109 results about "Magnetic modulation" patented technology

The invention provides a single-ring sum-difference dual-modulation three-rotor coaxial magnetic gear and a new energy automobile hub motor. The magnetic gear comprises an h-type dual-modulation magnetic ring, an outer rotor, an inner rotor and a middle rotor. The inner rotor, the middle rotor and the outer rotor are coaxially and sequentially nested from inside to outside; the h-type dual-modulation magnetic modulation ring is positioned among the inner rotor, the middle rotor and the outer rotor, and is coaxially arranged with the inner rotor, the middle rotor and the outer rotor; the middle rotor is used as a power input rotor, the inner rotor and the outer rotor are used as power output rotors, a sum modulation effect is adopted from the middle rotor to the inner rotor, a difference modulation effect is adopted from the middle rotor to the outer rotor, and the sum modulation effect and the difference modulation effect share the h-type dual-modulation magnetic modulation ring; therefore, the h-type dual-modulation magnetic flux modulation ring modulates the axial magnetic flux and the transverse magnetic flux at the same time. The torque transmission capacity of the magnetic gear can be improved, the magnetic saturation phenomenon is restrained, the magnetic field modulation effect is enhanced, and the torque density of the magnetic gear is improved.

The invention provides an axial magnetic field modulation type magnetic gear applying a T-shaped modulation ring structure, which belongs to the field of motors and comprises a high-speed permanent magnet rotor, a low-speed permanent magnet rotor and a T-shaped modulation ring. The modulation ring comprises a plurality of T-shaped magnetic modulation pole pieces and T-shaped non-magnetic composite material pole pieces which are alternately arranged and bonded in the circumferential direction. The high-speed permanent magnet rotor and the low-speed permanent magnet rotor each comprise a rotor iron core composed of a plurality of rotor yokes, and N-pole permanent magnets and S-pole permanent magnets embedded between the adjacent rotor yokes in the circumferential direction. The high-speed permanent magnet rotor and the low-speed permanent magnet rotor coaxially sleeve the modulation ring on the two sides of the modulation ring respectively, and form radial and axial air gaps with the modulation ring. Leakage flux at the inner peripheral ends of the rotor yokes of the high-speed and low-speed permanent magnet rotors can enter the T-shaped modulation rings to be linked with magnetic flux generated by the corresponding rotor permanent magnets, the leakage flux at the inner peripheral ends of the rotor yokes on the two sides is reduced, the high-speed and low-speed rotors coaxially rotate, the air gap flux density can be increased, and therefore the gear output torque and the torque density are improved; meanwhile, the modulation ring is easy to process and compact in structure.

The invention relates to a double-layer permanent magnet radial field modulation type magnetic gear and a new energy automobile hub motor, the magnetic gear comprises a high-speed rotor, a magnetic regulation stator and a low-speed rotor, the high-speed rotor is composed of a high-speed rotor iron yoke and high-speed rotor permanent magnets, and the low-speed rotor is composed of a low-speed rotor inner layer permanent magnet, a low-speed rotor outer layer permanent magnet and a low-speed rotor iron yoke; the high-speed rotor iron yoke, the high-speed rotor permanent magnet, the flux-adjustable stator, the low-speed rotor inner-layer permanent magnet, the low-speed rotor outer-layer permanent magnet and the low-speed rotor iron yoke are coaxially nested in sequence from inside to outside; the high-speed rotor permanent magnet is composed of a plurality of permanent magnet modules of umbrella-shaped tooth structures, the low-speed rotor inner-layer permanent magnet is magnetized in a Halbach arrangement mode, the low-speed rotor outer-layer permanent magnet is magnetized in the radial direction, and the high-speed rotor permanent magnet is magnetized in a Halbach arrangement mode of umbrella-shaped teeth. The torque transmission capacity of the magnetic gear can be improved, the magnetic saturation phenomenon is restrained, the magnetic field modulation effect is enhanced, and the torque density of the magnetic gear is improved.

