138 results about "Magnetic modulation" patented technology

The present invention relates to modulated (e.g., magnetically modulated) chemical sensors. In particular, the present invention relates to particles comprising fluorescent indicator dyes and methods of using such particles. Magnetic fields and / or Brownian motion modulate an optical property of the particle to distinguish it from background signals. The present invention thus provides improved methods of detecting a wide variety of analytes in fluids, fluid samples, cells and tissues.

The invention provides a birotor permanent magnet motor and a washing machine with the same. The birotor permanent magnet motor comprises an inner rotor, a stator and an outer rotator which are sequentially arranged from inside to outside, and is characterized in that both the inner rotor and the outer rotor are permanent magnet rotors, and the stator comprises a magnetic modulation ring and a stator winding arranged on the magnetic modulation ring in a wound mode. The birotor permanent magnet motor is based on the magnetic field modulation principle and has a birotor structure, the outer rotor and the inner rotor can rotate according to certain proportional relation, and high-performance output of the motor under operating conditions of a low speed and a high speed can be met at the same time. When the birotor permanent magnet motor drives the washing machine to operate, not only are design requirements for low-speed large torque output and high-speed small torque output of the motor under the optimal operating state met, but also the structures of a belt pulley, a reduction gearbox and the like in a traditional washing machine are eliminated, transmission efficiency of the motor is improved, and meanwhile the defects of high noise, machine body vibration and the like of the traditional washing machine are overcome.

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 magnetic modulation motor includes an armature, a magnetic induction rotor, and a magnet rotor. The armature is provided with a multi-phase winding with m pole pairs. The magnetic induction rotor includes k magnetic paths. In the magnet rotor, 2n permanent magnets forming a polarity region with n pole pairs are separately and annularly placed. The armature, the magnet rotor, and the magnetic induction rotor are arranged in the order from a radially outer side to a radially inner side. In the magnetic induction rotor, the magnetic path has two ends projecting toward a magnetic flux entry and exit located at an outer diameter face of the magnetic induction rotor, and forms a magnetic flux path between the magnetic flux entry and exit. The magnet rotor includes magnetic flux penetration region magnetically penetrated by magnetic flux between each circumferentially adjacent two permanent magnets.

A magnetic field sensor comprises a magnetoresistive element (10) biased with a current (i) in order to measure an external magnetic field (Hext). A magnetic modulation field (Hm) is applied to a sensitive region of said sensor and the sensor comprises a synchronous detection device (14) for measuring the amplitude of an odd harmonic of the output signal.

A biosensor utilizing bio-functionalized magnetic nanoparticles is provided. An external magnetic field is applied to a suspension of magnetic nanoparticles. A linearly polarized incident light is applied to the suspension of magnetic nanoparticles. A photocurrent from polarized light scattering by bio-functionalized magnetic nanoparticles in liquid is detected. The magneto-optic sensing technique is applied to a micro-fluidic channel for rapid and sensitive detection with a small sample amount, and subsequent magnetic separation for detoxification. This technique is used for the detection of Brownian relaxation with time sweep as well as frequency sweep. The magneto-optical sensor enables rapidly detecting changes in local dynamic properties of the magnetic nanoparticles in liquids and magnetic modulation of ferromagnetic particles in liquid provides increased signal sensitivity.

The invention relates to a magnetism transmission gear pair of a novel transverse magnetic field, which can be widely applied to wind power generation, electric cars, ship drive and other industrial transmission fields requiring direct drive. The magnetism transmission gear pair is characterized in that a driving wheel and a driven wheel of the magnetism transmission gear pair are of a flat disk shape, 2pr driving wheel permanent magnets 3 are distributed on the driving wheel, and 2ps driven wheel permanent magnets 7 are distributed on the driven wheel; a ferromagnetic magnetic modulation grid 6 playing a role of modulating an air-gap magnetic field is arranged between the driving wheel and the driven wheel, air gaps are reserved between the ferromagnetic magnetic modulation grid 6 and the end surfaces of the driving wheel and the driven wheel, and the ferromagnetic magnetic modulation grid 6, the driving wheel and the driven wheel have no mechanical contact and are distributed along the same axis; the air-gap magnetic field Bg passes through an air-gap plane along a route parallel to a rotation axis to form a transverse magnetic field of the magnetism transmission gear pair; and during working, power speed change transmission without mechanical contact and friction is realized by utilizing a principle of heteropolarity attraction of an N pole and an S pole of a permanent magnet material.

