224results about How to "Improve the magnetic effect" patented technology

Described herein are devices, systems and methods to enhance the magnetic perturbation of a neuronal (e.g., brain) target during Transcranial Magnetic Stimulation (TMS), thereby enhancing the induced current in the target. In general, these devices, systems and methods enhance the magnetic perturbation (dB/dt) of the target by mechanically moving a TMS electromagnet (e.g. coil) at a frequency of greater than 1 kHz.

The invention discloses a multitooth magnetic bridge type hybrid excitation magnetic flux switching motor. Permanent magnets, an armature winding and a single-phase excitation winding are installed on a stator; the tooth number of the stator is four times of the number of the permanent magnets; and part of a rotor part is a salient pole, and a rotor has no winding or permanent magnets and has simple and firm structure. An air gap magnetic field comprises an electric excitation magnetic field generated by the excitation winding and a magnetic field generated by the permanent magnets and is adjusted by changing the magnitude and the direction of excitation current, thereby improving the rotating speed operating range and the magnetic weakening capability of the motor. An electric excitation magnetic force line is connected with a magnetic bridge for closing after penetrating through an iron core at the top of the permanent magnets, which is beneficial to reducing the electric excitation ampere turns. The invention has parallel connecting structure of the excitation winding and the permanent magnet in space, bipolarity of phase magnetic flux, large magnetic chain change amplitude value and higher torque output capability and power density and is suitable for a low-speed straight application occasion.

The present invention provides a ferrite magnetic material capable of attaining such magnetic properties that Br+(⅓)HcJ is 6200 or more even by sintering at a temperature of 1150° C. or lower. The ferrite magnetic material includes as a main phase thereof a ferrite phase having a hexagonal structure, the main phase being represented by the following composition formula (1): La_xCa_mα_1−x−m(Fe_12−yCo_y)_z with α representing one or two of Ba and Sr; wherein the constituent ratios of the metal elements constituting the main phase satisfy the following conditions: x and m are the values in a region bounded by the points, A: (0.53, 0.27), B: (0.64, 0.27), C: (0.64, 0.35), D: (0.53, 0.45), E: (0.47, 0.45) and F: (0.47, 0.32) in the (x, m) coordinates shown in FIG. 2; 1.3≦x/yz≦1.8; and 9.5≦12z≦11.0.

The invention discloses a low-vibration noise performance fractional slot concentrated winding permanent magnet motor and a design method, and belongs to the field of rotating motors. On the basis ofa motor matched with an existing notched pole, and some stator additional teeth are correspondingly added (the specific number of the teeth is determined according to the matched notched pole of the motor). For a three-phase 18/16 motor, six additional teeth are added, the position of each stator notch is calculated, and the winding structure adopts a concentrated winding structure corresponding to the three-phase 18/16 motor. The rotor structure adopts the common surface-mounted structure, and radial magnetizing is adopted; the motor has the advantages that the stator structure is changed, the content of tooth harmonic waves in the winding magnetomotive force in an air gap is lowered, therefore, the motor vibration and noise are lowered, and meanwhile the rotating torque of the motor is ensured. In addition, due to changes of the stator structure, the content of subharmonic waves of the magnetomotive force in the air gap is lowered, and then eddy-current losses generated in the permanent magnet are lowered. Accordingly, the motor has the great significance in motor body designing.

The invention discloses super high strength magnet yoke steel. The super high strength magnet yoke steel comprises, by weight percentage, 0.10-0.15% of C, smaller than or equal to 0.15% of Si, 1.85-2.00% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.010% of S, 0.20-0.30% of Ti, 0.05-0.07% of Nb, 0.35-0.55% of Mo, 0.001-0.003% of B, 0.02-0.10% of Als, smaller than or equalto 0.010% of N and the balance Fe and inevitable impurities. According to the super high strength magnet yoke steel, in order to further improve strength and effectively break through the extreme strength 700 MPa of steel of a ferritic structure, in a structure reinforcing manner, by adding a proper amount of bainite to form elements, in cooperation with a super fast cooling process, a bainite structure is obtained, and the super high strength magnet yoke steel is obtained.

The invention relates to a magnetic leakage type mechanical variable flux permanent magnet synchronous motor. The magnetic leakage type mechanical variable flux permanent magnet synchronous motor consists of a motor body and a mechanical magnetism regulation device. A mechanical transmission manner is adopted to achieve the purpose that the working magnetic field of the motor can be regulated, and the magnetic leakage type mechanical variable flux permanent magnet synchronous motor is a mechanical magnetism regulation permanent magnet synchronous motor which is applied to the driving fields of electric vehicles or hybrid electric vehicles.

