Patents by Inventor Yasuji Echizen
Yasuji Echizen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9438075Abstract: A motor stator of the invention is provided with a laminated stator core comprising a plurality of core pieces having teeth and linked by intermediate thin-wall portions. The thin-wall portions are bent to form the stator core into an annular shape with two ends of the stator core joined by welding, and slots are formed between adjoining pairs of the teeth. A welded portion of the stator core is not near a center line in a radial direction of any of the slots.Type: GrantFiled: February 2, 2012Date of Patent: September 6, 2016Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Hu Li, Yuichi Yoshikawa, Yukihiro Okada, Minoru Chamura, Tooru Nakamaru, Yasuji Echizen
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Patent number: 9385565Abstract: In a core material according to the present invention, a predetermined number of core pieces, each having a tooth portion and a yoke portion, are connected to each other via connecting portions. Each of the connecting portions includes: a V-shaped notch portion; a through hole that is formed at a tapered portion of the notch portion with a diameter elongated in a connection direction; and a thin portion that is formed outside of the through hole and connects the core pieces to each other. The width of the thin portion is more increased apart from the axis of symmetry of two sides constituting the V shape of the notch portion, and further, an intersection between extension lines of the two sides constituting the V shape lies within 0.3 W from the inner side of the thin portion in a notch direction and within the thin portion when W designates the width of the thin portion along the axis of symmetry.Type: GrantFiled: December 5, 2011Date of Patent: July 5, 2016Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Yukihiro Okada, Minoru Chamura, Yasuji Echizen, Tooru Nakamaru, Hu Li
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Patent number: 8664962Abstract: The N1(s) turns of a first output winding is divided by a split ratio ? into N1a(s) turns of a lower-layer first output winding and N1b(s) of an upper-layer first output winding. The lower-layer first output winding is continuously wound around all slots as the undermost layer. A second output winding is continuously wound around all slots over the lower-layer first output winding. An upper-layer first output winding is continuously wound around all slots over the second output winding. The split ratio ? is adjusted only in the slots where the detection accuracy decreases. This equalize the contribution of the first output windings and the second output winding to the flux linkage, thereby achieving high angle detection accuracy.Type: GrantFiled: January 10, 2012Date of Patent: March 4, 2014Assignee: Panasonic CorporationInventors: Takashi Ogawa, Yuichi Yoshikawa, Yasuji Echizen, Masahiko Kobayashi, Masaaki Nishiyama
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Publication number: 20140009031Abstract: A motor stator of the invention is provided with a laminated stator core comprising a plurality of core pieces having teeth and linked by intermediate thin-wall portions. The thin-wall portions are bent to form the stator core into an annular shape with two ends of the stator core joined by welding, and slots are formed between adjoining pairs of the teeth. A welded portion of the stator core is not near a center line in a radial direction of any of the slots.Type: ApplicationFiled: February 2, 2012Publication date: January 9, 2014Applicant: PANASONIC CORPORATIONInventors: Hu Li, Yuichi Yoshikawa, Yukihiro Okada, Minoru Chamura, Tooru Nakamaru, Yasuji Echizen
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Patent number: 8604804Abstract: The N1(s) turns of an output winding is divided by a split ratio ? into N1a(s) turns of an output winding (1a) and N1b(s) turns of an output winding (1b). The output winding (1a) is continuously wound around all slots as the undermost layer. Output winding 2, which is different in phase by 90 degrees from the output winding (1a), is continuously wound around all the slots over the output winding (1a). An output winding (1b) is continuously wound around all the slots over output winding 2. This equalizes the contribution of the output winding and output winding 2 to the flux linkage, thereby achieving high angle detection accuracy.Type: GrantFiled: April 12, 2011Date of Patent: December 10, 2013Assignee: Panasonic CorporationInventors: Takashi Ogawa, Yuichi Yoshikawa, Yasuji Echizen, Masahiko Kobayashi, Masaaki Nishiyama
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Publication number: 20130293058Abstract: In a core material according to the present invention, a predetermined number of core pieces, each having a tooth portion and a yoke portion, are connected to each other via connecting portions. Each of the connecting portions includes: a V-shaped notch portion; a through hole that is formed at a tapered portion of the notch portion with a diameter elongated in a connection direction; and a thin portion that is formed outside of the through hole and connects the core pieces to each other. The width of the thin portion is more increased apart from the axis of symmetry of two sides constituting the V shape of the notch portion, and further, an intersection between extension lines of the two sides constituting the V shape lies within 0.3 W from the inner side of the thin portion in a notch direction and within the thin portion when W designates the width of the thin portion along the axis of symmetry.Type: ApplicationFiled: December 5, 2011Publication date: November 7, 2013Applicant: PANASONIC CORPORATIONInventors: Yukihiro Okada, Minoru Chamura, Yasuji Echizen, Tooru Nakamaru, Hu Li
