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ABSTRACT: This paper presents the control method that inverter output keeps to linear to reference voltage of Synchronous Reluctance Motor (SynRM) using DC Link voltage Synthesis. This method is reduced torque ripple considering parameters with magnetic saturation. To estimate parameters of inductances for SynRM, the proposed method uses recursive least square (RLS) estimation algorithm. The estimated inductances are used for calculating torque and DC link voltage. The Inverter output voltage cannot be displayed to linear about inverter reference voltage if Real DC Link voltage is different from DC Link voltage of PWM amplitude. Also, the over-modulation is linearity broken if reference voltage is out of range. Torque ripple generates the vibration and noise of a motor. This paper proposes the control method so that the torque ripple decreases and the linearity of inverter output keeps using the DC Link voltage Synthesis. The proposed control method is verified by computer simulation and experiment.
IEEE Transactions on Magnetics 10/2010; · 1.36 Impact Factor
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ABSTRACT: In this paper, both analytical method and numerical method are used to suggest the rotor design process of the single-phase LSPM motor. The cage-bar is designed to generate the maximum starting torque by analytical method. The torque generated from the synchronous speed is divided into reluctance torque and magnetic torque to design barriers and permanent-magnets. In this process, optimal design method and current phase angle estimation method is suggested. In final design process, tapering of the stator teeth is conducted for reducing cogging torque.
Electromagnetic Field Computation (CEFC), 2010 14th Biennial IEEE Conference on; 06/2010
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ABSTRACT: This paper presents the design process of permanent magnets to enable a wide range of constant-power operation and reduce the torque ripple by using analytical and numerical methods in PMA-SynRM. For a wide range of constant-power operation, the minimum d-axis flux-linkage of the permanent magnet is designed to be close to zero. Moreover, the unbalanced flux density in each segment is adjusted by changing the size of each permanent magnet to reduce the torque ripple. Finally, control simulations and experiments will be conducted to prove the validity of the suggested process.
IEEE Transactions on Magnetics 11/2009; · 1.36 Impact Factor
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ABSTRACT: The incomplete magnetization is a frequently occurring phenomenon during the magnetizing process of magnets in precision motors because they use ring magnets which are not segmented. Even a small variance of the incomplete magnetization can make critical changes in the characteristics of motors like cogging torque profiles and the cogging torque profiles play an important part in reducing the noise and vibration of motors. So, the modeling of the incomplete magnetization area of magnets becomes a critical point in the analysis of the precision brushless dc motors. Conventionally, the modeling method of the area is to change the magnitude of the magnetization vector according to position angles in a magnet but the authors propose a novel method for modeling the incomplete magnetization area. This method is compared with the conventional method and verified by the measured cogging torque profile.
IEEE Transactions on Magnetics 07/2009; · 1.36 Impact Factor
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ABSTRACT: This paper presents the optimal rotor design method in a single-phase line-start permanent magnet motor (LSPM) considering the starting torque and efficiency. To consider nonlinear characteristics, the design process is comprised of the FEM and analytical method. During this study, permanent-magnets and cage bars were designed using the magnetic equivalent circuit method and the barriers that control all magnetic flux were designed using the FEM, and the tradeoff of starting torque and efficiency is controlled by weight function in Taguchi method simulation. Finally, the performance of the optimal model is compared with those of conventional models.
IEEE Transactions on Magnetics 04/2009; · 1.36 Impact Factor
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ABSTRACT: This paper presents the optimal barrier design in single-phase LSPM (line-start permanent magnet motor) considering the efficiency. The line-start permanent-magnet motor is a synchronous hybrid PM/reluctance motor that is being developed for applications including compressors of air conditioner that require a high-efficiency alternative to the induction motor. To consider nonlinear characteristics, the design process is comprised of FEM and analytical method. Barriers which can control all magnetic flux are designed by using FEM. On this occasion, we perform D.O.E (design of experiments) to reduce the analysis time. Finally, the performance of optimal model is compared with those of conventional induction motor.
Electrical Machines and Systems, 2008. ICEMS 2008. International Conference on; 11/2008
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ABSTRACT: This paper presents current characteristic according to core cutting degree in rectangular core type three phase induction motors. We analyze each 10deg from one phase to next same phase using 2-D finite element analysis (FEM). According to cutting degree, flux saturation and path of flux change. Since this situation, currents are unbalance and produce harmonic components and they cause decrease of efficiency. Optimal cutting core degree selection supplies stable currents and efficiency improvement. In this paper, loss separation test was executed by IEEE Std. 112-98 Method B.
Electrical Machines and Systems, 2007. ICEMS. International Conference on; 11/2007
