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This paper investigates the thermal performance of a three-phase 10kW flux-switching permanent magnet (FSPM) machine used as an integrated starter generator (ISG) for hybrid electric vehicles, where the temperature rise experiments are conducted under different operating conditions. Also, the thermal analysis of the FSPM machine is simplified into one-dimensional steady heat conduction with two heat...
The evaporative cooling system for wind power generator inclines at an angle of 3∼5 degrees. Due to the special structure, it forms a liquid-gas two-phase self-circulation. Two-phase flow self-circulating system is a typical nonlinear dynamic system. So it is important to study the nonlinear characteristics. In this paper, the nonlinear characteristics were studied through theoretical analysis and...
Cable conductor temperature is the key condition to determine whether current in operation reaches to cable's ampacity. In order to optimize cable operation, it is important to calculate cable conductor temperature with high accuracy. A simple and quick method of calculating temperature field for double-circuit underground cables is introduced in this paper. The superpose principle is applied to establish...
A three-dimensional finite element model of miniature circuit breaker is established. The steady state temperature field is obtained by the method of electrothermal coupling, and the mechanism of overload protection is analyzed. The influence of wire size on the temperature of bimetal is studied. A simple and effective method to reduce the influence of external wire size is presented. The influence...
This paper presents thermal analysis of a water-cooled dual-stator axial-flux permanent magnet (AFPM) machine with focus on the sandwiched rotor. The rotor of the machine is featured by combined rectangle-shaped magnets. Firstly, the eddy current losses in the PM are calculated and analyzed. Secondly, lumped-parameter and FE thermal models are established to calculate the temperature distribution...
The influence of different fault modes (open-circuit fault and short-circuit fault) on the post-fault performance of six-phase fault tolerant permanent magnet synchronous motor (FTPMSM) is investigated in this paper. The copper loss of the FTPMSM under different fault modes is calculated in analytical form based on the heat equivalence principle due to the non-sinusoidal waveform of non-fault phase...
The Power density of ECRIS magnet coil is larger than 3000kW/m3, and evaporative cooling technology is an ideal method to achieve the cooling requirement. The two phase flow of evaporative cooling system affects the cooling efficiency of coil. This paper introduces the self-driven evaporative cooling system of magnet, and analyses the pie structure of magnet coil and two phase flow channel in the...
The core temperature of power cables is a key supervising factor which concerns the operation safety of transmission line. However, direct measurement influences insulation performance due to embedding instruments into the cable. In this paper a measurement method using temperature retrieval is proposed. The finite element models of the cable are established for excavating the implicit relationships...
This paper proposes the study of the thermal management system of an energy storage system centered on lithium-ion capacitor (LiC). The investigated system is a LiC module made of 12 cells. A proposed passive thermal strategy has been designed in a 3D model using COMSOL Multiphysics. The strategy consists of integrating different cooling strategies, i.e phase-change materials (PCMs) and liquid-cooling...
The stability of magnetic bearings will seriously affect the overall operation of the motor. Magnetic bearing temperature is closely related to the performance of magnetic bearing (MB) system. Therefore, loss calculation and thermal estimation are very important in the design of MB system. A MB system including a pure radial magnetic bearing (RMB) and a combined radial and axial magnetic bearing (CRAMB)...
The high-speed rotor supported by active magnetic bearings (AMBs) has been applied to air blower and gas compressor progressively for their advantages of high power density, low loss and small volume. In order to improve the modal of the multi-ring configuration rotor, the temperature gradient method was proposed. This method can reduce the axial gap width to increase the rotor stiffness and to further...
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