228results about How to "High flux density" patented technology

The invention relates to a multiphase long-stator primary permanent magnet linear motor which has the advantages of simple structure, firmness, stronger output thrust, higher power density and smaller thrust fluctuation. The motor comprises a stator (1), an air gap and rotors (2), wherein each rotor (2) comprises permanent magnets (3), a concentrated winding (4) and additional teeth (5); both the stator and the rotors are double-salient pole single-edges or double-edge flat-panel structures, and all concentrated winding coils of any phase are positioned in a rotor iron core slot; adjacent permanent magnets (3) form a serial magnetic circuit; the number of the permanent magnets (3) is NPM=2k*m+2, wherein k is a positive integer, and the number m of motor phases is not smaller than 3; both end parts of each rotor (2) are respectively provided with a permanent magnet which is an additional permanent magnet of each motor; the number of windings of the rotors is Nmt=(NPM-2)(m+1); and the central distance of adjacent teeth of the rotors is tau p.

The invention relate to an accelerator-driven subcritical transmutation reactor core adopting a dispersion metal fuel. The accelerator-driven subcritical transmutation reactor core sequentially comprises an external neutron source zone, a buffer zone, a fuel zone, an LBE (Lead-Bismuth Eutectic) reflecting layer zone, a stainless steel reflecting layer zone and a shielding layer zone from reactor core center to outside, wherein the fuel zone is divided into 2-4 zones from inside to outside; a plurality of fuel assemblies with the same structure, quantity and size are respectively loaded in each fuel zone; the fuel assemblies are composed of a plurality of triangularly-arranged fuel rods; the fuel rods are made from (TRU-10Zr)-Zr dispersion metal; and the Pu contents in the fuel rods of the fuel zones are sequentially increased from inside to outside. According to the invention, the fuel rods in the fuel zones are made from the (TRU-10Zr)-Zr dispersion metal, so that harder neutron spectrum is provided for the reactor core, the transmutation of minor actinides (MA) is benefited and the annual transmutation rate is up to about 15% and higher than the annual transmutation rate 10% of a Japanese scheme; and the fuel zone of the reactor core is divided, the Pu contents of the zones are at a certain proportion, the power peak density is low and the maximum value is not more than 450W / cm<3> under the condition that the safety is guaranteed.

The invention provides a soft magnetic thin strip which contains nanoscale fine grains and exhibits a high saturation magnetic flux density and excellent soft magnetic characteristics; a process for production of the same; magnetic parts; and an amorphous thin strip to be used in the production. In the invention, an amorphous thin strip is used, which is represented by the composition formula: Fe100-x-y-zAxMyXz-aPa (wherein A is at least one element selected from between Cu and Au; M is at least one element selected from among Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W and Mn; X is at least one elementselected from between B and Si; and x, y, z and a (in terms of atomic percentage) satisfy the relationships: 0.5<=x<=1.5, 0<=y<=2.5, 10<=z<=23, and 0.35<=a<=10 respectively) and permits 180 DEG bending. The amorphous thin strip can give through heat treatment a soft magnetic thin strip having a structure wherein grains of body-centered cubic structure having an average grain size of 60nm or beloware distributed in an amorphous phase with a grain volume fraction of 30% or above.

The invention discloses a modular primary permanent magnetic linear motor and a motor module consisting of the modular primary permanent magnetic linear motor. The modular primary permanent magnetic linear motor comprises a primary and a secondary, wherein the primary comprises m or 2m primary modules; each primary module comprises two U-shaped magneto-conducting materials and a permanent magnet between the U-shaped magneto-conducting materials; and taum, taus, tauul, tauu, wmt and wst satisfy the following relational expressions that tm is equal to or approximate to ktaus, tauul is equal to or approximate to (j+0.5) taus, tauul is equal to taum-tauul, and wmt is less than or equal to wst. Relative displacement between two primary modules which belong to the same phase is lambda1 which is equal to (n+ / -0.5)taus or lambda1 which is equal to ntaus, and relative displacement between two primary modules which belong to different phases is lambda2 which is equal to (i+ / -1 / m)taus or lambda2 which is equal to [i+ / -(0.5-1 / m)]taus. The motor and the motor module have the advantages of symmetric counter potential, relatively low sine and positioning force, small thrust ripple and the like, and are applied to the places where a long secondary structure linear motor is applied.

