Yingli Luo

Influences of Rotor Bar Design on the Starting Performance of Line-Start Permanent Magnet Synchronous Motor

The dimension and material characteristic of the rotor bar can directly affect the electromagnetic parameters of line-start permanent magnet synchronous motor (LSPMSM), such as the resistance and reactance of the stator and rotor, which further affect the motors starting performance. In this paper, the electromagnetic parameters of LSPMSM with different rotor bar designs are calculated and the starting performance including the starting current and starting torque is also studied. Finally, the relationship between rotor bar parameters and motors starting parameters is presented, which provides a basis for optimizing the rotor bar of permanent magnet motors.

The influence of rotor slot wedge conductivity on transient stability of turbine generator

In this paper, we establish Field-circuit-network Coupled Time-Step Finite Element Model by the combination of magnetic field equations, electrical circuit and network equations. Based on this mode, we take a 300 MW turbine generator as an example to study the influence of rotor slot wedge material on transient stability and establish the relationship between transient stability limit and rotor slot wedge conductivity. The result shows that the transient stability limit gradually increases as the conductivity of rotor slot wedge changes from σal (conductivity of aluminum alloy) to 0.05σal.

A Design Method for Non-Skewed Small and Medium Cage Induction Motors

This paper presents a design method for non-skewed small and medium cage induction motor based on the finite element analysis, in which the approaches of asymmetrical rotor slots, closed slots, nearly slot combination and reasonable air-gap length are adopted and studied systematically. With this method, the cage induction motors with non-skewed rotor bars can be realized meanwhile, the slot harmonic, which is caused by slot opening, can be eliminated effectively and the efficiency can also be improved apparently. Finally, a design example for a 5.5 kW induction motor is also presented.

A Comparison of the Loss Characteristics in Induction Motors with the Different Core Materials

This paper intends to study the loss characteristics of the induction motors with the different core materials, in which the flux density distribution at the local core positions, including the fundamental and harmonic components, are computed and analyzed by Time-Stepping Finite Element Method (T-S FEM), then the influences of the different core materials on stator and rotor copper losses, as well as, iron losses are further studied.