WO1996013891A1 - Nouvelle structure de generateur - Google Patents

Nouvelle structure de generateur Download PDF

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Publication number
WO1996013891A1
WO1996013891A1 PCT/CN1995/000084 CN9500084W WO9613891A1 WO 1996013891 A1 WO1996013891 A1 WO 1996013891A1 CN 9500084 W CN9500084 W CN 9500084W WO 9613891 A1 WO9613891 A1 WO 9613891A1
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WO
WIPO (PCT)
Prior art keywords
rotor
stator
generator according
windings
generator
Prior art date
Application number
PCT/CN1995/000084
Other languages
English (en)
French (fr)
Inventor
Xiabin Bai
Xibin Zhang
Original Assignee
Xiabin Bai
Xibin Zhang
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xiabin Bai, Xibin Zhang filed Critical Xiabin Bai
Priority to DE69528191T priority Critical patent/DE69528191T2/de
Priority to EP95936414A priority patent/EP0790696B1/en
Priority to CA002203189A priority patent/CA2203189C/en
Priority to GB9708281A priority patent/GB2311173B/en
Priority to AU38384/95A priority patent/AU706924B2/en
Priority to JP8514217A priority patent/JPH10507898A/ja
Priority to US08/836,477 priority patent/US5925959A/en
Publication of WO1996013891A1 publication Critical patent/WO1996013891A1/zh

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/278—Surface mounted magnets; Inset magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28—Layout of windings or of connections between windings