The invention relates to a permanent magnet coupling for the synchronous transmission of torque, comprising a first member (1) having permanent magnets (4a, 4b) and a second member (2), the members being designed as inner rotor and outer rotors and separated by an air gap (3) extending between the members (1, 2), wherein the members (1, 2) are coupled to enable a synchronous movement by forces generated by the permanent magnets (4a, 4b) by the interaction with the second member (2), wherein the first member (1) comprises a first group of permanent magnets (4a) having magnetizing directions parallel to the air gap (3) and a second group of permanent magnets (4b) having magnetizing directions perpendicular to the air gap (3), wherein the permanent magnets (4a, 4b) of the first group and of the second group of the first member (1) are alternately arranged in the circumferential direction, and wherein, as viewed in the circumferential direction, the consecutive permanent magnets (4a) of the first group and the consecutive permanent magnets (4b) of the second group have opposing magnetizing directions, respectively. According to the invention, the permanent magnets (4b) of the second group, starting from the air gap (3), are arranged offset toward the back with respect to the permanent magnet (4a) of the first group such that permanent magnet-free intermediate spaces (5), in particular made of soft iron, remain between the air gap (3) and the permanent magnet (4b) of the second group, said intermediate spaces being delimited laterally by the permanent magnets (4a) of the first group.

The invention discloses a modular complementary type primary permanent magnet linear motor and a motor module formed thereby. The primary permanent magnet linear motor comprises a primary level and a secondary level; the primary level and the secondary level are respectively in a salient-pole structure, and an air gap is formed between the two levels; the primary level comprises a rotor module which comprises a first module and a second module; a first non-magnetic material is arranged between the first module and the second module; the first module and the second module both comprise two salient-pole magnetic materials and a permanent magnet arranged between the two salient-pole magnetic materials; the salient-pole magnetic material is provided with m numbered primary teeth, and a central armature winding is arranged on the primary teeth; the relative displacement between the first module and the second module is calculated as follows: lambda2=(k+ / -0.5) tau s; the relative displacement between the adjacent two salient-pole magnetic materials is calculated as follows: lambda1=m*tau m; and the ratio of the primary polar distance to the secondary polar distance is as follows: tau m: tau s=(m+ / -1):m. The invention has the advantages of symmetric back electromotive force, relatively small positioning force, low thrust fluctuation and the like and is applicable to the application occasion of a linear motor with a long-stator structure.

The invention discloses a double-layer permanent magnet type axial eddy current recoil and counter-recoil device. The double-layer permanent magnet type axial eddy current recoil and counter-recoil device comprises a supporting mechanism, an eddy current damping mechanism and a counter-recoil mechanism. The eddy current damping mechanism comprises an inner-layer permanent magnet, an outer-layer permanent magnet and an outer-layer magnetic conductive block. Each of the inner-layer permanent magnet and the outer-layer permanent magnet is of an annular cylinder structure. The inner diameter of the outer-layer permanent magnet is larger than the outer diameter of the inner-layer permanent magnet, and the inner-layer permanent magnet and the outer-layer permanent magnet are coaxially arranged. The supporting mechanism provides supporting and moving guidance for the counter-recoil mechanism. A round pipe of the counter-recoil mechanism is located between the inner-layer permanent magnet and the outer-layer permanent magnet and moves relative to the inner-layer permanent magnet and the outer-layer permanent magnet. The device is high in damping coefficient, the suffered impact loads during work of a transmitting device can be buffered, the recoil displacement and the counter-recoil speed of the transmitting device can be effectively reduced, and the counter-recoil function is achieved.