This application relates to the field of electrical technologies, and provides a full even harmonic digital demodulation method based on full-phase analysis for a magnetic modulator. According to the full even harmonic digital demodulation method based on full-phase analysis for a magnetic modulator, standard voltage timing data output by the magnetic modulator is obtained when a DC calibration current with a set amplitude is fed into the magnetic modulator during calibration of the magnetic modulator; an output voltage sequence from full-phase Fourier analysis is established based on the standard voltage sequence data, and the output voltage sequence is preprocessed; comprehensive analysis is performed on the preprocessed output voltage sequence from full-phase Fourier analysis to obtain all standard even harmonic signals and current conversion coefficients.

A transmission arrangement for a drivetrain of an agricultural towing vehicle includes an input shaft, an output shaft, a transmission device, a transmission unit, and an electric machine. The transmission device includes a mechanical transmission branch and a variable transmission branch with a magnetic-electrical epicyclic transmission stage having an internal rotor, an external stator, and an interposed rotatable magnetic modulation ring being rotationally conjointly connectable to a clutch drive shaft. The transmission unit is arranged downstream in the power flow and includes a first clutch and a second clutch connected to the clutch drive shaft and at least four gear sets for establishing at least four gear ratio stages. The electric machine is coupled to the input shaft and configured to transmit electrical power to the external stator, which is configured to rotate the modulation ring.

A current sensing apparatus, and a magnetic modulation method. The current sensing apparatus comprises: a magnetic core (110), wherein a conductor which carries a current signal under test passes through the magnetic core (110); a secondary coil (120), which is wound on the magnetic core (110); a sampling resistor (130), which is connected in series to the secondary coil (120), and is used for providing a sampling voltage signal which corresponds to an excitation current; an excitation control circuit (140), which is connected to the sampling resistor (130), and is used for generating a floating flip threshold signal on the basis of the sampling voltage signal, and outputting an excitation polarity signal on the basis of a comparison result of the sampling voltage signal with the floating flip threshold signal; and an excitation driving circuit (150), which is connected to the excitation control circuit (140) and the secondary coil (120), and is used for flipping the polarity of an excitation driving signal on the basis of the excitation polarity signal output by the excitation control circuit (140), such that the magnetic core (110) oscillates between a positive saturation point and a negative saturation point. The magnetic modulation effect in which the precision is high, the power consumption is low and a frequency response is good is obtained by means of a relatively simple circuit.

A sensor element for checking the authenticity of a planar data carrier, in particular a banknote, has a spin resonance feature. The sensor element contains a magnetic core having an air gap, into which the planar data carrier can be inserted for authentication and which defines an axial direction extending between the adjoining surfaces of the magnetic core, a polarization device for generating a static magnetic flux in the air gap, a modulation device for generating a time-varying magnetic modulation field in the air gap, and a resonator for exciting the spin resonance feature of the data carrier to be checked. The modulation device is formed by at least one planar coil arranged in the air gap, which planar coil has one or more turns about the axial direction of the air gap in one plane. The disclosure also relates to a checking device having such a sensor element.

The invention discloses a single-magnet-ring dual-processing-circuit switching wide-range leakage current sensor and method. A magnetic core works in a deep magnetic saturation state based on a magnetic modulation principle and is used for sensing a leakage current signal; the square wave self-oscillation circuit is used for sending a square wave signal to the coil by utilizing the inductance effect of the coil; each of the two signal processing circuits comprises a filter, a proportional amplifier and a lock-in amplifier, and only amplification factors of the proportional amplifiers are different, and the proportional amplifiers are used for processing induced leakage current signals; and the microprocessor is used for analyzing and processing the signal output by the signal processing circuit. The system can monitor the insulation state of the energy storage system in real time, effectively improves the safety and reliability of the system, and is suitable for photovoltaic power generation, wind power generation and other application scenes related to the energy storage system.

