Marine wave energy is characterized by high power density and worldwide distribution thus an important renewable source energy. A high power density tubular linear switch reluctance generator (TLSRG) is presented in this paper to be used as the direct drive wave energy generator. The mover of the machine includes series of ring segments which are insulated magnetically. The topology and detailed structure of the presented machine are demonstrated. The transient FEM model with the power converter circuit for generator mode is developed and the dynamic performance of the presented TLSRG are given, validating that the presented TLSRG has been an good candidate for wave energy generator.
Many reliable energy conversion methods are constantly being sought for renewable energy applications. The permanent magnet induction generator is a new concept which uses permanent magnets to provide the flux in the machine. This will lead to an improved power factor and higher efficiency. This type of generator is a very attractive renewable solution. In this paper ,firstly,introduce the structure and principle of permanent magnet induction generator. Secondly, the dynamic starting performance of this machine is studied. Finally, finite element analysis and simulation are carried out, the results verify the performance of the machine meet the design requirements.
This paper presents a novel energy-efficient single-phase permanent magnet synchronous motor with three-phase stator windings which are connected to two external capacitors in series connection, supplied by the single-phase AC power. The positive sequence impedance and negative sequence impedance of the novel single-phase permanent magnet synchronous motor are presented based on the symmetrical component method, the condition for balanced operation is analyzed and the method for determining the requested capacitances is also obtained. The simulation model of the motor is constructed in d-q stationary reference frame. The transient performance of the proposed motor is simulated and the simulation results proved the validity of the proposed motor.
The new type single-phase induction motors with three stator windings are brought forward for there high efficiency and low cost. However, the unbalance current density in the stator windings is still a problem to the design of this type motor. This paper presents the asymmetrical stator windings and slots structure in the motor design to get the currents density balance. A magnetic field analysis of the new type tri-winding induction motor is preformed using a two-dimensional finite element method. The Maxwell stress method is used to compute the air gap torque that is required for solving the equation of motion. The perfomance of the motor with different structure stator are compared and analysised.
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