-
公开(公告)号：US20230055461A1
公开(公告)日：2023-02-23
申请号：US17794694
申请日：2020-02-26
Applicant: Mitsubishi Electric Corporation
Inventor： Tatsuya MORI , Hiroko IKEDA , Toshihiro MATSUNAGA , Kenji IKEDA , Kenta KUBO
Abstract: To provide an abnormality detection apparatus for resolver which can determine the abnormality of at least the first system, even if the period of the excitation AC voltage of the first system and the period of the excitation AC voltage of the second system are different periods, and the magnetic interference between systems occurs. An abnormality detection apparatus for resolver applies an AC voltage of a first period to a first system excitation winding; applies an AC voltage of a second period different from the first period to a second system excitation winding; calculates a first system square sum which is a sum of square values of the detection values of output signals of first system two output windings after the second period component reduction processing: and determines abnormality of first system based on whether or not the first system square sum is within a normal range of first system.
-
公开(公告)号：US20220376641A1
公开(公告)日：2022-11-24
申请号：US17629919
申请日：2019-09-26
Applicant: Mitsubishi Electric Corporation
Inventor： Tatsuya MORI , Hiroko IKEDA , Toshihiro MATSUNAGA , Kenji IKEDA , Kenta KUBO
Abstract: To provide an AC rotary machine apparatus which can determine the operation stop of the control circuit of the other system with good accuracy. An AC rotary machine apparatus, including: a resolver is provided with a first system excitation winding, first system two output windings, a second system excitation winding, and second system two output windings, in which a magnetic interference occurs between a first system and a second system; a first system control circuit that applies AC voltage with a first period to the first system excitation winding; and a second system control circuit that applies AC voltage with a second period to the second system excitation winding, wherein the first system control circuit determines whether the operation of the second system control circuit stops, based on the components of the second period extracted from the first system output signals.
-
公开(公告)号：US20180248433A1
公开(公告)日：2018-08-30
申请号：US15759845
申请日：2016-02-26
Applicant: MITSUBISHI ELECTRIC CORPORATION
Inventor： Kodai OKAZAKI , Masatsugu NAKANO , Kazumasa ITO , Yu HIROTANI , Hiroko IKEDA , Koji KAWAMURA
Abstract: In the armature winding of a rotary electric machine, in a series coil portion group, the numbers of turns of conducting wire in the coil portions that have an electrical angular phase difference of θk that satisfies θ1
-
公开(公告)号：US20230378832A1
公开(公告)日：2023-11-23
申请号：US18030825
申请日：2020-10-27
Applicant: MITSUBISHI ELECTRIC CORPORATION
Inventor： Yu HIROTANI , Kenta MOTOYOSHI , Hiroko IKEDA , Shohei FUJIKURA
CPC classification number: H02K1/278 , H02K1/02 , H02K16/02 , H02K2213/03 , H02K2201/03
Abstract: In an electric rotating machine according to this application, a maximum height of a permanent magnet in a rotor and a flange-part root radial thickness of the tooth portion in the stator can be set properly, so that it is possible to eliminate unbalanced magnetic saturation at flange parts of the heads of the tooth portions. This makes it possible to reduce an unbalance between torque ripples that are generated respectively by an upper-side rotor block and a lower-side rotor block when an electric power steering apparatus is driven under static steering conditions, to thereby achieve an electric rotating machine with a suppressed torque ripple. With the use of this electric rotating machine, since the torque-ripple unbalance is reduced, it is possible to achieve an electric power steering apparatus with a suppressed torque ripple.
-
公开(公告)号：US20230318488A1
公开(公告)日：2023-10-05
申请号：US18011739
申请日：2020-07-22
Applicant: Mitsubishi Electric Corporation
Inventor： Tatsuya MORI , Hiroko IKEDA , Kenta KUBO , Yu HIROTANI
IPC: H02M7/5387 , H02M1/088 , H02M1/00 , H02M1/12
CPC classification number: H02M7/53873 , H02M1/12 , H02M1/0022 , H02M1/088
Abstract: If a current detection resistance (8) is connected between a lower-arm switching element (SN) and a negative-electrode-side input terminal of an inverter (6), a conduction resistance (Rp) between an output terminal and a positive-electrode-side input terminal of the inverter (6) is set to be higher than a conduction resistance (Rn) obtained by excluding the current detection resistance from a conduction resistance between the output terminal and the negative-electrode-side input terminal of the inverter (6). If the current detection resistance (8) is connected between an upper-arm switching element (SP) and the positive-electrode-side input terminal, the conduction resistance (Rn) between the output terminal and the negative-electrode-side input terminal of the inverter (6) is set to be higher than a conduction resistance (Rp) obtained by excluding the current detection resistance from the conduction resistance between the output terminal and the positive-electrode-side input terminal of the inverter (6).