The invention discloses a preparation method for a permanent ferrite magnetic shoe containing a rare earth material and an organic material, and a product. The preparation method comprises the following steps of: treating an iron scale; grinding; oxidizing; primary dosing; mixing; preburning and palletizing; rough grinding; secondary dosing; ultra-fine grinding; slurry precipitation; pressing blanks; sintering; grinding; and warehousing. The preparation method of the invention has the characteristics that: the magnetic orientation degree of crystal grains is improved by adding calcium gluconate and improving a grinding method; and magnetic performance and magnetic characteristics thereof are improved by displacing the components of a conventional strontium ferrite permanent magnet material by adopting an additive mode of secondary dosing. The rare earth permanent ferrite magnetic shoe obtained by the preparation method has the characteristics of high residual magnetic flux density, high intrinsic coercive force and low intrinsic coercive force temperature coefficient.

The invention discloses a contactless on-load automatic positive and negative voltage regulating tap switch device for a three-phase distribution transformer and relates to the technical field of electric engineering. The problems that the contactless on-load voltage regulating range is small and power supply reliability is poor due to the fact that an existing power electronic element is low in voltage resistance can be solved. An antiparallel thyristor is used as a switching tap switch device, on-load voltage regulation is carried out in a positive and negative voltage regulation mode, a low-voltage air switch is used as a circulating current protecting device, and on-off of the tap switch is controlled through a monitoring and control system and a trigger unit. When the tap switch breaks down, an air switch trips out, a fault current is cut off, meanwhile, a power source of an isolation transformer is cut off, the on-load voltage regulating function exits, and the distribution transformer is automatically recovered to a rated tap to continue to supply power to a user; meanwhile, a fault alarm unit automatically sends a short message to a transformer manager through a mobile communication network to inform the transformer manager that the on-load automatic positive and negative voltage regulating tap switch is in the abnormal operation stage, and therefore fault removal is carried out at the right moment. The contactless on-load automatic positive and negative voltage regulating tap switch device is used for a power distribution system.

An electromagnetic contactor includes a first stationary contact 5A having a stationary contact portion and a stationary terminal portion for connecting to a power supply; a second stationary contact 5B having a stationary contact portion and a stationary terminal section for connecting to a load; a stationary-contact supporting case 4 supporting the stationary terminal portions of the first and second stationary contacts to protrude the contact support casing, and maintaining a predetermined distance in between; a moving-contact portion contactable to and separable from the stationary contact portion of the first and second stationary contact and arranged in the stationary-contact supporting case; and a pair of arc-extinguishing magnets 21, 22 arranged in parallel to sandwich the moving-contact portion in the longitudinal direction and having same magnetic polarity at opposing magnetic pole surfaces. A driving mechanism 3 drives the moving-contact portion contactable to and separable from the stationary contact portions of the first and second stationary contacts.

The invention discloses a single-phase reluctance generator which comprises a stator and a rotor in projecting magnetic pole structures by stacking silicon-steel sheets. Stator magnetic poles are provided with concentrated armature windings which are connected in series or parallel into a group according to the N polarity and the S polarity of the armature windings; rotary magnetic poles arranged on the rotor has the same number as the magnetic pole number of the stator and comprise winding excitation magnetic poles or permanent-magnet magnetic poles and permanent-magnet excitation mixed magnetic poles; magnetic pole windings adjacent to the rotor are connected in series or parallel to form a plurality of N groups and S groups; and the stator poles and the rotor poles consist of 2-stage poles, 4-stage poles, or even n-stage poles, namely even poles or pair poles, respectively comprise different stage poles and have the same total pair poles. The invention adopts a stator isopolar technology so that the rotor can adopt different modes, such as the excitation magnetic poles, the permanent-magnet magnetic poles and the mixed magnetic poles of the permanent-magnet magnetic poles and the electric excitation magnetic poles, and the stator windings can be simultaneously utilized; the dynamic combination of the windings connected in series or parallel facilitates the adjustment of an output voltage, improves the utilization rate of the windings, enhances the power density of the generator and improves the performance and the efficiency of the generator.

