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| Number | Title | Issue Date |
| 7443069 | Stator structures Stator structures are provided. A stator structure includes at least a magnetic conductive layer and at least a first auxiliary magnetic polar layer. The magnetic conductive layer comprises a plurality of first salient poles. The first auxiliary magnetic polar layer... | 10/28/2008 |
| 7098564 | Work piece A work piece according to the invention has caulking tabs that are connected to each other by means of a bridge piece. As a result, the caulking tabs are lengthened, thus permitting better control of the caulking process because the caulking tabs overlap a component... | 08/29/2006 |
| 7015604 | Stepping motor and method of manufacturing stepping motor A stepping motor includes: a rotary shaft; a rotor magnet mounted fixedly on the rotary shaft; a bearing member including a smaller-diameter portion and a larger-diameter portion, and supporting the rotary shaft; and a yoke including a plurality of magnetic pole tee... | 03/21/2006 |
| 6995488 | Permanent magnet field small DC motor A permanent magnet field small DC motor includes an arc-shaped rare earth magnet of maximum thickness 1 mm or less fabricated by compression molding from rare earth iron based melt-spun flakes and a binder. The magnet is provided with a certain specific portion at b... | 02/07/2006 |
| 6867523 | Brush motor A brush motor has a magnetic sensor provided for detecting a change in a field magnet occurring in correspondence with a change in a rotational position of a rotor core. ... | 03/15/2005 |
| 6708388 | Method of making a permanent magnet field-type compact DC motor A permanent magnet field-type compact DC motor having a high output and a low cogging torque is made by fixing a pair of rare earth magnets mainly composed of rare earth-iron-based rapidly quenched and solidified flakes to a soft magnetic frame so as to extend along... | 03/23/2004 |
| 6376956 | Permanent magnet pole arrangement of motor A pole arrangement of a motor includes a plurality of permanent-magnet main poles disposed annularly at equal intervals on the inner periphery of a yoke, a plurality of auxiliary poles disposed between adjacent two of the main poles, and a plurality of ma... | 04/23/2002 |
| 5698921 | Permanent magnet type motor A permanent magnet type motor comprising: a field magnet including permanent magnet arranged inside a yoke in an 8-pole structure; and an armature including an armature coil and armature core, the armature coil and the armature core arranged inside the field m... | 12/16/1997 |
| 5091667 | D.C. machine of type having permanent magnets with auxiliary poles A direct current machine is characterized in that each of field poles and an armature are formed to satisfy a condition that an internal peripheral width Wa of each auxiliary pole is equal to or greater than a distal end width Wt of each tooth and equal t... | 02/25/1992 |
| 5089737 | DC rotary electric machine of permanent magnet field type A novel DC rotary electric machine of permanent magnet field type is disclosed, in which a plurality of permanent field magnets having an auxiliary pole of magnetic material are arranged alternately with a plurality of field magnets including only a magne... | 02/18/1992 |
| 5083054 | Permanent magnet field type DC machine A permanent magnet field type DC machine in which the amount of flux from field poles is changed by effective use of armature reaction thereby to improve characteristics of the DC machine. There is provided a permanent magnet field type DC machine having ... | 01/21/1992 |
| 4980593 | Direct current dynamoelectric machines utilizing high-strength permanent magnets A direct current dynamoelectric machine is disclosed including plural main poles on a field frame with a wound armature rotatably mounted therein. The main poles utilize high-strength permanent magnets which are thick enough to supply a magnetic field, bu... | 12/25/1990 |
| 4918830 | Method of preparing a permanent magnet DC machine A permanent magnet DC machine is prepared by attaching auxiliary magnetic poles having higher reversible permeability than that of main magnetic poles constituted by anisotropic permanent magnets which are to be attached to the inner circumferential surfa... | 04/24/1990 |
| 4914334 | Permanent magnet DC machine A permanent magnet DC machine comprising a rotor and a stator diametrically opposed to the rotor through a fine air gap therebetween. The stator comprises a yoke, main magnetic poles of anisotropic permanent magnet provided on an inner circumferential sur... | 04/03/1990 |
| 4851727 | Permanent magnet type electric motor A permanent magnet type electric motor has stoppers for restricting axial movement of field magnetic poles each composed of a permanent magnet and an auxiliary pole 13 in a cylindrical yoke thereof. The stoppers may be protrusions 17 arranged in the yoke ... | 07/25/1989 |
| 4827173 | Commutator motor, especially a small motor for motor vehicles In a permanent-magnet-excited commutator motor, especially a small motor for motor vehicles, the short-circuit ring (13) of the stator (12) has soft iron auxiliary poles (16), to attain an inverse speed characteristic. The permanent magnets (15) rest with... | 05/02/1989 |