The invention relates to the technical field of direct current systems, in particular to a double-magnetic-core current detection structure and a current detection method. The method comprises the following steps: acquiring an induced electromotive force signal detected by a signal detector in the dual-magnetic-core current detection structure in claim 1; and performing residual current demodulation on a second harmonic component signal in the induced electromotive force signal to obtain a residual current signal in the line to be detected. According to the invention, accurate detection of the milliampere-level tiny residual current is realized under a large-current working condition through the double-magnetic-core current detection structure and the current detection method, and a milliampere-level direct-current residual current signal is modulated to a high-frequency carrier wave by using a magnetic modulation principle, so that the signal-to-noise ratio is remarkably improved, and the detection precision is improved. The problem of detecting tiny signals under the background of large signals is solved.

The invention discloses an optomagnetic modulation method and device for enhancing a single-beam free precession atom magnetometer signal, which is based on a synchronous optical pumping technology and a radio frequency magnetic field pulse control technology, controls the spin polarization of atoms through optomagnetic modulation and excites a free precession signal, so that more spin polarization components participate in free precession, and the free precession of the atoms is enhanced. And all-around signal enhancement of the single-beam free procession atom magnetometer is realized. The free precession signal is enhanced, the signal-to-noise ratio is improved, further improvement of the sensitivity of the single-beam free precession atom magnetometer is facilitated, and further application of the single-beam free precession atom magnetometer in the field of quantum precision magnetic field measurement in the future is facilitated.

The present invention discloses a high-precision magnetic modulator signal processing method based on adaptive filtering and noise compensation, and relates to the field of signal processing technology. This method obtains and preprocesses the initial output voltage signal of the high-precision magnetic modulator, then reanalyzes it based on an adaptive filtering algorithm, a noise compensation algorithm, and comprehensive processing to obtain a processed output voltage signal. The present invention, through the adaptive filtering algorithm and the noise compensation algorithm, can effectively improve the signal accuracy and anti-interference capability of the high-precision magnetic modulator. Because the adaptive filtering algorithm adjusts the filtering parameters in real time to adapt to noise interference in different environments, it significantly reduces the impact of external noise on signal measurement. At the same time, the noise compensation algorithm further reduces the noise component in the signal, improving the purity and reliability of the measured data, thereby enabling the signal processing method to maintain high-precision output under complex working conditions.

A magnetic modulator includes: a magnetic pole piece; a support portion disposed in an axial direction of the magnetic pole piece to rotationally support the magnetic pole piece; and a resin portion that integrates the magnetic pole piece and the support portion, in which at least one of both end surfaces of the magnetic pole piece in the axial direction is exposed.

The invention discloses a digital demodulation method for all even harmonics of a magnetic modulator based on full phase analysis, and relates to the field of electrical technology. The digital demodulation method for all even harmonics of a magnetic modulator based on full phase analysis obtains the standard voltage timing data output by the magnetic modulator when a DC calibration current of a set value is passed into the magnetic modulator during calibration of the magnetic modulator, establishes an output voltage sequence of full phase Fourier analysis based on the standard voltage timing data, and performs preprocessing, performs comprehensive analysis on the preprocessed output voltage sequence of the full phase Fourier analysis, and obtains each standard even harmonic signal and current conversion coefficient. The invention uses the full phase Fourier analysis technology to perform comprehensive preprocessing and comprehensive analysis on the output voltage signal of the magnetic modulator, significantly reducing the spectrum leakage and phase disorder problems, thereby ensuring that the data sampled at different time points can be fully utilized, making the signal processing more accurate.

