公开(公告)号：EP1133045A4

公开(公告)日：2002-02-13

申请号：EP98954781

申请日：1998-11-20

申请人： HITACHI LTD ,  HITACHI ENG SERVICE

发明人： IDE KAZUMASA ,  TAKAHASHI MIYOSHI ,  NEMOTO MAMORU ,  TAKAHASHI SEIJI

IPC分类号： H02K16/02 ,  H02K17/16 ,  H02K17/42

CPC分类号： H02K17/16 ,  H02K16/02 ,  H02K17/42

摘要： A wound-rotor induction motor comprises a wound stator, a wound rotor secured to the rotary shaft on the rotational center side of the wound stator, and a squirrel cage rotor provided on the rotational center side of the wound rotor. An energy conversion facility for a variable speed electric machine having a wound-rotor induction machine regenerates AC power in an AC system connected with the primary and secondary windings through a rectifier, a chopper circuit, a capacitor and an inverter. Even if the current flowing through the secondary winding contains harmonics, an induction current flows through the conductor of the squirrel cage rotor to cancel the rotating field generated in the wound-rotor by the harmonics, and hence the harmonics in the current flowing through the secondary winding is attenuated. The harmonic power is restrained from flowing out to the outside of the facility, and high quality power of which the distortion of the output voltage is suppressed can be generated.

公开(公告)号：EP2711944A4

公开(公告)日：2015-01-07

申请号：EP11865595

申请日：2011-05-16

申请人： HITACHI LTD

发明人： KURITA NAOYUKI ,  IDE KAZUMASA ,  KATOH SHUJI

IPC分类号： H01F37/00 ,  H01F3/04 ,  H01F27/24 ,  H01F27/245 ,  H01F27/34 ,  H02M3/24

CPC分类号： H01F3/04 ,  H01F27/245 ,  H01F37/00 ,  H01F2027/348 ,  H02M3/24

公开(公告)号：EP1220424A4

公开(公告)日：2002-11-27

申请号：EP99940649

申请日：1999-09-03

申请人： HITACHI LTD

发明人： IDE KAZUMASA ,  HATTORI KENICHI ,  KOMURA AKIYOSHI ,  YAMASHINA MITSUNORI ,  SONOBE TADASHI ,  SENBA AKITOMI ,  SATO JUNJI ,  SHIOBARA RYOICHI

IPC分类号： H02K9/04 ,  H02K9/06 ,  H02K9/08 ,  H02K9/18 ,  H02K9/10

CPC分类号： H02K9/12

摘要： A dynamo-electric machine which can make uniform an axial temperature rise distribution in the machine by supplying a cooled coolant to the axial center, which is remotest from the axial opposite ends of a core, of the core, and which comprises a plurality of circumferentially continuous air passages (18) disposed between a stator frame (1) and a stator core (2) and coolers (28) disposed correspondingly to the air passages (18), wherein a coolant increased in pressure by a pressure increasing device is cooled by the coolers (28) and allowed to flow to the axial center of the stator core (2) via air passages (15) communicating with the axial center of the stator core (2) in a direction from the outer circumferential side toward the inner circumferential side of the stator core (2).

公开(公告)号：EP2775488A4

公开(公告)日：2015-07-08

申请号：EP11875137

申请日：2011-10-31

申请人： HITACHI LTD

发明人： KURITA NAOYUKI ,  IDE KAZUMASA

IPC分类号： H01F37/00 ,  H01F3/04 ,  H01F3/10 ,  H01F3/14 ,  H01F27/24 ,  H01F27/25 ,  H01F27/26 ,  H01F30/00 ,  H01F30/12

CPC分类号： H01F3/04 ,  H01F3/14 ,  H01F27/263 ,  H01F30/12 ,  H01F37/00 ,  H01F2003/106

公开(公告)号：EP1367697A4

公开(公告)日：2005-10-05

申请号：EP02705070

申请日：2002-03-04

申请人： HITACHI LTD

发明人： HATTORI KENICHI ,  IDE KAZUMASA ,  KOMURA AKIYOSHI ,  WATANABE TAKASHI ,  SHIOBARA RYOICHI ,  YAGI YASUOMI ,  IWASHIGE KENGO ,  KOBASHI KEIJI

IPC分类号： H02K1/20 ,  H02K1/32 ,  H02K3/24 ,  H02K9/18 ,  H02K9/08

CPC分类号： H02K9/18 ,  H02K1/20 ,  H02K1/32 ,  H02K3/24

摘要： A dynamo-electric machine capable of reducing the temperature of a rotor located therein, wherein at least one closed ventilating loop is formed for cooling the rotor, and one of the loops forms a ventilating passage ranging from the exhaust side of a fan installed at one end of a rotating shaft to a cooler through a heat source at the end of a generator to lead the cool air passed through the cooler to the rotor.