A sensor for remote detection of objects in a surveillance zone (10) is preferably intended to be used in an article surveillance zone, which further has at least one transmitter means (11, 13) and at least one receiver means (12, 15) for transmitting and receiving, respectively, electromagnetic radio-frequency signals in the surveillance zone, and at least one modulating means (16) for generating a modulation field in the surveillance zone. The sensor is arranged to transmit an electromagnetic reply signal at the reception of electromagnetic energy from the transmitter means, said reply signal being dependent on the modulation field and being receivable by the receiver means. A magnetic element (23) is arranged in a sensor body (21; 101, 102), the magnetic properties of the element being controllable by a magnetic field acting as the modulation field, wherein the amplitude of the reply signal from the sensor is controllable through the magnetic modulation field.

The invention relates to a low-speed high-thrust-density linear motor which comprises a motor short primary and a motor long secondary arranged opposite to the motor short primary, wherein an air gap (5) is reserved between the motor short primary and the motor long secondary; the motor short primary comprises a stator core (1), stator teeth (3) uniformly distributed at the periphery of the stator core (1), a stator winding (2) and stator permanent magnets (4); the stator core (1) is of an open slot stator structure, i.e., the stator core (1) is provided with a stator slot (8), the stator permanent magnets (4) are uniformly distributed between every two adjacent stator teeth (3), and the stator winding (2) is inserted into the stator slot (8); the motor long secondary comprises an active cell yoke (7) and active cell permanent magnets (6); and the active cell permanent magnets (6) are embedded into the active cell yoke (7) alternately and equidistantly in a horizontal direction. In the low-speed high-thrust-density linear motor provided by the invention, the magnetic modulation rings in a magnetic gear are replaced by the stator teeth, thereby simplifying the machining process, improving the reliability of the device and reducing the system manufacturing cost.

The invention discloses a parallel-serial magnetic path memory motor. The parallel-serial magnetic path memory motor comprises a hybrid permanent-magnet rotor, a stator, an armature winding and a rotation shaft, wherein the armature winding is arranged on the stator, the stator is arranged outside the hybrid permanent-magnet rotor, the hybrid permanent-magnet rotor comprises a rotor core, first permanent magnets, second permanent magnets, third permanent magnets and triangular magnetic obstacles, the first permanent magnets are arranged at the rotor core in a straight-line shape, the triangular magnetic obstacle is arranged between two of the first permanent magnets, the second permanent magnets and the third permanent magnets form V-shaped hybrid permanent magnets, the V-shaped hybrid permanent magnets are symmetrically arranged at two sides of the triangular magnetic obstacles, and the first permanent magnets and the second permanent magnets form series magnetic paths. By the parallel-serial magnetic path memory motor, the problems of narrow series-type magnetic modulation range and demagnetization seriousness by parallel cross coupling in a traditional built-in permanent-magnetmemory motor can be solved, the motor torque density is improved, and the full-working condition running range of the motor can be expanded.

The invention provides a measuring method and a device of pulse width detection type magnetic modulation direct current, comprising a magnetic modulation circuit, a magnetic sensor, a pulse width measuring and magnetic characteristic modifying circuit and a method, and the size and direction of the direct current to be measured are reflected through the variation of the pulse width of the pulse generated by measuring the magnetic modulation circuit. The working frequency of the adopted magnetic modulation signal is far higher than the power frequency, thus the interference of power frequency is avoided; the outside of the magnetic sensor is provided with a magnetic shielding case, which can effectively lower the influence of earth magnetic field and external interference magnetic field on the test, and magnetic characteristic modification measures are adopted. The method and device possess higher sensitivity, stronger capability of resisting interference, can effectively reduce the influence of magnetic material nonlinearity, and improve test precision and stability.

