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公开(公告)号：US10008892B2
公开(公告)日：2018-06-26
申请号：US14403164
申请日：2013-03-27
发明人： Isao Nakagawa , Manabu Nonaka
摘要： An IPM motor for a vacuum pump suitable for use as a motor for a small vacuum pump is provided. The IPM motor for a vacuum pump includes: a rotor core in which a rotor shaft of the vacuum pump is pressed and which also has magnets embedded therein; and a stator core which surrounds the rotor core and around which stator windings are wound. The magnets per pole embedded in the rotor core are each split into two pieces and inserted in respective magnet slots in the rotor core. A hole for stress concentration relaxation is provided at either end of each pair of magnet slots in which permanent magnets split into two pieces are embedded in each pole. The rotor core has a multilayer structure having a plurality of rotor core laminations stacked vertically in an axial direction of the rotor shaft. The rotor core laminations stacked vertically are positioned with a skew angle determined by using the holes for stress concentration relaxation.
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公开(公告)号：US20150108867A1
公开(公告)日：2015-04-23
申请号：US14403164
申请日：2013-03-27
发明人： Isao Nakagawa , Manabu Nonaka
CPC分类号： H02K1/276 , F04B37/14 , F04D19/042 , F04D25/0606 , H02K7/14 , H02K21/16 , H02K2201/06
摘要： An IPM motor for a vacuum pump suitable for use as a motor for a small vacuum pump is provided. The IPM motor for a vacuum pump includes: a rotor core in which a rotor shaft of the vacuum pump is pressed and which also has magnets embedded therein; and a stator core which surrounds the rotor core and around which stator windings are wound. The magnets per pole embedded in the rotor core are each split into two pieces and inserted in respective magnet slots in the rotor core. A hole for stress concentration relaxation is provided at either end of each pair of magnet slots in which permanent magnets split into two pieces are embedded in each pole. The rotor core has a multilayer structure having a plurality of rotor core laminations stacked vertically in an axial direction of the rotor shaft. The rotor core laminations stacked vertically are positioned with a skew angle determined by using the holes for stress concentration relaxation.
摘要翻译： 提供一种适用于小型真空泵电机的真空泵用IPM电机。 用于真空泵的IPM电动机包括：转子芯，其中真空泵的转子轴被按压并且其中嵌入有磁体; 以及定子铁心，其围绕转子铁心并围绕其缠绕定子绕组。 嵌入在转子芯中的每极的磁体分别分成两部分并插入到转子芯中的各个磁体槽中。 在每对磁体槽的任一端设置有用于应力集中松弛的孔，其中分成两部分的永磁体嵌入每个磁极中。 转子芯具有多层结构，其具有沿转子轴的轴向垂直堆叠的多个转子铁心叠片。 垂直堆叠的转子铁芯叠层通过使用用于应力集中放松的孔确定的倾斜角定位。
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公开(公告)号：US20160312826A1
公开(公告)日：2016-10-27
申请号：US15028095
申请日：2014-09-10
发明人： Toshiaki Kawashima , Isao Nakagawa
CPC分类号： F16C32/0402 , F01D25/16 , F04D19/042 , F04D19/048 , F04D27/00 , F04D29/058 , F04D29/059 , F05D2240/30 , F05D2240/511 , F05D2240/515 , F05D2260/941 , F16C19/06 , F16C32/0442 , F16C39/02 , F16C2300/62 , F16C2360/45
摘要： To provide a protective bearing, a bearing unit, and a vacuum pump that are configured to prevent a touchdown bearing from co-rotating with the rotation of a rotor that is supported in a levitated state and a non-contact state. Slits are formed in the radial direction at four sections on the inner side of a securing member. A pair of permanent magnets of the same polarity is fixed to the upper surface of each of the four regions partitioned by the slits. The inner rim of the securing member has projections that are formed circumferentially downward. An attractive force is generated between an outer ring and an inner ring. An attractive force is also generated between the projections projecting toward the inner end of the securing member and the inner ring. Due to this configuration, even when a rotational torque is applied to the inner ring of the touchdown bearing as a result the rotation of the rotating body, co-rotation of the inner ring does not occur due to a large holding torque.
摘要翻译： 提供一种保护轴承，轴承单元和真空泵，其构造成防止触地轴承随着处于悬浮状态和非接触状态的转子的旋转而共旋转。 在固定部件的内侧的四个部位沿径向形成狭槽。 一对具有相同极性的永磁体被固定在由狭缝分隔的四个区域中的每一个的上表面上。 固定构件的内缘具有周向形成的突起。 在外环和内圈之间产生吸引力。 在朝向固定构件的内端突出的突起与内圈之间也产生吸引力。 由于这种构造，即使当转向力矩被施加到触地轴承的内圈时，由于旋转体的旋转，即使由于大的保持转矩而不会发生内圈的共同转动。
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