公开(公告)号：US06664683B1

公开(公告)日：2003-12-16

申请号：US09493983

申请日：2000-01-28

申请人： Hirokazu Yashiro ,  Youichi Kuwayama

发明人： Hirokazu Yashiro ,  Youichi Kuwayama

IPC分类号： H02K516

CPC分类号： F04D29/057 ,  F04D19/04 ,  F04D29/023 ,  F05D2300/20 ,  F05D2300/50212 ,  F16C17/02 ,  F16C17/026 ,  F16C33/107 ,  F16C2360/45 ,  H02K7/088 ,  H02K7/09 ,  H02K7/14 ,  H02K21/14

摘要： A compact turbo-molecular pump having a high depressurizing capability. A motor for rotating a rotor vane includes an air bearing. The air bearing has a rotary cylinder and a fixed surface surrounding the rotary cylinder. The material of the rotary cylinder has a coefficient of thermal expansion that is smaller than that of the material of the fixed surface. Thus, change in the dimensions of the rotary cylinder is smaller than that of the fixed surface even if the temperature of the air bearing rises during operation of the pump. Thus, the rotary cylinder avoids contact with the fixed surface.

摘要翻译： 具有高减压能力的紧凑型涡轮分子泵。 用于旋转转子叶片的电动机包括空气轴承。 空气轴承具有旋转圆筒和围绕旋转圆筒的固定表面。 旋转圆筒的材料的热膨胀系数小于固定表面材料的热膨胀系数。 因此，即使在泵的运行期间空气轴承的温度上升，旋转圆筒的尺寸的变化也小于固定表面的尺寸。 因此，旋转圆筒避免与固定表面的接触。

公开(公告)号：US06815855B2

公开(公告)日：2004-11-09

申请号：US10636422

申请日：2003-08-06

申请人： Hirokazu Yashiro ,  Youichi Kuwayama

发明人： Hirokazu Yashiro ,  Youichi Kuwayama

IPC分类号： H02K708

CPC分类号： F04D29/057 ,  F04D19/04 ,  F04D29/023 ,  F05D2300/20 ,  F05D2300/50212 ,  F16C17/02 ,  F16C17/026 ,  F16C33/107 ,  F16C2360/45 ,  H02K7/088 ,  H02K7/09 ,  H02K7/14 ,  H02K21/14

摘要： A compact turbo-molecular pump having a high depressurizing capability. A motor for rotating a rotor vane includes an air bearing. The air bearing has a rotary cylinder and a fixed surface surrounding the rotary cylinder. The material of the rotary cylinder has a coefficient of thermal expansion that is smaller than that of the material of the fixed surface. Thus, change in the dimensions of the rotary cylinder is smaller than that of the fixed surface even if the temperature of the air bearing rises during operation of the pump. Thus, the rotary cylinder avoids contact with the fixed surface.

公开(公告)号：US06784580B2

公开(公告)日：2004-08-31

申请号：US10288120

申请日：2002-11-05

申请人： Hirokazu Yashiro ,  Youichi Kuwayama

发明人： Hirokazu Yashiro ,  Youichi Kuwayama

IPC分类号： F04D1904

CPC分类号： F04D19/042 ,  F04D19/048 ,  F04D29/0516 ,  F04D29/057 ,  F16C17/026 ,  F16C32/044 ,  F16C33/107 ,  F16C2360/45 ,  H02K7/088 ,  H02K7/09 ,  H02K7/14

摘要： A compact turbo-molecular pump having a high depressurizing capability. A motor driving the pump includes a rotary shaft, the distal and basal ends of which are supported by magnetic bearings. Each magnetic bearing has a rotated magnet, which is rotated integrally with the rotary shaft, and a fixed magnet, which is opposed to the rotated magnet. The rotated and fixed magnets repel each other. The diameter of the magnetic bearing at the distal end of the rotary shaft is greater than that of the magnetic bearing at the basal end. This decreases movement of the rotary shaft toward its distal end when the pump operates.

摘要翻译： 具有高减压能力的紧凑型涡轮分子泵。 驱动泵的电动机包括旋转轴，其远端和底端由磁性轴承支撑。 每个磁性轴承具有与旋转轴一体旋转的旋转磁体和与旋转的磁体相对的固定磁体。 旋转和固定的磁体彼此排斥。 旋转轴远端的磁性轴承的直径大于基端的磁性轴承的直径。 当泵工作时，这减少了旋转轴朝向其远端的运动。

公开(公告)号：US06498410B1

公开(公告)日：2002-12-24

申请号：US09536569

申请日：2000-03-28

申请人： Hirokazu Yashiro ,  Youichi Kuwayama

发明人： Hirokazu Yashiro ,  Youichi Kuwayama

IPC分类号： F04B3900

CPC分类号： F04D19/042 ,  F04D19/048 ,  F04D29/0516 ,  F04D29/057 ,  F16C17/026 ,  F16C32/044 ,  F16C33/107 ,  F16C2360/45 ,  H02K7/088 ,  H02K7/09 ,  H02K7/14

摘要： A compact turbo-molecular pump having a high depressurizing capability. A motor driving the pump includes a rotary shaft, the distal and basal ends of which are supported by magnetic bearings. Each magnetic bearing has a rotated magnet, which is rotated integrally with the rotary shaft, and a fixed magnet, which is opposed to the rotated magnet. The rotated and fixed magnets repel each other. The diameter of the magnetic bearing at the distal end of the rotary shaft is greater than that of the magnetic bearing at the basal end. This decreases movement of the rotary shaft toward its distal end when the pump operates.

