# US 2010/0164664 A1 · Field element > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2010/0164664 A1 - Document ID: US20100164664A1 - Status: Published application - Kind: A1 - Application number: 12/595,172 - Filed: 2008-04-08 - Published: 2010-07-01 - Earliest claimed: 2007-04-18 - Assignees: Daikin Industries, Ltd. - Inventors: Keiji Aota; Yoshinari Asano - Web page: https://patentgrep.com/patent/US20100164664A1 ## CPC - H02K 1/2795: the rotor consisting of two or more circumferentially positioned magnets - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract Permanent magnets are in contact with first magnetic plates in a direction parallel to a rotation axis. The first magnetic plate includes first and second magnetic members and first and second non-magnetic members. The first magnetic member includes a pole center and is in contact with one of the permanent magnets. The first magnetic member, the first non-magnetic member, the second magnetic member and the second non-magnetic member are disposed in the stated order in a circumferential direction with the pole center and the rotation axis being as a starting point and a center, respectively. When Pn represents the number of pole pairs and i represents an odd number equal to or more than three, an angle θ1 defined by an end portion of the second non-magnetic member on the pole center side with respect to a pole gap is 0<θ 1<180/(i·Pn). An angle θ2 defined by an end portion of the first non-magnetic member on the pole center side with respect to the pole gap is 180/(i·Pn)=θ2=180·2/(i·Pn). ## Claims ### Claim 1 A field element comprising: a plurality of permanent magnets circularly disposed about a predetermined axis; a first magnetic member being in contact with a magnetic pole surface of one of said permanent magnets in a first direction parallel to said axis; a first non-magnetic member which is adjacent to said first magnetic member in a second direction being a circumferential direction with said axis being as a center and overlaps a part of said one of said permanent magnet in said first direction; a second magnetic member being adjacent to said first non-magnetic member on a side opposite to said first magnetic member in said second direction; and a second non-magnetic member being adjacent to said second magnetic member on a side opposite to said first non-magnetic member in said second direction, wherein when Pn represents the number of pairs of magnetic poles provided by said permanent magnets about said axis and i represents an integer equal to or more than three, a first angle θ1 defined by a boundary between said second magnetic member and said second non-magnetic member in said second direction with respect to a reference axis which passes through a midpoint between another one of said permanent magnets being adjacent to said one of said permanent magnets on said second non-magnetic member side and said one of said permanent magnets and which is parallel to a radial direction with said axis being as the center, and a second angle θ2 defined by a boundary between said first magnetic member and said first non-magnetic member in said second direction with respect to said reference axis with said axis being as the center satisfying: 0<θ1<180/(i·Pn); and (i·Pn)≦θ2≦180·2/(i·Pn). ### Claim 2 (depends on 1) The field element according to claim 1, wherein a part of said first magnetic member is arranged between said one of said permanent magnet and said first non-magnetic member. ### Claim 3 (depends on 1) The field element according to claim 1, further comprising third magnetic members which are positioned between said one of said permanent magnets and said another one of said permanent magnets being adjacent to said one of said permanent magnets and extend in said first direction. ### Claim 4 (depends on 1) The field element according to claim 1, further comprising a fourth magnetic member coupling said first magnetic member and said second magnetic member on at least one end side of said first non-magnetic member which is opposite to said axis in a third direction being a radial direction with said axis being as the center. ### Claim 5 (depends on 4) The field element according to claim 4, wherein said fourth magnetic member extends in said second direction beyond said second non-magnetic member in said third direction. ### Claim 6 (depends on 1) The field element according to claim 1, wherein: said first angle θ1 satisfies θ1=90/(i·Pn); and said second angle θ2 satisfies θ2=180/(i·Pn). ### Claim 7 (depends on 1) The field element according to claim 1, wherein i is 5 or 7. ### Claim 8 (depends on 1) The field element according to claim 1, wherein: said first non-magnetic member includes: a first non-magnetic member part; and a second non-magnetic member part which is adjacent to said first non-magnetic member part on said first magnetic member side in said second direction and has a length in a direction being parallel to said first direction or said third direction, the length being different from that of said first non-magnetic member part; said second non-magnetic member includes: a third non-magnetic member part; and a fourth non-magnetic member part which is adjacent to said third non-magnetic member