Abstract
In order to solve the problem of asymmetric bidirectional flux control capability in hybrid excitation machine, a novel structure called dual consequent hybrid excitation synchronous (DCHES) machine is presented in this paper. Generally, the analysis of back-EMF for the machine with complex electromagnetic structure such as DCHES machine should utilize 3-D finite element analysis (FEA), which will require huge resources and computing time. In order to avoid using 3-D FEA to analyze the back-EMF of complex structure, an analytical method of calculating back-EMF is presented in this paper. The electromagnetic field in 3-D space can be simplified as a 2-D field by dividing the 3-D field into several simple zones, the resultant effect equals to the summation of every single 2-D field's effect. According to electromagnetic theory, the analytical formula of back-EMF is obtained on the basis of Fourier series. The influence of main parameters on back-EMF waveform under sine and trapezoidal flux distribution is discussed respectively. The theoretical result shows that the trapezoidal air-gap flux distribution would generate a sine back-EMF. Finally, the presented analytical method is verified and evaluated with experimental results.
Highlights
The main structural parameters play an important role to the performance of electrical machines
Due to the nature of its configuration, the theory and method to analyze a dual consequent hybrid excitation synchronous (DCHES) machine is different from others
An analytical calculation method of back-EMF in a DCHES machine has been presented, and the method has been verified by finite element analysis (FEA) and measured experimentally
Summary
The main structural parameters play an important role to the performance of electrical machines. J. Wu et al.: An Analytical Method of Calculating Back-EMF in Dual Consequent Hybrid Excitation Synchronous Machine 53 and quasi-Poisonian equations to calculate the magnetic field distribution under the conditions of no-load, armature reaction, stator slotting and loading respectively, and considered two cases of radial and parallel magnetization. Similar to the 2-D analytical slotless models, there is another idea that treats the slot as an independent solution area, which was named as subdomain model[11,12] Based on this method, Zhu et al presented an accurate analytical subdomain model for computation of the open-circuit magnetic field in surface-mounted PM machines with any slot/pole combinations, including fractional slot machines, accounting for stator slotting effect[13]. A Fourier series-based analytical method is proposed to calculate the back-EMF waveform in a novel hybrid excitation machine with complex electromagnetic structure, called dual consequent hybrid excitation synchronous(DCHES) machine.
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