Magnetic modulation gears (1) having different reduction ratios (R) are suitably lined up. A series of magnetic modulation gears (1) includes a first magnetic modulation gear (1A) and a second magnetic modulation gear (1B). Each of the first magnetic modulation gear (1A) and the second magnetic modulation gear (1B) includes an inner magnetic pole body (41a), an intermediate magnetic pole body (54), and an outer magnetic pole body (12); and the first magnetic modulation gear (1A) and the second magnetic modulation gear (1B) are different from each other in terms of any two of the number (Ni) of inner pole pairs that is the number of pole pairs of the inner magnetic pole body (41a), the number (Np) of magnetic pole pieces that is the number of magnetic poles of the intermediate magnetic pole body (54), and the number (No) of outer pole pairs that is the number of pole pairs of the outer magnetic pole body (12). At least one of the inner magnetic pole body (41a), the intermediate magnetic pole body (54), and the outer magnetic pole body (12) includes a component common to the first magnetic modulation gear (1A) and the second magnetic modulation gear (1B).

The invention discloses a high-precision magnetic modulator signal processing method based on adaptive filtering and noise compensation, and relates to the technical field of signal processing. According to the high-precision magnetic modulator signal processing method based on adaptive filtering and noise compensation, an initial output voltage signal of a high-precision magnetic modulator is obtained and preprocessed, analysis is carried out again based on an adaptive filtering algorithm, a noise compensation algorithm and comprehensive processing, and a processed output voltage signal is obtained; through the adaptive filtering algorithm and the noise compensation algorithm, the signal precision and the anti-interference capability of the high-precision magnetic modulator can be effectively improved, the adaptive filtering algorithm adjusts filtering parameters in real time so as to adapt to noise interference in different environments, the influence of external noise on signal measurement is remarkably reduced, and the measurement accuracy is improved. Meanwhile, the noise compensation algorithm further reduces the noise component in the signal, and improves the purity and reliability of the measurement data, so that the signal processing method can maintain high-precision output under complex working conditions.

The present invention discloses an axially magnetically modulated permanent magnet synchronous motor and a driving method thereof, comprising: a stator, a first rotor and a second rotor; the first rotor and the second rotor are coaxially connected and built into the stator; the first rotor is provided with a first rib structure, the second rotor is provided with a second rib structure, the first rib structure and the second rib structure are staggered at an angle in the axial direction; the end of the first rotor is provided with an inner ring magnetic conductive shaft connected to the first rib structure, the end of the second rotor is provided with an outer ring magnetic conductive shaft connected to the second rib structure and having a radius different from that of the inner ring magnetic conductive shaft, the rib structure of each rotor section and the magnetic conductive shaft connected thereto are of the same polarity, and the polarities between the two rotor sections are opposite, so that the magnetic flux on each rotor section enters the other rotor section along the rib structure and the magnetic conductive shaft connected to the rib structure to form a closed magnetic circuit; the extended ends of the inner ring magnetic conductive shaft and the outer ring magnetic conductive shaft are provided with excitation windings to adjust the magnetic flux of the closed magnetic circuit by adjusting the current of the excitation windings.

The application discloses a free precession type vector atomic magnetometer excitation measurement system based on FPGA and belongs to the technical field of magnetic field measurement, which comprises a laser unit, the laser unit is connected with an atomic magnetometer probe and a light pulse excitation unit respectively, a three-axis magnetic modulation excitation unit is connected with the atomic magnetometer probe through a three-axis magnetic coil, three-axis modulation coils are respectively arranged in X, Y and Z directions of the atomic magnetometer probe, a magnetic pulse excitation unit is connected with the atomic magnetometer probe through an excitation coil, the atomic magnetometer probe is connected with a three-axis vector free precession signal acquisition and processing unit, the three-axis magnetic modulation excitation unit, the magnetic pulse excitation unit, the light pulse excitation unit and the three-axis vector free precession signal acquisition and processing unit are all interactively connected with an upper computer, and the free precession type vector atomic magnetometer excitation measurement system based on FPGA has the advantages of good real-time performance, simple hardware structure, easy integration and low cost.

