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This paper presents design and analysis of low‐speed, high‐torque permanent magnet motors. The motor has 16‐pole, 18‐coil construction, and a unique winding arrangement to produce high torque. The simplified torque analysis is proposed considering the line of magnetic induction distribution in the motor. The validity of the proposed analysis has been proved by both linear and nonlinear FEM analyses. The 500‐Nm, 200‐rpm test motor has been designed and constructed and the motor shows the expected characteristics. © 2000 Scripta Technica, Electr Eng Jpn, 132(3): 48–56, 2000 相似文献
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This paper presents an optimum design approach for low‐speed, high‐torque permanent magnet motors. The approach is divided into two steps: the first consists of the rough estimation of torque by linear analysis, and the second the optimization of the motor configuration by nonlinear FEM analysis. Under restricted dimensional specifications and electrical requirements, a 16‐pole, 18‐coil permanent magnet motor with a rating of 600 Nm and 300 rpm was designed and constructed. © 2001 Scripta Technica, Electr Eng Jpn, 135(4): 52–63, 2001 相似文献
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为实现碳氢化合物发电机的小型化,提高微机电系统的集成性和发电效能,设计了一种微球轴承支撑的电磁微型涡轮发电机系统,由一种具有高磁通密度的厚磁性元件的硅微涡轮转子和一种具有最佳磁通连接和低压线圈电阻的薄铜片线圈组成.充分利用微球轴承的稳定性和简单性,实现了利用气流推动转子转动输出电能的集成度高和简单操作目的.对系统设计方... 相似文献
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KENJI HIRAMOTO HIDEO NAKAI YUKO KANO EIJI YAMADA RYOJI MIZUTANI 《Electrical Engineering in Japan》2017,198(2):81-88
This paper presents a new type of magnet‐free motor that has concentrated stator windings and rotor coils with a pair of diodes. The most important feature of this motor is that currents in the rotor coils can be generated by utilizing the changes in the spatial second harmonic of the magnetic fields due to the concentrated stator windings, which normally increase motor losses. A prototype of the motor was designed and fabricated, and its basic performance was evaluated. First, using simplified analytic models, we explain the mechanism of inducing currents in the rotor coils by the changes in the spatial second harmonic of the magnetic fields. Second, we compare the torque performance of the proposed motor and that of other types of motors including a magnet motor through finite‐element analyses. The analyzed data show that the proposed motor can possess greater torque/volume ratio than that of the other motors. Finally, using the measured data, we validate the mechanism of inducing currents in the rotor coils, and examine the torque and power characteristics of the motor. 相似文献
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Mikihiko Endo Tomonori Koyama Yousuke Takahashi Katsuyuki Kaiho Satoru Yanabu 《Electrical Engineering in Japan》2010,173(4):20-27
Using a high‐temperature superconductor, we constructed and tested a model Superconducting Fault Current Limiter (SFCL). The SFCL that we proposed has a vacuum interrupter with electromagnetic repulsion mechanism. We set out to construct a high‐voltage‐class SFCL. We produced an electromagnetic repulsion switch equipped with a 24‐kV vacuum interrupter (VI). However, the opening speed becomes slower, because the larger vacuum interrupter needs a heavier‐weight contact. For this reason, the current which flows in a superconductor may not be interruptible within a half cycle of current. In order to solve this problem, it is necessary to change the design of the coil connected in parallel and to strengthen the electromagnetic repulsion force at the time of opening the vacuum interrupter. Thus, the design of the coil was changed, and in order to examine whether the problem is solvable, a current limiting test was conducted. We carried out a current limiting test using second‐generation (2G) HTS wire. The element used in this experiment has a stainless steel stabilizer on both sides of the wire. In the experiment we succeeded in interrupting the current of a superconductor within a half cycle. © 2010 Wiley Periodicals, Inc. Electr Eng Jpn, 173(4): 20–27, 2010; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.21039 相似文献
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This paper provides an experiment‐based discussion on a modular multilevel cascade converter based on triple‐star bridge cells (MMCC‐TSBC) for a low‐speed high‐torque motor drive. The TSBC is a direct ac‐to‐ac power converter capable of achieving bidirectional power flow as well as drawing and feeding three‐phase sinusoidal input (supply‐side) and output (motor‐side) currents with any power factor at both sides. This paper discusses active dc‐capacitor‐voltage control applied to the low‐speed, high‐torque motor drive. A specially designed downscaled system combining a 320‐V, 38‐Hz, 6‐pole, 15‐kW induction motor with a 400‐V, 15‐kW TSBC is constructed and tested to confirm the validity of the motor drive. Experimental waveforms obtained from the downscaled system confirm stable operation with the rated load torque across a range from a standstill to the rated speed, including satisfactory start‐up performance. 相似文献