Definitions

  • the invention relates to a special winding, multi-pole and permanent magnet generator. Especially suitable for variable frequency generators. Background technique
  • the object of the present invention is to provide a new generator with small volume, large output power and material saving.
  • the invention improves the stator and rotor structure of the original generator.
  • the stator cross-section is made rectangular, and the tooth cross-section is made fan-shaped, which increases the effective area of the armature core and increases the total effective magnetic flux.
  • the stator coil windings have open-loop square waveforms with different intercepts. This reduces the length of the end coils and reduces the internal resistance of the coil windings.
  • a permanent magnet pole is laid on the rotor yoke, and a slit is formed on the rotor yoke and its permanent magnet pole along the rotor axis. The slit microphone greatly reduces the iron loss of the generator and improves the use efficiency.
  • the number of teeth of the stator is increased to an integral multiple of 3, and the number of teeth and the number of rotor poles is an integer multiple of 3.
  • the distance between the permanent magnetic poles laid on the rotor is equal to the width of a slot on the stator.
  • the thickness of the permanent magnetic poles laid on the rotor is 7-8 times the air gap between the rotor and the stator.
  • the two ends of the permanent magnetic poles laid on the rotor are made wedge-shaped and fixed to the surface of the rotor with an adhesive.
  • the wedge-shaped part is covered by the rotor.
  • the overburden is buckled, and the buckled part does not exceed one quarter of the thickness of the magnetic pole.
  • the length of the slot microphone opened in the rotor axial direction of the rotor yoke and the permanent magnet magnetic pole is greater than one half of the axial length of the permanent magnet magnetic pole.
  • Rotor yoke and permanent magnet pole, the width of the gap opened along the axial direction of the rotor is 0. ⁇ »—The set of windings are respectively embedded in the stator line according to different intercepts.
  • Each 12 slots on the stator is a minimum unit.
  • the windings between the units can be connected in series, parallel or mixed. Multiple sets of windings can be stacked in multiple layers and embedded in the same line. Each winding can be connected in series or in parallel or the three-phase windings can be shifted and embedded in the stator line.
  • Each layer of winding wires in the stator wire is a single wire.
  • Fig. 1 is a cross-sectional view of the present invention.
  • FIG. 2 is a development schematic diagram of a stator winding wire cluster according to the present invention.
  • FIG. 3 is a structural diagram of a rotor and a permanent magnetic pole of the present invention. The best way to implement the invention
  • the present invention includes two parts of a stator 1 and a rotor 5.
  • the cross section 3 of the upper slot of the stator 1 is rectangular, and the cross section of the upper teeth 2 of the stator 1 is ⁇ -shaped.
  • the stator winding clumps 4 are embedded in line 3, the clump structure is an open-loop square waveform, and each layer of winding wire 4 is a single wire.
  • the number of wires ⁇ 3 and teeth 2 on the stator 1 is an integral multiple of 3, and the number of teeth is an integral multiple of 3 of the rotor magnetic poles.
  • the rotor 5 is provided with permanent magnet pole pieces 6, and there is a gap distance 7 between the permanent magnet pole pieces 6.
  • FIG. 2 is a developed view of a stator wire winding of the present invention.
  • the shape of the stator winding cluster is an open-loop square wave.
  • a set of A, B, C, and windings have different intercepts. They are respectively embedded in the stator slots according to different intercepts.
  • Each 12 slots on the stator is The smallest unit, the windings between units can be connected in series, parallel or mixed according to different needs.
  • Multiple sets of windings can be superimposed and embedded in the same position slot, and the windings can be connected in series, parallel or mixed.
  • the three-phase windings are respectively shifted and embedded in the stator line to obtain the three-phase output of the three-phase generator.
  • the magnetic poles on the rotor are arranged in the order of N-S-N-S.
  • a permanent magnet pole 6 and a rotor yoke laid on the rotor 5 are provided with a slit microphone 8 along the axial direction of the rotor 5.
  • the purpose of the slit is to cut off the eddy current circuit on the yoke and increase the magnetic Resistance, reduce iron loss, reduce motor heating, gap 8 is to cut off all large eddy currents, its length is greater than one half of the axial length of the permanent magnet magnetic pole 6, it is not desirable to reduce the mechanical strength of the rotor
  • the width of the seam microphone 8 is 0.1 band, which is the optimal value for the experiment.
  • the distance between the permanent magnetic poles 6 laid on the rotor 5 is equal to the width of a slot on the stator.
  • the thickness of the permanent magnet pole 6 is 7-8 times that of the air microphone between the rotor and the stator. This thickness is an experimental optimal value.
  • the two ends of the permanent magnet pole 6 are made into a wedge shape, and are fixed on the surface of the rotor 5 with an adhesive.
  • the wedge portion is buckled by the hemming of the rotor 5, and the buckled portion does not exceed a quarter of the thickness of the pole.
  • Fig. 2 is a radial development view of a stator of a motor according to the present invention. among them
  • A1, A2, A3 are three sets of windings with different pitches (long dashed lines) for the windings that make up the A phase of the motor.
  • B1, B2, B3 are three sets of windings that make up the B phase of the motor.
  • FIG. 2 is an expanded view of a stator of the present invention, wherein 10, 20, 30, and 3X10n are serial numbers of teeth (slots) on the stator.
  • A is the A-phase winding of the three-phase motor
  • B is the B-phase winding of the three-phase motor
  • C is the C-phase winding of the three-phase motor.
  • the phase difference starts with the B-phase winding moved back by one slot, that is, B1-B1 'starts with the second line, B2-B2' starts with the third line, and B3-B3 'starts with the fourth line
  • the C-phase winding is moved backward by one line from the B-phase winding, that is, C1 ⁇ C1 'starts from the third slot, C2 C2' starts from the fourth slot, and C 3 ⁇ C 3 'Starting with the fifth trunking.
  • Each phase winding consists of three wires (wires) connected in series with each other. which is:
  • the output voltage of each phase is equal to the sum of the electromotive forces induced on its three lines (wires). If the induced electromotive force on each wire group (wire) is ⁇ and the phase output voltage is E, then
  • Phase A ⁇ - ⁇ ⁇ + AE M. M , + AE U. U ,
  • phase A, phase B and phase C get alternating voltages with a phase difference of 120 °.
  • the generator of the present invention can greatly reduce the weight and volume.
  • the special winding used greatly reduces the use of Tong wire, and due to the extremely small internal resistance, the external characteristics of the generator Very good. When the load is changed, the output voltage of the generator is almost unchanged, and the overload capacity is strong.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Windings For Motors And Generators (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Synchronous Machinery (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Description

