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9 条记录 (耗时 0.022 秒)

    Transverse flux electrical machine with toothed rotor
    3.
    发明授权
    Transverse flux electrical machine with toothed rotor 失效
    带齿形转子的横向磁通电机

    公开(公告)号：US06949855B2

    公开(公告)日：2005-09-27

    申请号：US10961089

    申请日：2004-10-12

    申请人： Maxime Dubois ,  Henk Polinder ,  Jan Abraham Ferreira

    发明人： Maxime Dubois ,  Henk Polinder ,  Jan Abraham Ferreira

    IPC分类号： H02K1/27 ,  H02K21/12 ,  H02K1/06 ,  H02K21/00 ,  H02K41/02

    CPC分类号： H02K1/278 ,  H02K21/12 ,  H02K21/125 ,  H02K2201/12

    摘要： The invention concerns a transverse flux electrical machine operating with alternating current, having a first element having an alternate arrangement of excitation cores and of flux return cores and a winding of electrical conductors, the winding of electrical conductors being wound as a toroid, inside all said excitation cores; a second element having an exciter section comprising two toothed magnetic structures, each toothed magnetic structure comprising a number of slots equal in number to the total number of excitation cores and of flux return cores, the corresponding slots of each magnetic structure being toothed by being aligned; a magnetized sub-assembly is inserted inside each indentation so that an alternating arrangement of magnetic north poles and south poles is produced in each of these magnetic toothed structures of said exciter section; an air gap between the first element and the second element; at least one of the first element and of the second element being capable of rotating around a rotation axis that is common to the first element and to the second element.

    摘要翻译： 本发明涉及一种用交流电工作的横向磁通电机，其具有第一元件，该第一元件具有激励芯和磁通返回磁心的交替布置，以及电导体的绕组，电导体绕组作为环形线缠绕， 励磁芯; 具有包括两个齿形磁性结构的激励器部分的第二元件，每个齿形磁性结构包括数量等于激励磁芯和磁通返回磁芯的总数的多个狭槽，每个磁性结构的对应槽通过对齐而齿形 ; 磁化子组件插入每个压痕内，使得在所述激励器部分的这些磁齿结构中的每一个中产生磁性北极和南极的交替排列; 第一元件和第二元件之间的气隙; 第一元件和第二元件中的至少一个能够围绕第一元件和第二元件共有的旋转轴线旋转。

    Power converter
    5.
    发明授权
    Power converter 失效
    电源转换器

    公开(公告)号：US5712771A

    公开(公告)日：1998-01-27

    申请号：US339003

    申请日：1994-11-14

    申请人： Johan Christiaan Fitter ,  Jan Abraham Ferreira ,  Philippus Coenraad Theron

    发明人： Johan Christiaan Fitter ,  Jan Abraham Ferreira ,  Philippus Coenraad Theron

    IPC分类号： B23K9/10 ,  H02M3/337 ,  H02M3/335

    CPC分类号： H02M3/3376 ,  B23K9/1056 ,  Y02B70/1433

    摘要： A power convertor has a partial series resonant convertor circuit for supplying power at a substantially constant level to a load of variable impedance, and a control circuit for controlling the operation of the convertor circuit. The control circuit includes sensing lines for sensing a variation in load impedance below a threshold value, and regulating means responsive to the sensing lines for reducing the power supplied to the load by lowering an input control signed to a voltage-controlled oscillator. The control circuit is arranged to operate the convertor circuit in a first normal load mode in which the impedance of the load is above the threshold value and a second reduced load mode in which the impedance of the load is below the threshold value so as to limit a rise in current through the load. The invention extends to a method of controlling a power convertor.

