Patent
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Poly-phase reluctance electric motor with transverse magnetic flux

التفاصيل البيبلوغرافية
العنوان: Poly-phase reluctance electric motor with transverse magnetic flux
Patent Number: 9,362,786
تاريخ النشر: June 07, 2016
Appl. No: 14/129380
Application Filed: July 25, 2012
مستخلص: A multi-phase reluctance electric motor with transverse magnetic flux which includes a stator and a rotor. The stator comprises a housing (1) and a number m of phase armature units, each being staggered at an electrical angle of 360°/m along the circumferential direction sequentially in the housing (1) along the axial direction and comprises an armature iron core, an armature coil (2) and permanent magnets (3). The armature coil (2) is embedded within an annular space formed among first, second and third annular iron core segments (6, 7, 8) of the armature iron core. The pole distance τm between two adjacent permanent magnets (3) on the same segment and the tooth distance τp between the rotor teeth (5) along the circumferential direction fulfil 2 τm=τp. This motor eliminates mutual inductance between phases, improving control precision of current and electromagnetic torque and dynamic characteristics of the system.
Inventors: Kou, Baoquan (Harbin, CN); Xie, Dagang (Harbin, CN); Wu, Taijian (Harbin, CN); Zhou, Yiheng (Harbin, CN)
Assignees: Harbin Institute of Technology (Harbin, Heilongjiang Province, CN)
Claim: 1. A multi-phase reluctance electric motor with transverse magnetic flux, characterized in that: said electric motor comprises a stator (10) and a rotor (20); wherein a gas partition channel (30) is defined between said stator (10) and said rotor (20); wherein said rotor (20) comprises a rotor frame unit (4) and a plurality of rotor teeth (5); wherein said plurality of rotor teeth (5) are uniformly distributed along said outer circumferential portion of said rotor frame unit (4); wherein said rotor frame unit (4) and said rotor teeth (5) have an integrated structure; wherein said stator (10) comprises a housing (1) and an armature unit with m number of phases defining m number of single-phase armature members, where m is said number of phases of said electric motor and m is equal to or greater than 3; wherein said housing (1) has a cylindrical structure; wherein said m number of armature members of said armature unit are sequentially arranged along an axial direction inside said housing, and said single-phase armature members are sequentially staggered along an circumferential direction at an electrical angle of 360°/m; wherein each of said single-phase armature member comprises an armature iron core, an armature coil (2) and 2n number of permanent magnets (3); wherein n is a positive integer; wherein said armature iron core comprises a first iron core segment (6), a second iron core segment (7) and a third iron core segment (8) in which all of said first, second and third iron core segments have a ring-shaped structure defining an axial direction, a central axis along said axial direction, an outer diameter and an inner diameter respectively, wherein said outer diameter of each of said first, said second and said third iron core segments is the same; wherein said first, said second and said third iron core segments are sequentially and tightly arranged along said axial direction inside said housing (1), and said central axis of said first, said second and said third iron core segments is the same; wherein said second iron core segment (7) is positioned between said first iron core segment (6) and said third iron core segment (8) and said inner diameter of said second iron core segment (7) is greater than that of said first iron core segment (6) and said inner diameter of said third iron core segment (8); wherein said inner diameter of said first iron core segment (6) and said inner diameter of said third iron core segment (8) are the same; wherein said armature coil (2) has an annular coil structure and said armature coil (2) is embedded within an annular space formed between said first iron core segment, said second iron core segment and said third iron core segments; wherein said 2n number of permanent magnets (3) utilizes permanent magnets having a tile-shaped structure which is radially magnetized or magnetized in parallel; wherein said 2n number of permanent magnets (3) are divided equally into 2 groups to define a first permanent magnet group and a second permanent magnet group; wherein said permanent magnets of said first permanent magnet group are sequentially and alternately aligned according to a N-pole and a S-pole of each of said permanent magnets along a circumferential direction at an inner surface of said first segment (6); wherein said permanent magnets (3) of said second permanent magnet group are sequentially and alternately aligned according to a S-pole and a N-pole of each of said permanent magnet (3) along a circumferential direction at an inner surface of said third segment (8); wherein said permanent magnets (3) in said first segment (6) and said permanent magnets in said third segment (8) are arranged in opposite polarities and symmetrically along said axis of symmetry of said cross-section of said second segment (7); wherein a polar distance τ m is defined as a distance between each two adjacently positioned permanent magnets in said same iron core segment in which said permanent magnets are aligned along said circumferential direction of said corresponding iron core segment, where a pitch τ p of said rotor teeth (5) is defined as a distance between two tooth which are aligned along said circumferential direction, and a relation between said polar distance and said pitch fulfills the equation 2 τ m =τ p .