新结构发电机 技术领域
本发明涉及一种特种绕組、 多极、 永磁发电机。 特别适用于变频发 电机。 背景技术
现有技术的发电机在结构上存在一些缺陷， 如： 电枢铗心线糝大， 有效磁通量小； 线團内阻大； 耗电多， 易发热； 定子绕組端部较长， 并 相互叠压； 转子涡流损耗较大等等， 对发电机的输出功率， 材料耗损， 体积大小都产生了较大的局限性， 因此限制了发电机的使用范围。 发明的公开
本发明的目的在于提供一种体积小， 输出功率大， 节省材料的新发 电机。
本发明在原有发电机的定子、 转子结构的基础上进行了改良。 把定 子的线稽截面制作为矩形， 齿的截面制作为扇形， 这样增大了电枢铁心 的有效面积， 提高了总有效磁通量。 定子线團绕組为不同截矩的开环方 波形， 这样一则减小了端部线團的长度， 同时又减小了线團绕組的内阻。 转子磁轭上敷设有永磁磁极， 并沿转子轴向在转子磁轭及其永磁磁极上 开有缝眯， 缝咪使发电机的铁损大大减少， 提高了使用效率。 定子的榷 齿数增为 3的整倍数， 齿数与转子磁极数为 3的整倍数。 转子上敷设的永 磁磁极之间距离等于定子上一个槽的宽度。 转子上敷设永磁磁极的厚度 为其转子与定子之间气隙的 7 - 8倍， 转子上敷设的永磁磁极的两端制成 楔形， 用粘合剂固定在转子表面， 楔形部分被转子的包边扣死， 被扣部 分不超过磁极厚度的四分之一。 转子磁轭及永磁磁极沿转子轴向开通的 缝咪长度大于永磁磁极轴向长度的二分之一。 转子磁轭及永磁磁极， 沿 转子轴向开通的缝隙的宽度为 Ο. ΐπιιη» —套绕組分别按照不同截矩镶嵌 在定子线橫中， 定子上每 12个线槽为一最小单元， 单元之间的绕組可串 联、 并联或混^ 多套绕组重叠多层锒嵌在相同位置的线橫内， 各绕組 之间可串 $ 并联或 三相绕组分别移位锒嵌在定子线稽内。 定子 线橫内每层绕組线團为单根导线。 1 一 2 一 本发明与现有技术相比， 具有体积小， 制造工艺简单， 节省材料， 提高发电机效率等优点。 附图的简要说明
图 1是本发明的橫截面剖视图。
图 2是本发明定子绕組线團的展开示意图。
图 3是本发明转子及其永磁磁极的结构图。 实现本发明的最佳方式
如图 1所示， 本发明包括定子 1和转子 5两大部分， 定子 1上槽的截面 3为矩形， 定子 1上齿 2截面为扃形。 定子绕組线團 4镶嵌在线榷 3内， 线 團结构为开环方波形， 每层绕組线围 4为单根导线。 定子 1上的线楕 3和 齿 2的数量为 3的整倍数， 齿数为转子磁极数的 3整倍数。 转子 5上敷设有 永磁极片 6， 永磁极片 6之间有间隔距离 7, 每一永磁极片 6与转子 5上的 磁轭开有缝隙 8。 转子 5为空心构架 9， 转子 5的轴 10与动力机传动连接。 当动力机带动转子旋转时， 发电机开始启动发电， 向负栽输出功率。 图 2是本发明定子线¾绕组的展开图。 定子绕組线團形状为开环方波， 一 套 A, B, C , 绕組， 具有不同的截矩， 它们分别按照不同截矩镶嵌在定子 线槽中， 定子上每 12个线槽为最小单元， 单元之间的绕组根据不同需要 可以串联、 并联或混联。 多套绕組可以重叠镶嵌在相同位置槽内， 各绕 組之间可串联、 并联或混联， 三相绕组分别移位镶嵌在定子线橫内， 得 到三相发电机的三相输出。 转子上的磁极按照 N- S -N- S的规律排列。 图 3 中的转子结构， 转子 5上敷设的永磁磁极 6与转子磁轭， 沿转子 5的轴向 开有缝咪 8, 开缝的目的是切断磁轭上的涡流的回路， 增大磁阻， 减小 铁损， 减小电机发热， 缝隙 8是为了切断全部大循环的涡流， 其长度大 于永磁磁极 6轴向长度的二分之一， 若再大会减低转子的机械强度， 不 可取， 缝咪 8的宽度为 0. 1匪， 为实验最佳值。 转子 5上敷设的永磁磁极 6 相互之间的距离等于定子上的一个槽的宽度。 永磁磁极 6的厚度为其转 子与定子之间气咪的 7 - 8倍， 这一厚度是一实验最佳值， 如厚度太大， 则浪费磁材料， 太小会使电机功率下降。 永磁磁极 6两端制成楔形， 用 粘合剂固定在转子 5表面， 楔形部分被转子 5的包边扣死， 被扣部分不超 过磁极厚度的四分之一。