The present invention provides a dual-stator, dual-rotor, magnetic field modulation composite motor. The motor comprises an outer stator, an outer rotor, an inner rotor, and an inner stator, arranged in sequence from outside to inside. The outer stator comprises an outer stator core, the inner circumference of which is evenly distributed with multiple outer stator teeth, each wound with an outer armature winding. The inner stator comprises an inner stator core, the outer circumference of which is evenly distributed with multiple inner stator teeth, each wound with an inner armature winding. The number of inner stator teeth is the same as the number of outer stator teeth, and each inner stator tooth corresponds to each outer stator tooth in a one-to-one relationship. The outer rotor comprises a permanent magnet ring composed of a plurality of alternating first and second permanent magnets, each magnetized in opposite directions. The inner rotor comprises a modulation ring composed of multiple magnetic modulation cores, with the arc ratio between each magnetic modulation core and the gap adjacent to it being 0.86:1. This invention enables direct-drive, low-speed, dual-end, high-torque output.

The invention discloses a nonlinear quasi bound state terahertz non-magnetic regulation non-reciprocal transmitter and a control method, and belongs to the field of terahertz devices. The nonlinear quasi bound state terahertz non-magnetic regulation non-reciprocal transmitter is formed by periodically arranging and splicing a plurality of unit structures, and each unit structure comprises a silicon carbide substrate and a cylindrical groove gallium arsenide cylinder with the same outer diameter and different inner diameters. The non-linearity of the gallium arsenide material is combined with the asymmetry of the gallium arsenide cylindrical unit structures of the cylindrical grooves with the same outer diameter and different inner diameters, and the non-reciprocal transmission intensity of the terahertz waves is adjusted by changing structural parameters, so that the non-reciprocal transmission regulation and control of the terahertz waves are realized. The nonlinear quasi-bound-state terahertz non-magnetic regulation non-reciprocal transmission device designed by the invention is simple in structure, terahertz wave transmission can be regulated only by changing the incident power of terahertz waves without additionally arranging bias mechanisms such as an external magnetic field, electricity, light, a heat source and the like, and the nonlinear quasi-bound-state terahertz non-magnetic regulation non-reciprocal transmission device is suitable for a future terahertz integrated system.

The invention relates to the technical field of motor control, and discloses a rotor vibration suppression method based on outer air gap radial force of a stator partition magnetic regulation motor, which comprises the following steps of: 1, obtaining an inner and outer layer air gap accurate magnetic conductance model according to a conformal transformation method; 2, constructing two new rotor structures for inhibiting the radial force of the outer air gap of the motor; step 3, analyzing the reason for suppressing the low-order radial force amplitude of the outer air gap of the stator partitioned magnetic field modulation motor by the new rotor structure; and 4, establishing a multi-physical field structure model, and simulating the vibration performance of the stator partitioned magnetic field modulation motor with different rotor structures. According to the method, a magnetic conductance-magnetomotive force model is established to analyze the flux density-radial force harmonic waves of the stator partitioned magnetic field modulation motor, it is clear that dominant radial force harmonic waves for generating main electromagnetic vibration are distributed according to outer air gap radial force distribution characteristics of the stator partitioned magnetic field modulation motor, and a rotor of a surface and internal auxiliary groove structure is provided; and the radial force amplitude existing in the outer air gap is effectively inhibited.

A gear motor 100 comprises: a motor 20; a magnetic modulation gear 30 having a high-speed rotor (input shaft) 31 to which an output of the motor 20 is inputted, and an output shaft 32 of which the speed is changed with respect to the high-speed rotor 31 through a speed reduction unit; and a control device 40 that controls the output of the motor 20. The control device 40 controls the output of the motor 20 on the basis of torque-phase difference characteristics representing the relationship between an output torque of the output shaft 32 and phase difference information relating to rotational positions of the high-speed rotor 31 and the output shaft 32. Torque-angle characteristics of the output shaft 32 representing the relationship between the torque and the phase of the output shaft 32 are variable.

