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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 8063529 | Motor A motor comprises a stator and a rotor (20) disposed within the stator. The stator comprises a shell comprising a plurality of sidewalls (10a-10d) and arcuate connection parts (11a-11d) connecting neighb... | 11/22/2011 |
| 8049387 | Electric motor An electric motor has a rotor (20), a housing (10) and a ring magnet (12) fixed onto an inner surface of the housing. The housing (10) has a cross section in a polygon, preferably tetragonal, shape that comprises a plurality of side porti... | 11/01/2011 |
| 7714472 | Small DC motor A small DC motor includes a motor frame having a cylindrical portion, the cylindrical portion having a constant thickness and having a cross section in a shape that comprises four sides and connecting portions, each of the connecting portions connecting adjacent two... | 05/11/2010 |
| 7436094 | Rotary actuator A rotary actuator has a stator having plural permanent magnets 1a and 1b; a rotor having a rotor core 3 which plural salient poles 3a and 3b are formed at, and one or more rotor coils 5 are wound ... | 10/14/2008 |
| 7427817 | Small-sized motor having polygonal outer shape A small-sized motor having a polygonal outer shape includes four or more field magnets attached to the inner surface of a motor casing made of metal. A tubular portion of the motor casing is formed into a polygonal tubular shape such that flat side portions equal in... | 09/23/2008 |
| 7081698 | Efficient motor The present invention is directed to a method and system for improving motor efficiency. The motor of the present invention may provide at least 1.9 Horsepower (HP) while drawing 15–16 Amperes at 120 Volts. The motor of the present invention may provide at least 7... | 07/25/2006 |
| 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 |
| 6987340 | DC motor with brushes A DC motor includes a stator of magnets surrounding a rotor containing coils of wire surrounding cores. Brushes serve to repeatedly start and interrupt the supply of current to the individual coils via respective commutator segments of the rotor in order to rotate t... | 01/17/2006 |
| 6927518 | Direct current machine having continuously arranged magnetic poles When one of armature coils is in a beginning of a commutation process, a center line of a trailing end tooth of a corresponding group of teeth, around which the one of the armature coils is wound, is generally aligned with a corresponding boundary between magnets. W... | 08/09/2005 |
| 6917132 | DC brush motor and permanent magnet used therein The challenge to be solved by the present invention is the miniaturization of a 1-300 W class of motor. This can be achieved by using a hollow-cylinder shaped anisotropic bonded magnet magnetized in a 4-pole configuration. The anisotropic bonded magnet has a maximum... | 07/12/2005 |
| 6777842 | Doubly salient machine with permanent magnets in stator teeth Permanent magnet machines including doubly salient machines having one or more permanent magnets located at least partly and preferably entirely within the stator teeth, thereby avoiding weakening of the stator structure while reducing acoustic noise. The magnets ma... | 08/17/2004 |
| 6769168 | Flux ring for an electric motor A flux ring for a motor of a power tool has an annular housing which fits inside the motor can of the motor. At least one magnet is on the ring. The at least one magnet includes a portion formed from an isotropic magnetic material and a portion formed from an anisot... | 08/03/2004 |
| 6724114 | Doubly salient machine with angled permanent magnets in stator teeth Permanent magnet machines including doubly salient machines having one or more permanent magnets located at least partly and preferably entirely within the stator teeth, thereby avoiding weakening of the stator structure while reducing acoustic noise. The magnets ma... | 04/20/2004 |
| 6724113 | Reduced backlash zero cogging reversing transmission Embodiments of the present invention are directed to gear transmission apparatus that are configured to largely eliminate the cogging effects and to reduce the backlash effects. In one embodiment, a transmission apparatus comprises a follower gear, a first drive gea... | 04/20/2004 |
| 6509662 | DC motor A DC motor which is small in size and capable of effecting a higher output, and in which magnet size is determined through a parameter by which the peak output characteristic corresponding to the shape and size of the yoke can be recognized properly.... | 01/21/2003 |
| 6462448 | Flux ring for an electric motor A flux ring for a motor of a power tool has an annular housing which fits inside the motor can of the motor. At least one magnet is on the ring. The at least one magnet includes a portion formed from an isotropic magnetic material and a portion formed fro... | 10/08/2002 |
| 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 |
| 5329267 | Magnet assembly and a voice coil motor using such magnet assembly Magnet assemblies for installation into a voice coil motor is described. A pair of magnetic pieces are molded into circular arc shapes of different radii and positioned concentrically across a gap. The ends of such the pair of magnet pieces, are joined to... | 07/12/1994 |
| 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 |
| 5034641 | Rotary machines with permanent magnet The invention relates to an improvement in the design of the magnetic circuit in a permanent-magnet rotary machine, e.g., a servomotor, with an object to stabilize the output of the motor with respect to temperature variation. The inventive improvement is... | 07/23/1991 |
| 4900963 | D.C. motor A D.C. motor is provided with a higher sustaining torque by providing an ascially extending slot on each tooth of an armature core. The slot is located in the center of the outer surface of each tooth opposite the field magnets.... | 02/13/1990 |
| 4833355 | Motor with armature teeth and field magnet A motor includes an armature and a field magnet which surrounds the armature. The armature includes a plurality of teeth being arranged at equal pitch, and the field magnet includes a plurality of magnetic poles being arranged at equal pitch. When the num... | 05/23/1989 |
| 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 |
| 4774426 | Commutator machine having a permanent magnet stator A commutator machine, in particular a small direct-current motor, has at least one pair of permanent magnets (11) retained on a magnetic short-circuit element (10), the permanent magnets being of a single-substance ferrite material or a multi-substance ma... | 09/27/1988 |
| 4590635 | Machine for floor maintenance A machine for floor maintenance comprising an electric motor in which armature coils are included in a stator and permanent magnets are included in a rotor. The armature coils are disposed substantially radial to the axis of the stator with the axial exte... | 05/27/1986 |
| 4574214 | Electric rotary device of permanent magnet type An electric rotary device of permanent magnet type has a stator including a plurality of permanent magnets and a rotor rotatably mounted within the stator and including an armature core and a plurality of windings wound around the armature core, said perm... | 03/04/1986 |
| 4532449 | DC motor A DC cored motor in which the rotor core has an odd number of slots to accept a corresponding number of coils which are connected to a commutator with a doubled number of segments, characterized by a combination of 2n+1 slots with 2n magnetic poles in the... | 07/30/1985 |
| 4508988 | Permanent magnet motor stator for d.c. motors In a permanent magnet commutator type D.C. servomotor having a wound iron core armature and a permanent magnet stator, the stator includes a uniquely formed annular yoke. The unique yoke includes a central opening and a plurality of permanent magnet pole ... | 04/02/1985 |
| 4460839 | Magnetic laminae sections for single air gap motor A dynamoelectric machine having a stator of permanent magnet segments, each segment being formed of a plurality of laminae concentrically oriented with respect to the armature, wherein an outer laminae exhibits demagnetization characteristics effective to... | 07/17/1984 |
| 4283647 | Annular segment permanent magnet single air gap electric motor A single air gap permanent magnet electric motor is provided with field magnets formed as thick annular segments concentric with the axis of rotation of a solid non-magnetic cylindrical armature. The field magnets are magnetized radially to the axis and h... | 08/11/1981 |
| 4237397 | Electric machine, especially small motor A permanent magnet stator having two arcuate permanent magnet segments, each composed of two subsegments.... | 12/02/1980 |