下面进一步结合附图详细说明本发明的结构特点及其效果。
导导线
-3 一 图 2是本发明电机定子径向展开图。 其中
1、 (1), (2) , (N)为定子上的齿；
2、 （1) ', (2)', , (N)'为定子上的榷;
3、 （实线） A1,A2, A3为組成电机 A相的一套绕组共三根不同节距的导 (长虚线） B1,B2,B3为組成是电机 B相的一套绕組共三根不同节距的
； (短虚线） C1,C2,C3 为组成电机 C相的一套绕组共三根不同节距的 o
图 2为本发明定子的展开图， 其中， 10,20,30, ,3X10n是定 子上的齿（槽）的序号。 A为三相电机的 A相绕組， B为三相电机的 B相绕組， C为三相电机 C相绕組。 每一相绕組都是由三个不同节距的方波型线圏 (导线）組成， 即 A相（实线表示）： A1→A1'、 A2→A2'、 A3—A3', B相（长 虚线表示）： Β1→Β1'、 Β2→Β2'、 Β3~»Β3'β C相（短虚线表示）： Cl→ Cl'、 C2→C2'、 C3— C3', 他们分别依次镶嵌在线稽内， A相： Al— A1' 由第一个线槽开始， Α2→Α2'由第二个线榷开始， A3— A3'由第三个线槽 开始。 为了保证三相绕組具有 120。 的相位差， Β相绕組后移一个线槽起 始， 即 B1—B1'由第二个线榷开始， Β2— B2'由第三个线槽开始， Β3— B3' 由第四个线糟开始， 同理 C相绕組相对 Β相绕組后移一个线稽开始， 即 C1 →C1'由第三个线槽开始， C2 C2'由第四个线槽开始， C3→C3'由第五 个线槽开始。
每相绕组由三个线團（导线）互相串联构成。 即：
A組绕組： （A1→A1')→ (A2~- A2')→(A3— A3')
B組绕組： （Β1→Β1')→(Β2→ Β2')→(Β3→· Β3')
C组绕組： （Cl—Cl')— (C2— C2')-*(C3— C3')
因此每相输出电压就等于其三个线围（导线）上感生的电动势的总和。 若设每个线團（导线）上的感应电动势为 ΔΕ, 相输出电压为 E， 则
A相： Ε-ΔΕ^^ + AEM.M,+AEU.U,
B3-B3'
C相： Ec=AEa.a, + ΔΕ^+ΔΕ^,
下面结合图 2对本发明三相发电机的工作过程说明如下：
假定发电机转子上的磁极 Ν, 在1\时刻处于定子的第 1,2, 3齿（榷）的 正下方， 这时由于磁极同时切割： Α1→Α1'、 Α2→Α2'、 A3— Α3'， 则 Α相 绕組电压达到最大值，
Figure imgf000005_0001
转子继续转 动， 当在 ΤΒ时刻， 该磁极处于定子的第 2.3.4齿 （槽） 的正下方时， 由 于同时切割线團 （导线） Β1→Β1 '、 Β2→Β2 ' Β3→Β3 ' , 所以 Β相绕阻电 压达到最大值， 即：
Figure imgf000006_0001
同理当转子上该 磁极转动到定子的第 3, 4. 5齿 （槽） 下面时， 同时切割 C相线團 （导线） C1→C1 '、 C2→C2 '、 C3→C3' , 所以 C相绕組电压达到表大值： E^E^ △ΕΑ.Α. + ΔΕ^^+ΔΕ^^, 转子继续转动， 磁极相对定子上的绕组不断位 移， 三相电压 EA, EB, Ec也在不断的变化。 当 S极正处在定子的第 1. 2. 3. 齿 （槽） 下面时， A相绕組上出现反向最大值， 即电压最小值：
A1-A1'
则 Α相， B相， C相的输出端得到相位差 120° 的交变电压。
本发明的发电机， 与功率相同的常规发电机相比， 重量和体积可以 大为减少， 采用的特种绕組使桐线的使用量大大减少， 并由于内阻极小， 发电机的外部特性非常好， 当负栽变化时， 而发电机的输出电压几乎不 变， 过栽能力强。