part on said first magnetic member side in said second direction and has a length in a direction being parallel to said first direction or said third direction, the length being different from that of said first non-magnetic member part; and when j represents an integer equal to or more than three and j is a value different from i, a third angle θ3 defined by a boundary between said third non-magnetic member part and said fourth non-magnetic member part in said second direction with respect to said reference axis with said axis being as the center and a fourth angle θ4 defined by a boundary between said first non-magnetic member part and said second non-magnetic member part in said second direction with respect to said reference axis with said axis being as the center satisfy: 0<θ3<180/(j·Pn); 180/(j·Pn)≦θ4≦180·2/(j·Pn); and θ3<θ1<θ4<θ2. ### Claim 9 (depends on 8) The field element according to claim 8, wherein: said third angle θ3 satisfies θ3=90/(j·Pn); and said fourth angle θ4 satisfies θ4=180/(j·Pn). ### Claim 10 (depends on 8) The field element according to claim 8, wherein j is 5 or 7. ### Claim 11 (depends on 1) The field element according to claim 1, further comprising: a fifth magnetic member being adjacent to said one of said permanent magnet on a side opposite to said first magnetic member in said first direction; a third non-magnetic member which is adjacent to said fifth magnetic member in said second direction and overlaps a part of said one of said permanent magnet in said first direction; a sixth magnetic member being adjacent to said third non-magnetic member on a side opposite to said fifth magnetic member in said second direction; and a fourth non-magnetic member being adjacent to said sixth magnetic member on a side opposite to said third non-magnetic member in said second direction, wherein when K represents an integer equal to or more than three, a fifth angle φ1 defined by a boundary between said sixth magnetic member and said fourth non-magnetic member in said second direction with respect to said reference axis with said axis being as the center and a sixth angle φ2 defined by a boundary between said fifth magnetic member and said third non-magnetic member in said second direction with respect to said reference axis with said axis being as the center satisfy: 0<φ1<180/(K·Pn); and (K·Pn)≦φ2≦180·2/(K·Pn). ### Claim 12 (depends on 11) The field element according to claim 11, wherein a part of said fifth magnetic member is arranged between said one of said permanent magnet and said third non-magnetic member. ### Claim 13 (depends on 11) The field element according to claim 11, further comprising a seventh magnetic member coupling said fifth magnetic member and said sixth magnetic member on at least one end side of said third non-magnetic member which is opposite to said axis in said third direction. ### Claim 14 (depends on 13) The field element according to claim 13, wherein said seventh magnetic member extends in said second direction beyond said fourth non-magnetic member in said third direction. ### Claim 15 (depends on 11) The field element according to claim 11, wherein: said fifth angle φ1 satisfies φ1=90/(K·Pn); and said sixth angle φ2 satisfies φ2=180/(K·Pn). ### Claim 16 (depends on 11) The field element according to claim 11, wherein K is 5 or 7. ### Claim 17 (depends on 11) The field element according to claim 11, wherein: said third non-magnetic member includes: a fifth non-magnetic member part; and a sixth non-magnetic member part which is adjacent to said fifth non-magnetic member part on said fifth magnetic member side in said second direction and has a length in a direction being parallel to said first direction or said third direction: the length being different from that of said fifth non-magnetic member part; said fourth non-magnetic member includes: a seventh non-magnetic member part; and an eighth non-magnetic member part which is adjacent to said seventh non-magnetic member part on said fifth magnetic member side in said second direction and has a length in a direction being parallel to said first direction or said third direction: the length being different from that of said seventh non-magnetic member part; and when L represents an integer equal to or more than three and L is a value different from K, a seventh angle φ3 defined by a boundary between said seventh non-magnetic member part and said eighth non-magnetic member part in said second direction with respect to said reference axis with said axis being as the center and an eighth angle φ4 defined by a boundary between said fifth non-magnetic member part and said sixth non-magnetic member part in said second direction with respect to said reference axis with said axis being as the center satisfy: 0<φ3<180/(L·Pn); 180/(L·Pn)≦φ4≦180·2/(L·Pn); and φ3<φ1<φ4<φ2. ### Claim 18 (depends on 17) The field element according to claim 17, wherein: said seventh angle φ3 satisfies φ3=90/(L·Pn); and said eighth angle φ4 satisfies φ4=180/(L·Pn). ### Claim 19 (depends on 17) The field element according to claim 17, wherein L is 5 or 7. ### Claim 20 (depends on 1) The field element according to claim 1, wherein said first magnetic member and said second magnetic member are formed of a dust core.