The invention discloses a magnetic flux controllable memory motor online magnetic modulation performance prediction and optimization design method based on a nonlinear equivalent variable magnetic network model. The method includes: (1) setting material characteristics of each part of the motor; (2) establishing a nonlinear equivalent variable magnetic network model; (3) carrying out simulation calculation on the adjustable magnetic material; (4) optimizing motor structure parameters by combining a multi-objective genetic algorithm based on NSGA II with a nonlinear variable magnetic network; (5) changing the magnitude of excitation current, and obtaining an initial feasible non-dominated solution set; and (6) changing the magnitude of the excitation current, and reducing the range of the non-dominated solution set, so that the non-dominated solution set gradually approaches the optimal solution set suitable for multi-mode operation of the memory motor, wherein the target function of all parameter combinations in the preliminary feasible non-dominated solution set is solved again; And finally, obtaining an optimal parameter combination in the parameter set at the front edge of the optimal solution set, and determining the motor structure.

The invention provides a magnetic gear-type composite hub motor. The magnetic gear-type composite hub motor comprises a motor mandrel, an inner stator, a high-speed inner rotor, a magnetic modulation ring, and a low-speed outer rotor, wherein the inner stator, the inner rotor, the magnetic modulation ring, and the outer rotor are arranged around the motor mandrel in sequence, and are sequentially nested along the radial direction of the motor mandrel; the inner stator is fixed in the motor mandrel; the inner rotor is supported by an inner rotor support assembly and can rotate around the motor mandrel; the inner rotor support assembly is arranged on both sides of the inner rotor along the axial direction of the motor mandrel; the magnetic modulation ring is fixed on the motor mandrel through a magnetic modulation ring fixing panel; the magnetic modulation ring fixing panel is arranged on both sides of the magnetic modulation ring along the axial direction of the motor mandrel; the outer rotor is supported by an outer rotor support assembly and can rotate around the motor mandrel; the outer rotor support assembly is arranged on both sides of the outer rotor along the axial direction of the motor mandrel. The magnetic gear-type composite hub motor provided by the invention has high structural strength and rigidity, large rotation accuracy and output torque, is compact in structure, high in efficiency, small in vibration, and is suitable for direct-driven hub motor.

A magnetic flux modulation dual-stator dual-electric port motor, including coaxially arranged and independent of each other: a first stator, a second stator, a freely rotatable magnetic modulation ring connected to a driving component for torque transmission, the first stator There is an air gap between the first stator and the second stator, and the magnetic modulation ring is set in the air gap between the first stator and the second stator or sleeved on the outside of the first stator and the second stator so that the first stator and the second stator The magnetic field generated by the two stators is modulated. The first stator is equipped with the first stator winding with the number of pole pairs P1, and the second stator is equipped with the second stator winding with the number of pole pairs P2. The magnetic modulation ring includes N magnetic permeable blocks arranged at intervals, and P1+P2=N, P1, P2, and N are positive integers. The magnetic flux of the present invention converges into the air gap between the stator and the magnetic modulation ring, which can improve the torque transmission capacity and transmission efficiency, and in the case of P1+P2=N, can realize the maximum torque transmission capacity, two sets of independent Stator windings allow flexible four-quadrant control.

A current detection method and device based on magnetic modulation technology is disclosed. An excitation winding with a closed magnetic medium acts as a modulator at a sensing end to modulate a current to be detected on at least one current-carrying conductor to be detected to a periodic carrier signal, a digital domain signal is obtained through analog-digital conversion at a detection end, andthen a characteristic value representing the current information on the current-carrying conductor to be detected is obtained through dimension reduction processing, wherein: the frequency of the digital domain signal is an integer multiple of the frequency of the carrier signal. According to the invention, sampling can be conducted at a specific time to avoid the adverse effects of different saturation depths without the need of maintaining a relatively constant excitation saturation depth by means of closed-loop feedback. The determined excitation signal of the open-loop control can be usedand a closed-loop control loop and a low-pass filter are not required.

