A new doubly salient permanent magnet motor

In this paper, a new 8/6-pole doubly salient permanent magnet (DSPM) motor is proposed and analyzed. The key is to analytically derive the output power density of the DSPM motor in terms of the rotor-to-stator pole ratio. Hence, the analytical design, finite element analysis and computer simulation of the proposed 8/6-pole DSPM motor are presented. The results show that this DSPM motor has following major features: it can achieve higher power density than an induction motor; its power density is proportional to the ratio of rotor pole and stator pole numbers; there is a maximum speed limitation which is proportional to the voltage but inversely proportional to the phase winding turns and the rate of change of PM flux; at high speed, the distribution of phase current is asymmetric and current regulation is needed in the negative stroke. Compared with the well known 6/4-pole DSPM motor, the proposed 8/6-pole one offers higher power density, wider speed range and less phase current magnitude.published_or_final_versio

Development of doubly salient permanent magnet motor flywheelenergy storage for building integrated photovoltaic system

With ever-increasing concerns on environmental protection, the full utilization of inexhaustible solar energy is highly desirable. In this paper, a new energy storage system is proposed which consists of a building integrated photovoltaic (BIPV) array, a DC-DC converter, a doubly salient permanent magnet (DSPM) motor drive incorporated with a high-speed flywheel, and an inverter. It has the advantages that the BIPV array is practically feasible in modern cities, while the DSPM motor flywheel offers high efficiency, long cycle life and environmental friendliness.published_or_final_versio

Nonlinear magnetic circuit analysis for a novel stator-doubly-fed doubly-salient machine

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New split-winding doubly salient permanent magnet motor drive

A new split-winding doubly salient permanent magnet (DSPM) motor drive is proposed. This DSPM motor drive offers the advantages of high power density, high efficiency, and wide speed range. The corresponding operation, analysis, implementation, and experimentation are successively presented. Finally, experimental results are used to confirm that the proposed DSPM motor drive offers high efficiency over a wide output power range, exhibits good dynamic performance, and extends the constant-power operation range significantly.published_or_final_versio

Design and analysis of a novel stator-doubly-fed doubly salient motor for electric vehicles

The design of a stator-doubly-fed doubly salient (SDFDS) machine is presented. The corresponding output power equation is analytically derived. The initial calculation of motor dimensions and parameters are also discussed. Moreover, finite element analysis of this motor is carried out, in which the interaction between the field flux and armature current flux as well as the magnetic saturation are taken into account. Hence, the characteristics of the proposed motor are deduced. A 128 -pole SDFDS motor is designed and built for exemplification. Experimental results of the prototype are given to verify the theoretical analysis. © 2005 American Institute of Physics.published_or_final_versio

Static characteristics of a new doubly salient permanent magnet motor

In this paper, magnetic field analysis of a new doubly salient permanent magnet (DSPM) motor is carried out based on the finite element method (FEM). Hence, the corresponding static characteristics, including PM flux-linkage, self-inductance and mutual-inductance, are deduced (the interaction between PM field and armature field are taken into account). A method for measuring the motor inductance is newly proposed. The theoretical analysis is verified by experimental results.published_or_final_versio

A linear magnetic-geared permanent magnet machine for wave energy generation

This paper presents a new linear magnetic-geared permanent magnet (PM) machine for wave energy generation. In order to match the low speed of wave motion with the high-speed machine design, a linear PM machine is artfully integrated with a linear magnetic gear (MG). Namely, the low-speed mover of the gear is coupled to the buoy directly and reciprocates with the waves, while two sets of PMs, which function as the high-speed mover of the gear and the translator of the machine respectively, are integrated into a tubular iron core. By using the finite element method, the characteristics and performances of the proposed machine are analyzed and verified.published_or_final_versionThe 2010 International Conference on Electrical Machines and Systems (ICEMS), Incheon, Korea, 10-13 October 2010. In Proceedings of the International Conference on Electrical Machines and Systems, 2010, p. 1538-154

A new 3-phase brushless doubly-fed doubly salient machines

A new 3-phase 12/8-pole brushless doubly-fed doubly-salient (BDFDS) machine is presented in this paper. The core is to design, modeling, analyze and control the proposed BDFDS machine. The output power equation is analytically derived, and the initial calculation of machine dimensions and parameters are also discussed. By using finite element analysis, the field distributions of the BDFDS machine at different field current and load are obtained, in which the magnetic saturation and the coupling between field current flux and armature current flux are considered; furthermore, the static characteristics of the proposed machine are given. Based on the static characteristics, the system mathematical model has been established. Hence, the evaluation of system performances is conducted by computer simulations in which the simulation model combines the machine with a 3-phase half-bridge converter. A 12/8-pole BDFDS machine is designed and built for exemplification, and a drive system employing this new machine has been developed and investigated experimentally. Experimental results are also given to verify the validity of the theoretical analyses.published_or_final_versio

Torque ripple minimization of doubly salient permanent-magnet motors

Due to the nature of salient poles in both the stator and rotor, the doubly salient permanent-magnet (DSPM) motor suffers from severe torque ripples. In this paper, the torque ripple of DSPM motors is analyzed, and the torque ripple factor is newly derived. A new approach, namely the conduction angle control, is proposed to minimize the torque ripple. Moreover, the genetic algorithm is employed to optimize the corresponding control angles. Computer simulation and experimental results are given to verify the proposed approach. © 2005 IEEE.published_or_final_versio