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The Electromagnetic Field Analysis of Coaxial Type Permanent Magnet Control Device

Author: DuanXinLiang
Tutor: ZhouFeng
School: Harbin University of Science and Technology
Course: Proceedings of the
Keywords: coaxial type permanent magnet speed adjust eddy current electromagnetic field torque control
CLC: TM921.5
Type: Master's thesis
Year: 2012
Downloads: 2
Quote: 0
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Abstract


The Guideline of the Twelfth Five-Year Plan has clearly offered to develop the green economy and build a conservation-minded and environment-friendly society. Energy saving and efficiency improvement is one of the important means. For now, although the magnetic coupler which has been widely used can achieve the non-contact connection, it cannot adjust the speed according to the change of the load. Therefore, it cannot be effective for the industrial load such as the pump to achieve the effect of energy saving and efficiency improvement.The coaxial type permanent magnet coupling control device not only can achieve the flexible non-contact connection of the power equipment, but also can adjust the output torque of the device by the means such as changing the air gap size or controlling the speed. Also, the device can achieve the effect of energy saving and efficiency improvement. As a new type of non-contact flexible control devices, the magnetic coupler has a broad application prospect.Firstly, in this paper, it analyzes the present situation and the future trend of the development of the permanent magnet coupling drive technology both at home and abroad. After comparing with other types of control devices, it summarizes the advantage characteristics of the coaxial type permanent magnet coupling control device and make the structure design. At the end, it analyzes and calculates the energy saving effect of the device.Secondly, The2d electromagnetic field theory model of asynchronous permanent magnet control device has been established. It uses Ansoft finite element analysis software to do a simulation calculation on electromagnetic parameters such as magnetic field distribution and eddy current density, and obtains the distributing rules of the electromagnetic field and vortex in the idling and load conditions. It provides the theory basis for the design and structure optimization for the ventilation cooling system of the device. The imaginary displacement method is applied to calculate the torque changing from the device activating to rated load. And it was discussed that the torque characteristics is influenced by the different air gap and stressed area and the rotor losses change in the corresponding condition. This has provided the theoretical guidance for the stability and maximum efficiency optimization of the device.Results of the research show that the type of structure coaxial permanent magnet control device can transmit the torque stability, and flexibly fine-tune the rotating speed and the torque operating point by changing the air gap and stressed area. It is suitable for industrial application occasions of the fluctuation of load, and has strong engineering practical significance.

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CLC: > Industrial Technology > Electrotechnical > Electrification,electrical energy application > Electric drive ( electric drive ) > Control system
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