Dae-Sung Jung

A Study on Improvement Magnetic Torque Characteristics of IPMSM for Direct Drive Washing Machine

This paper presents a research on magnetic torque improvement of interior permanent magnet synchronous motor (IPMSM) for a direct drive washing machine by considering various barrier shapes. For the direct drive of washing machine, the IPMSM must have high magnetic torque at low speed in the laundry mode. However, the magnetic torque of it is decreased and torque ripple is also increased at the same time, when current phase angle is increased. By using finite element analysis (FEA), several characteristics such as d-, q-axis inductance, back electromotive force (EMF), average torque, torque ripple, and cogging torque are presented. Besides, high-temperature demagnetization which can occur in manufacturing time is considered. Finally, the analysis results are compared with experimental results to verify the proposed design.

Characteristic Analysis of Permanent-Magnet-Type Stepping Motor With Claw Poles by Using 3 Dimensional Finite Element Method

This paper analyzed the characteristics of the permanent magnet (PM)-type claw pole stepping motor by using 3D finite element method (FEM). In the case of analyzing this type of motor, 3D FEM is necessary for an accurate analysis due to the magnetizing component of the z-axis direction. As a main design variable, the magnetizing pattern and PM area were selected. The variation of the detent torque and the holding depending on the shape of the pole is also shown. Finally, the results are verified as to compare with the experimental results

A study on the improvement of high power in interior permanent magnet

Recently, electric motors are required to show high efficiency/power/torque within low cost/size and noise in every application field, such as home appliance and industrial field. This paper proposed a design method that can result in motors that show low-cost and high output characteristics. An optimally designed flat type IPMSM and a V type IPMSM was design. For the design, a novel method considering d-axis armature reaction was used and a novel design equation is proposed. The validation of design method was done by comparing the manufactured motors.

Trade-off optimal design in single-phase Line-start Permanent Magnet synchronous motor

A single phase LSPM (Line-Start Permanent Magnet Motor) has been investigated to improve the efficiency. Single phase LSPM has a permanent magnet (PM) inserted rotor which generates magnet torque and reluctance torque. The torques fluctuate due to asynchronous motion during transient state. The torques act as a breaking torque which make the motor not to start. To obtain good design of single phase LSPM, there is trade off design between efficiency and starting torque which are strongly relative to the magnet volume and inserted position. This paper presents the trade off optimal design of single phase LSPM.

A Study on the Characteristics in Single-Phase Line-Start Permanent Magnet Moter

Electric motor efficient improvement from home appliance field is important to the effect reducing the energy consumption. But the electric motor design/analysis technology is still insufficient. Specially the electric motor design/analysis technology of satisfying characteristic of both the induction motor and the synchronous motor such as Line start permanent motor. Therefore the electric motor design/analysis technology is urgently demanded reliability. This paper proposes the sing1e-phase line-start permanent magnet motor to develop the motor it with be able to alternate the sing-phase induction motor it is a refrigerator compressor motor. The sing-phase induction motor is analyzed in the steady state. And we have a certification test to compare our single-phase line-start permanent magnet motor with the sing-phase induction motor. In order to improve the performance, the stator of the single-phase line-start permanent magnet motor is same as the stator of the sing-phase induction motor and changes the rotor form and has the permanent magnet. It used the Finite Element Method(FEM) which is widely used with electronic-magnetic field numerical analysis method.