Claim: 2. The multi-phase reluctance electric motor with transverse magnetic flux according to claim 1 , characterized in that, wherein said rotor teeth (5) have a high magnetic permeability.
Claim: 3. The multi-phase reluctance electric motor with transverse magnetic flux according to claim 1 , characterized in that, wherein said first iron core segment (6), said second iron core segment (7) and said third iron core segment (8) are integral in structure or non-integral in structure.
Claim: 4. A multi-phase reluctance electric motor with transverse magnetic flux, characterized in that: said electric motor comprises a stator (10) and a rotor (20); wherein a gas partition channel (30) is defined between said stator (10) and said rotor (20); wherein said rotor (20) comprises a rotor frame unit (4) and a plurality of rotor teeth (5); wherein said plurality of rotor teeth (5) are uniformly distributed along said outer circumferential portion of said rotor frame unit (4); wherein said rotor frame unit (4) and said rotor teeth (5) have an integrated structure; wherein said stator (10) comprises a housing (1) and an armature unit with m number of phases defining m number of single-phase armature members, where m is said number of phases of said electric motor and m is equal to or greater than 3; wherein said housing (1) has a cylindrical structure; wherein said m number of armature members of said armature unit are sequentially arranged along an axial direction inside said housing, and said single-phase armature members are sequentially staggered along an circumferential direction at an electrical angle of 360°/m; wherein each of said single-phase armature member comprises an armature iron core, an armature coil (2) and 2n number of permanent magnets (3); wherein n is a positive integer; wherein said armature iron core comprises a first iron core segment (6), a second iron core segment (7) and a third iron core segment (8) in which all of said first, second and third iron core segments have a ring-shaped structure defining an axial direction, a central axis along said axial direction, an outer diameter and an inner diameter respectively, wherein said outer diameter of each of said first, said second and said third iron core segments is the same; wherein said first, said second and said third iron core segments are sequentially and tightly arranged along said axial direction inside said housing (1), and said central axis of said first, said second and said third iron core segments is the same; wherein said second iron core segment (7) is positioned between said first iron core segment (6) and said third iron core segment (8) and said inner diameter of said second iron core segment (7) is greater than that of said first iron core segment (6) and said inner diameter of said third iron core segment (8); wherein said inner diameter of said first iron core segment (6) and said inner diameter of said third iron core segment (8) are the same; wherein said armature coil (2) has an annular coil structure and said armature coil (2) is embedded within an annular space formed between said first iron core segment, said second iron core segment and said third iron core segments; wherein a plurality of axial slots for permanent magnet are uniformly provided along said circumferential direction at an inner circumferential surface of said first iron core segment (6) and at an inner circumferential surface of said third iron core segment (8) respectively; wherein a number of said axial slots in said first iron core segment (6) is said same as a number of said axial slots in said third iron core segment (8); wherein said 2n number of permanent magnets (3) utilizes permanent magnet having a tile-shaped structure which is radially magnetized or magnetized in parallel; wherein said 2n number of permanent magnets (3) are divided equally into 2 groups to define a first permanent magnet group and a second permanent magnet group; wherein each of said permanent magnets of said first permanent magnet group are secured into position at one of said axial slot of said first iron core segment (6); wherein each of said permanent magnets of said second permanent magnet group are secured into position at one of said axial slots of said third iron core segment (8); wherein a magnetization direction of each of said permanent magnets which is positioned in said first iron core segment (6) is the same, and said magnetization direction of said permanent magnets in said first iron core segment (6) is pointing to or away from said center; wherein a magnetization direction of each of said plurality of permanent magnets in said third iron core segment (8) is the same, and said magnetization direction of said permanent magnets in said third iron core segment (8) is pointing to or away from said center; wherein said permanent magnets in said first iron core segment (6) and said permanent magnets in said third iron core segment (8) are arranged in opposite polarities and symmetrically along said axis of symmetry of said cross-section of said second iron core segment (7); wherein a polar distance τ m is defined as a distance between each two adjacently positioned permanent magnets in said same iron core segment in which said permanent magnets are aligned along said circumferential direction of said corresponding iron core segment, where a pitch τ p of said rotor teeth (5) is defined as a distance between two tooth which are aligned along said circumferential direction, and a relation between said polar distance and said pitch fulfills the equation τ m =τ p .
