Method for controlling a permanent magnet motor
    3.
    发明授权
    Method for controlling a permanent magnet motor 失效
    永磁电机控制方法

    公开(公告)号:US06605912B1

    公开(公告)日:2003-08-12

    申请号:US09104488

    申请日:1998-06-25

    IPC分类号: H02P750

    摘要: A three region control strategy for a permanent magnet motor is presented. In a first control region, the permanent magnet motor is operated at, a 120° conduction square wave mode at reduced phase current, and below a no-load speed. The motor phase current commutation causes eddy current losses in the rotor magnets and core which are insignificant due to the low phase currents and relatively low rotor speed. Meanwhile, the inverter switching losses are kept low as two switches are in use (on/off) for each current commutation during the 120° conduction mode. In a second control region, the permanent magnet motor is operated at a 180° conduction sinusoidal wave mode with high phase currents. The 180° conduction sinusoidal wave mode minimizes the commutation loss. In a third control region, the permanent magnet motor is operated above its no-load speed or in a field weakening mode. At these higher speeds the slot ripple and commutation losses on the rotor increase, and the demagnetizing component of the armature reaction increases due to field weakening. Commutation losses are minimized through sinusoidal current operation. In the field weakening mode, the phase current conduction angle is set to 180° and the phase currents become sinusoidal.

    摘要翻译: 介绍了永磁电动机的三区控制策略。 在第一控制区域中,永磁电动机以相对于减小的相电流在120°导通方波模式下工作,并且低于空载速度。 电动机相电流换向导致转子磁体和磁芯中的涡流损耗由于低相电流和相对较低的转子转速而不显着。 同时,在120°导通模式期间,对于每个电流换向,两个开关正在使用(开/关),逆变器开关损耗保持较低。 在第二控制区域中,永磁电动机在具有高相电流的180°导通正弦波模式下操作。 180°导通正弦波模式使换向损耗最小化。 在第三控制区域中,永磁电动机在空载速度或弱磁模式下运转。 在这些更高的速度下,转子上的槽波动和换向损耗增加,并且由于磁场弱化,电枢反应的退磁分量增加。 通过正弦电流操作使换向损耗最小化。 在弱磁模式中,相电流导通角设定为180°,相电流变为正弦。

    High-performance piston core for a magnetorheological damper
    4.
    发明授权
    High-performance piston core for a magnetorheological damper 有权
    用于磁流变阻尼器的高性能活塞芯

    公开(公告)号:US06948312B1

    公开(公告)日:2005-09-27

    申请号:US10811516

    申请日:2004-03-29

    IPC分类号: F16D37/02 F16F9/32 F16F9/53

    CPC分类号: F16F9/3214 F16F9/535

    摘要: A high-performance piston core including a first piston cylinder and a second piston cylinder, with a piston center longitudinally disposed between and magnetically coupling the first piston cylinder and the second piston cylinder. The piston center is made of high-performance magnetic material, such as Cobalt steel (CoFe), Silicon steel (SiFe), Vanadium/Cobalt steel (Permendur), alloys thereof, or the like. The high-performance magnetic materials exhibit high magnetic permeability and reduce the magnetic reluctance of flux bottlenecks. In addition, high-performance magnetic materials typically saturate at a higher flux density than the conventional magnetic materials. The first piston cylinder and the second piston cylinder can be made of conventional magnetic material, such as low-carbon steel. The first piston cylinder can include a ring disposed about an end, where the end is longitudinally attached and magnetically coupled to the piston center.

    摘要翻译: 一种高性能活塞芯,包括第一活塞气缸和第二活塞气缸,活塞中心纵向设置在第一活塞气缸和第二活塞气缸之间,并且磁性联接。 活塞中心由钴(CoFe),硅钢(SiFe),钒/钴钢(Permendur),合金等高性能磁性材料制成。 高性能磁性材料具有高磁导率,降低了磁通量瓶颈的磁阻。 此外,高性能磁性材料通常以比常规磁性材料更高的磁通密度饱和。 第一活塞缸和第二活塞缸可由常规的磁性材料制成,例如低碳钢。 第一活塞气缸可以包括围绕端部设置的环,其中端部纵向附接并且磁耦合到活塞中心。

    Aviation fuel cold flow additives and compositions
    5.
    发明申请
    Aviation fuel cold flow additives and compositions 审中-公开
    航空燃料冷流添加剂和组成

    公开(公告)号:US20070044375A1

    公开(公告)日:2007-03-01

    申请号:US11447360

    申请日:2006-06-06

    IPC分类号: C10L1/18 C10L1/22

    摘要: Aviation fuel, such as jet fuel, blends and methods for improving cold flow properties of such fuels at extremely low temperatures are disclosed. Cold flow properties of, for example, JP-8+100 jet fuel, are improved by addition to the fuel of a polymer formed from polymerization of an α-olefin monomer or monomers. Demonstratable cold flow improvement of such fuels at temperatures of about −53° C. and lower is shown.