The invention discloses a driving device of a high temperature super-conducting linear motor for rail transit, comprising a controllable variable-frequency power supply and a high temperature super-conducting linear motor; a primary iron core (4) of the high temperature super-conducting linear motor is composed of amorphous alloy slices or of non-magnetic materials directly; a high temperature super-conducting winding is connected with a controllable variable-frequency power supply (13); an air gap (6) is arranged between the bottom plane of the primary iron core and the upper surface of a secondary conductor plate (2); the high temperature super-conducting winding (3) adopts cake structure and a runway section; the winding is arranged in layers and is fixed in the groove of the primary iron core; a primary component is composed of the high temperature super-conducting winding (3) and the primary iron core (4), and is arranged in a cryogenic vessel (9) and fixed on a bogie (5); the secondary conductor plate and a secondary magnetic conductive steel plate (7) are fixed on the sleeper between the two rails. The driving device has the advantages of small volume, light weight, little energy loss and greatly increased reliability and prolonged service life; the driving device can be widely applied to trains, subways, urban metros, etc.

The invention relates to a double-equal pole double-section stator / rotor reluctance generator, comprising two sections of stators and rotors of a salient pole structure or a non-salient-pole structure formed by laminating silicon-steel plates. A stator salient pole is provided with armature concentrated windings or layer windings; the windings are connected in series or in parallel according to the N-N polarity of the armature windings to form a phase, and the windings are connected in series or in parallel according to the S-S polarity of the armature windings to form the other phase; the rotors are equipped with rotating magnetic poles with the same pole number with the stators, and the adjacent pole windings of the rotors are connected in series or in parallel to form a plurality of N and S groups; the rotors can adopt excitation magnetic poles and permanent magnetic poles in different forms and permanent magnetic and electro-magnetic mixed poles, and a rotor excitation device is arranged on a motor shaft; each rotor can be divided into an inner rotor and an outer rotor; and the armature windings can be arranged on the stators or the rotors. In the invention, by adopting an equal-pole-number stator / rotor technology and series / parallel connection dynamic combination of the windings, output voltage can be regulated conveniently, the utilization ratio of the windings is improved, and power density and efficiency of the generator are enhanced.

The invention discloses a neodymium-iron-boron magnet and a preparation method thereof. The neodymium-iron-boron magnet consists of a neodymium-iron-boron matrix alloy and doped components, wherein the doped components are tin and aluminum nano particles; the doping amount of the tin nano particles accounts for 0.02-1.0 percent of the weight of the neodymium-iron-boron matrix alloy, and the doping amount of the aluminum nano particles accounts for 0.03-3.0 percent of the weight of the neodymium-iron-boron matrix alloy. The invention also discloses a preparation method of the neodymium-iron-boron magnet. Compared with the conventional neodymium-iron-boron magnet, the internal grasping coercive force of the neodymium-iron-boron magnet disclosed by the invention is improved by 8-20 percent, and the working temperature is increased by 30-50 DEG C; under the condition of the same performance, the content of heavy rare earth and the content of strategic metal cobalt are reduced, and the production cost is saved.

A modular multilayer disc type motor based on an effective magnetic domain technology is composed of multiple kinetic energy converting units which are sequentially and axially aligned and superposed, wherein each kinetic energy converting unit is formed by disk rotors and contiguous disk rotor windings of multiple permanent magnets fixed on one disk face, and permanent magnet bodies on the rotors are identical in shape and axially aligned. At least two groups of kinetic energy converting units are installed within an axial distance of the length. The length is 12-14 times of the thickness of the permanent magnet bodies. Structural basic parameters of the disc type motor are confirmed. The using efficiency of the disc type motor in a structural parameter range is at least 20% higher than that of a column type motor.

