• The Transactions of the Korean Institute of Electrical Engineers B
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• v.55 no.4
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• pp.189-195
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• 2006

In this paper, the inductance characteristics of interior permanent magnet synchronous motor (IPMSM) considering cross-coupling effect is analyzed. It is known that the IPMSM has it's operating point at the saturated region. So the cross-coupling effect exists, therefore cross-coupling inductance exists. With the application of Fixed Permeability Method (FPM), we can obtain more exact inductance characteristics of IPMSM. In this paper, a novel method based on the FPM is proposed, which can consider the cross-coupling effect. And the cross-coupling inductance which is the analysis result is shown. Finally, the validity of proposed method is verified by the comparison with the experimental result.

• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1213-1215
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• 2005

For synchronous motor, back-EMF and inductance have mainly effect on the characteristics of the motor. Therefore inductance and back-EMF ranges should be limited to obtain desirable characteristics, and it is possible to get design goal easily by adjusting those two parameters. In this paper EMF-Inductance Map(E-L Map) is presented in order to predict the performance of a motor in initial design. By applying the E-L map to design process of 1MW super-conducting synchronous motor it's usefulness is verified.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.52 no.6
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• pp.254-261
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• 2003

This study investigates magnetic circuit design of the Single-phase Line-start Permanent Magnet Synchronous Motor (LSPM) to develop the characteristics in steady state. In this paper, the saliency ratio, that is the ratio of q-axial inductance to d-axial inductance, and the inductance difference between q-axial inductance and d-axial inductance are increased. Design factor is selected permanent magnet position and rotor diameter. The analysis method of the synchronous motor on d-/q- axis coordinates is used for the positive component and the equivalent circuit of the induction motor is applied for the negative component analysis. Back-emf and d-q- axial inductance is analyzed by using 2 dimensional Finite Element Method (FEM). Characteristic analysis results with variation of design factor are reflected magnetic circuit design of LSPM. The characteristics of design model are compared with the characteristic of initial model.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• v.4B no.4
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• pp.211-216
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• 2004

Inductance characteristics, torque variations and ripple according to current, and position of multi-layer buried magnet synchronous machines with field-weakening operations are presented. The rotor structure optimal design of a buried magnet synchronous machine with high performance is investigated, and optimization results and comparison among design candidates are shown. For the fast and accurate search of multiple optima, the auto-tuning niching genetic algorithm is used and a final solution is selected considering various design factors.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.50 no.6
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• pp.263-272
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• 2001

The paper presents the design of a segmented type synchronous reluctance motor(SynRM) to increase its torque and power factor. The main feature of a segmented type synchronous reluctance motor is the flux barrier. Thus, the design process to find optimum value of various geometric parameters including flux barrier will be explained. Optimum value of each parameter is found where the d, q inductance difference and saliency ratio are maximized because these inductance characteristics are related to torque and power factor. Finite Element Analysis will be used to simulate motor characteristics. Analysis results of redesigned SynRM show higher saliency ratio over 10 and improved value of maximum power factor.

• Proceedings of the KIPE Conference
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• 1998.07a
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• pp.208-211
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• 1998

A phase winding of RSM is excited and measured the excited winding inductance, mutual inductance. Ld and Lq is calculated from the measurement result. Two rotors are manufactured for this paper, measured their inductance and compared the calculated equation with the conventional equation. This paper confirmed the effectiveness of the proposed method.

• Proceedings of the KIEE Conference
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• 2006.07b
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• pp.821-822
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• 2006

In the case of the interior permanent magnet synchronous motor (IPMSM), it is important to know the accurate machine parameters in the design step. In particular, d- and q- axis inductance are expected to have ripple characteristics, due to the mechanical structure and the degree of magnetic saturation. In this paper, this feature is expressed as inductance variation. Inductance variation of the IPMSM is calculated with finite element analysis, and the reason for inductance variation is identified. Finally the validity of this paper is verified by the comparison with the experimental results.

• Proceedings of the KIEE Conference
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• 2003.07b
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• pp.930-932
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• 2003

As Synchronous Reluctance Motor gives reluctance torque, An inductance is an important parameter that is proportional to torque. To achieve the high performance in sensorless control, it is necessary to consider exact inductance values because the inductance is not a constant parameter anymore. Therefore, this paper shows the inductance measurement using DC current decay test, AC standstill test, and AC standstill test considering Cross Magnetization. This inductance has also been compared with the result that is analyzed by FEM.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• v.5B no.2
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• pp.173-180
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• 2005

The construction of a Synchronous Reluctance Motor (SynRM) is simple and also highly economical because a stator from the existing AC motor can be used. Since the synchronous inductance in the Synchronous Reluctance Motor is an element that is proportional to torque, its exact value must be experimentally or analytically found for accurate control and performance development of the motor. In this paper, direct torque control (DTC) simulation is carried out to maximize the torque of the Synchronous Reluctance Motor and the fast response characteristics with the inductance value by the Finite Element Method (FEM). The response characteristics are compared through the proposed direct torque control and torque response characteristics that are based on the existing PI Control in order to confirm the fast response features. To test the performance of the direct torque controller, the torque response is analyzed with variable speed and load condition.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.52 no.2
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• pp.53-60
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• 2003

This paper deals with steady-state analysis of a single-phase line-start permanent magnet synchronous motor. In order to analyze the steady-state characteristics, the asymmetric single-phase line-start synchronous motor is converted to the symmetric two-phase synchronous motor, that is, the asymmetric magnetic field is separated from the positive and the negative symmetric components using symmetrical-component theory. The analysis method of the synchronous motor on the d-q axis coordinates is used for the positive component and the equivalent circuit of the induction motor is applied for the negative component analysis. Moreover, d-q axis inductance considering current phase angle is applied to positive component analysis for precise characteristic analysis. In order to validate the proposed analysis method, the analysis results are compared with the experimental results.