In a gear motor equipped with a magnetic modulation gear, the torque-angle characteristics are made variable. [Solution] The gear motor 100 includes a motor 20, a magnetic modulation gear 30 having a high-speed rotor (input shaft) 31 to which the output of the motor 20 is input, and an output shaft 32 that is speed-shifted relative to the high-speed rotor 31 through a reduction unit, and a control device 40 that controls the output of the motor 20. The control device 40 controls the output of the motor 20 based on a torque-phase difference characteristic that represents the relationship between phase difference information regarding the rotational position of the high-speed rotor 31 and the output shaft 32 and the output torque of the output shaft 32. The torque-angle characteristic of the output shaft 32, which represents the relationship between the torque and phase of the output shaft 32, is variable.

The invention relates to a magnetic modulation current sensor and a current measurement system. The magnetic modulation current sensor comprises a signal source, a modulation sensing assembly and a signal processing circuit, the signal source is used for providing alternating current signals, the magnetic modulation sensing assembly comprises a fixing piece, a plurality of bias units and a plurality of magnetic modulation units, the fixing piece is provided with a through hole used for arranging a wire to be detected, and the bias units are arranged in the through hole. The plurality of bias units are arranged on the fixed part at intervals and form a loop by taking any point on the axis of the wire to be measured as a central point, each bias unit is used for generating a bias magnetic field according to an alternating current signal, and each magnetic modulation unit is correspondingly positioned in each bias unit; each magnetic modulation unit is used for outputting an initial detection signal according to a bias magnetic field generated by the corresponding bias unit and an induced magnetic field generated by a to-be-detected current transmitted by the to-be-detected wire, and the signal processing circuit is used for determining the to-be-detected current according to the initial detection signal of each magnetic modulation unit. The magnetic modulation current sensor provided by the invention has relatively high detection precision.

The invention provides a multi-armature-source composite magnetic circuit trapezoidal domain high-efficiency permanent magnet motor, and belongs to the field of motors. The multi-armature-source composite magnetic circuit trapezoidal domain high-efficiency permanent magnet motor comprises a magnetism-adjusting armature source stator, a rotor and an excitation armature source stator which are arranged in the radial direction from outside to inside, an outer air gap is formed between the magnetism-adjusting armature source stator and the rotor, and an inner air gap is formed between the excitation armature source stator and the rotor; the adjustable-magnetism armature source stator comprises an adjustable-magnetism armature source stator yoke, i adjustable-magnetism armature source stator teeth embedded in the adjustable-magnetism armature source stator yoke and i adjustable-magnetism armature source stator windings, each adjustable-magnetism armature source stator winding is wound on each adjustable-magnetism armature source stator tooth, and i is a positive integer multiple of 3. By focusing on the application background of a novel electric off-road vehicle, the problems of insufficient instantaneous power output and narrow high-efficiency area range of the current electric off-road vehicle under complex working conditions are solved through the rotor composite magnetic circuit design and the cooperative cooperation of the excitation armature source and the magnetism adjusting armature source.

The application discloses a light-magnetic modulation method and device for enhancing a single-beam free precession atomic magnetometer signal, and is based on synchronous light pumping technology and radio frequency magnetic field pulse control technology. Through light-magnetic modulation control, atomic spin polarization and free precession signal excitation are realized, so that more spin polarization components participate in free precession, and full-range signal enhancement of the single-beam free precession atomic magnetometer is realized. The application enhances the free precession signal and improves the signal-to-noise ratio, which is helpful to further improve the sensitivity of the single-beam free precession atomic magnetometer and is convenient for further application of the single-beam free precession atomic magnetometer in the field of quantum precise magnetic field measurement in the future.