Claims

权利要求书
1. 一种新结构发电机， 由定子、 转子组成，
其特征在于 定子的线槽截面为矩形， 齿的截面为扇形； 转子磁 轭及其上敷设的永磁磁极沿转子轴向开有缝陈； 定子绕組线團为不同截 矩的开环、 方波形。
2. 根据权利要求 1所述的发电机，
其特征在于 定子的槽齿数均为 3的整倍数， 齿数为转子磁极数 3 的整倍数。
3. 根据权利要求 1所述的发电机，
其特征在于 转子上敷设的永磁磁极之间距离等于定子上一个槽 的宽度。
4. 根据权利要求 3所述的发电机，
其特征在于 转子上敷设永磁磁极的厚度为其转子与定子之间气 咪的 7 - 8倍。
5. 根据权利要求 4所述的发电机，
其特征在于 转子上敷设的永磁磁极的两端制成楔形， 用粘合剂 固定在转子表面， 楔形部分被转子的包边扣死， 被扣部分不超过磁极厚 度的四分之一。
6. 根据权利要求 1或 3或 4或 5所述的发电机，
其特征在于 转子磁轭及永磁磁极沿转子轴向开通的缝咪长度大 于永磁磁极轴向长度的二分之一。
7. 根据权利要求 6所述的发电机，
其特征在于 转子磁轭及永磁磁极， 沿转子轴向开通的缝咪的宽 度为。 . ΐπιπς
8. 根据权利要求 1所述的发电机， 其特征在于 一套绕组分别按照不同截矩镶嵌在定子线槽中， 定 子上每 12个线橫为一最小单元， 单元之间的绕組可串联、 并联或混联。
9. 根据权利要求 8所述的发电机，
其特征在于 多套绕 '組重叠多层镶嵌在相同位置的线稽内， 各绕 組之间可串联、 并联或混 ^„
10. 根据权利要求 8或 9所述的发电机，
其特征在于 三相绕組分别移位镶嵌在定子线橫内。
11. 根据权利要求 8所述的发电机，
其特征在于 定子线槽内每层绕组线團为单根导线
PCT/CN1995/000084 1994-10-31 1995-10-30 Nouvelle structure de generateur WO1996013891A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
DE69528191T DE69528191T2 (de) 1994-10-31 1995-10-30 Struktur eines Generators
EP95936414A EP0790696B1 (en) 1994-10-31 1995-10-30 Generator structure
CA002203189A CA2203189C (en) 1994-10-31 1995-10-30 An electric generator with novel structure
GB9708281A GB2311173B (en) 1994-10-31 1995-10-30 An Electric Generator
AU38384/95A AU706924B2 (en) 1994-10-31 1995-10-30 An electric generator
JP8514217A JPH10507898A (ja) 1994-10-31 1995-10-30 新規な構造の発電機
US08/836,477 US5925959A (en) 1994-10-31 1995-10-30 Electric generator with novel structure