The invention discloses a rotary magnetotherapy device, which comprises a rotary mechanism, a support plate driven by the rotary mechanism and a magnetic body group arranged on the support plate. The magnetic body group comprises a central magnetic body, a first magnetic body and a second magnetic body, the central magnetic body is arranged in the middle of the support plate, magnetic poles of the central magnetic body are arranged in the horizontal direction, the first magnetic body and the second magnetic body are arranged on the two sides of the central magnetic body, magnetic poles of the first magnetic body and the second are inclined inwards along the vertical direction and have opposite polarities, and the magnetic poles at the two ends of the central magnetic body are the same as the magnetic poles of the adjacent upper ends of the first magnetic body and the second magnetic body. Therefore, since the first magnetic body and the second magnetic body are inclined inwards along the vertical direction, the flux density through a human body in the horizontal direction is increased. Since the magnetic poles of the central magnetic body are arranged in the horizontal direction, the horizontal main-loop magnetic field and vertical parallel magnetic fields are produced through the human body, the magnetic field uniformity on the working surface is enhanced, and three-dimensional distribution of magnetic lines of force is achieved.

The invention discloses a bilateral Halbach consequent pole type permanent magnet vernier motor. The motor comprises an outer stator, a rotor and an inner stator, the outer stator comprises an outer stator iron core, outer stator grooves and outer stator teeth are uniformly distributed in the outer stator iron core at intervals in the circumferential direction, outer stator armature windings are embedded in the outer stator grooves, and the end part of each outer stator teeth is split into two outer modulation poles; the rotor comprises a rotor core, inner rotor grooves and outer rotor groovesare formed in the inner side and the outer side of the rotor core in the circumferential direction at intervals, the inner rotor grooves and the outer rotor grooves are arranged in a staggered mode,and rotor inner side Halbach permanent magnets and rotor outer side Halbach permanent magnets are embedded into the inner rotor grooves and the outer rotor grooves respectively; and the inner stator comprises an inner stator iron core, the inner stator grooves and the inner stator teeth are evenly distributed in the outer circumferential direction of the inner stator iron core at intervals, the end of each inner stator teeth are split into two inner modulation poles, and the inner stator armature windings are embedded in the inner stator grooves. The bilateral Halbach consequent pole type permanent magnet vernier motor is low in speed, large in torque, small in cogging torque, small in torque pulsation and small in permanent magnet consumption.

Magnetic powder included in a resin composition (6) to be used for injection molding is covered with an insulating material, and a green compact magnetic body (2) or a powder magnet molding (22) is inserted into the resin composition (6).

The invention discloses a breaker electric operating device which comprises a shifting block and an electric operating device body. The electric operating device body comprises a stator and a coil rotor. The stator comprises a magnet yoke and permanent magnets which are symmetrically arranged on the two end faces in the magnet yoke in a Halbach array. The coil rotor is arranged in the stator. The coil rotor and the stator form a sliding pair. The coil rotor is limited at the two ends of the stator in the sliding direction. The end, extending out of the stator, of the coil rotor can shift the shifting block in the sliding direction of the coil rotor. Coils are arranged in the coil rotor at intervals. Three or three-multiple coils form coil windings. The coil windings are connected in parallel. Hall sensors are arranged at continuous coil gaps in the coil rotor. According to the breaker electric operating device, on the condition that the original structure of a molded case circuit breaker is not changed, the breaker electric operating device can achieve remote control over the breaker, is simple in structure, reliable in operation, quick in response, large in driving force and low in impact, does not produce extra pushing resistance when an electric operating mechanism does not work, and reserves the manual operation function.

The invention discloses an array type micro electromagnetic type broadband vibration energy collector which comprises an insulating substrate, a planar spiral induction coil, vibration pick-up structural units and fixed permanent magnets. Each vibration pick-up structural unit comprises a vibration permanent magnet and a vibration structure, the planar spiral induction coil and a supporting structure are arranged on the insulating substrate, the planar spiral induction coil is internally provided with the vibration pick-up structural units which are arranged in an array mode, each vibration permanent magnet is provided with an independent vibration structure, the periphery of each vibration pick-up structural unit is provided with the corresponding fixed permanent magnet for increasing magnetic flux density, the fixed permanent magnets increase the magnetic flux density, and the output power of the collector is increased; all the vibration permanent magnets vibrate independently, meanwhile the maximum amplitude can be achieved, and broadband vibration can be achieved; the coil radius is increased due to the fact that the same planar spiral induction coil is shared, the number of turns of an inner coil is reduced, the quality factor is effectively increased, and energy conversion efficiency is improved.