The invention provides a magnetic modulation current sensor. The magnetic modulation current sensor comprises a first magnetic core, a second magnetic core, a third magnetic core, a first coil, a second coil, an auxiliary coil, a primary coil, a secondary coil, an excitation signal generation unit and a current compensation unit, wherein the first coil and the second coil are respectively wound around the first magnetic core and the second magnetic core, the auxiliary coil is wound around the third magnetic core or the whole magnetic core, the primary coil and the secondary coil are wound around the whole magnetic core, the excitation signal generation unit is connected with input ends of the first coil and the second coil, an input end of the current compensation unit is connected with the second coil and the auxiliary coil, an output end of the current compensation unit is connected with the secondary coil, equivalent single-turns inductance of the first magnetic core and the secondmagnetic core is consistent, and the equivalent single-turns inductance of the third magnetic core is larger than those of the first magnetic core and the second magnetic core. The magnetic modulationcurrent sensor is a transformer model according to a modulation signal, the equivalent filtering inductance value of the secondary winding is improved by allowing the equivalent single-turns inductance of the third magnetic core to be larger than those of the first magnetic core and the second magnetic core, the filtering effect of excitation noise is improved, and thus, the modulation noise of the current sensor is prevented.

In a double drive shaft motor, a stator and a field rotor are arranged at a radially outer side of a magnetic modulation rotor. The stator and the field rotor are arranged in series in an axial direction of the motor. This structure increases an amount of a winding coil of the stator and magnets in the field rotor, and an output torque of the motor. When a field magnetic flux passes through soft magnetic material members in the magnetic modulation rotor, because the generation and the reception of the magnetic flux can occur at a radially same side of the magnetic modulation rotor, this structure cancels an eddy current generated in the soft magnetic members and supporting members made of non-magnetic metal which tightly support the soft magnetic member. This structure provides a reduced axial size of the motor with high performance.

The invention discloses an acceleration type linear magnetic gear permanent magnet composite motor which comprises a linear magnetic gear and a linear permanent magnet synchronous motor. The linear magnetic gear and the linear permanent magnet synchronous motor are connected in the length direction in series and coupled. The linear magnetic gear comprises a magnetic gear stator, a magnetic modulation sheet and a magnetic gear high-speed rotor. The magnetic modulation sheet is arranged between the magnetic gear stator and the magnetic gear high-speed rotor. A first air gap is formed between the magnetic gear stator and the magnetic modulation sheet. A second air gas is formed between the magnetic modulation sheet and the magnetic gear high-speed rotor. The linear permanent magnet synchronous motor comprises a primary linear permanent magnet motor and a secondary linear permanent magnet motor. A third air gap is formed between the primary linear permanent magnet motor and the secondary linear permanent magnet motor. A magnetic gear stator iron core and a primary iron core are connected in series, coupled and kept to be fixed. According to the structure of the acceleration type linear magnetic gear permanent magnet composite motor, a motor magnetic field is modulated through a magnetic modulation iron core ring, non-contact-type speed changing and thrust transmission are achieved, contact losses are reduced, the power density of the motor is improved, the system size and weight are reduced, and the manufacturing cost is reduced.

The invention discloses a magnetic field modulation type coaxial magnetic gear. The magnetic field modulation type coaxial magnetic gear comprises a first rotor, a stator magnetic modulation ring and a second rotor which are sequentially distributed and coaxially arranged, wherein any one of the first rotor and the second rotor is a salient-pole rotor, and the other one is a permanent-magnet rotor; the salient-pole rotor comprises a magnetic conduction body and ferromagnetic salient poles, the ferromagnetic salient poles are arranged at the magnetic conduction body at intervals along a circumferential direction and face the surface of the stator magnetic modulation ring, and the permanent-magnet rotor faces the surface of the stator magnetic modulation ring and is provided with (N-S) magnetic field loops which are continuously distributed; and the stator magnetic modulation ring comprises magnetic conduction elements which are arranged at intervals, and a non-magnetic conduction element region is arranged between adjacent magnetic conduction elements. In the magnetic field modulation type coaxial magnetic gear, only the permanent-magnet is made of a permanent-magnet material, the dosage of the permanent-magnet material is saved and the manufacturing cost is reduced on the conditions of ensuring torque transfer ability; and the salient-pole rotor is of a simple salient pole structure, the mechanical strength of the rotor can be improved, and the magnetic field modulation type coaxial magnetic gear is convenient to process and manufacture.

