400 results about "Halbach array" patented technology

A magnetic latch mechanism for latching a first electronic assembly to a second electronic assembly. The magnetic latch mechanism includes a Halbach array captured by the first electronic assembly. The Halbach array is configured to provide a first magnetic flux in a first direction. The magnetic latch mechanism further includes an attraction plate captured by the second electronic assembly. The attraction plate is configured to be coupled with the first magnetic flux when the first electronic assembly is in a closed position with respect to the second electronic assembly such that there is mutual attraction between the attraction plate and the Halbach array in the closed position.

A pump includes an impeller, a stator, and a plurality of magnets forming bearing poles coupled to a selected one of the stator or the impeller. The pump further includes a plurality of shorted coils coupled to the other of the stator and the impeller. The plurality of bearing poles and shorted coils co-operate to form an electrodynamic bearing during rotation of the impeller. The electrodynamic bearing supports the impeller either axially or radially during operation of the pump. Hydrodynamic bearing surfaces are provided for generating a hydrodynamic bearing between the impeller and stator. The plurality of magnets may comprise a plurality of distinct magnetic elements or a single element comprising a plurality of distinct magnetic domains. The plurality of distinct magnetic elements or domains may be arranged to form a Halbach array.

Electric motor configurations are provided with Halbach arrays. In one example, an electric motor includes a first plurality of magnets arranged in a first Halbach array. The first plurality of magnets is configured to provide a first magnetic field that substantially exhibits a first Halbach flux distribution. A first plurality of electromagnets comprising a first plurality of coils are arranged in a second Halbach array. A controller is adapted to selectively direct current through the first plurality of coils to induce a second magnetic field to interact with the first magnetic field. The second magnetic field substantially exhibits a second Halbach flux distribution.

A motor/generator having its stationary portion, i.e., the stator, positioned concentrically within its rotatable element, i.e., the rotor, along its axis of rotation. The rotor includes a Halbach array. The stator windings are switched or commutated to provide a DC motor/generator much the same as in a conventional DC motor/generator. The voltage and power are automatically regulated by using centrifugal force to change the diameter of the rotor, and thereby vary the radial gap in between the stator and the rotating Halbach array, as a function of the angular velocity of the rotor.

An audio speaker having a voicecoil running along a diaphragm surface, and a magnetic array, e.g., a Halbach array, configured to direct a magnetic field toward the voicecoil to drive the diaphragm and generate sound. In an embodiment, multiple Halbach arrays are used to drive the same voicecoil winding or to drive separate, respective voicecoil windings on the diaphragm surface. Other embodiments are also described and claimed.

A periodic magnetic field generation device is provided with a field pole of a Halbach array structure in which main pole permanent magnets magnetized in a direction of a generated field and sub pole permanent magnets magnetized in a direction opposite to the direction of magnetic poles of the main pole permanent magnets are alternately disposed linearly or circularly so as to be adjacent to each other. A part of each of the main pole permanent magnets on a side on which the magnetic field is generated is replaced by a soft magnetic member, and a relation between a length A of the soft magnetic member on the side of the generated field along a moving direction and a length B of each main pole permanent magnet on a side of a back yoke along the moving direction is A<B.

An axial flux brushless permanent magnet electrical machine having a stator and at least one rotor. The rotor includes a Halbach array of magnets with at least four magnets per magnetic cycle. The rotor magnets are contained within pockets in the rotor. The pockets are formed with magnet pocket walls being radial walls, active surface walls, and/or inactive surface walls where the walls retain the magnets within the pockets.

The invention provides a magnetic field modulating type concentric magnetic gear transmission device in a Halbach magnet structure, which comprises a shell, an outer rotor and an inner rotor, whereinthe outer rotor and the inner rotor are installed in an inner cavity of the shell and are in a cantilever type; the inner rotor comprises an inner rotor iron core and a permanent magnet, which are installed on an output shaft of the inner rotor; the outer rotor comprises an outer rotor iron core and a permanent magnet, which are installed on an output shaft of the outer rotor; a magnetic modulation ring is arranged between the permanent magnet of the inner rotor and the permanent magnet of the outer rotor; and the magnetic modulation ring comprises an iron core block and is fixed on an end plate of the shell. The magnetic gear transmission device comprises two layers of air gaps, wherein an inner-layer air gap is formed between the inner rotor and the magnetic modulation ring, and an outer-layer air gap is formed between the outer rotor and the magnetic modulation ring. The magnet structure uses a Halbach array to replace the conventional radial structure, thereby improving the magnetic density distribution of the air gaps of the magnetic gear transmission device. Because the magnetic density of the air gaps approaches to sinusoidal distribution, the detent torque of the magnetic gear transmission device in the structure is greatly reduced, thereby decreasing the vibration and noise of the magnetic gear transmission device and improving the running efficiency.