    摘要翻译: 公开了诸如喷气燃料的航空燃料,用于在极低温度下改善这种燃料的冷流特性的共混物和方法。 通过加入由α-烯烃单体或单体的聚合形成的聚合物的燃料,可以改善例如JP-8 + 100喷气燃料的冷流动特性。 示出了在约-53℃和更低的温度下这种燃料的可证实的冷流改进。

    Aviation fuel cold flow additives and compositions
    6.
    发明申请
    Aviation fuel cold flow additives and compositions 审中-公开
    航空燃料冷流添加剂和组成

    公开(公告)号:US20070044374A1

    公开(公告)日:2007-03-01

    申请号:US11438816

    申请日:2006-05-23

    IPC分类号: C10L1/18 C10L1/22

    CPC分类号: C10L1/224 C10L1/22 C10L1/221

    摘要: Aviation fuel, such as jet fuel, blends and methods for improving cold flow properties of such fuels at extremely low temperatures are disclosed. Cold flow properties of, for example, JP-8 jet fuel are improved by addition to the fuel of an oil-soluble, polar nitrogen-containing compound. Demonstratable cold flow improvement of such fuels at temperatures of about −53° C. and lower is shown.

    摘要翻译: 公开了诸如喷气燃料的航空燃料,用于在极低温度下改善这种燃料的冷流特性的共混物和方法。 通过加入油溶性极性含氮化合物的燃料来改善例如JP-8喷气燃料的冷流动性能。 示出了在约-53℃和更低的温度下这种燃料的可证实的冷流改进。

    Permanent Magnet Rotor With Intrusion
    7.
    发明申请
    Permanent Magnet Rotor With Intrusion 审中-公开
    永磁转子与入侵

    公开(公告)号:US20130169101A1

    公开(公告)日:2013-07-04

    申请号:US13559323

    申请日:2012-07-26

    IPC分类号: H02K1/17

    摘要: A rotor for an electric machine is provided that includes a magnet and a non-magnetic region located adjacent the magnet. The non-magnetic region has an intrusion extending into the non-magnetic region.

    摘要翻译: 提供一种用于电机的转子,其包括磁体和位于磁体附近的非磁性区域。 非磁性区域具有延伸到非磁性区域的侵入。

    LOW AXIAL FORCE PERMANENT MAGNET MACHINE
    8.
    发明申请
    LOW AXIAL FORCE PERMANENT MAGNET MACHINE 审中-公开
    低轴永磁电机

    公开(公告)号:US20130169097A1

    公开(公告)日:2013-07-04

    申请号:US13555943

    申请日:2012-07-23

    摘要: An electric machine includes a plurality of teeth separated by a plurality of slots positioned on an armature of the electric machine. Each of the teeth may include at least one bifurcation. A plurality of magnets may be arranged on a main field of the electric machine to form an axial array group. The magnets in the axial array group may be arranged in the main field with respect to each other to create a multi-stepped arrangement having a predetermined step angle. The step angle is determined based on the positioning of the bifurcations and the slots.

    摘要翻译: 电机包括由定位在电机的电枢上的多个槽分开的多个齿。 每个齿可以包括至少一个分叉。 多个磁体可以布置在电机的主场上以形成轴向阵列组。 轴向阵列组中的磁体可以相对于彼此布置在主场中,以产生具有预定阶梯角的多级布置。 基于分叉和槽的位置确定步距角。

    HIGH-PERFORMANCE PISTON CORE FOR A MAGNETORHEOLOGICAL DAMPER
    10.
    发明申请
    HIGH-PERFORMANCE PISTON CORE FOR A MAGNETORHEOLOGICAL DAMPER 有权
    用于磁流变阻尼器的高性能活塞芯

    公开(公告)号:US20050210870A1

    公开(公告)日:2005-09-29

    申请号:US10811516

    申请日:2004-03-29

    IPC分类号: F16D37/02 F16F9/32 F16F9/53

    CPC分类号: F16F9/3214 F16F9/535

    摘要: A high-performance piston core including a first piston cylinder and a second piston cylinder, with a piston center longitudinally disposed between and magnetically coupling the first piston cylinder and the second piston cylinder. The piston center is made of high-performance magnetic material, such as Cobalt steel (CoFe), Silicon steel (SiFe), Vanadium/Cobalt steel (Permendur), alloys thereof, or the like. The high-performance magnetic materials exhibit high magnetic permeability and reduce the magnetic reluctance of flux bottlenecks. In addition, high-performance magnetic materials typically saturate at a higher flux density than the conventional magnetic materials. The first piston cylinder and the second piston cylinder can be made of conventional magnetic material, such as low-carbon steel. The first piston cylinder can include a ring disposed about an end, where the end is longitudinally attached and magnetically coupled to the piston center.

    摘要翻译: 一种高性能活塞芯,包括第一活塞气缸和第二活塞气缸,活塞中心纵向设置在第一活塞气缸和第二活塞气缸之间,并且磁性联接。 活塞中心由钴(CoFe),硅钢(SiFe),钒/钴钢(Permendur),合金等高性能磁性材料制成。 高性能磁性材料具有高磁导率,降低了磁通量瓶颈的磁阻。 此外,高性能磁性材料通常以比常规磁性材料更高的磁通密度饱和。 第一活塞缸和第二活塞缸可由常规的磁性材料制成,例如低碳钢。 第一活塞气缸可以包括围绕端部设置的环,其中端部纵向附接并且磁耦合到活塞中心。