The invention provides a unit-motor modularized permanent magnetism synchronous linear motor, and belongs to the technical field of a motor. The unit-motor modularized permanent magnetism synchronous linear motor is formed by a plurality of unit motors, wherein each unit motor includes a primary assembly and a secondary assembly, wherein the primary assembly is formed by a primary iron core and armature windings; grooves are formed in the primary iron core, and the armature windings are arranged in the grooves; the secondary assembly is formed by a permanent magnet and a secondary iron core; an air gap is located between the primary assembly and the secondary assembly; a magnetic modulation structure is arranged between two adjacent unit motors; the width of the magnetic modulation structure is that S=(k+1 / 3)Tau (k is an integer and Tau is the polar distance of the motor); the arranging sequences of the windings in the grooves of two adjacent unit motors are different; and the winding directions of the windings on the two unit motors are opposite. The structure is conductive to inhibition of end portion effect, and can improve asymmetry of three-phase windings of the permanent magnetism synchronous linear motor and reduce thrust ripple.

The invention discloses a magnetic shielding structural part of a magnetic modulation voltage transducer. The magnetic shielding structural part comprises a base, a cover housing, an upper shielding plate, a shielding sleeve and a lower shielding plate. The base comprises a base plate, wherein a cylinder with an open upper end is fixed on the base plate, the lower shielding plate is fixed at the bottom in the cylinder, the upper shielding plate is fixed at the upper portion in the cylinder, and the lower shielding plate, the cylinder and the upper shielding plate define an internal cavity. The shielding sleeve is fixed outside the cylinder in a sleeved. The upper shielding plate, the lower shielding plate and the shielding sleeve are made from silicon steel. The cover housing is fixed with the base, the cover housing covers the cylinder and the shielding sleeve, and the top face of the cover housing is provided with a wire penetrating hole communicated with the internal cavity. The magnetic shielding structural part is provided with a shielding space defined by the upper shielding plate, the lower shielding plate and the shielding sleeve, prevents an external magnetic field from interfering magnetic circuit parts in the shielding space and is good in shielding effect, compact in shielding structure and low in manufacturing cost.

This invention discloses a low-cost device performing online real-time detection and management on a DC system bus and the insulation state of by-passes, which is widely applicable to the detection and management for the insulation states of the power operation power supply systems, solar photovoltaic grid-connected systems, DC power supply systems, and HVDC high voltage DC power supply which have various specifications. The DC insulation monitor consist of a resistance bridge among the DC positive electrode, the DC negative electrode and the ground, a leakage current sensor on each DC by-pass, a voltage measurement circuit group and a master controller. The DC insulation monitor greatly reduces requirement for the leakage current sensor and can be realized through the traditional Hall current sensor without the expensive magnetic modulation current sensor, so that the system cost is greatly reduced.

The invention discloses a direct-current leakage current sensor based on magnetic modulation. The direct-current leakage current sensor is used for monitoring direct-current insulation condition, and has good performance. The direct-current leakage current sensor comprises an oscillating circuit, a diode, a double magnetic core differential motion unit, a first filter, an instrument amplifier, a phase sensitive detector and a second filter. The direct-current leakage current sensor disclosed by the invention adopts half-wave simulation; compared with a traditional sensor, a frequency multiplier circuit for generating phase-sensitive detector reference signals is eliminated, the circuit structure is simplified, the inference as well as the cost is reduced, and the direct-current leakage current sensor has the characteristic of high sensitivity.

