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A method is introduced, which uses analytical field calculation to predict the distribution of the magnetic air-gap field of an electric machine at an early stage of design. In this paper the underlying boundary value problems are formulated and solved for a machine configuration which is held as general as possible. Focus is laid on an easy implementation and high adaptivity of presented formulae...
Toroidally wound brushless dc (BLDC) machines are compact, economical, and can operate across large air gaps. In this paper, we provide analytical design equations for a radial-flux toroidally wound BLDC machine. The validity of the design equations is checked against finite-element analyses (FEAs) and experiments. It is found that the motor constant calculated by the design equations is off only...
Due to the complexity of structure as well electromagnetic coupling, accurate calculation of self and mutual inductances of stator and rotor windings for doubly fed brushless machine (DFBM) with cage rotor is difficult which is likely to lead to inaccuracy in performance analysis. In this paper, a method of parameter calculation and performance simulation based on combined magnetic field analysis...
Having advanced in recent years, brushless doubly fed machine (BDFM) becomes a novel AC variable frequency control machine which has a broad vista of application in wind power generation system. Researchers focus on machine structure presently. Based on accurate analysis of electromagnetism relation, this paper firstly presents double-cage stator core structure in order to improve insulation of power...
In order to extend the speed operation range for the constant generating voltage or the constant motoring power of the electrical machine, a new hybrid excitation machine with isolated magnetic paths is presented in this paper. The structure of the machine is described and its operation mechanism is analyzed in details. As an example, a conceptual prototype machine integrated with a rotating-armature...
As a new type of induction machine, brushless doubly-fed machine (BDFM) has excellent speed regulation performance and can run in the condition of variable-speed-constant-frequency power generation. It has good applicable potentials on energy-saving-speed-adjusting motors and wind power generation system, but its structure and operating principle are more complex. To study the effect of different...
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