-
Patent Agency Ranking
公开(公告)号：US20230249742A1
公开(公告)日：2023-08-10
申请号：US18015859
申请日：2020-10-05
Applicant: Mitsubishi Electric Corporation
Inventor： Tatsuya MORI , Hiroko IKEDA , Kenta KUBO
IPC: B62D5/04
CPC classification number: B62D5/046
Abstract: To provide a controller for a rotary electric machine and an electric power steering apparatus which can suppress the error increase of the rotational angle due to the high frequency noise component included in the current detection value, while reducing the AC component error included in the sensor detection value of rotational angle, at high rotational speed. A controller for a rotary electric machine estimates an estimation actual angle deviation; calculates a detection angle deviation; calculates a control angle deviation by dividing internally between the estimation actual angle deviation and the detection angle deviation; calculates a rotational angle for control by performing feedback control so that the control angle deviation approaches 0; and makes the ratio of the estimation actual angle deviation higher than the ratio of the detection angle deviation, when the rotational speed is higher than a speed threshold value.
-
公开(公告)号：US20230208225A1
公开(公告)日：2023-06-29
申请号：US17927741
申请日：2020-08-20
Applicant: Mitsubishi Electric Corporation
Inventor： Hidenori SASAKI , Kenta MOTOYOSHI , Shohei FUJIKURA , Hiroko IKEDA , Koji KAWAMURA
Abstract: A rotating electric machine includes a stator and a rotor. The rotor includes a rotor core and a plurality of permanent magnets. The rotor core includes a plurality of core portions. The rotor core includes an annular portion and a plurality of coupling portions. Each of the plurality of coupling portions couples the annular portion and a first core portion of each of the plurality of core portions to each other. Each of the plurality of coupling portions has at least one coupling path. A sum of a width of a portion having the smallest width in at least one coupling path is smaller than a length of a joining boundary between the annular portion and each of the plurality of coupling portions.
-
公开(公告)号：US20230194313A1
公开(公告)日：2023-06-22
申请号：US17791993
申请日：2020-02-06
Applicant: Mitsubishi Electric Corporation
Inventor： Tatsuya MORI , Hiroko IKEDA , Toshihiro MATSUNAGA , Kenji IKEDA , Kenta KUBO
CPC classification number: G01D5/24476 , G01D5/2046
Abstract: To provide an angle detection apparatus which can reduce the error of the angle which is caused by the eccentricity, by performing the reduction processing about smallest possible number of frequency bands and the lowest possible order of frequency band. An angle detection apparatus performs a first-order component reduction processing which reduces a first-order component which is a component of one rotation period in a mechanical angle of the rotor, to each of the first system two output signals; and calculates a first angle (θ1) of the rotor, based on the first system two output signals to which the first-order component reduction processing was performed.
-
公开(公告)号：US20220363310A1
公开(公告)日：2022-11-17
申请号：US17761491
申请日：2019-11-18
Applicant: Mitsubishi Electric Corporation
Inventor： Hiroko IKEDA , Tatsuya MORI , Toshihiro MATSUNAGA , Kenji IKEDA , Kenta KUBO
Abstract: The redundant resolver includes: a resolver body having a rotor, a stator opposed to the rotor and having Ns teeth arranged in a circumferential direction, and an excitation winding and two phases of output windings wound on the stator; an excitation circuit configured to supply power to the excitation winding; and an angle calculation unit configured to calculate a rotation angle on the basis of signals from the two phases of output windings. The stator is divided in the circumferential direction into M pieces which serve as M tooth blocks, N (M≥N) redundancy systems are formed on the basis of the M tooth blocks. The excitation circuit and the angle calculation unit are provided to each system so as be independent among the systems. Gap magnetic flux densities at both end portions of each tooth block are set to change mildly.
-
公开(公告)号：US20240235294A9
公开(公告)日：2024-07-11
申请号：US18277317
申请日：2021-02-26
Applicant: Mitsubishi Electric Corporation
Inventor： Hidenori SASAKI , Kenta MOTOYOSHI , Yu HIROTANI , Hiroko IKEDA , Shohei FUJIKURA
IPC: H02K1/278
CPC classification number: H02K1/278 , H02K2213/03
Abstract: A rotating electrical machine includes a stator and a rotor, the rotor includes a rotor core and a plurality of magnetic poles, the plurality of magnetic poles includes a plurality of magnet poles formed by permanent magnets, and a plurality of dummy poles, the magnet poles and the dummy poles are alternately disposed in both an axial direction and a circumferential direction, non-magnetic holes are provided between the magnet poles and the dummy poles that are adjacent in the axial direction, and when a length of each magnet pole in the axial direction is tm, a length of each dummy pole in the axial direction is tc, a length of each non-magnetic hole in the axial direction is ta, and a length of the rotor core in the axial direction is lc, the rotating electrical machine satisfies tm>tc and lc
-
-
-
-
-
-
-
-
-
Search Results
29
records
(took 0.02 seconds)
