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Class 310/256 - Stray field flux loss prevention


Subclass of Class 310 - Electrical generator or motor structure
Definition: Subject matter relating to the prevention of flux loss due
No. of patents: 92
Last issue date: 09/20/2011


1      
NumberTitleIssue Date
8022591Flux screen for generators
A flux screen is provided for shielding a generator stator core from the magnetic field generated by end windings of the stator, wherein the flux screen comprises a frontside to be at least indirectly facing the end windings of the generator and a backside to be at ...
09/20/2011
7884523Brushless DC motor
A brushless DC motor includes a base, a stator, a rotor, and a leak flux absorber. The base couples with the rotor. The stator has a coil module and is mounted on the base. The rotor has a shaft and a permanent magnet, with the rotor coupling with the base through t...
02/08/2011
7843104Stator and stator components of dynamoelectric machines and process of inhibiting joule heating therein
A stator component whose composition and processing enable the component to axially compress magnetic sheets of a stator and also inhibit joule heating of the component to the extent that the need for a separate flux shield can be eliminated. The component is formed...
11/30/2010
7278962Incubator for newborn and premature patients
An incubator for newborn and premature patients includes an air delivery unit with an electric motor and heating and humidifying devices, a control unit including sensing devices to measure air temperature and humidity and a control panel integrally mounted to the i...
10/09/2007
7211917Motor with a magnet fixed on the inner peripheral face of a circumferential wall
A motor includes a circumferential wall part of a case provided with an opening part on one end side in an axial direction and at least a magnet fixed to the inner peripheral face of the circumferential wall part. At least a part of the outer peripheral face of the ...
05/01/2007
7145278Permanent magnet type three-phase stepping motor
A permanent magnet type three-phase stepping motor that is simple in construction, with reduced vibration, a reduced unbalanced force in the radial direction, and high torque that can be manufactured at a low cost. The permanent magnet type three-phase stepping moto...
12/05/2006
7132825Detection device
A device for detecting the displacement of an object comprising a ferromagnetic material, comprises a magnetic circuit generator provided with first and a second cores made of ferromagnetic material and an excitation coil and a measurement coil. The magnetic circuit...
11/07/2006
7112901Construction and method of an electric motor drive
In an electric motor drive, a asynchronous motor, such as drum motor, has a stator (2) mounted on a non-rotatory shaft (1) and has rotatory, like by means of bearings (3), connected rotor (4), is arranged to drive the machine construction...
09/26/2006
7034425Hybrid synchronous electric machine
A hybrid synchronous electric machine driven by the transverse magnetic flux has a rotor and a stator, the rotor armature has a massive cogged iron rings (12) in close vicinity of active parts of the motor, and cogged iron rings (14, 15) as component p...
04/25/2006
7030526Integrated drive motor/differential/inverter unit with improved housing for a vehicle
An integrated drive motor unit which is integrally constituted of a motor, an inverter and a reducer differential unit arranged in a row, and a frame member. The reducer differential unit is connected to an output shaft of the motor, and distributes torque of the mo...
04/18/2006
6927506Low loss reciprocating electromagnetic device
The present invention relates generally to reciprocating electromagnetic devices, and more particularly to a construction of a reciprocating electromagnetic device for reducing secondary losses in magnetically-permeable elements, but without compromising manufactura...
08/09/2005
6920683Process for producing a rotor assembly of a stepping motor
In a stepping motor in which a cylindrical magnet which is magnetized in an axial direction is coupled with a rotary shaft and the magnet is clamped with rotor stacks formed by laminating annular magnetic plates, the surfaces of which are electrically insulated, to ...
07/26/2005
6903469Stepping motor
A stepping motor includes a stator and a permanent-magnet rotor having a rotor axis. The stator is a stator blade made of soft magnetic materials whose center position is a rotor hole accommodating the rotor. Coils are provided on two sides of the stator blade. With...
06/07/2005
6903476Permanent magnet type three-phase stepping motor
A permanent magnet type three-phase stepping motor that is simple in construction, with vibration, a reduced unbalance force in the radial direction, and high torque that can be manufactured at a low cost is disclosed. The permanent magnet type three-phase stepping ...
06/07/2005
6781259Electrical appartus having an actuator
The invention relates to an electrical apparatus having an actuator including at least two permanent magnets (1, 1a) and at least one electrical coil (2) which is movably supported by means of a swing arm (3), which coil is arranged to be...
08/24/2004
6777848Laminated stator body for an electrical machine
a high-voltage generator, notches (3) leading radially inward are provided in each segmental lamination (1) on the radial outside of the laminated stator body and end in a relief opening. The notches (3) cause the amplitude and the frequency of,...
08/17/2004
6750586DC brushless motor structure
A DC brushless motor structure comprises a cylinder-like base having a through-hole or a chamber. The through-hole acts as an axle hole for rotatably receiving a shaft of a rotor. Alternatively, the shaft of the rotor is rotatably received in the chamber. An axle ho...
06/15/2004
6737780Electric motor magnetic flux path structure
An electric motor 10 has an armature 12 including windings 14. The armature is constructed and arranged to rotate a shaft 16. The motor includes a commutator 18 and a brush card assembly 20 having brushes to engage the commu...
05/18/2004
6713929Series-wound motor
A series-wound motor is disclosed which is particularly suitable as a universal motor for an electric power tool. The motor comprises a stator with at least two field poles, each having two pole horns. At least one of the pole horns of each pole comprises first and ...
03/30/2004
6633096Alternator
A brushless generator is composed of a front bracket, a rear bracket, a stator, a rotary shaft, a core, poles, a ring, a field core, a field winding bobbin, and a field winding. Air gaps are defined by facing surfaces between the field core and the core, ...