摘要翻译： 具有高减压能力的紧凑型涡轮分子泵。 驱动泵的电动机包括旋转轴，其远端和底端由磁性轴承支撑。 每个磁性轴承具有与旋转轴一体旋转的旋转磁体和与旋转的磁体相对的固定磁体。 旋转和固定的磁体彼此排斥。 旋转轴远端的磁性轴承的直径大于基端的磁性轴承的直径。 当泵工作时，这减少了旋转轴朝向其远端的运动。

公开(公告)号：US5168186A

公开(公告)日：1992-12-01

申请号：US757341

申请日：1991-09-10

申请人： Hirokazu Yashiro

发明人： Hirokazu Yashiro

IPC分类号： F16C32/00 ,  F16C17/10 ,  F16C32/04 ,  F16C33/10 ,  F16C35/08 ,  F16C39/06 ,  H02K3/46 ,  H02K5/128 ,  H02K5/16 ,  H02K7/09 ,  H02K21/14 ,  H02K29/08

CPC分类号： F16C39/06 ,  F16C17/107 ,  F16C33/107 ,  H02K29/08 ,  H02K3/46 ,  H02K5/128 ,  H02K7/088 ,  H02K7/09

摘要： A spindle motor for high speed hand tools includes a rotor and a sleeve that is journaled about the rotor. A pressure generating mechanism creates sufficient air pressure in a clearance between the rotor and the sleeve to form a pressurized air film in the clearance when the spindle motor is in normal operation. A plurality of armature coils and a plurality of magnetic sensors for detecting magnetism of magnetic poles in the rotor are provided on the outer surface of the sleeve. The rotor has a field magnet with multiple magnetic poles. The sleeve is formed of a ceramic material whose dielectric constant is 10 or lower. The pressurized air film created by the pressure generating mechanism is sufficient to radially support the rotor so that the rotor does not significantly contact the sleeve during normal operation of the spindle motor. The armature coils cooperate with the field magnet to rotate the rotor by the magnetic interaction between magnetic fields formed by the armature coils and the poles of the field magnet. The excitation of the armature coils is controlled at least in part by signals provided by the magnetic sensors.

摘要翻译： 用于高速手动工具的主轴电机包括转子和围绕转子轴颈的套筒。 压力产生机构在转子和套筒之间的间隙中产生足够的空气压力，以在主轴电机处于正常操作时在间隙中形成加压空气薄膜。 在套筒的外表面上设置有用于检测转子中磁极的磁性的多个电枢线圈和多个磁传感器。 转子具有多个磁极的磁场。 套筒由介电常数为10或更低的陶瓷材料形成。 由压力发生机构产生的加压空气膜足以径向支撑转子，使得转子在主轴电动机的正常操作期间不会显着地接触套筒。 电枢线圈与场磁体配合，通过由电枢线圈形成的磁场和磁场磁极的磁场之间的磁相互作用来旋转转子。 电枢线圈的激励至少部分地由磁传感器提供的信号控制。

公开(公告)号：US6091216A

公开(公告)日：2000-07-18

申请号：US100231

申请日：1998-06-19

申请人： Hisashi Takahashi ,  Hirokazu Yashiro ,  Takashi Kenjo ,  Koichiro Shoji

发明人： Hisashi Takahashi ,  Hirokazu Yashiro ,  Takashi Kenjo ,  Koichiro Shoji

IPC分类号： H02P6/08 ,  H02K23/00

CPC分类号： H02P6/085

摘要： When a brushless motor is rotated at low speeds (the answer of a step S12 is YES), the brushless motor is driven by exciting a first phase coil, a second phase coil and a third phase coil by a sine wave PWM system having a phase difference of 120.degree. from each other to perform a torque control. Since the crest value of the sine wave is controlled in response to torque greatly fluctuated by a load, an out-of-phase phenomenon which is apt to occur at low rotational speeds can be previously prevented. When the brushless motor is rotated at high speeds (the answer of the step S12 is NO), the brushless motor is driven by a square wave PWM system based on a three-phase 120.degree. conduction type. Since the out-of-phase phenomenon is apt to occur as a frequency is increased when the brushless motor is driven by the sine wave PWM system, the control system is switched to a square wave PWM system to prevent the out-of-phase phenomenon. Therefore, the brushless motor can be driven smoothly without much pulsating torque over the full range of revolutions from a low speed (zero revolution) to high speeds (several tens of thousands of revolutions/min).

摘要翻译： 当无刷电动机以低速旋转（步骤S12的答案为“是”）时，通过正弦波PWM系统激励第一相线圈，第二相线圈和第三相线圈来驱动无刷电动机，该系统具有相位 相差120°进行转矩控制。 由于响应于由负载极大地波动的扭矩来控制正弦波的波峰值，因此可以预先防止在低转速下容易发生的异相现象。 当无刷电动机以高速旋转（步骤S12的答案为否）时，无刷电动机由基于三相120°导通型的方波PWM系统驱动。 由于当正弦波PWM系统驱动无刷电动机时频率增加时容易出现异相现象，因此将控制系统切换到方波PWM系统以防止异相现象 。 因此，从低速（零旋转）到高速（几万转/分钟）的全转速范围内，无刷电动机可以平稳地驱动而没有太多的脉动扭矩。