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Publication number: 20130088127Abstract: The N1(s) turns of an output winding is divided by a split ratio ? into N1a(s) turns of an output winding (1a) and N1b(s) turns of an output winding (1b). The output winding (1a) is continuously wound around all slots as the undermost layer. Output winding 2, which is different in phase by 90 degrees from the output winding (1a), is continuously wound around all the slots over the output winding (1a). An output winding (1b) is continuously wound around all the slots over output winding 2. This equalizes the contribution of the output winding and output winding 2 to the flux linkage, thereby achieving high angle detection accuracy.Type: ApplicationFiled: April 12, 2011Publication date: April 11, 2013Applicant: PANASONIC CORPORATIONInventors: Takashi Ogawa, Yuichi Yoshikawa, Yasuji Echizen, Masahiko Kobayashi, Masaaki Nishiyama
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Publication number: 20130043864Abstract: The N1(s) turns of a first output winding is divided by a split ratio ? into N1a(s) turns of a lower-layer first output winding and N1b(s) of an upper-layer first output winding. The lower-layer first output winding is continuously wound around all slots as the undermost layer. A second output winding is continuously wound around all slots over the lower-layer first output winding. An upper-layer first output winding is continuously wound around all slots over the second output winding. The split ratio ? is adjusted only in the slots where the detection accuracy decreases. This equalize the contribution of the first output windings and the second output winding to the flux linkage, thereby achieving high angle detection accuracy.Type: ApplicationFiled: January 10, 2012Publication date: February 21, 2013Applicant: PANASONIC CORPORATIONInventors: Takashi Ogawa, Yuichi Yoshikawa, Yasuji Echizen, Masahiko Kobayashi, Masaaki Nishiyama
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Patent number: 8362670Abstract: A plurality of stator teeth 2 are arranged at a constant interval in a circumferential direction on the inner circumferential face side or the outer circumferential face side of a ring-shaped stator core 1 that is made of a plurality of steel plates. The winding wire 5 is wound about the stator teeth. An insulator 4 that electrically insulates the stator core and the winding wire is provided therebetween. A gap 6 is formed between the winding wire and the insulator. Accordingly, a desired distance can be secured between the stator teeth and the winding wire regardless of the thickness of the insulator, and, thus, the influence of leakage magnetic fluxes that acts on the winding wire can be reduced. Accordingly, the influence of leakage magnetic fluxes formed near the stator teeth that acts on the winding wire can be reduced regardless of the thickness of the insulator.Type: GrantFiled: July 1, 2010Date of Patent: January 29, 2013Assignee: Panasonic CorporationInventors: Takashi Ogawa, Yuichi Yoshikawa, Yasuo Yonei, Yasuji Echizen, Masahiko Kobayashi
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Publication number: 20110018382Abstract: A plurality of stator teeth 2 are arranged at a constant interval in a circumferential direction on the inner circumferential face side or the outer circumferential face side of a ring-shaped stator core 1 that is made of a plurality of steel plates. The winding wire 5 is wound about the stator teeth. An insulator 4 that electrically insulates the stator core and the winding wire is provided therebetween. A gap 6 is formed between the winding wire and the insulator. Accordingly, a desired distance can be secured between the stator teeth and the winding wire regardless of the thickness of the insulator, and, thus, the influence of leakage magnetic fluxes that acts on the winding wire can be reduced. Accordingly, the influence of leakage magnetic fluxes formed near the stator teeth that acts on the winding wire can be reduced regardless of the thickness of the insulator.Type: ApplicationFiled: July 1, 2010Publication date: January 27, 2011Applicant: PANASONIC CORPORATIONInventors: Takashi OGAWA, Yuichi YOSHIKAWA, Yasuo YONEI, Yasuji ECHIZEN, Masahiko KOBAYASHI
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Patent number: 6302798Abstract: A torque transmitter includes (a) a driver, (b) torque transmitting means for transmitting the torque generated by the driver to a follower, (c) a rotary body on the follower side, and (d) a torque reducer that reduces (or discontinues) the torque transmission when excessive torque over a threshold torque value is loaded to the rotary body on the follower side, and the torque limiter has different threshold-torque-values responsive to rotating directions of the rotary body.Type: GrantFiled: July 23, 1999Date of Patent: October 16, 2001Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Keita Nakaguro, Satoru Watanabe, Yukio Chihara, Mizuo Komine, Yasuji Echizen, Shoichi Kubo