10/14/2003
6541888Winding body for receiving a winding for an electromagnetomechanical converter and electromagnetomechanical converter
A winding body has a winding area (31) for a winding (13), which winding area (31) is formed by a winding carrier (32) and two legs (34, 35) which define the winding area (31) in axial direction (L) and are connected with the winding carrier (32). The win...
04/01/2003
6484388Sequential roll-forming process for a stator
A process to perform a flaring operation on a rotating electrical device (stator) designed with a number of these spaced axially oriented splines around its perimeter. The design of the stator requires that these perimeter splines possess a flared outer e...
11/26/2002
6455973Magnetic device with flux return strip
A magnetic device having a stator assembly having a magnetic flux return path comprising at least a pair of pole plates located a fixed distance apart from each other and at least one flux return strip pressed between each pair of spaced apart pole plates...
09/24/2002
6310417Hybrid-secondary uncluttered induction machine
An uncluttered secondary induction machine (100) includes an uncluttered rotating transformer (66) which is mounted on the same shaft as the rotor (73) of the induction machine. Current in the rotor (73) is electrically connected to current in the rotor w...
10/30/2001
6242840Electrical machine including toothless flux collector made from ferromagnetic wire
A flux collector for an electrical machine includes a continuous strand of ferromagnetic material; and an electrical insulator covering the strand. The strand forms a tight cylindrical coil including a plurality of turns that are stacked axially. The insu...
06/05/2001
6225714Electric motor, especially a permanently excited direct current motor
The electric motor, especially a permanently excited direct current motor, has a housing (16) carrying a magnetic pole (15) and a grounding ring (17) made from magnetically conductive material and mounted on the housing. In order to reduce the noise gener...
05/01/2001
6194800Magnetic bearing
On the stationary side of a radial bearing constructed of a plurality of magnetic poles, the magnetic poles are formed into a shape such that the magnetic flux density distribution formed between the inner surfaces of these magnetic poles and a rotor loca...
02/27/2001
6157109Dynamoelectric machine with ferromagnetic end winding ring
A dynamoelectric machine such as a motor or generator has an end winding ring of ferromagnetic material in an area of the end winding portions of the stator and/or rotor winding. The end winding ring improves the overall power density of the motor by redu...
12/05/2000
6097129Electronically commutated motor
An electronically commutated external rotor motor has an external rotor having a cup-shaped housing and a radially magnetized permanent magnet connected in the cup-shaped housing. An interior stator is positioned in the cup-shaped housing. The interior st...
08/01/2000
6091173Electromechanical machine having shield arrangement for shaft current reduction
An electromechanical machine includes a stator fixed with respect to a housing structure and a rotor fixed with respect to a shaft. The shaft is rotatably supported by a pair of bearing assemblies maintained in the housing structure. A pair of coilheads e...
07/18/2000
6069431Synchronous generator
A synchronous generator which is driven by an engine whose rotation variation is large and which can easily incorporate an output voltage stabilization circuit. In this synchronous generator, magnetism shorting paths for a magnetic field produced by the a...
05/30/2000
6013965Motor structure
This invention is to provide a low-cost structure that a cogging torque and a torque ripple are small and a stable rotation is provided in a radial gap type motor. A portion that stator pole teeth 37 to become interpoles are provided between stator poles ...
01/11/2000
5886445Extended cage adjustable speed electric motors and drive packages
The rotor cage of a motor is extended, a second stator is coupled to this extended rotor cage, and the windings have the same number of poles. The motor torque and speed can be controlled by either injecting energy into or extracting energy out from the r...
03/23/1999
5723929D.C. Motor with primary and auxiliary magnetic poles
A direct current motor for vehicle engine starters includes a plurality of primary and auxiliary magnetic poles made of permanent magnets arranged between a cylindrical yoke and a cylindrical sleeve inside which an armature is rotatably supported. In orde...
03/03/1998
5698918Small DC motor having a shield band
A shield band, made from grain-oriented silicon metal, is wrapped about a case of a motor to reduce electromagnetic emissions. The case is protected by a strip of tape adhered to an outer surface of the case. The shield band is made by pressing a strip of...
12/16/1997
5642009Quasi square-wave back-EMF permanent magnet AC machines with five or more phases
A new class of higher phase-order (five or more) quasi square-wave back emf permanent magnet machines including radial, axial and linear embodiments which employ a greater number of active phase windings during continuous operation, thereby utilizing more...
06/24/1997
5483113Electric motor for driving a magnetic disk
A cylindrical shielding plate is provided on an inner circumference of the cylindrical recess formed on the bracket of an electric motor of a magnetic disk drive, and an open sector of the stator core is arranged to coincide with the moving direction of r...
01/09/1996
5481151Electromagnetic shield for alternating current induction railway motors
An electromagnetic shield for an AC motor comprises a stack including a plurality of ferro-magnetic shield layers. Each one of the plurality of shield layers is at least partially electrically insulated from and substantially aligned with the others of th...
01/02/1996
5349258Permanent magnet structure for use in electric machinery
Magnetic circuit losses due to unnecessary magnetic fields are greatly curtailed or eliminated relative to the permanent magnet structures of electric machinery, without employing a conventional shunt or pole pieces. At least one coaxial cylinder of magne...
09/20/1994
5344129Elastic mount having fluid chamber partially defined by oscillating plate actuated by moving coil in annular gap between two yokes connected to permanent magnet
A fluid-filled elastic mount including an elastic body elastically connecting a first and a second support, and partially defining a fluid chamber filled with a non-compressible fluid. The elastic mount includes an oscillating plate which partially define...
09/06/1994
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