The invention discloses a loudspeaker, relates to the technical field of terminal devices and solves the problem of a poor loudspeaking effect caused by an insufficient sound pressure level in a light and thin terminal device. The loudspeaker comprises a diaphragm and a magnetic circuit system. The magnetic circuit system comprises a first magnet and a second magnet which are arranged in a sleeving manner, an interval exists between the first magnet and the second magnet, and annular magnetic steel is arranged in the interval. A first sound coil is arranged in a first interval formed between annular magnetic steel and the first magnet, a second sound coil is arranged in a second interval formed between the annular magnetic steel and the second magnet, the first sound coil and the second sound coil generate Ampere forces in the same direction to drive the diaphragm to vibrate. The loudspeaker provided by the invention is used in the technical field of terminal devices.

The invention relates to a micro radiating fan device, mainly consisting of a main body, a rotating shaft, at least one planar coil, at least one permanent magnetic magnet, a plurality of blades and at least one magnetic conductive back iron, wherein, the rotating shaft is pivotally arranged on the main body; the planar coil is arranged in the main body and adopts the way of wave winding; the permanent magnetic magnet is connected with the rotating shaft, is roughly parallel to the planar coil and can produce a staggered and multi-polar magnetic field; a plurality of blades are arranged on the centrifugal blades of the permanent magnetic magnet around the core of the rotating shaft, form an integral body with the permanent magnetic magnet and can synchronously rotate with the permanent magnetic magnet; the magnetic conductive back iron is arranged on one side of the planar coil and has a geometric shape corresponding to the wave forms of the planar coil; in addition, the planar coil is provided with at least one permeable part inside which a hall inductor is arranged; by adopting the structure, the micro radiating fan device achieves the purposes of being thinner, improving convection efficiency and increasing flux density, etc.

The invention discloses a novel high-density wireless energy transmission coil structure, wherein a transmitting coil is formed by connecting the dotted terminals of a plurality of strongly coupled small coils in parallel by a unidirectional-rotation winding mode, wherein a receiving coil is formed by serially connecting the dotted terminals of a plurality of coupled small coils by a counter-rotation winding mod, and the resonant frequency of the small coils forming the receiving coil and the resonant frequency of the small coils forming the transmitting coil are consistent. The transmitting coil of the structure is formed by two strong coupled small coils which are connected in parallel, the mutual inductance coefficient between each other is larger, close to 1, the flux density of the transmitting coil is greatly enhanced, and a foundation is laid for high-efficiency energy transmission. The inductance value of the two small coils constituting the receiving coil is much larger than the sum of the inductance values of two individual coils, thereby greatly increasing the transmission efficiency. The structure increases the transmission distance and power density of the coupling mechanism under the premise of ensuring the space required for transmission and reception at both ends, the safety distance and the required electric energy.

The invention relates to a clutch device (102) having an actuating device (204), especially for a drive train (100) of a motor vehicle which comprises an internal combustion engine (104), an electrical machine (108) with a stator (118) and a rotor (120), and a transmission device (110). The clutch device (102, 202) can be arranged in the drive train (100) between the internal combustion engine (104) on the one side and the electrical machine (108) and the transmission device (110) on the other side. The clutch device (102, 202) and the actuating device (204) are integrated into the rotor (120) of the electrical machine (108) and the actuating device (204) comprises an electrical eddy-current brake (244) with a brake stator (246, 302) and a brake rotor (248), the brake rotor (246, 302) having at least one electromagnet (250, 306) with a coil and a core, said coil and said core being arranged concentrically in relation to each other.

The motor includes the stator and the rotor. The magnetic poles of permanent magnetism are fixed on the yokes of the rotor. There is the radial air gap between the stator and the rotor. The largest thickness of the cross section in the magnetic poles of permanent magnetism is in the center and the thickness is symmetrically reduced towards two sides gradually. The invention makes the motor possess the effect of accumulating magnetism, improve the waveform of the magnetic field and reduce the change of the magnetic reluctance so as to increase the flux density between the stator and the rotor, and the production outupt as well as reduce the torque fluctuation. The invented motor features smooth and quiet operation, small scale and lightweighting.