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Tomonori Koyama Katsuyuki Kaiho Iwao Yamaguchi Satoru Yanabu 《Electrical Engineering in Japan》2011,175(3):12-19
Using a high‐temperature superconductor, we constructed and tested a model superconducting fault current limiter (SFCL). The superconductor and a vacuum interrupter serving as the commutation switch were connected in parallel using a bypass coil. When the fault current flows in this equipment, the superconductor is quenched and the current is then transferred to the parallel coil due to the voltage drop in the superconductor. This large current in the parallel coil actuates the magnetic repulsion mechanism of the vacuum interrupter and the current in the superconductor is interrupted. Using this equipment, the current flow time in the superconductor can easily be minimized. On the other hand, the fault current is also easily limited by the large reactance of the parallel coil. This system has many advantages. Thus, we introduced an electromagnetic repulsion switch. High‐speed reclosing after interrupting the fault current in the electrical power system is essential. Thus, the SFCL should recover to the superconducting state before high‐speed reclosing. But the superconductor generates heat at the time of quenching, and it takes time to recover to the superconducting state. Therefore, the recovery time is an issue. In this paper, we study the superconductor recovery time. We also propose an electromagnetic repulsion switch with a reclosing system. © 2011 Wiley Periodicals, Inc. Electr Eng Jpn, 175(3): 12–19, 2011; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.21072 相似文献
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针对瞬变电磁法激励线圈参数开展研究,根据磁感应强度矢量叠加原理,设计几种结构简单具有聚焦特性的激励线圈结构,通过比较聚焦效果、互感大小及制做难度等综合考虑择优选出(矩形面阵列),通过响应面法对具有磁聚焦特性的线圈进行参数优化,然后利用电磁仿真软件进行模拟仿真,与传统单线圈进行对比,该激励线圈使磁场的主要能量聚焦在半径小于0.3m,且该目标区域内磁感应强度增强了33%,为下一步实际应用奠定基础,改变矩形阵列的重合面积实现不同埋深的磁聚焦,良好的聚焦效果提高瞬变电磁法的局部缺陷检出率,实现并行和重叠埋地金属管道剩余壁厚的精确检测。 相似文献
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In this paper, a new hybrid‐excited motor is proposed. Its unique feature is that it has no field exciting coil, despite being a type of bypass yoke core (BYC) hybrid‐excited synchronous motor. Based on finite element analysis (FEA), the following facts are clarified. Since the stator coil magnetomotive force (MMF) and claw poles rotate at the same speed and in the same direction, they are motionless relative to each other. Since the claw poles are located at one of its ends near the BYC surface with a gap, it receives immovable magnetization by the stator coil MMF through the BYC; then the claw poles can supply a magnetic field flux via the BYC. This flux via the BYC increases the total torque, because its torque is added the two other torque components: the permanent magnet torque and claw poles reluctance torque. In addition, the magnetic polarity and the amount of the flux of the claw poles can be varied by controlling the armature current phase angle. 相似文献
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片状无轴承磁电机的研究 总被引:4,自引:1,他引:4
研究了一种新型的片状无轴承永磁电机的工作原理和结构设计,只须控制转子的两个径向自由度,就能够实现磁悬浮并驱动电机旋转;当电机极对数33时,径向磁悬浮力与电机转矩互不耦合,可以独立设计磁悬浮轴承与电机的控制系统;提出了新的、工艺性好的绕线方法,只需在单个磁极上绕线,不需要跨磁极绕线;研制了电气控制系统,包括双向电流型开关功率放大器、PID控制器等;设计、制造了内转子式的片状无轴承永磁电机样机;试验研究表明,研究的片状无轴承永磁电机成功地实现了磁悬浮,最高转速达到了3300 r/min,转子振幅<20 mm。 相似文献
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同步感应线圈发射器是一类利用电磁能推进电枢的发射器。普通三级线圈发射器在加速电枢过程中形成的推力不够平滑稳定,且随着速度与推力的增大,驱动线圈易于损坏。文章提出了一种两段三级组合式同步感应线圈发射器设计方案,进而采用有限元仿真软件进行了场路耦合计算,对普通三级线圈同步感应发射器和新设计的发射器的电枢所受电磁力、电枢速度变化等特性的波形进行了比较。结果表明,两段三级组合式同步感应线圈发射器对电枢能产生更大的推力,且推力和加速度变化特性的波形更为平滑稳定;而且其两段三级组合式设计,能够分散线圈的径向受力,从而使驱动线圈不易损坏。物理试验结果验证了仿真计算结果的可信性。 相似文献
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This paper proposes a new torque‐sensorless torque control method for permanent‐magnet synchronous motors (PMSMs). The proposed method can almost perfectly compensate the sixth harmonic torque ripple that is caused by nonsinusoidal distributions of the back electromagnetic force and the rotor magnetic flux of PMSMs. The torque control system is, in principle, constructed on the basis of vector control, but has two new, dedicated speed‐varying devices: a harmonic torque observer and a current controller. The speed‐varying harmonic torque observer can estimate the harmonic component over a wide range of speeds, even when the generated torque is constant, and produce a suitable compensation signal. The speed‐varying current controller shows stable control performance over a wide range of speeds; it can fully track the compensated current command containing the DC and sixth harmonic components. The effectiveness of the proposed method is examined and verified through extensive numerical experiments. 相似文献
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感应线圈型发射器中每级驱动线圈都会对电枢产生脉冲形式的电磁推力,导致电枢在发射过程中加速力波动较大。过大的加速力峰值以及加速力波动都可能对载荷造成不利影响甚至损坏其内部携带的敏感电子器件,因而限制了感应线圈型发射器在实际工程应用中的价值。针对上述问题,提出一种多电容分时触发的新型驱动电路,并通过分析电容值和电枢触发位置变化对发射器发射效率的影响,说明了该电路的可行性。设计三种模式的驱动电路进行对比,研究结果表明:相比于其他电路触发模式,提出的分时触发模式在初始储能相同和电枢出口速度近似的情况下,电磁加速力峰值降低了2.04 kN,加速力波动降低了2.36 kN。因此,采用分时触发电容的驱动外电路,可以有效降低电枢的加速力峰值和加速力波动,并为携带敏感载荷的感应线圈型发射器的设计提供了参考价值。 相似文献
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《Industry Applications, IEEE Transactions on》2008,44(6):1659-1665