Claim: 5. The multi-phase reluctance electric motor with transverse magnetic flux according to claim 4 , characterized in that, wherein said rotor teeth (5) have a high magnetic permeability.
Claim: 6. The multi-phase reluctance electric motor with transverse magnetic flux according to claim 4 , characterized in that, wherein said first iron core segment (6), said second iron core segment (7) and said third iron core segment (8) are integral in structure or non-integral in structure.
Claim: 7. A multi-phase reluctance electric motor with transverse magnetic flux, characterized in that: said electric motor comprises a stator (10) and a rotor (20); wherein a gas partition channel (30) is defined between said stator (10) and said rotor (20); wherein said rotor (20) comprises a rotor frame unit (4) and a plurality of rotor teeth (5); wherein said plurality of rotor teeth (5) are uniformly distributed along said outer circumferential portion of said rotor frame unit (4); wherein said rotor frame unit (4) and said rotor teeth (5) have an integrated structure; wherein said stator (10) comprises a housing (1) and an armature unit with m number of phases defining m number of single-phase armature members, where m is said number of phases of said electric motor and m is equal to or greater than 3; wherein said housing (1) has a cylindrical structure; wherein said m number of armature members of said armature unit are sequentially arranged along an axial direction inside said housing, and said single-phase armature members are sequentially staggered along an circumferential direction at an electrical angle of 360°/m; wherein each of said single-phase armature member comprises an armature iron core, an armature coil (2) and 2n number of permanent magnets (3); wherein n is a positive integer; wherein said armature iron core comprises a first iron core segment (6), a second iron core segment (7) and a third iron core segment (8) in which all of said first, second and third iron core segments have a ring-shaped structure defining an axial direction, a central axis along said axial direction, an outer diameter and an inner diameter respectively, wherein said outer diameter of each of said first, said second and said third iron core segments is the same; wherein said first, said second and said third iron core segments are sequentially and tightly arranged along said axial direction inside said housing (1), and said central axis of said first, said second and said third iron core segments is the same; wherein said second iron core segment (7) is positioned between said first iron core segment (6) and said third iron core segment (8) and said inner diameter of said second iron core segment (7) is greater than that of said first iron core segment (6) and said inner diameter of said third iron core segment (8); wherein said inner diameter of said first iron core segment (6) and said inner diameter of said third iron core segment (8) are the same; wherein said armature coil (2) has an annular coil structure and said armature coil (2) is embedded within an annular space formed between said first iron core segment, said second iron core segment and said third iron core segments; wherein a plurality of axial slots for permanent magnet are uniformly provided along said circumferential direction at an inner circumferential surface of said first iron core segment (6) and at an inner circumferential surface of said third iron core segment (8) respectively; wherein a number of said axial slots in said first iron core segment (6) is the same as a number of said axial slots in said third iron core segment (8); wherein a rotation difference of positions between said axial slots of said first iron core segment (6) and said axial slots of said third iron core segment (8) along said circumferential direction is equal to half of a pitch τ p /2, where a pitch τ p of said rotor teeth (5) is defined as a distance between two tooth which are aligned along said circumferential direction; wherein said 2n number of permanent magnets (3) utilizes permanent magnet having a tile-shaped structure which is radially magnetized or magnetized in parallel; wherein said 2n number of permanent magnets (3) are divided equally into 2 groups to define a first permanent magnet group and a second permanent magnet group; wherein each of said permanent magnets of said first permanent magnet group are secured into position at one of said axial slot of said first iron core segment (6); wherein each of said permanent magnets of said second permanent magnet group are secured into position at one of said axial slots of said third iron core segment (8); wherein a magnetization direction of each of said permanent magnets which are positioned in said first iron core segment (6) are the same, and said magnetization direction of said permanent magnets in said first iron core segment (6) is pointing to or away from said center; wherein a magnetization direction of each of said plurality of permanent magnets in said third iron core segment (8) are the same, and said magnetization direction of said permanent magnets in said third iron core segment (8) is pointing to or away from said center; wherein said permanent magnets in said first iron core segment (6) and said permanent magnets in said third iron core segment (8) are arranged in the same polarities; wherein a polar distance τ m is defined as a distance between each two adjacently positioned permanent magnets in said same iron core segment in which said permanent magnets are aligned along said circumferential direction of said corresponding iron core segment, and a relation between said polar distance and said pitch fulfills the equation τ m =τ p .
