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For evaluate the thermal behavior of a permanent magnet motor under different types of losses and various loss distributions, a simplified thermal circuit is proposed. The result shows that, the model presented in the companion paper is suitable to use in machine design with certain accuracy.
The hottest spot temperature exists in the end-winding of the motor. Therefore, effectively reduce the winding temperature becomes the key of the thermal design. Direct cooling means that the coolant directly contacts with the stator and winding. It provides very efficient cooling. In this paper, a motor cooled only by water is reformed into a motor cooled by both water and oil. The experiments are...
For gaining an effective cooling performance for motor, water cooling is commonly utilized. But as the requirement for power density increasing, solely the water cooling is not sufficient. This is duo to the thermal resistance of the end winding to the water is large. To obtain lower temperature of the end winding, a new cooling method is studied. The stator and the rotor are separated by an ultrathin...
For evaluate the thermal behavior of a permanent magnet motor under different types of losses and various loss distributions, a simplified thermal circuit is proposed. This topic is split into two separated papers. The first paper focuses on the building of the model and to evaluate key parameters. The experiment to verify the accuracy of the model is presented in a separated paper. The method proposed...
Thermal behavior such as temperature rise is the most important index of an electrical machine, especially in the motor for electrical vehicle. A 7-element thermal circuit model of electrical machine has been proposed in the companion paper of this paper. Each thermal resistant in the proposed model has been derived in detail. In this paper, a prototype machine is introduced to verify the accuracy...
A Unified Field Dual Mechanical Machine is proposed in the paper, which features as spoke type PM arrangement. The presented machine has superior torque behavior compared with traditional type IPM machine. The d-axis current in the new machine has better utility, which make the presented machine a perfect match with the electric vehicle. The torque strengthen effect is analyzed with FEA, and the regular...
The hybrid excitation machine (HEM) has two kinds of excitation sources, one is the permanent magnet and the other is the field current. The mathematic model of the HEM based on DQ frame is presented in this paper. Different from the conventional Permanent Magnet Synchronous Motors (PMSM), the d-axis armature current and the dc excitation current can be both used to perform the field-weakening operation,...
In this paper the structure and operation principles of a kind of bypass hybrid excitation synchronous motor (BHESM) are presented. Based on the conventional permanent magnet machines, two field windings are added on the machinepsilas two ends. The permanent magnet (PM) provides constant flux, and the field windings produce the variable flux. The special flux excitation pattern will make BHESM a challenging...
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