This invention discloses a method to increase the super quanta intervene part accuracy, which puts layer of magnetic medium into the coupled structure of magnetic flux conversion device and SQUID to increase its magnetic flux density accuracy. Comparing with the current same area SOUID, the outer magnetic field changes one magnetic flux quanta responds to smaller field changes, which is equivalent to increase the effective area of the SQUID.

The invention relates to an iron-based amorphous soft magnetic alloy, which is composed of FeaSibBcPdCue and trace unavoidable impurities, in which a is 83.2-83.6, b is 2.3-2.5, c is 12.2-12.3, and d is 1.2 ~1.5, e is 0.6~0.7, a+b+c+d+e=100, it has high saturation magnetic induction, low coercive force, high magnetic permeability and excellent corrosion resistance, and it has It has the characteristics of good formability, low production cost and simple process; the saturation magnetic induction intensity of the alloy can reach 1.81T-1.83T after stress relief annealing.

The invention relates to a wear-resisting neodymium-iron-boron permanent magnet material and a preparation method thereof. The wear-resisting neodymium-iron-boron permanent magnet material comprises a neodymium-iron-boron base body, wherein the neodymium-iron-boron base body comprises the following components in atom mass percentage of 25-26.5% of neodymium, 0.5-1% of cobalt, 1-1.5% of silicon, 2-2.5% of manganese, 10-10.5% of boron and residual amount of iron. The following components are further added into the neodymium-iron-boron permanent magnet material according to the weight percentage of the neodymium-iron-boron base body: 0.1-0.3% of dysprosium-iron alloy, 0.3-0.5% of samarium-iron alloy and 1.5-2.5% of yttrium-iron alloy.

It is an object to provide a small-sized optical isolator that is suitable as an optical isolator used in a semiconductor laser used in applications such as medical treatment or optical measurement The optical isolator for a wavelength band of 320 to 633 nm of the present invention comprises a Faraday device having a Verdet constant at a wavelength of 405 nm of at least 0.70 min / (Oe·cm), and a first hollow magnet disposed on the outer periphery of the Faraday device and second and third hollow magnet units disposed so as to sandwich the first hollow magnet on the optical axis, the second and third hollow magnet units comprising 2 or more magnets equally divided in a direction of 90 degrees relative to the optical axis, the Faraday device having applied thereto a magnetic flux density B (Oe) within the range of Expression (1) below, and a sample length L (cm) on which the Faraday device is disposed being within the range of Expression (2) below. 0.8 × 10 4 ‰¤ B ‰¤ 1.5 × 10 4 0.25 ‰¤ L ‰¤ 0.45

The invention discloses a parallel type mixing-magnetic-material-based composite-rotor-contained magnetic flux switching motor. A non-magnetic-conductive rotating shaft, an inner rotor, a stator, and an outer rotor are installed successively and concentrically from inside to outside at a radial direction in a sleeving mode. The stator contains stator iron cores, mixed permanent magnet modules and three-phase armature windings; the three-phase armature windings are arranged between the adjacent stator iron cores; one mixed permanent magnet module is embedded into the middle of each stator iron core tightly and fixedly; and each mixed permanent magnet module is formed by seamless connection of an internal neodymium iron boron permanent magnet, a ferrite permanent magnet, and an external neodymium iron boron permanent magnet from inside to outside along the radial direction. On the basis of the stator-free yoke-type structural design, obvious series magnetic circuits of the adjacent permanent magnets are formed on the magnetic flux paths by combining the composite rotor, thereby avoiding a phenomenon of supersaturation of the stator tooth part and effectively improving the utilization rate of the permanent magnet. The stator tooth employs a non-equal-arc design, so that the total positioning moment on the composite rotor is reduced and thus an effect of reduction of torque pulsation is realized.