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Patent Agency Ranking
公开(公告)号：US20140252910A1
公开(公告)日：2014-09-11
申请号：US14198843
申请日：2014-03-06
Applicant: Hitachi, Ltd.
Inventor： Naoki KUNIHIRO , Kazuo NISHIHAMA , Motonobu IIZUKA , Kenichi SUGIMOTO , Masanori SAWAHATA , Akiyoshi KOMURA
IPC: H02K17/16
CPC classification number: H02K17/165 , H02K2213/03
Abstract: There is provided an induction machine having a squirrel-cage rotor, the rotor including: a rotor core; a plurality of rotor slots formed on the rotor core and aligned circumferentially at a predetermined interval; a plurality of rotor bars inserted into one of the plurality of rotor slots; and a plurality of rotor slits formed adjacent to the plurality of rotor slots on an outer circumferential side of the rotor core. The each rotor slit is formed as a hollow such that a cross sectional shape thereof is distinguished into three parts of a slit outer circumferential part, a slit intermediate part, and a slit inner circumferential part. A circumferential width of the each rotor slit on an innermost circumferential side is larger than that on an outermost circumferential side. A circumferential width of the slit intermediate part increases from an outer circumferential side toward an inner circumferential side.
Abstract translation: 提供了一种具有鼠笼式转子的感应电机，转子包括：转子芯; 多个转子槽，形成在所述转子铁心上并以预定的间隔圆周对准; 多个转子杆插入所述多个转子槽中的一个中; 以及在所述转子铁芯的外周侧与所述多个转子槽相邻地形成的多个转子狭缝。 每个转子狭缝形成为中空，使得其横截面形状被区分为狭缝外周部分，狭缝中间部分和狭缝内周部分的三个部分。 在最内圆周侧的每个转子狭缝的周向宽度大于最外周侧的周向宽度。 狭缝中间部的周向宽度从外周侧向内周侧增大。
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公开(公告)号：US20220224270A1
公开(公告)日：2022-07-14
申请号：US17598067
申请日：2020-03-23
Applicant: Hitachi, Ltd.
Inventor： Shinji SUGIMOTO , Akeshi TAKAHASHI , Kazuo NISHIHAMA
Abstract: A winding switching device switches parallel and series connections of windings of a rotating electric machine, and includes a plurality of electrodes that are connected to the windings and a power source, a movable portion in contact with the plurality of electrodes and includes a plurality of conductor portions, and an actuator that drives the movable portion. According to a contact state between the plurality of electrodes and the plurality of conductor portions, the windings are connected in parallel at a first position of the movable portion, and are connected in series at a second position of the movable portion. The electrodes include a first electrode connected to a first phase winding of the rotating electric machine in the plurality of windings, and a second electrode connected to a second phase winding. The first electrode and the second electrode are adjacent to each other, and form a neutral point.
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公开(公告)号：US20220006411A1
公开(公告)日：2022-01-06
申请号：US17280422
申请日：2019-06-21
Applicant: HITACHI, LTD.
Inventor： Akeshi TAKAHASHI , Shinji SUGIMOTO , Kazuo NISHIHAMA
Abstract: A rotary machine driving system includes: a rotary machine including a plurality of coils; an inverter device configured to operate the rotary machine at a variable speed, including a control device for controlling power conversion by an inverter circuit, and a coil switching device for switching a connection of the coils according to the control device. The control device commands the coil switching device to switch the connection of the coils when rotation of the rotary machine transitions between a low-speed rotation range and a high-speed rotation range due to acceleration and deceleration. A starting end and a terminal end of at least one set of coils per phase of the rotary machine are drawn out in a freely connectable state. The coil switching device includes at least one movable portion driven by one actuator.
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公开(公告)号：US20170187264A1
公开(公告)日：2017-06-29
申请号：US15381766
申请日：2016-12-16
Applicant: Hitachi, Ltd.
Inventor： Daisuke KORI , Ryuichiro IWANO , Masanori SAWAHATA , Kazuo NISHIHAMA , Motonobu IIZUKA , Takayuki KOYAMA , Kenichi SUGIMOTO
Abstract: The invention provides a rotating electrical machine system in which an air volume of a refrigerant is increased near the center of a rotating electrical machine in the axial direction is improved. The rotating electrical machine includes a rotor and a stator, in which the stator core, laminated electromagnetic steel sheets formed by laminating a plurality of electromagnetic steel sheets in the axial direction are divided into a plurality of sets of packet cores, and between one of the packet cores of the plurality of sets and another packet core adjacent to it, there is formed a duct providing a flow channel of the stator, and in a duct situated at the center side from both ends in the axial direction among the duct, there is a portion of two packet cores facing each other across the duct, a diameter direction length of the two packet cores becoming long.
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公开(公告)号：US20190140530A1
公开(公告)日：2019-05-09
申请号：US16096552
申请日：2017-07-31
Applicant: Hitachi, Ltd.
Inventor： Kazuo NISHIHAMA , Masanori SAWAHATA , Takayuki KOYAMA , Makoto IMURA , Yuuichirou YOSHITAKE , Kenichi SUGIMOTO , Kengo UEDA
Abstract: There is provided a rotary electric machine that ensures improving a maximum torque and a rated power factor while reducing an increase in a starting current. In view of this, the rotary electric machine includes a shaft, a rotor, and a stator. The rotor is fixed to an outer periphery of the shaft. The stator is located so as to surround an outer periphery of the rotor. The rotor includes a rotor iron core including a plurality of rotor slots located at predetermined intervals in a circumferential direction and rotor bars inserted into the rotor slots. Rotor slits communicate with outer peripheral sides of the rotor slots. The rotor slits have a width ws in a circumferential direction. The width ws is smaller than a height hs in a radial direction of the rotor slit, and when a rated current is denoted as I1, a turn ratio (primary/secondary) is denoted as Tr, and a magnetic permeability in a vacuum is denoted as μ0, a relationship of ws>μ0×I1×Tr/0.6 is met.
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