Claim: 8. The multi-phase reluctance electric motor with transverse magnetic flux according to claim 7 , characterized in that, wherein said rotor teeth (5) have a high magnetic permeability.
Claim: 9. The multi-phase reluctance electric motor with transverse magnetic flux according to claim 7 , characterized in that, wherein said first iron core segment (6), said second iron core segment (7) and said third iron core segment (8) are integral in structure or non-integral in structure.
Claim: 10. A multi-phase reluctance electric motor with transverse magnetic flux, characterized in that: said electric motor comprises a stator (10) and a rotor (20); wherein a gas partition channel (30) is defined between said stator (10) and said rotor (20); wherein said rotor (20) comprises a rotor frame unit (4) and a plurality of rotor teeth (5); wherein said plurality of rotor teeth (5) are uniformly distributed along said outer circumferential portion of said rotor frame unit (4); wherein said rotor frame unit (4) and said rotor teeth (5) have an integrated structure; wherein said stator (10) comprises a housing (1) and an armature unit with m number of phases defining m number of single-phase armature members, where m is said number of phases of said electric motor and m is equal to or greater than 3; wherein said housing (1) has a cylindrical structure; wherein said m number of armature members of said armature unit are sequentially arranged along an axial direction inside said housing, and said single-phase armature members are sequentially staggered along an circumferential direction at an electrical angle of 360°/m; wherein each of said single-phase armature member comprises an armature iron core, an armature coil (2) and 2n number of permanent magnets (3); wherein n is a positive integer; wherein each of said armature iron cores comprises n number of iron core poles and each one of said iron core poles comprises one first iron core segment (6), one second iron core segment (7) and one third iron core segment (8) fittingly arranged together, while n number of axial slots are uniformly provided along said circumferential direction at an inner surface of said housing (1) and each of said axial slots has a bottom portion having an arc-shaped structure and two side panels which are parallel to each other; wherein said number of axial slots is the same as said number of iron core poles of said armature iron core in the same armature iron core, said n number of iron core poles of each of said armature iron core are sequentially positioned in said axial slots along said circumferential direction respectively, and each of said iron core pole are fittingly in direct contact with said bottom portion and said two side panels of said axial slot corresponding to said particular iron core pole; wherein a height of said first iron core segment (6) along a radial direction is the same as a height of said third iron core segment (8) along said radial direction, a height of said second iron core segment (7) along said radial direction is smaller than said height of said first iron core segment (6) along said radial direction, each of said iron core poles define one gas partition side panel adjacent to said gas partition channel (30) and has one winding groove provided on said gas partition side panel, and all of said winding grooves of said n number of iron core poles of said same armature iron core have the same axial position; wherein said armature coil (2) is an annular armature coil and said armature coil (2) is embedded in said winding grooves of said n number of iron core poles of said armature iron core corresponding to said same armature iron core; wherein said 2n number of permanent magnets (3) utilizes radially magnetized or magnetized in parallel tile-shaped permanent magnet; wherein said 2n number of permanent magnets (3) are positioned at an inner surface of said first iron core segment (6) and at an inner surface of said third iron core segment (8) of said n number of iron core poles respectively; wherein each of said two adjacently positioned permanent magnets (3) belonging to said same particular iron core pole are arranged in opposite polarities and each of said two adjacently positioned permanent magnets (3) along said circumferential direction are also arranged in opposite polarities; wherein a polar distance τ m is defined as a distance between said two adjacently positioned permanent magnets aligned along said circumferential direction, where a pitch τ p is defined as a distance between two tooth of said rotor teeth (5) which are aligned along said circumferential direction, and a relation between said polar distance and said pitch fulfills the equation 2 τ m =τ p .
Claim: 11. The multi-phase reluctance electric motor with transverse magnetic flux according to claim 10 , characterized in that, wherein said rotor teeth (5) have a high magnetic permeability.
Claim: 12. The multi-phase reluctance electric motor with transverse magnetic flux according to claim 10 , characterized in that, wherein said first iron core segment (6), said second iron core segment (7) and said third iron core segment (8) are integral in structure or non-integral in structure.