| 4823037 | DC Electric motor having field poles of permanent magnet A DC electric motor which comprises: a reversibly rotatable rotor having an armature core, an armature winding and a commutator; a stator having a yoke and a plurality of field poles provided on an inner circumference of the yoke and each having a permane... | 04/18/1989 |
| 4794291 | Permanent magnet field DC machine A permanent magnet field DC machine comprises a rotor and a stator. The rotor comprises an armature core (3), an armature winding (4), and a commutator (2). The stator comprises a yoke (7), permanent magnets (8) disposed on the inner periphery of the yoke... | 12/27/1988 |
| 4745319 | Magneto D.C. motor having elastic magnet mounting retainers A plurality of permanent magnets (4) are disposed with gaps between adjacent magnets along the inner peripheral surface of a yoke (2) of a stator for a magneto D.C. motor. In gaps between magnets, there are provided retainers (3), ech of which is made of ... | 05/17/1988 |
| 4707630 | Magnetic cover member for magnetic poles of DC motor In a permanent type DC motor, a stator comprises a yoke and a plurality of magnetic pole pairs composed of permanent magnets and auxiliary poles. The plurality of magnetic pole pairs are held and fixed in intimate contact with the yoke by pressingly defor... | 11/17/1987 |
| 4703210 | Miniature electric non-uniform magnetization rotating machine A miniature electric rotating machine has a stator equipped with a field pole on a peripheral circle of a rotor, and the field pole is constituted by a permanent magnet. Each permanent magnet of a miniature electric rotating machine of this type can be di... | 10/27/1987 |
| 4687608 | Composite permanent magnet for magnetic excitation and method of producing the same The present invention relates to a composite permanent magnet for magnetic excitation, used in a permanent type rotary machine such as permanent magnet type generators or permanent magnet type motors, which composite magnet comprises a first part and a se... | 08/18/1987 |
| 4580072 | Stator for magnet-type rotating machines A stator for magnet-type rotating machines comprises projections formed in the inner circumferential surface of a fixed frame in the circumferential direction at a predetermined distance. Position determining pieces, each having elasticity and engaging pa... | 04/01/1986 |
| 4554474 | Stator for a magnet motor A stator for a magnetic motor comprising a cylindrical yoke, at least one pair of main magnetic poles formed of permanent magnets fixed to the inner peripheral surface of the yoke, at least one pair of auxiliary magnetic poles made of a soft iron material... | 11/19/1985 |
| 4542314 | Permanent-magnet commutator motor with auxiliary pole/bracket A permanent-magnet excited commutator motor, particularly a multipole small motor, has a stator yoke, an armature, two permanent magnet elements having a relatively low permeability, the permanent magnet elements having end tips with a gap formed between,... | 09/17/1985 |
| 4510407 | Permanent magnet type motor having improved pole structure A permanent magnet type motor having a stator which comprises a yoke, a plurality of main magnetic poles made of permanent magnets, and a plurality of auxiliary magnetic poles, each of the main magnetic poles and each of the auxiliary magnetic poles being... | 04/09/1985 |
| 4491756 | Direct current dynamoelectric machine of permanent magnet type A d.c. dynamoelectric machine of permanent magnet type comprises an armature and a plurality of field poles, wherein each of the poles comprises a main pole part (a permanent magnet) composed by an integral combination of a first magnet formed of a magnet... | 01/01/1985 |
| 4469969 | Permanent magnet field type starting motor provided with an auxiliary pole A permanent field type starting motor is provided with a permanent magnet, and a non-permanent magnet auxiliary pole which has higher reversible permeability than that of the permanent magnet. The auxiliary pole is disposed in the circumferential directio... | 09/04/1984 |
| 4383193 | Field pole structure of DC motor A field pole structure of a DC motor has a plurality of field magnetic poles attached to the inner surface of a yoke of the DC motor to oppose an armature. Each magnetic pole includes a permanent magnet, and an auxiliary pole member coupled to an end of t... | 05/10/1983 |
| 4237397 | Electric machine, especially small motor A permanent magnet stator having two arcuate permanent magnet segments, each composed of two subsegments.... | 12/02/1980 |
| 4110718 | Magnetic structure, particularly permanent magnet for motor fields, and method To provide a magnet which has both the qualities of high remanence, or retentivity and coercive force, and is resistant to demagnetizing fields, the magnet is made in at least two zones of which the central or segmental zone is made of a magnetic material... | 08/29/1978 |
| 3978354 | Permanent magnet electrical machines Electrical machines comprising a rotatable armature and permanent magnets surrounding and separated from the armature by air gaps having a length to width ratio not greater than 60:1 and a minimum width of 0.040 inch irrespective of the length to width ra... | 08/31/1976 |
