553results about How to "Small magnetic resistance" patented technology

The present invention is non-contact magnetically adsorbed wall climbing robot, belongs to the field of robot design technology, and aims at providing robot with both high moving flexibility and great loading capacity. The non-contact magnetically adsorbed wall climbing robot includes wheeled moving mechanism and permanent adsorption mechanism. The wheeled moving mechanism includes chassis, driving mechanism and wheels, which are laid symmetrically, driven in differential mode, and turns on wall by means of the speed difference of the wheels. The permanent adsorption mechanism has no contact with the magnetically conducting wall surface, high magnetic energy utilization, and high adsorption capacity. The wall climbing robot has high loading capacity, high motion flexibility, especially high turning flexibility, and excellent application foreground.

The invention discloses a radial magnetic field-based online abrasive grain monitoring sensor and monitoring method. The sensor comprises a magnetic field excitation source, an iron core, a detecting coil and an amplifying circuit, wherein a stable static magnetic field generated by the magnetic field excitation source forms a stable radial magnetic field by iron core optimization for being used for an oil pipe; and when an abrasive grain in the oil pipe generates inducing voltage by the detecting coil, the amplifying circuit carries out noise reducing and amplification processing output on the inducing voltage. The monitoring method comprises the following steps of: obtaining the induced voltage by the sensor; after processing the induced voltage by the amplifying circuit, obtaining an effective voltage signal; and confirming the motion speed, materials and size information of the abrasive grain by analyzing the waveform of the effective voltage signal. The invention uses the stable radial magnetic field as the monitoring magnetic field, optimizes the distribution of the magnetic field by an iron core, can effectively improve the sensitivity and precision of the sensor, is suitable for of the online abrasive grain monitoring of a hydraulic system and can provide service for the demand of state monitoring, fault diagnosis and service life prediction of the hydraulic system.

The invention discloses a magnetic gear composite motor. The magnetic gear composite motor comprises an outer stator, a modulation rotor and an inner rotor which are sequentially arranged in a concentrically nested manner from outside to inside, wherein air gaps are formed between the outer stator and the modulation rotor as well as between the modulation rotor and the inner rotor respectively; the outer stator is provided with a trapezoidal groove used for placing a fractional slot winding, and the groove opening is embedded with alternative-pole magnetic steel; the modulation rotor comprisesa plurality of magnet regulating yokes and a plurality of non-magnetic conductive materials embedded with punched holes respectively, and the adjacent magnet regulating yokes are embedded with the punched non-magnetic conductive materials therebetween; and the permanent magnet inner rotor comprises inner rotor permanent magnets and an inner rotor iron core which are concentrically nested to one another sequentially from outside to inside. According to the magnetic gear composite motor provided by the invention, a magnetic path of the magnetic gear motor on the stator is constructed through combining permanent magnets with different polarization directions, so that the magnetic path is enabled to be more efficient and reasonable, the flux leakage is reduced while low-speed and high-torquedirect drive output is realized, and the overall torque density and efficiency of the composite motor are improved.

The invention discloses a novel speed regulating system suitable for driving an electric automobile, which comprises the following steps: collecting phase currents iA, iB and exciting current if from an HESM (hybrid excitation synchronous machine) motor main circuit; collecting a real-time rotating speed nr from the HESM motor; obtaining d-q-axis currents id and iq after transforming the collected phase currents; comparing d-q-axis currents id and iq respectively with d-axis reference current idref and q-axis reference current iqref obtained from a current distributer and carrying out PID (proportion integration differentiation) operation, carrying out a reverse Park transformation and a space vector voltage pulse width modulation and outputing a pulse signal to control conduction and disconnection of a power tube corresponding to a armature driving module, and outputing the exciting current if and the exciting reference current ifref through an exciting driving signal generating module to control conduction and disconnection of the power tube corresponding to the exciting driving module, wherein the HESM motor adopts a dual-stator structure, an armature winding is arranged on an outer stator, and an inner stator is provided with an exciting winding; the motor rotor is configured as a claw pole shape, a permanent magnetic steel and a magnetizing iron core are in staggered arrangement on the claw pole, and the area rate of the permanent magnetic steel to the magnetizing iron core is 2:1.

A low power axial magnetic bearing with redundant structure is characterized in that it is composed of bearing body, exciting coils, permanent magnet, magnetic ring, air gap, auxiliary air gap and suspension body. The permanent magnet clings to the bearing body to generate bias flux, the magnetic ring clings to the permanent magnet and forms the auxiliary air gap with the bearing body, the air gap is formed among the magnetic ring, the bearing body pole and the suspension body to generate bias flux, the bearing body is winded with two groups of the exciting coils to generate control flux, the exciting coil, the permanent body and the magnetic ring are formed to redundant axial magnetic bearing stators relative to each other. The invention realizes the redundancy for the structure of the permanent bias axial magnetic bearing, prevents the electromagnetic magnetic path from passing the internal part of the permanent body, and reduces the exciting current. The invention has high reliability and low power consumption, and can work as non-contact support for the rotating components in the flywheel and other devices.