The invention belongs to the technical field of motors and discloses a motor stator iron core, a motor stator, a motor and a manufacturing method of the motor stator. The motor stator comprises the motor stator iron core. The motor comprises the motor stator and the motor stator iron core. According to the motor stator iron core, one end or two ends of an iron core body are provided with tooth boot boss portions, the purpose of increasing the axial length of the motor stator iron core can be achieved, and the turn length of a winding is not increased; besides, the flux of a magnet on a rotor can be guided to stator teeth through the tooth boot boss portions, the magnetism gathering effect is better, the flux density of the stator iron core can be improved, the material utilization rate is higher, and the weight of the motor stator iron core is reduced. Meanwhile, the turn length of the winding of the motor stator is reduced, the weight of the winding is reduced, the length of the end of the motor is reduced, and the motor is high in performance and low in cost.

The invention discloses a built-in high-power-density permanent magnet motor integrated to an 8AT transmission box. The built-in high-power-density permanent magnet motor comprises a transmission box flange, a transmission box housing, a built-in permanent magnet motor stator, a rotor and a transmission box hub, wherein the transmission box flange is connected to the left end of the transmission box housing; a back end cover of the transmission box housing is arranged at the right end of the transmission box flange; the motor stator is arranged on the inner wall of the transmission box housing; a flat wire forming winding is arranged on the motor stator; the rotor is arranged on the transmission box hub; rotor magnetic steel is arranged in the rotor; the flat wire forming winding is connected with a wire outlet box; a rotary transformer rotor is arranged on the transmission box hub; a rotary transformer stator is arranged on the back end cover of the transmission box housing; the rotary transformer stator is connected with the wire outlet box; each stator punching sheet adopts a structure that a stator yoke and stator teeth are separated first and then combined; the stator punching sheet is a closed slot without teeth harmonics; and the rotor adopts a V-shaped insertion type magnetic steel structure and a cosine air gap design, so that the magnetism gathering is remarkable. The built-in high-power-density permanent magnet motor is novel in structure, can generate vibration and is small in noise, small in loss and high in efficiency.

The invention discloses a magnetic material with a nitric oxide/photo-thermal synergic antibacterial function as well as a preparation method and an application of the magnetic material. The preparation method comprises the following steps: firstly, synthesizing Fe3O4 granules which are uniform in particle size and remarkable in magnetic effect by using a hydrothermal method; modifying the surfaceof Fe3O4 by a layer of poly-dopamine PDA with a remarkable photo-thermal effect; and finally by taking a great amount of amino groups on the surface of the poly-dopamine as initial points, enabling methyl acrylate and ethidene diamine to react alternatively to prepare a structure with ferroferric oxide as a core, poly-dopamine as a middle part and twig-shaped polyamide-amino Fe3O4@PDA@PAMAM as anoutermost layer, and further loading nitric oxide, thereby obtaining the magnetic material with the nitric oxide/photo-thermal synergic antibacterial function. By adopting the magnetic material, sterilization can be achieved by heat generated through near-infrared radiation, and rapid NO (Nitric Oxide) release is promoted, photo-thermal synergic sterilization is achieved, and furthermore bacteriaare rapidly separated through magnetic iron oxide, so that the sterilization and purification effect is further improved.

The invention discloses combined magnetizing permanent magnet built-in rotor of an axial magnetic field permanent magnet motor. The rotor structurally comprises two rotor discs installed on a rotatingshaft, the first rotor disc comprises a rotor iron core, permanent magnets, a rotor supporting shell and a rotor back yoke, the permanent magnets comprise the first permanent magnet and the second permanent magnet, and the rotor iron core comprises a rotor outer iron core and a rotor inner iron core; the rotor back yoke is installed on the rotor supporting shell, and the first permanent magnets and the second permanent magnets are alternately and evenly arranged on the rotor back yoke in the circumferential direction. The rotor core is fixed to the second permanent magnets arranged on the rotor back yoke together so as to keep the permanent magnets fixed in the radial direction and the axial direction; the rotor iron core, the permanent magnets, the rotor supporting shell and the rotor back yoke are fixed together to form the first rotor disc which is installed on the rotating shaft, and then the first rotor disc is connected with the second rotor disc through the rotating shaft to fix the position of the second rotor disc in the axial direction to form a double-rotor structure. The permanent magnet rotor is good in magnetism gathering effect, high in air gap flux density and large in reluctance torque.

The invention relates to the field of magnetic materials, in particular to an anisotropic flexible magnetic stripe suitable for magnetism health. The anisotropic flexible magnetic stripe is prepared through the following steps in sequence: preparation of gyromagnetic ferrite powder: pre-sintering a gyromagnetic ferrite blank by using microwaves, and smashing to obtain the gyromagnetic ferrite powder; pre-magnetization and microwave pelletizing: uniformly mixing rare earth compound permanent magnetic powder and the gyromagnetic ferrite powder treated by using anti-rust oil together with 4-15 parts of bonding agent, 1-5 parts of heat stabilizer, 0.5-2 parts of coupling agent and 0.2-0.8 part of antioxidant solution, pre-magnetizing, and performing microwave vacuum drying to form agglomerated magnetic particle clusters; performing primary calendering; magnetic field orientation: cutting a primarily-calendered flexible magnet into magnetic stripes, heating, preserving heat, and performing heat tracing magnetic field orientation; secondary calendering: performing secondary calendering on the magnetic field-orientated magnetic stripes at 30-40 DEG C. The prepared magnetic stripe is excellent in performance and higher in ageing resistance and corrosion resistance.