    摘要翻译： 功率转换器具有用于向可变阻抗的负载提供基本上恒定电平的功率的部分串联谐振转换器电路和用于控制转换器电路的操作的控制电路。 控制电路包括用于感测低于阈值的负载阻抗变化的感测线路，以及响应于感测线路的调节装置，通过降低被分配到压控振荡器的输入控制来减小提供给负载的功率。 控制电路被布置成在负载的阻抗高于阈值的第一正常负载模式和负载的阻抗低于阈值的第二减小负载模式下操作转换器电路，从而限制 电流通过负载上升。 本发明延伸到控制功率转换器的方法。

    Resonant power converter for energizing a coil
    8.
    发明授权
    Resonant power converter for energizing a coil 失效
    谐振功率转换器，为线圈通电

    公开(公告)号：US6028760A

    公开(公告)日：2000-02-22

    申请号：US965837

    申请日：1997-11-07

    申请人： Jan Abraham Ferreira

    发明人： Jan Abraham Ferreira

    IPC分类号： G01R20060101 ,  G01V20060101 ,  G01V3/165 ,  H01H20060101 ,  H02M20060101 ,  H02M7/53846 ,  H02M7/5387 ,  H03K20060101 ,  H01H47/36

    CPC分类号： G01V3/165 ,  H02M7/53871 ,  Y02B70/1441

    摘要： A pulse generator is provided for energizing a coil with period bipolar current pulses for the purposes of airborne prospecting. The pulses have a generally square waveform, and the pulse generator includes a resonant DC to AC converter circuit including a DC input and an output coupled to the coil. A control circuit is provided for controlling the switching of the converter, and a resonant capacitor is connected in parallel across the DC input. A decoupling diode is provide for decoupling the resonant capacitor from the DC input when the voltage across the resonant capacitor exceeds that of the DC input. The converter includes first and second resonant charging sub-circuits, first and second resonant discharging sub-circuits, first and second freewheeling sub-circuits and first and second exponential charging sub-circuits. The control circuit is arranged to control the amplitude and frequency content of the square waveform by switching the convertor circuit to operate between the above sub-circuit types in at least one controlled switching cycle during unipolar current pulse intervals. The circuit further includes a clamping circuit arranged to supply a substantially constant DC voltage to the coil which is higher than that of the DC input.

    摘要翻译： 提供脉冲发生器用于为具有周期性双极电流脉冲的线圈供电，以进行机载探测。 脉冲具有大致正方形的波形，并且脉冲发生器包括包括DC输入和耦合到线圈的输出的谐振DC至AC转换器电路。 提供控制电路用于控制转换器的开关，并且谐振电容器并联连接在DC输入端。 当谐振电容两端的电压超过直流输入的电压时，去耦二极管用于将谐振电容器与直流输入端分离。 转换器包括第一和第二谐振充电子电路，第一和第二谐振放电子电路，第一和第二续流子电路以及第一和第二指数充电子电路。 控制电路被布置为通过在单极电流脉冲间隔期间在至少一个受控切换周期中切换转换器电路以在上述子电路类型之间操作来控制方波的幅度和频率含量。 该电路还包括钳位电路，该钳位电路被布置成向线圈提供基本上恒定的直流电压，该直流电压高于直流输入的直流电压。

    Method and apparatus for controlling arcing in a DC arc furnace
    9.
    发明授权
    Method and apparatus for controlling arcing in a DC arc furnace 失效
    用于控制直流电弧炉中电弧的方法和装置

    公开(公告)号：US06192065B1

    公开(公告)日：2001-02-20

    申请号：US09428919

    申请日：1999-10-28

    申请人： Jan Abraham Ferreira ,  Anthony Wayne Wewege

    发明人： Jan Abraham Ferreira ,  Anthony Wayne Wewege

    IPC分类号： H05B7144

    CPC分类号： H05B7/00

    摘要： In the operation of a dc arc furnace components of the furnace are monitored to detect unwanted arcs. A first low impedance path is continuously established between the components. When an arc is detected a second conductive path of a predetermined impedance is established between the components, in parallel to the first low impedance path, to extinguish the arc. After the arc has been extinguished the second path is open circuited to restore the furnace to normal operation.

    摘要翻译： 在直流电弧炉的操作中，监测炉子的部件以检测不需要的电弧。 在组件之间连续建立第一个低阻抗路径。 当检测到电弧时，在与第一低阻抗路径平行的部件之间建立预定阻抗的第二导电路径以熄灭电弧。 电弧熄灭后，第二路径开路，将炉恢复正常运行。