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Since air-gap magnetic fields of brushless doubly-fed machine (BDFM) are produced by two stator windings of different pole pairs, the spatial harmonic contents of the BDFM are higher than conventional induction machines and have a considerable effect on the machine performance. To reduce the contents of main slot harmonics, the harmonic components of airgap magnetic field for the BDFM are analyzed...
To quickly and accurately calculate steady-state performance of wound-rotor BDFM, this paper presents an electromagnetic calculation method. A 100 kW wound-rotor BDFM is used as an example to verify the quickness and accuracy of the analytical method by the comparison of the calculation data, two-dimensional (2D) FEM simulation results and experimental data.
This paper presents a design of a three-phase ac exciter for a static frequency converter (SFC). The exciter offers constant current for main machine from 0 to 1500 rpm during the starting mode. The design of the prototype machine based on the simulation of the Matlab is tested to verity if this exciting mode could meet the requirement of SFC.
Since the rotor winding (RW) of the Brushless Doubly-Fed Machine (BDFM) needs to be designed to couple the magnetomotive forces (MMFs) generated by the power winding (PW) and the control winding (CW), it is difficult to control the harmonic contents in the RW of the BDFM. Based on the principles of tooth harmonic and sinusoidal winding structure, a multi-pitch unequal-turn-coil wound rotor of the...
A brushless doubly-fed machine with tooth-harmonic wound rotor is a new type of BDFM. The machine is intended for use as a variable speed generator, or drive. Maximum torque output may be obtained by optimally dividing the overall magnetic loadings and electric loadings between the stator windings attending by reasonable rotor winding. This paper proposes an improved particle swarm optimization algorithm...
This paper presents the principle of a new rotor of Brushless Doubly-Fed Machine (BDFM) - the tooth harmonic wound rotor. The rotor could be easily coupled with both stator windings because of its high winding factor for both pole-pairs. Given the current of control winding, the harmonic analysis in space is presented. The result shows that some of the special harmonic waves, which deteriorate the...
This paper presents a new equivalent circuit for the brushless doubly-fed machine (BDFM) which is suitable for the steady state studies of the machine and the BDFM for adjustable speed drive systems. Based on the fundamental equivalent circuit for the BDFM and the chain equivalent circuit, the new equivalent circuit is developed for the investigation of the BDFM harmonic influence. Simulation results...
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