The invention is a disc wind power generator, where a stator is composed of windings without ferromagnetic material; a permanent magnet fixed on a rotor spindle is a rotating body with the rotor spindle as axis and corresponds to permanent magnets fixed in the upper and lower casings, the opposite surfaces has the same polarity and there is a gap between them; the generating line of the rotating body is a curve or a broken line or an oblique line. Because eliminating iron core, the magnetic resistance is reduced. Because eliminating bearing, it forms air suspension between the rotor spindle and the stator, reducing no-load resisting torque, raising efficiency of motor and implementing breeze power generation; the permanent magnet whose generating line is a curve or a broken line or an oblique line makes the rotor spindle able to automatically align and reset.

The motor includes following structure: DC exciting coil are setup between armature windings on stator; corresponding permanent magnet is setup at outboard of the DC exciting coil; there is bridge of guiding magnetism between DC exciting coil and the permanent magnet; direction of magnetic field is along circumferencial direction in motor. Method of mixed excitation of combining permanent magnetism excitation with electricity excitation is adopted in weak magnetism control method for controlling excitation of motor. The method increases regulating range by using smaller electricity excitation, suitable to application needed of changing speed in large range.

The invention discloses a magnetic field modulation hybrid excitation motor and a multi-working-wave design method thereof. The motor comprises a stator and a rotor, wherein the stator comprises a stator iron core, two sets of windings and permanent magnets, the two sets of windings comprise an armature winding and an exciting winding, the stator iron core is designed as an open slot, one set of windings is distributed in the open slot of the stator iron core, and is wound on one stator tooth in a centralized manner, the outer surface of each stator tooth is provided with a groove, the other set of windings is placed in the groove of the stator tooth, each stator tooth is split into two modulation teeth through the groove, one permanent magnet is placed on each modulation tooth, the otherwinding is wound on two adjacent modulation teeth formed by splitting different stator teeth in a centralized mode, and the magnetizing direction of the permanent magnets is consistent with or opposite to the direction of a magnetic field formed by the excitation winding on the modulation teeth. According to the invention, the permanent magnet magnetomotive force and the excitation magnetomotive force are connected in parallel on the magnetic circuit and are independent from each other, so that the risk of irreversible demagnetization caused by the introduction of an excitation current permanent magnet is avoided, and the effective exertion of the magnetic regulation capability is ensured.

Certain embodiments are directed to devices, methods, and/or systems that use electrical machines. For example, certain embodiments are directed to an electrical machine comprising: at least one stator at least one module, the at least one module comprising at least one electromagnetic coil and at least one switch, the at least one module being attached to the at least one stator; at least one rotor with a plurality of magnets attached to the at least one rotor, wherein the at least one module is in spaced relation to the plurality of the magnets; and the at least one rotor being in a rotational relationship with the at least one stator, wherein the quantity and configuration of the at least one module in the electrical machine is determined based in part on one or more operating parameters; wherein the at least one module is capable of being independently controlled; and wherein the at least one module is capable of being reconfigured based at least in part on one or more of the following: at least one operating parameter during operation, at least one performance parameter during operation, or combinations thereof. Other embodiments are also disclosed.

The invention provides a low-thrust fluctuation matrix combined iron core primary permanent magnet linear synchronous motor. The motor is composed of a plurality of independent type iron core primaries; the plurality of independent iron core primaries are arranged on secondaries at the bottom of the independent iron core primaries according to a form of transverse-and-longitudinal m*n matrix and are in rigid connection with the secondary through non-magnetic materials so as form an integrated body; each independent iron core is independently powered by a concentrated winding, and independence between each other can be ensured; and each independent type iron core primary is provided with a coil winding. According to a permanent magnet linear synchronous motor which adopts a concentrated winding and is provided with short iron core primaries, the invention provides the matrix combined iron core primary permanent magnet linear synchronous motor. According to the low-thrust fluctuation matrix combined iron core primary permanent magnet linear synchronous motor, the magnetic resistance fluctuation amplitude of the motor can be greatly reduced, and the average thrust of the motor can be increased manyfold, and the fluctuation amplitude of the motor can be reduced, and the performance of the motor can be improved.

The invention discloses a double-stator hybrid excitation motor with a T-type core inner stator. A center rotor is coaxially arranged in the middle of an outer stator and an inner stator. 12 T-type teeth are uniformly distributed along the circumferential direction of the inner stator yoke of the inner stator. The T-type teeth are sleeved with excitation windings. The top of each T-type tooth is near the center rotor. An inner stator slot is formed between every two adjacent T-type teeth. An arc permanent magnet is embedded fixedly between the tops of every two T-type teeth. The permanent magnets are magnetized along the tangential direction, and every two adjacent permanent magnets are magnetized in opposite directions. The inner and outer diameters of the permanent magnets are equal to the inner and outer diameters of the tops of the T-type teeth. The excitation windings are wound on the vertical parts of the T-type teeth of the inner stator, and thus, an electric excitation magnetic field connected in parallel with a permanent magnetic field is formed. The electric excitation magnetic field does not demagnetize the permanent magnets. When direct currents in different directions are fed to the excitation winding, the electric excitation magnetic field and the permanent magnetic field interact with each other to strengthen or weaken the magnetism.