Claim: 13. A multi-phase reluctance electric motor with transverse magnetic flux, characterized in that: said electric motor comprises a stator (10) and a rotor (20); wherein a gas partition channel (30) is defined between said stator (10) and said rotor (20); wherein said rotor (20) comprises a rotor frame unit (4) and a plurality of rotor teeth (5); wherein said plurality of rotor teeth (5) are uniformly distributed along said outer circumferential portion of said rotor frame unit (4); wherein said rotor frame unit (4) and said rotor teeth (5) have an integrated structure; wherein said stator (10) comprises a housing (1) and an armature unit with m number of phases defining m number of single-phase armature members, where m is said number of phases of said electric motor and m is equal to or greater than 3; wherein said housing (1) has a cylindrical structure; wherein said m number of armature members of said armature unit are sequentially arranged along an axial direction inside said housing, and said single-phase armature members are sequentially staggered along an circumferential direction at an electrical angle of 360°/m; wherein each of said single-phase armature member comprises an armature iron core, an armature coil (2) and 2n number of permanent magnets (3); wherein n is an even number; wherein said armature iron core comprises a first iron core segment (6), a second iron core segment (7) and a third iron core segment (8), all of said first, said second and said third iron core segments have a ring-shaped structure, each of which defines a central axis, an outer diameter and an inner diameter respectively, said first, said second and said third iron core segments are sequentially and tightly arranged along an axial direction inside said housing (1), said central axis of said first, said second and said third iron core segments is the same, said outer diameter of said first, said second and said third segments is the same, said second iron core segment (7) is positioned between said first iron core segment (6) and said third iron core segment (8), said inner diameter of said second iron core segment (7) is greater than said inner diameter of said first iron core segment (7), and said inner diameter of said first iron core segment (6) and said inner diameter of said third iron core segment (8) are the same; wherein said armature coil (2) is an annular armature coil and said armature coil (2) is embedded within an annular space formed between said first iron core segment (6), said second iron core segment (7) and said third iron core segment (8); wherein each of said 2n number of permanent magnets (3) has a flat-shaped structure and is tangentially magnetized; wherein said 2n number of permanent magnets (3) are divided equally into 2 groups to define a first permanent magnet group and a second permanent magnet group; wherein said n number of permanent magnets (3) of said first permanent magnet group are uniformly embedded inside said first iron core segment (6) of said armature iron core along said circumferential direction and are aligned to forming a first radial alignment pattern along said radial direction; wherein said n number of permanent magnets (3) of said second permanent magnet group are uniformly embedded inside said third iron core segment (8) of said armature iron core along said circumferential direction and are aligned to forming a second radial alignment pattern along said radial direction, while each of said permanent magnets (3) are fittingly in direct contact with said housing (1); wherein a length of each of said permanent magnets (3) of said first iron core segment (6) and a length of each of said permanent magnets (3) of said third iron core segment (8) along said axial direction are the same; said first iron core segment (6) embedded with said permanent magnets (3) and said third iron core segment (8) embedded with said permanent magnets (3) have said same structural construction in which each of said two adjacently positioned permanent magnets (3) along said circumferential direction are arranged in opposite polarities and each of said two adjacently positioned permanent magnets (3) along said axial direction are arranged in opposite polarities; wherein a polar distance τ m is defined as a distance between said two adjacently positioned permanent magnets aligned along said circumferential direction, where a pitch τ p is defined as a distance between two tooth of said rotor teeth (5) which are aligned along said circumferential direction, and a relation between said polar distance and said pitch fulfills the equation 2 τ m =τ p .
Claim: 14. The multi-phase reluctance electric motor with transverse magnetic flux according to claim 13 , characterized in that, wherein a thickness of each of the permanent magnets defined along the tangential direction of a side of the housing is greater than or equal to a thickness of the permanent magnets (3) defined at the gas partition side panel along the tangential direction.
Claim: 15. The multi-phase reluctance electric motor with transverse magnetic flux according to claim 13 , characterized in that, wherein said rotor teeth (5) have a high magnetic permeability.
Claim: 16. The multi-phase reluctance electric motor with transverse magnetic flux according to claim 13 , characterized in that, wherein said first iron core segment (6), said second iron core segment (7) and said third iron core segment (8) are integral in structure or non-integral in structure.
