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Calculation on Magnetic Field and Thermal Field of Permanent Magnet Motor with High Power Density

Author: RenQin
Tutor: ZouJiBin
School: Harbin Institute of Technology
Course: Motor and electrical
Keywords: Brushless DC motor High power density Loss Temperature field
CLC: TM351
Type: Master's thesis
Year: 2009
Downloads: 413
Quote: 1
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Abstract


Due to the small size of the permanent magnet brushless DC motor, light weight, environmental adaptability, high reliability, high power output and many other advantages, a wide range of applications in the field of aviation, aerospace, marine and military field as well as the high finishing. The power density of the motor and the motor size and power is closely related to the high power density is usually accompanied by a high loss of density and a high temperature rise. The temperature rise of the motor not only because it can change the performance of the motor, and may reduce the life of the motor and destroy the insulation layer, even burning motor. In order to reduce the temperature rise of the motor, the high power density brushless DC motor loss and temperature field calculation has been optimized based on the parameters of the stator slot. First, the comparative analysis of the different tooth width of the operating characteristics of the motor, the tooth width on the operating characteristics of non-linear effects, changes in various parameters of the motor stator slots calculated, based on the separation of the iron loss model the stator grooves parameters different motor The core loss in the same load, the rotor eddy current loss and copper loss, compared a loss the size of the loss distribution in a different time slot structure, were obtained the motor each loss the law changes with the stator slot parameters. Secondly, the research and analysis of the steel chassis of the motor loss calculation and analysis of the impact of the loss of the yoke high chassis, identify the yoke between the law of change and chassis loss. The magnetic permeability of the steel material cabinet, Analysis of the yoke very hour stator the degree of saturation of the yoke portion, and the copper loss and the relationship between the yoke high in the case of using the steel shell. Again, according to the basic theory of heat transfer analysis of heat conduction path of the motor within as well as to determine the various parameters of the temperature field calculation, through the establishment of the two-dimensional temperature field of the motor windings equivalent calculation model. Based on the results of the calculation of loss optimization, calculating the motor temperature rise of the stator slot parameters and comparative analysis of the different parameters of the stator slot motor temperature rise; calculated motor temperature rise in different conditions, analysis of the motor for each working temperature distribution. Calculated transient temperature rise of the motor torque changes, depending on the actual motor run state, find the temperature distribution of the motor and the motor temperature rise of the various parts of the law. Finally, two different stator parameters prototype torque changes the dynamic temperature experiment, the measured resistance method to measure the temperature of the windings of the motor when the load changes, the temperature rise of the comparative analysis of two prototypes, validation stator slot parameter optimization correctness. And experimental results and the calculated results were compared, the analysis of temperature rise causes of the deviation.

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CLC: > Industrial Technology > Electrotechnical > Motor > A special motor > Permanent magnet motor
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