The invention discloses high-strength and high-toughness hot rolled magnetic yoke steel with the yield strength to be a 550MPa grade. The high-strength and high-toughness hot rolled magnetic yoke steel is prepared from the following components in percentage by weight: 0.01-0.03 percent of C, smaller than or equal to 0.15 percent of Si, 1.00-1.40 percent of Mn, smaller than or equal to 0.025 percent of P, smaller than or equal to 0.015 percent of S, 0.04-0.08 percent of Ti, 0.02-0.10 percent of Als and smaller than or equal to 0.010 percent of N. The high-strength and high-toughness hot rolled magnetic yoke steel is prepared through the following production steps: pouring after hot metal desulphurization, converter combined blowing and vacuum treatment; heating a slab; rough rolling; finish rolling; laminar cooling; and reeling. According to the high-strength and high-toughness hot rolled magnetic yoke steel disclosed by the invention, the yield strength is larger than or equal to 550MPa, the tensile strength is larger than or equal to 650MPa, the ductility A is larger than or equal to 15 percent, the impact energy KV2 at 20 DEG C below zero is larger than or equal to 100J, the magnetic induction performance B50 is larger than or equal to 1.50 T, and the demand of a large hydro-generator rotor magnetic yoke with high unit capacity for using the high-strength and high-toughness hot rolled magnetic yoke steel can be met.

The invention discloses a low-frequency compensation inertia type actuator and an actuation method thereof. The low-frequency compensation inertia type actuator comprises a stator component, an oscillator component and a low-frequency compensation component attached to the stator component. The stator component comprises magnetic conductive plates, permanent magnets and a shell body. The magnetic conductive plates and the permanent magnets are arranged on the inner wall of the shell body at intervals. The oscillator component comprises a first spring piece, a second spring piece, an actuation rod, a magnetic conductive barrel, a baffle, rubber rings and coils. The low-frequency compensation component with the frequency response characteristic opposite to the frequency response characteristic of the inertia type actuator comprises a low-frequency compensator and a power amplifier. The ladder-like magnetic conductive barrel is connected with the actuation rod in an interference fit mode. The multiple sections of adjacent reversed coils are wound on the outer side of the protruding part of the magnetic conductive barrel. The two rubber rings are installed on the outer side of the downwards concave part of the magnetic conductive barrel. The rubber rings and the baffle jointly clamp the coils on the magnetic conductive barrel.

The invention provides a novel double-moving-coil type loudspeaker which comprises a support, a lower clamping plate is fixed in the support, a vibration diaphragm is fixed on the support located on the lower clamping plate, two grooves are formed in the lower clamping plate, magnets are arranged in the two grooves respectively, washers are arranged on the upper surfaces of the magnets, gaps are formed between the side walls of the grooves and the washers, a large voice coil and a small voice coil are arranged in the gaps respectively, the vibration diaphragm covers the washers, and the upper end of the large voice coil and the upper end of the small voice coil are fixedly connected with the vibration diaphragm. The novel double-moving-coil type loudspeaker is characterized in that magnetic circuits of the large voice coil and the small voice coil are double inter magnetic circuits or double outer magnetic circuits in the lower clamping plate, a first vent hole is formed in the lower clamping plate, a second vent hole is formed in the support, and the first vent hole is communicated with the second vent hole for air leakage to enable the air pressure in the vibration diaphragm and the air pressure of the outside to be consistent. The novel double-moving-coil type loudspeaker effectively solves the distortion problem caused by compression of space in and out of the diaphragm, the sound quality effect is improved, and product quality is improved.

The invention discloses a drum-type distributed winding axial hybrid excitation motor. The motor comprises a stator disc and two rotor discs. The stator disc comprises a stator core, an armature winding, excitation windings and magnetic conductive rings. The rotor discs comprise rotor back yokes, magnetic conductive pole blocks and permanent magnets. Two axial end faces of the stator core are provided with a plurality of slots, and the number of the slots and slots positions on the two faces are at the same time. Two sides of a drum-type distributed armature winding coil are embedded and woundin two end face slots of the stator core, and a span is obtained by matching the number of pole slots. The excitation windings are installed on an inner ring or an outer ring of the armature windingor are installed on the inner ring and the outer ring simultaneously, and the magnetic conductive rings are correspondingly installed on inner rings or outer rings of the excitation windings. The rotor discs are arranged on two sides of the stator disc, and the number of rotor poles is matched with that of the stator slots. The permanent magnets and the magnetic conductive pole blocks are alternately installed on the rotor discs, and the two rotor discs are installed on a rotating shaft in a staggered mode by one pole. The drum-type distributed winding axial hybrid excitation motor has the advantages of high power density, wide magnetic field adjusting range and wide application prospect.