Single-phase Line-start Permanent Magnet Motor Research Articles

Investigation on the performance of the single-phase LSPM motor for variable capacity type compressor

This paper investigates the performance of the line start permanent magnet (LSPM) motor which needs a high efficiency characteristic in a wide operation region. LSPM motor's performance indexes, such as efficiency, motor current, load angle and synchronous torque, have complex relationship with each other according to the main and auxiliary windings distribution, and the selection of running capacitor. The output characteristics can be defined by the winding structure which is calculated by d-q equivalent circuit and finite element method. The efficiency characteristic is verified by simulation as well as by experiment on the designed LSPM motor. From the results, we show that the redesigned model considering the winding structure and capacitor matching has a wide operating region.

Optimum Design Criteria for Maximum Torque and Efficiency of a Line-Start Permanent-Magnet Motor Using Response Surface Methodology and Finite Element Method

This paper deals with optimum design criteria for maximum torque density and efficiency of a single phase line-start permanent-magnet motor (LSPMM) using response surface methodology (RSM) and finite element method (FEM). The focus of this paper is to find a design solution through the comparison of maximum torque density and efficiency resulting from rotor shape variations. Then, a central composite design (CCD) mixed resolution is introduced, and the motor parameters meeting the required efficiency and maximum torque are determined by the characteristic map obtained by the d-q axis equivalent circuit analysis. Then the geometric shape design satisfying the motor parameters are performed. In the end, the improved LSPMM is fabricated and tested in order to measure the maximum torque and efficiency.

A Study on the Optimal Rotor Design of LSPM Considering the Starting Torque and Efficiency

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.

A study on the irreversible magnet demagnetization in single-phase line-start permanent magnet motor

The large demagnetizing currents in a single-phase line-start permanent magnet motor are generated by a starting and locked rotor condition. Thus, irreversible magnet demagnetization occurs due to the external demagnetizing field by these currents. In this paper, we present the phenomenon of the irreversible magnet demagnetization using two-dimensional finite-element method (2-D FEM). The nonlinear analysis of a permanent magnet is added to 2-D FEM to consider irreversible demagnetization. As a result, design techniques which are effective in avoiding irreversible demagnetization are proposed.

단상 유도형 동기 전동기(LSPM)의 특성해석에 관한 연구

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.

Design of Single-Phase Line-Start Permanent Magnet Motor Using Equivalent Circuit Method

In this research, the design procedure and the design method of a single-phase line-start permanent magnet motor (LSPM) are proposed. In the design procedure, the permanent magnet is designed first and the windings and capacitors are designed later. As well, the points of design of each design parameter are explained. In the design of the single-phase LSPM, the equivalent circuit method is combined with the finite element method (FEM) because it has a shorter analysis time than FEM. The 400 watts single-phase LSPM is designed and manufactured. The characteristics of the manufactured single-phase LSPM are analyzed and experimented. From the analysis result and the experiment result, it is verified that the design procedure and the design method of the single-phase LSPM is valid.

Performance of skewed single-phase line-start permanent magnet motors

In this paper, the authors investigate the modeling of single-phase line-start permanent magnet motors using finite-element (FE) analysis. It is shown that FE modeling is capable of giving very accurate predictions when compared with test results, for both skewed and unskewed motors. The skewed motor is also modeled using an analytical method. The accuracy of the FE method is contrasted with that obtained using the analytical method.