分类： 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间： 2017-05-02
Qiao, H [Qiao, Hai][ 1 ]
Zhang, C [Zhang, Chi][ 1 ]
Liao, YY [Liao, Youyong][ 1 ]
Zhou, J [Zhou, Jie][ 1 ]
Shu, XD [Shu, Xindong][ 1 ]
摘要： As there is no round optical grating and magnetic grating with large diameter that is over 0.5m in the market, a measuring system adopting dual magnetic sensors based on FPGA is proposed in this paper to measure the position/displacement and velocity of the rotating outer-rotor motor. Through using strip-type magnetic grating to stick around the outer rotor over half circumstance, the proposed system is able to produce continuous position pulse signals by switching the signals of dual magnetic sensors. The system core chip distinguishes, subdivides and filters the signals from two sensors, judging the operational state of the sensor and generating the dual magnetic sensor switching signals. It can switches the sensor signals in real time during motor operation and measures the position/displacement and velocity of motor in a precise manner. Moreover, the position/displacement, operating time and positive/negative rotation can be displayed through man-machine interactive unit. The experimental results show that arc-second control accuracy of the outer-rotor torque motor can be achieved by using the proposed system to measure the speed and position/ displacement of the outer-rotor torque motor as the feedback signal through the motion control system of motor.
分类： 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间： 2017-05-02
Chen, JH [Chen, Jinhua][ 1 ]
Liao, YY [Liao, Youyong][ 1 ]
Zhang, C [Zhang, Chi][ 1 ]
Jiang, Z [Jiang, Zhe][ 1 ]
摘要： The free piston energy converter (FPEC) is a new type of power unit for hybrid electric vehicle. In a FPEC, an internal combustion engine driven permanent magnet linear generator (PMLG) may be utilized to produce electrical energy. This paper discusses the issues that are pertinent to the design of a linear permanent magnet generator for application in a FPEC. To achieve the required high power density and low moving mass, a tubular machine equipped with modular windings and axially magnetized is considered to be the most appropriate. Finite Element Analysis are adopted to analyse the PMLG. Magnetic field distribution, EMF, thrust force and No- load corl loss are obtained through the finite element method. An effective tool for design optimization is provided. It is shown that the machine design can be optimized with respect to three key dimensional ratios while satisfying other performance specifications.
分类： 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间： 2017-05-02
摘要： By studying the advantages and disadvantages of the conventional automatic linear door systems, it was found that flat permanent magnet linear synchronous motors (PMSLM) can satisfy high-speed long-stroke heavy-load door systems better than other techniques. In order to reach a long lifespan, the authors compared five possible topologies with flat PMLSM, and then designed a kind of magnetically suspended door system driven by a single-sided flat PMLSM and suspended by the normal force of the motor. The results demonstrate that the prototype door system satisfies the requirements.
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