A motor/generator has its stationary portion, i.e., the stator, positioned concentrically within its rotatable element, i.e., the rotor, along the axis of rotation of the rotor. The rotor includes a Halbach array of magnets. The voltage and power outputs are regulated by varying the radial gap in between the stator windings and the rotating Halbach array. The gap is varied by extensible and retractable supports attached to the stator windings that can move the windings in a radial direction.

The invention discloses a controllable-flux permanent magnet synchronous motor and a control system for an electric vehicle. A permanent magnet rotor of the motor is in a built-in mixed type rotor magnetic path structure, an Nd-Fe-B permanent magnet and an Al-Ni-Co permanent magnet of the rotor iron core are arranged according to the matrix way of Halbach, a certain gap is arranged between each electrode of the rotor, and the Nd-Fe-B permanent magnet and the Al-Ni-Co permanent magnet are embedded in silicon steel sheets; the Nd-Fe-B permanent magnet is used as the main magnetic flux of the motor rotor, and the magnetizing direction of the Nd-Fe-B permanent magnet is diagonally magnetizing; and the Al-Ni-Co permanent magnet is magnetized radially, and the magnetizing direction is controlled by direct-axis current Id of the control system to be used as the adjusting magnetic flux of the motor rotor. The controllable-flux permanent magnet synchronous motor and the control system for the electric vehicle have the advantages that the magnetic flux state of the motor rotor is changed through applying a direct-axis current Id with controllable amplitude by the control system, so that the magnetic flux provided by the rotor to the stator is minimal; three-phase lines of the motor are short-circuits, the back electromotive force of the motor approaches to zero, and the braking torque is extremely low, thereby guaranteeing the electric safety and torque safety of a vehicle under the state that the system stays in failure.

An iron core free permanent magnetic and synchronous motor of AC disc type based on Halbach array is prepared as applying double external rotator structure, binding magnetic steel disc at inner wall of external rotator, applying Halbach permanent magnet array structure for magnetic steel disc to generate axial magnetic field, utilizing iron core free structure for stator armature being formed by winding injection directly, using double rotators and stator armature to form air gap at two sides. The prepared motor is suitable to be used at occasion of applying large torque and direct driving.

The invention discloses a Halbach array external rotor of a composite-structure permanent magnet motor, relating to an external rotor of a composite-structure permanent magnet synchronous motor and solving the problems of magnetic coupling and flexible selection of pole numbers of a composite-structure motor. A rotor core of the external rotor is of a cylindrical iron core, all permanent magnets in the outer layer and the inner layer of Halbach permanent magnet array are tile-shape permanent magnets which are evenly distributed inside and outside the rotor core in the circumferential direction, and the inner surfaces of one sides of the tile-shaped permanent magnets with weakened magnetic field in the outer layer Halbach permanent magnet array and the outer surfaces of one sides of the tile-shaped permanent magnets with weakened magnetic field in the inner layer Halbach permanent magnet array are respectively and fixedly connected with the outer surface and the inner surface of the rotor core. Magnetic flux in the rotor core is extremely less whether pole numbers are equal or not, so that independent control can be realized, a whole hybrid power system is in coordinated operation, and motors combined together can flexibly select magnetic pole numbers as required by actual power grade and base speed.

The invention discloses a magnetic-concentrating-type consequent-pole cursor permanent magnet motor, which comprises a primary core and a secondary core, wherein a plurality of open slots are formed in the primary core; armature windings are arranged in the open slots of the primary core; the secondary core and the primary core are arranged at an interval and can oppositely move; Halbach permanent magnets are arranged in notches of the open slots of the primary core, thereby forming a Halbach (Halbach) permanent magnet array; a plurality of open slots which are arranged at intervals are formed in the surface, relative to the primary core, of the secondary core and permanent magnets are arranged in the open slots, thereby forming an excitation permanent magnet array; and the magnetization direction of the Halbach permanent magnet array is matched with that of the excitation permanent magnet array. Through comprehensive application of a consequent-pole structure and a Halbach array, the air-gap flux density of the motor is significantly strengthened, the air-gap electromagnetic power transmission capacity of the motor is improved, the electromagnetic properties of the counter electromotive force, the thrust density, the power factor and the like of the motor are improved, and reduction of the volume of the motor, improvement of the acceleration performance of the motor and reduction of the capacity of a frequency converter are facilitated.