To suitably line up magnetic modulation gears having different reduction ratios.SOLUTION: The series of magnetic modulating gears 1 comprises a first magnetic modulating gear 1A and a second magnetic modulating gear 1B. The first magnetic modulation gear 1A and the second magnetic modulation gear 1B each include an inner magnetic pole body 41a, an intermediate magnetic pole body 54, and an outer magnetic pole body 12, and any two of the number of inner pole pairs Ni which is the number of pole pairs of the inner magnetic pole body 41a, the number of magnetic pole pieces Np which is the number of magnetic poles of the intermediate magnetic pole body 54, and the number of outer pole pairs No which is the number of pole pairs of the outer magnetic pole body 12 are different from each other. At least one of the inner magnetic pole body 41a, the intermediate magnetic pole body 54 and the outer magnetic pole body 12 includes a component common to the first magnetic modulating gear 1A and the second magnetic modulating gear 1B.SELECTED DRAWING: Figure 3

A method for manufacturing a magnetic modulator 50 comprises: a punching step for punching an electromagnetic steel sheet S into the planar shape of a magnetic pole piece 54 to produce a plurality of steel sheet pieces 54a; a stacking step for stacking the plurality of steel sheet pieces 54a to produce a plurality of magnetic pole pieces 54; a disposing step for disposing the plurality of magnetic pole pieces 54 on a peripheral surface of a cylindrical jig 70; and a molding step for performing resin molding so that the plurality of magnetic pole pieces 54 supported on the jig 70 are connected in a circumferential direction with resin. The peripheral surface of the jig 70 is formed with a plurality of recessed parts 70a into which the plurality of magnetic pole pieces 54 individually fit.

The present application relates to a kind of wave frequency energy emission devices, the device includes: electromagnetic modulation layer, for modulating preset frequency and power electric signal pulse, and change magnetic field is generated according to the electric signal pulse;Energy conversion layer is arranged in the magnetic field range of the change magnetic field, and the energy conversion layer is used to convert the magnetic field energy of the change magnetic field into vibration energy wave;The energy conversion layer is composed of one or two kinds of strain materials, and the expansion rate and response time of each strain material are different;The vibration energy wave is used to cause the resonance inside target object, to change the state of the target object.The present application utilizes the characteristics that the energy conversion layer generates expansion with the change of electromagnetic field, causes vibration, thereby converts into high-frequency vibration wave, thereby improves the efficiency and effect of energy output.

The invention provides a high-stability magnetic modulator excitation demodulation method without correcting a winding, and relates to the technical field of precise electromagnetic measurement and signal processing. A low-frequency current signal is equivalently injected into the magnetic modulator by adjusting the number-of-turns difference of excitation windings of two magnetic cores in the double-magnetic-core differential magnetic modulator and utilizing a microcontroller to control positive and negative duty ratio superposition low-frequency components of a square wave excitation source; by combining digital acquisition and Fourier analysis, a low-frequency voltage sequence and a second harmonic sequence are constructed, and a low-frequency proportionality coefficient and an actual direct-current proportionality coefficient are calculated, so that on-line calibration of a direct-current measured value is realized. Measurement errors caused by time and environment changes can be eliminated without additionally arranging a correction winding or a correction power supply, and the long-term measurement precision and stability of the magnetic modulator are remarkably improved.

The present invention discloses a hybrid permanent magnet memory motor and a multi-stage magnetic modulation pulse injection method, which relate to the technical field of memory motors. The present invention comprises: a stator core, wherein the inner circumference of the stator core is provided with a plurality of stator teeth, and the armature winding is installed between two stator teeth; and a rotor core, wherein the rotor core is sleeved inside the stator core. The Y-type topology structure of the present invention includes two different magnetic circuits, a series type and a parallel type. The high coercive force permanent magnet can provide a stable magnetomotive force, and since the high coercive force permanent magnet is located outside the rotor, it can effectively resist unexpected demagnetization under load conditions; the low coercive force permanent magnet can be bidirectionally magnetized, and most of the magnetic field forms a short circuit inside the rotor when the magnetism is weak, thereby effectively improving the magnetic modulation range. Compared with the traditional d-axis magnetic modulation, the magnetic modulation method only requires a smaller pulse current to achieve the same magnetic modulation effect as the traditional structure.