Claim: 17. A multi-phase reluctance electric motor with transverse magnetic flux, characterized in that: said electric motor comprises a stator (10) and a rotor (20); wherein a gas partition channel (30) is defined between said stator (10) and said rotor (20); wherein said rotor (20) comprises a rotor frame unit (4) and a plurality of rotor teeth (5); wherein said plurality of rotor teeth (5) are uniformly distributed along said outer circumferential portion of said rotor frame unit (4); wherein said rotor frame unit (4) and said rotor teeth (5) have an integrated structure; wherein said stator (10) comprises a housing (1) and an armature unit with m number of phases defining m number of single-phase armature members, where m is said number of phases of said electric motor and m is equal to or greater than 3; wherein said housing (1) has a cylindrical structure; wherein said m number of armature members of said armature unit are sequentially arranged along an axial direction inside said housing, and said single-phase armature members are sequentially staggered along an circumferential direction at an electrical angle of 360°/m; wherein each of said single-phase armature member comprises an armature iron core, an armature coil (2) and a plurality number of permanent magnets (3); wherein each of said armature iron cores comprises a plurality number of iron core poles in which each one of said iron core poles comprises one first iron core segment (6), one second iron core segment (7) and one third iron core segment (8) fittingly arranged together, while a plurality number of axial slots which have said same structural construction are uniformly provided along said circumferential direction at an inner surface of said housing (1) and are aligned to form a radial pattern along said radial direction, and each of said axial slots has a bottom portion having an arc-shaped structure and two side panels extended from two sides of said bottom portion; wherein said number of axial slots is said same as said number of iron core poles of said armature iron core belonging to said same armature iron core; wherein each of said iron core poles of each one of said armature iron core is fittingly positioned in one of said axial slots, and each of said iron core poles is fittingly in direct contact with said bottom portion and said two side panels of said axial slot receiving said particular iron core pole; wherein said second iron core segment (7) is positioned between said first iron core segment (6) and said third iron core segment (8), a height of said first iron core segment (6) along said radial direction is said same as a height of said third iron core segment (8) along said radial direction, a height of said second iron core segment (7) along said radial direction is smaller than said height of said first iron core segment (6) along said radial direction, each of said iron core poles defines one gas partition side panel adjacent to said gas partition channel (30) and has one winding groove provided on said gas partition side panel, and all of said winding grooves of each of said iron core poles of said same armature iron core has said same axial position; wherein said armature coil (2) is an annular armature coil and said armature coil (2) is embedded in said winding grooves of said iron core poles of said armature iron core corresponding to said same armature iron core; wherein each of said plurality number of permanent magnet (3) has a flat-shaped structure and is tangentially magnetized; wherein along said circumferential direction, one piece of permanent magnet (3) is embedded into said center of said first iron core segment (6) of each of said iron core pole, and one piece of permanent magnet (3) is embedded into said center of said third iron core segment (8) of each of said iron core pole; wherein each of said two adjacently positioned permanent magnets (3) along said circumferential direction are arranged in opposite polarities and each of said two adjacently positioned permanent magnets (3) along said axial direction are arranged in opposite polarities; wherein a polar distance τ m is defined as a distance between said two adjacently positioned permanent magnets aligned along said circumferential direction, where a pitch τ p is defined as a distance between two tooth of said rotor teeth (5) which are aligned along said circumferential direction, and a relation between said polar distance and said pitch fulfills the equation 2 τ m =τ p .
Claim: 18. The multi-phase reluctance electric motor with transverse magnetic flux according to claim 17 , characterized in that, wherein said rotor teeth (5) have a high magnetic permeability.
Claim: 19. The multi-phase reluctance electric motor with transverse magnetic flux according to claim 17 , characterized in that, wherein said first iron core segment (6), said second iron core segment (7) and said third iron core segment (8) are integral in structure or non-integral in structure.
Claim: 20. The multi-phase reluctance electric motor with transverse magnetic flux according to claim 17 , characterized in that, wherein a thickness of each of the permanent magnets defined along the tangential direction of a side of the housing is greater than or equal to a thickness of the permanent magnets (3) defined at the gas partition side panel along the tangential direction.
Patent References Cited: 2009/0206686 August 2009 Vollmer
Assistant Examiner: Moraza, Alexander
Primary Examiner: Benitez-Rosario, Joshua
Attorney, Agent or Firm: Novoclaims Patent Services LLC
Wong, Mei Lin
رقم الانضمام: edspgr.09362786
قاعدة البيانات: USPTO Patent Grants
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