An axial stabilizer for the rotor of a magnetic bearing provides external control of stiffness through switching in external inductances. External control also allows the stabilizer to become a part of a passive/active magnetic bearing system that requires no external source of power and no position sensor. Stabilizers for displacements transverse to the axis of rotation are provided that require only a single cylindrical Halbach array in its operation, and thus are especially suited for use in high rotation speed applications, such as flywheel energy storage systems. The elimination of the need of an inner cylindrical array solves the difficult mechanical problem of supplying support against centrifugal forces for the magnets of that array. Compensation is provided for the temperature variation of the strength of the magnetic fields of the permanent magnets in the levitating magnet arrays.

Halbach Array electric motor with substantially contiguous electromagnetic cores, comprised of a plurality of electromagnets arranged in Halbach Array sequence, whose horizontal cores are equipped with fork-like prongs to provide substantial contiguity with vertical cores, assembled to serve as a circular or linear stator, rotor or both, and a plurality of permanent magnets likewise arranged in a Halbach Array sequence, assembled to serve as a circular or linear stator or rotor where required.

An electromagnetic transducer, such as an audio speaker, having a voicecoil disposed within a magnetic gap between a pair of magnetic arrays, e.g., Halbach arrays, is disclosed. In an example, the paired Halbach arrays include vertically-poled magnets to direct magnetic flux across the magnetic gap orthogonal to electrical current carried by a planar winding of the voicecoil. Accordingly, a Lorentz force may drive an oscillational mass, e.g., a speaker diaphragm, in a longitudinal direction orthogonal to the magnetic flux and the electrical current to generate vibration or sound. Other embodiments are also described and claimed.

A Halbach array is radially disposed in an environment optimized for efficiency and controlled for efficient generation and use of power in order to generate, establish, and maintain a desired level of rotational energy with enhanced efficiency.

The invention relates to a Halbach array parallel rotor composite excitation brushless synchronous motor, which comprises a rotor and a stator for accommodating the rotor, wherein the stator comprises a magnetic groove sleeve, an annular exciting winding and the like; the magnetic groove sleeve is fixed on a motor end cover through bolts and is not contacted with the rotor; and the annular exciting winding is fixed at the groove of the magnetic groove sleeve. The rotor consists of a rotating shaft and a Halbach rotor and an electric excitation rotor which are arranged on the rotating shaft in parallel, and the Halbach rotor comprises a non-magnetic rotor supported by the rotating shaft and a Halbach array permanent magnet arranged on the surface of the non-magnetic rotor; the electric excitation rotor comprises a claw pole structure connected with the rotating shaft; and the Halbach rotor is separated from the electric excitation rotor by a separating magnetic ring formed by air gaps. The brushless synchronous motor can reduce the eddy current loss of the rotor, enlarge the adjustable range of a magnetic field and improve the power density of the motor, and has the advantages of high reliability and good energy-saving effect.

The invention relates to a sectional type Halbach array permanent magnet motor magnetic field calculation method. The sectional type Halbach array permanent magnet motor magnetic field calculation method comprises the steps of determining solution areas, respectively building Laplace's equations or Poisson's equations for the different solution areas, calculating the interval between magnetic blocks of a sectional type Halbach array, solving the radial and tangential component amplitudes under each order of harmonic waves of residual magnetization intensity of a permanent magnet, solving the built Laplace's equations or Poisson's equations, obtaining an expression of a scalar magnetic potential in the solution areas, and further obtaining radial and tangential components of flux densities of the areas. The sectional type Halbach array permanent magnet motor magnetic field calculation method can accurately solve the magnetic field of an inner and outer rotor sectional type Halbach array permanent magnet motor with any magnetic block number of each pole and any number of pole pairs.

A first movable element includes a first Halbach array permanent magnet array. A second movable element placed in operable proximity to said first Halbach array includes a second Halbach array permanent magnet array. The first Halbach array is configured to transmit torque upon movement to the second movable element by magnetic force, wherein the torque is transferred with no physical contact occurring between the first movable element and the second movable element.

A wind turbine comprises a turbine shroud and optionally an ejector shroud. The wind turbine encloses a permanent magnet ring generator. A static ring of phase windings is located in the turbine shroud, and wind airflow causes a rotor having permanent magnets thereon to rotate, creating an electric current in the static ring. The permanent magnets are arranged to form a Halbach cylinder with the magnetic field being exterior to the rotor.