The invention discloses a paralleling model semi-active vibration isolator. The vibration isolator is characterized in that a cylindrical upper shell is arranged, a rubber main spring is plugged in a top end opening of the upper shell, a main spring framework penetrates through the rubber main spring and is provided with an upper connection stud and a lower connection stud, the upper connection stud is connected with a main vibrating object, the lower connection stud is connected with a column-shaped iron core where an excitation coil is wound, the column-shaped iron core is supported in a magnetism conduction sleeve through a cutting magnetorheological elastomer arranged on the outer circumference of the column-shaped iron core, the two ends of the magnetorheological elastomer are extruded to be connected with the top of a T-shaped support and the bottom end of the iron core, and the T-shaped support penetrates through the magnetism conduction sleeve and is fixedly connected; the upper shell is connected with a lower shell, the lower end of the T-shaped support is fixedly connected with the lower shell, and the bottom of the lower shell is provided with a connection bolt used for being connected with a basal body. By means of the vibration isolator, vibrating energy transmitted by a rotary machine to the basal body can be effectively reduced, vibration of relative parts of the rotary machine is reduced, and the service life of the rotary machine and a system of the rotary machine is prolonged.

The invention discloses a vibration isolator with an active vibration absorbing ability. The vibration isolator with the active vibration absorbing ability is provided with a barrel-shaped upper shell, a rubber main spring is blocked in a top end opening of the upper shell, a main spring framework runs through the rubber main spring, a connecting stud is arranged at the top of the main spring framework, and the upper end of the connecting stud is used for connecting with a base body; the vibration isolator with the active vibration absorbing ability is provided with a lower shell connected with the upper shell, a shearing sleeve is fixed on the bottom plate of the lower shell, a column-shaped iron core is supported in the shearing sleeve through a magnetorheological elastomer arranged on the outer circumference of the column-shaped iron core, a magnet exciting coil winds the column-shaped iron core, and the magnetorheological elastomer works in a shearing mode; a magnetic conductive mass block is firmly connected with the iron core; a connecting bolt is arranged at the bottom of the lower shell for connecting with a main vibration object. The vibration isolator with the active vibration absorbing ability is capable of effectively lowering the vibration energy transmitted to the base body from a rotating mechanism, reducing the vibration of related parts of the rotating mechanism and improving the service life thereof.

A motor which can automatically start comprises a starting portion and an operating portion, wherein the starting portion is divided into a squirrel-cage type induction motor, while the operating portion is divided into a permanent type motor, the starting portion and the operating portion are separately arranged along the same axis, and wire windings thereof are respectively connected with a alternating-current power supply, the wire winding on the starting portion can be provided with a switch, when the starting portion drives the motor to achieve a synchronous speed, the operating portion is used to keep a synchronous operation of the motor and can close the starting portion to reduce copper loss.

A hybrid magnetic field controllable axial flux motor comprises two amorphous alloy stators and a rotor arrange between that two stators; The stator core of stator is divided into three parts along the radial direction, which are stator core in permanent magnet region, stator core in magnetic isolation region and stator core in electric excitation region. The armature winding of the permanent magnet region is arranged on the stator core of the permanent magnet region; The armature winding of the electric excitation region is arranged on the stator core of the electric excitation region; A permanent magnet and a ferromagnetic pole are embedded on the rotor bracket of the rotor part, respectively corresponding to the stator iron core of the electric excitation region and the stator iron coreof the permanent magnet region in the axial direction. The utility model has the advantages of simple manufacture, low loss, high power density and wide range of weak magnetic field expansion speed.

The invention discloses an electro-magnetic flux switching motor belonging to the field of the electro-magnetic motors. The electro-magnetic flux switching motor comprises salient pole stators, excitation windings, armature windings and salient pole rotors, wherein the salient pole of each stator is a U-shaped iron stator block, a strip-shaped magnetizer is embedded in the space between every two U-shaped iron stator blocks, the length of the magnetizer phase is less than that of the U-shaped arm of the U-shaped iron stator block, the excitation windings are wound on the magnetizer along the radial direction of the motor, and the armature windings are wound on the two U-shaped arms connected with the magnetizer. Based on the maintenance of the high sine degree of the idle stator flux linkage and the ambipolar idle stator flux linkage waveform of the flux switching motor, the invention makes the idle air-gap field to be completely adjusted by the exciting current with a strong magnetic field adjustment capability, thereby overcoming the defect that the air-gap magnetic field of the permanent-magnetism flux switching motor is difficult to adjust.