Abstract
The paper presents an unconventional approach to control the hybrid excited synchronous machine (HESM), which can be used for drives of pure electric vehicles. The hybrid excitation of the additional control coil placed on the rotor of the machine has been realized by the wireless energy transfer system connected with the rotor shaft. Experimental results of back-EMF characteristics obtained on a prototype of HESM were compared with 3-dimentional finite elements analysis (3D-FEA) predictions. This design, despite some additional complications in the power supply system of the machine, simplifies the mechanical construction and reduces the control coil’s losses compared to the construction with the coil placed on the stator.
Highlights
The air gap flux controlling in a permanent magnet machine can be realized in two ways: By the appropriate control system or by the relevant changes of the machine design
For the reason mentioned above, in this paper an unconventional approach to control the hybrid excited synchronous machine (HESM), which can be used for the drives of electric vehicles, has been proposed
These results show that fieldcontrol control range (FCR) up to 4:1 can be effectively obtained with a rpm by three operating conditions
Summary
The air gap flux controlling in a permanent magnet machine can be realized in two ways: By the appropriate control system or by the relevant changes of the machine design. A very popular method of field weakening is realized by adjusting the current in the d-axis of the machine This strategy, generates increased losses in the supply system and creates the risk of permanent magnets demagnetization, and decreases the resultant torque of the machine. The field weakening (which is obligatory) requires design of machines with lower power conversion characteristics This caused the development of hybrid excited synchronous machines [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16]. For the reason mentioned above, in this paper an unconventional approach to control the hybrid excited synchronous machine (HESM), which can be used for the drives of electric vehicles, has been proposed. This solution consists of the hybrid excitation, which is characterized by the fact that the Energies 2019, 12, 3153; doi:10.3390/en12163153 www.mdpi.com/journal/energies
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