| 1. | Discussion on how to reduce the harmonic magnetic potential of three - phase a . c . motor
谈如何降低三相交流电机的谐波磁势 |
| 2. | Study on difficulties of direct current sensor based on magnetic potential self - balance and feedback compensation
磁势自平衡回馈补偿式直流传感器难点研究 |
| 3. | The vector relation among voltage , current and magnetic potential in phase shift regulating auto - transformer are analyzed . the parameter algebraic relation and the winding magnetic potential relation are gained
摘要分析了自耦调压移相变压器的电压、电流、磁势相量的关系，得到了各参数间的代数关系及各绕组的磁势平衡关系。 |
| 4. | Step power is the key for step magnetic potential , the pulse width modulate technology that selects the triangle wave as the carrier and ladder sine wave as the modulate wave is researched , furthermore the design of the actuator drive adopts dsp as the digital controller is introduced
步进电源是产生步进磁势的关键，文章研究了三角波为载波，阶梯正弦波为调制波的脉宽调制技术，进而介绍了采用dsp组成全数字控制器，完成步进电源触发的执行器驱动器的设计。 |
| 5. | Abstract : first , the key magnet statuses and their pertinent mmf . position of exterior rotor brushless dc motor are described in this paper . second , the air - gap magnetic field and the armature reaction of the three - phase six - step exterior rotor brushless dc motor used in electrical bicycle are analyzed by means of mmf . vector , mmf . integration and magnetic field fem respectively . some valuable conclu - sions for designing this kind of motor are obtained
文摘:给出了外转子无刷直流电动机的典型磁状态及其对应的磁势矢量位置，并用磁势矢量合成法、磁势积分法及电磁场的有限元方法对电动自行车用三相六状态外转子无刷直流电动机的气隙磁场及电枢反应进行了详尽的分析，从而得到有益于该种电机设计的结论。 |
| 6. | This paper presents the working principles of single - phase permanent - magnet stepping motor this motors main characteristics are dissymmetry rotor and a winding on permanent - magnet . the winding on permanent - magenet is used for countervailing the flux of permanent - magnet . its very important during motor working
详细介绍了一种新型单相单拍运行的永磁步进电机的运行原理，该电机主要特点为不对称转子及永磁磁极上附加一产生抵销永磁磁势的绕组，在单相单拍运行时发挥重要作用。 |
| 7. | Adopting rotor field - oriented vector control methods , through which make the stator and the rotor magnetmotive forces can be kept orthogonal all along during operation of the bldcm , combining hysteresis current modulation ' s current control advantage and space voltage vector modulation ' s torque ripple attenuation advantage , then designing a sort of bldcm hysteresis current svpwm control method
摘要研究采用转子磁场定向的矢量控制方法使无刷直流电动机定、转子磁势矢量始终保持正交，结合滞环调制电流控制和空间电压矢量调制，设计了无刷直流电动机滞环电流svpwm控制方案。 |
| 8. | The relation between the dimensions and performance studied in this paper . the orientation to obtain better performance is given . from the electromagnetic field calculation , it finds out that the flux leakage in the side surface is large . under this direction , a additional magnetic motive force is given against the flux leakage
通过对横向磁通永磁电机的电磁场分析计算,发现横向磁通永磁电机转子端面漏磁通占漏磁通比例很大,在计算结果的指导下采取了在漏磁通磁路中提供一个与漏磁磁势相反的磁势的方法来降低漏磁通取得了预期效果。 |
| 9. | Powerformer have some changes in constract with the conventional generator ， subsequently it also have some new problems in order to have an economical ， efficient ， credible development and application the structure and the philosophy of electromagnetism of powerformer will be on speaking terms changes electrical design ， magnetism design ， thermal design and structural design are have some new changes above all ， the electromagnetism parameter and the harmonic magnetomotive force of powerformer are studied in this paper first ， it mainly utilizes analytics to deduce formula of slot leakage reactance it considers three instances ， including monolayer - slot ， multilayer isometric - slot and multilayer anisometric - slot then ， the analytics and the fem are utilized to calculate slot leakage reactance of stator winding of prototype of powerformer and compare their results second ， the theory of utilitzing fem to calculate the reactance of powerformer is simply introduced ， including stable reactance ， transient and subtransient reactance specially ， the saturated influence of the stable reactance is considered then ， the results are analysed final ， it mainly introduces the influence of harmonic magnetomotive force of stator winding and analyses the harmonic magnetomotive force of stator winding then ， it mainly analyse harmonic magneto - motive force of stator winding through arranging various arrays of stator winding and observe their influence
基于上述原因，本文对powerformer的电磁参数以及定子绕组谐波磁势进行了研究。首先是用解析法推导出powerformer定子绕组槽漏抗的计算公式，考虑了单层圆形半闭口槽、多层等半径圆形半闭口槽和多层不等半径圆形半闭口槽三种情况，并对powerformer样机的定子绕组槽漏抗用解析法和有限元法进行了计算，并比较其结果；其次，简要介绍了有限元法计算powerformer电抗参数的原理，包括稳态电抗、瞬态电抗和超瞬态电抗，对稳态电抗考虑饱和影响，对结果进行分析；最后，介绍定子绕组谐波磁势对电机运行性能的影响并对定子绕组谐波磁势进行了分析。然后通过对定子绕组进行不同排列来分析定子绕组谐波磁势，看看绕组排列对谐波磁势的影响。 |
