EP0154335A2
Expired / Lapsed
EP
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Magneto d.c. motor
Assignee: Hitachi Ltd
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Filing: 1985-03-06
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Granted: —
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Expires: 2005-03-06
Abstract
Abstract A plurality of permanent magnets (4) are disposed with gaps between the adjacent magnets along the inner peripheral surface of a yoke (2) of a stator for a magneto D.C. motor. In gaps between two magnets are provided retainers (3) each of which is made of an elastic member and consists of one surface (11) fixed on the yoke, two surfaces (12, 13) extending in the central axial direction of the D.C. motor along the side surfaces (71, 72) of the magnets opposite to each other on the inner peripheral surface of the yoke and two end portions (32) connecting these two surfaces (12, 13). Those two surfaces (12, 13) and end portions (32) are kept in contact with the permanent magnet from three directions, namely from each of the side surfaces (71, 72) of the permanent magnet and from each of the end surfaces (81, 82) of the magnets adjacent to said each side surface (71,72) extending in the central axial direction whereby the permanent magnets are pressed and clamped so as to be secured to the yoke.
Inventors
- 👤 Tosio Tomite
- 👤 Shotaro Naito
- 👤 Nobuhiko Ogasawara
- 👤 Tatsuhiro Tani
- 👤 Hidemitsu Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 19:13
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/12; H02K1/17
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
195 words
A magneto D.C. motor comprising: a stator having a plurality of permanent magnets disposed on the inner periphery of a yoke with gaps between two adjacent magnets; a rotor which rotates around the central axis of said stator by excitation; retainers (3) each of which consists .of a surface (11) which is secured to said yoke in said gap, two surfaces (12, 13) which connect to said surface, is made of an elastic member, and extend in a direction of the central axis(o)of said D.C. motor along the side surfaces (71, 72) of said magnets (4) opposite to each other across said gap (9), and two end portions (32) which connect to said two surfaces, respectively, are made of an elastic member, and extend along the end surfaces (81, 82) of said magnets adjacent to said side surfaces extending in a direction of the central axis of said D.C. motor; said two surfaces (12, 13) and said two end portions (32) securing said permanent magnets to said yoke by pressing and clamping said magnets while contacting with said magnets from three directions, namely from said side surfaces (71, 72) and said end surfaces (81, 82).
Claim 2
Dependent Claim
195 words
A magneto D.C. motor comprising: a stator having a plurality of permanent magnets disposed on the inner periphery of a yoke with gaps between two adjacent magnets; a rotor which rotates around the central axis of said stator by excitation; retainers (3) each of which consists .of a surface (11) which is secured to said yoke in said gap, two surfaces (12, 13) which connect to said surface, is made of an elastic member, and extend in a direction of the central axis(o)of said D.C. motor along the side surfaces (71, 72) of said magnets (4) opposite to each other across said gap (9), and two end portions (32) which connect to said two surfaces, respectively, are made of an elastic member, and extend along the end surfaces (81, 82) of said magnets adjacent to said side surfaces extending in a direction of the central axis of said D.C. motor; said two surfaces (12, 13) and said two end portions (32) securing said permanent magnets to said yoke by pressing and clamping said magnets while contacting with said magnets from three directions, namely from said side surfaces (71, 72) and said end surfaces (81, 82).
Claim 3
Dependent Claim
93 words
A magneto D.C. motor according to claim 1, wherein auxiliary poles (5) are disposed adjacently to each permanent magnet(4)along the inner periphery surface of said yoke, and said permanent magnet (4) and said auxiliary pole (5) are secured to said yoke by clamping said permanent magnet (4) with a first supporting part (3a) of said retainer which extends in the central axial direction of said D.C. motor, and clamping said auxiliary pole (5) with a second supporting part (3b) of said retainer which extends in the central axial direction of said D.C. motor.
Claim 4
Dependent Claim
48 words
A magneto D.C. motor according to claim 1, wherein the width (Ls) of each of said supporting parts (3a, 3b) is made narrower than the axial length (Lm) of said magnet (4) clamped by each of said supporting parts, thereby to give said retainer an adequate clamping force.
Claim 5
Dependent Claim
65 words
A magneto D.C. motor according to claim 2, wherein the side surfaces in the axial direction of said permanent magnet (4) and said auxiliary pole (5) are formed so as to be tangential planes (4a, 5a) radial from the central axis (O) of said yoke (2), whereby said side surfaces of said permanent magnet and said auxiliary pole may be in contact with each other.
Claim 6
Dependent Claim
106 words
A magneto D.C. motor according to claim 2, wherein first elastic portions (32) are formed on both ends of said supporting part (3a) such as to clamp therebetween the first object to be clamped (4) which has been inserted by said first supporting part from the peripheral direction, and a second elastic portion (34) is formed on one end of said second supporting part (3b) and a pawl (31) is formed on the other end thereof, such as to clamp therebetween the second object to be clamped (5) which has been inserted from a direction of said pawl along a direction of said second elastic portion.
Claim 7
Dependent Claim
63 words
A magneto D.C. motor according to claim 2, wherein said auxiliary pole (5) is united with said yoke (2) into one body, said permanent magnet (4) is adjacent to said auxiliary pole (5) with a retainer (6) made of an elastic member disposed in said gap therebetween, and said permanent magnet (4) is secured to said yoke with the support of said retainer.
Claim 8
Dependent Claim
83 words
A magneto D.C. motor according to claim 6, wherein elastic portions (62a, 62b) are provided on one end portion of each of said first and second supporting parts (3a, 3b), respectively, and pawls (61a, 61b) on the other end thereof, respectively, such that said first and second supporting parts insert said objects to be clamped (4, 5) from the direction of said pawls along the direction of said elastic portions so as to clamp said objects between said elastic portions and said pawls.
Claim 9
Dependent Claim
34 words
A magneto D.C. motor according to claim 1, said permanent magnets (4) have, along the inner periphery thereof, an elastic steel belt (8) for pressing said permanent magnets in a direction of said yoke.
Claim 10
Dependent Claim
33 words
A magneto D.C. motor according to claim 1, wherein said retainer (3) has, on the surface contacting with said yoke, reinforcing ribs (34) which are formed along the peripheral direction of said yoke.
Claim 11
Dependent Claim
60 words
A magneto D.C. motor according to claim 1, wherein said retainer (3) has bores (33) for securing said retainer to said yoke (2) by charging a yoke member into said bores 33 from the outer periphery of said yoke 2 by pressing said bores with presses and by plastic bonding after said retainer (3) is set on a mold (61).
References Cited (Backward Citations)
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