to the use of less raw materials (Al, Fe, Cu), the energy efficiency is greater than for a conventional synchronous motor. When used as a direct drive at small power outputs, an additional improvement in efficiency can be seen with respect to geared motors. Permanent magnet motors are effectively free of wear and require neither lubrication nor gears. Even as generators in small-scale power stations, high-efficiency machines achieve higher rates of efficiency than the previous solutions. In conjunction with a three-phase supply voltage, block and sinusoidal modulation modes can be investigated. How the motor functions with the rotor position sensor equipped with Hall-effect components is also covered in the experiments. By means of simple connection of windings using jumpers (bridging plugs), star and delta circuits can be converted into one another quickly and clearly. Two high-efficiency rotors are available, one with an external magnet adhered to it and one with an internal magnet inserted. To distinguish between the poles, the three magnets are colour-coded. The 10-pole stator windings are also colour-coded in order to make the arrangement of the three phases clear.

The equipment set incorporates student experiments which can be carried out in a laboratory safely using safety extra-low voltage. Experiment instructions are contained in a manual in either printed or digital form.

The target group is made up of students in general or vocational education. The experiments are designed as an introduction at a simple level of understanding.

This equipment set is a self-contained supplement for E2.1.3.1 ELM basic machines for safety extra-low voltage.

Topics

• Synchronous machines (PMSM)
• BLDC operation
• Generator operation
• Block and sinusoidal modulation
• Rotor position sensor with Hall-effect components
• Comparison between star and delta configurations
• Step operation

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