The invention relates to a novel magnetic field modulation type magnetic screw, belongs to the field of magnetic transmission, and solves the problems that an existing magnetic field modulation type magnetic screw is complex in structure, small in unit permanent magnet output and not suitable for long-stroke application occasions. The magnetic screw comprises a stator, a rotor and a spiral magnetic modulation ring, wherein the stator, the rotor and the spiral magnetic modulation ring are coaxially arranged; the stator and the rotor are of cylindrical structures, and the stator and the rotor are oppositely arranged; the spiral magnetic modulation ring is located between the stator and the rotor, and air gaps are reserved between the spiral magnetic modulation ring and the stator and betweenthe spiral magnetic modulation ring and the rotor; after the rotor is rotated by an external driving force, a spiral magnetic field generated by a permanent magnet on the rotor is adjusted through the spiral magnetic modulation ring, a harmonic magnetic field is generated in the air gap between the spiral magnetic modulation ring and the stator, the harmonic magnetic field interacts with a permanent magnet on the stator to generate an axial thrust, and the axial thrust acts on the spiral magnetic modulation ring, so that the spiral magnetic modulation ring moves linearly in the axial direction. The magnetic screw is mainly applied to the related fields of the magnetic transmission.

A magnetic transmission apparatus is disclosed, wherein the magnetic transmission apparatus includes a still part (4), a first rotating shaft (81), a second rotating shaft (82), a first rotating part (1), a second rotating part (2), and a third rotating part (3); the first rotating part (1) is rigidly connected with the first rotating shaft (81); the second rotating part (2), the third rotating part (3) are fixed on the second rotating shaft (82); the first rotating part (1), the second rotating part (2), and the third rotating part (3) are successively distributed along an axial direction; the still part (4) includes a magnetic regulation seat (41) and a magnetic regulation ring (42); the second rotating part (2) is located inside the magnetic regulation ring (42); the first rotating part (1) includes a first iron core (11), a first permanent magnet (12), and a first support part (811); the second rotating part (2) includes a second iron core (21), and a second permanent magnet (22); the third rotating part (3) includes a third iron core (31), a third permanent magnet (32), and a second support part (821); the first iron core (11), the first permanent magnet (12), the magnetic regulation ring (42), the third permanent magnet (32) and the third iron core (31) are successively distributed along the axial direction. The first permanent magnet (12) and the third permanent magnet (32) are magnetized alternately and axially; the second permanent magnet (22) is magnetized alternately radially. The magnetic transmission apparatus has an axially and radially mixed magnetic circuit and can take full advantage of the magnetic modulation space and improve the torque density.

A fast-response direct-current current transformer based on multi-sensor fusion is provided and includes: a magnetic modulator, a current correction module, an excitation transformer, an alternating current detection and filtering circuit, a phase-sensitive demodulation and filtering system, a PI controller, and a power amplifier. The current correction module measures a primary current and obtain a feed-forward signal, outputs a false balance state configured to control a magnetic core to quickly exit or avoid entering magnetic saturation after amplifying the feed-forward signal and a PI control signal, and keeps output of the magnetic modulator stable. The magnetic modulator and Hall current sensors are fused in the disclosure, such that the possibility of failure due to a false balance problem caused by saturation of a magnetic core is reduced. After the false balance is generated the magnetic core may be controlled to quickly exit a magnetic saturation state through a feed-forward output current.

Method and system of perpendicular magnetic recording and reproducing with ultra-high density for use in computer storage, audio, video recording euipment. Marks, as logical "1"-s are recorded at predeteremined distance from one another and their magnetic axes oriented in the opposite directions, as logical "0"-s are non-magnetized, forming pattern similar to chess-board order with the zero potential lines, eliminating crosstalk. Interaction "head-medium" is based on non-contact magnetic modulation, eliminating tribology problems. System may compose single or multi track medium, transporting linearly or rotating, with the immovable, quasi-immovable or scanning bi-polar or uni-polar magnetic heads, which have extremely small pointing conjugation area for interation with superminiature dimensions of magnetic fields of marks. System is realized by forming and recognizing the logical meaning of signals under checking of the strict general sequence different-directed alternation marks inside the tracks and in the neighboring tracks relatively of each other.