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN94116889.1A CN1106584A (zh) 1994-10-31 1994-10-31 新结构发电机
CN94116889.1 1994-10-31

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Publication Number Publication Date
WO1996013891A1 true WO1996013891A1 (fr) 1996-05-09

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PCT/CN1995/000084 WO1996013891A1 (fr) 1994-10-31 1995-10-30 Nouvelle structure de generateur

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US (1) US5925959A (zh)
EP (1) EP0790696B1 (zh)
JP (1) JPH10507898A (zh)
CN (1) CN1106584A (zh)
AU (1) AU706924B2 (zh)
CA (1) CA2203189C (zh)
DE (1) DE69528191T2 (zh)
GB (1) GB2311173B (zh)
WO (1) WO1996013891A1 (zh)

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AU2002952687A0 (en) * 2002-11-15 2002-11-28 In Motion Technologies Pty Ltd Poly-phase electromagnetic device having improved conductor winding arrangement
AU2003295193A1 (en) * 2003-12-03 2005-06-24 Tower Light S.R.L. Alternator
DE102005032478A1 (de) * 2005-07-12 2007-01-18 Robert Bosch Gmbh Verfahren zum Herstellen einer Wicklung einer elektrischen Maschine
CN1933286B (zh) * 2006-08-29 2012-05-23 林祥钟 一种新型永磁无刷直流四象限电机
EP2110547A1 (en) 2008-04-17 2009-10-21 Aratec Engenharia, Consultoria E Representações Ltda. Assembly of hydraulic turbine and electrical generator
RU2453725C2 (ru) * 2008-05-26 2012-06-20 Аратек Энженариа Консульториа Э Репрезентасойнс Лтда. Электрогенерирующее устройство
CN102969816A (zh) * 2012-12-14 2013-03-13 山东理工大学 一种汽车用三相短距绕组永磁交流发电机
GB2519214B8 (en) 2013-10-10 2017-03-01 Kirloskar Integrated Tech Ltd A power generation system
EP3514920B1 (en) * 2018-01-17 2020-07-08 ABB Schweiz AG A stator core or a rotor core for an electrical machine with reduced eddy current losses and high magnetic conductivity and mechanical strength
CN108551214B (zh) * 2018-04-20 2020-09-22 峰岹科技(深圳)股份有限公司 三相电机
RU2697506C1 (ru) * 2018-11-01 2019-08-15 федеральное государственное автономное образовательное учреждение высшего образования "Южно-Уральский государственный университет (национальный исследовательский университет)" Электрогенерирующее устройство
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Also Published As

Publication number Publication date
DE69528191D1 (de) 2002-10-17
EP0790696A1 (en) 1997-08-20
US5925959A (en) 1999-07-20
GB2311173A (en) 1997-09-17
EP0790696A4 (en) 2000-08-30
AU3838495A (en) 1996-05-23
CN1106584A (zh) 1995-08-09
GB2311173B (en) 1998-05-13
AU706924B2 (en) 1999-07-01
CA2203189C (en) 2000-10-03
GB2311173A8 (en) 1997-09-17
GB9708281D0 (en) 1997-06-18
DE69528191T2 (de) 2003-04-30
JPH10507898A (ja) 1998-07-28
CA2203189A1 (en) 1996-05-09
EP0790696B1 (en) 2002-09-11

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