45results about How to "Reduce magnetic leakage" patented technology

The invention provides an electromagnetic wire coil, which comprises a wire coil rack and a wire coil; and granular or powdery magnetic substances are dispersed in the wire coil rack. Another aim of the invention is to provide a method for manufacturing the electromagnetic wire coil and an induction cooker. By directly adding the magnetic substances to the wire coil rack, the electromagnetic wire coil makes the wire coil rack act as an original magnetic bar, and can cancel all the magnetic bars used in the prior art; and for the action of the magnetic substances, magnetic lines are collected so as to promote thermal efficiency and reduce magnetic leakage and electromagnetic radiation. In addition, as the setting of the magnetic bars can be cancelled, the wire coil reduces the cost and the working procedure of assembling the magnetic bars; the wire coil rack is directly molded in an injection mode or the magnetic substances are extruded into the wire coil rack by an external force extrusion mode; and compared with the prior art, the electromagnetic wire coil is easier to process and reduces the production cost and the material cost of products.

The invention discloses a cross magnet unit which comprises a first magnet and a second magnet unit surrounding the first magnet. The first magnet is an N-pole magnet or an S-pole magnet. The magnetization direction of the first magnet is the Z-xis direction. The second magnet unit comprises four groups of magnet combinations with identical structure. The four groups of magnet combinations are respectively located in the X-axis direction and the Y-axis direction. The magnetization direction of the magnet combinations points at the N-pole magnet or is far away from the S-pole magnet. Each group of magnet combinations comprise at least two prism magnets, pyramid magnets or pyramid frustum magnets. A magnet array, a magnetic levitation planar motor and a lithographic device using the magnetic levitation planar motor are further disclosed.

The invention provides a linear motor which comprises a coil unit and a magnet unit. The magnet unit comprises two groups of symmetrical magnet arrays which are parallel relatively and are located on a magnet yoke, the magnet arrays are formed by a first-class magnet, a second-class magnet and a third-class magnet, the third-class magnet is arranged between the first-class magnet and the second-class magnet, the first-class magnet, the second-class magnet and the third-class magnet are periodically and alternatively distributed along an X axis in a Halbach magnet array mode, the first-class magnet and the second-class magnet are alternatively distributed along the X axis at an equal interval, and the magnetization direction of the first-class magnet and the magnetization direction of the second-class magnet are in the forward direction of a Y axis and the reverse direction of the Y axis. The third-class magnet is one prism magnet or comprises three prism magnets; when the third-class magnet is the prism magnet, the opposite surfaces of the adjacent magnets of different classes are both inclined planes; when the third-class magnet comprises the three prism magnets, the opposite surfaces of the adjacent different prism magnets are both inclined surface. Magnetic force lines formed in the linear motor are more continuous, the vertical magnetic flux and the horizontal magnetic flux in the magnet arrays can be improved, and therefore the pushing force in the corresponding direction can be improved.

The invention relates to a charged particle beam lithography system comprising:a charged particle optical column arranged in a vacuum chamber for projecting a charged particle beam onto a target, wherein the column comprises deflecting means for deflecting the charged particle beam in a deflection direction,a target positioning device comprising a carrier for carrying the target, and a stage for carrying and moving the carrier along a first direction, wherein the first direction is different from the deflection direction, wherein the target positioning device comprises a first actuator for moving the stage in the first direction relative to the charged particle optical column,wherein the carrier is displaceably arranged on the stage and wherein the target positioning device comprises retaining means for retaining the carrier with respect to the stage in a first relative position.

The invention discloses a moulding stamper for a magnetic shoe of a permanent magnet DC motor stator and a using method thereof. An upper die head consists of a bias magnetic die insert which is embedded in the center of an upper die block and is made of a non-magnetic material, and the upper die block made of a magnetic material; an lower die head consists of a hyperboloid die block made of a non-magnetic material and a lower die holder made of a magnetic material; and the radius of a curved surface of an upper head face of the lower die holder is less than that of an inner cambered surface of the magnetic shoe. The bias magnetic die insert and the hypoid die block are arranged vertically opposite to each other so as to change the trend of magnetic lines of force in a die cavity and the distribution orientation of the magnetic field in the magnetic shoe; the magnetic field intensity in the center of an outer cambered surface of the magnetic shoe is about 10 gausses; the magnetic field intensity on two sides of the magnetic shoe is gradually increased; and the magnetic field intensity in the center of the inner cambered surface of the magnetic shoe is 7-10 times that in the center of the outer cambered surface. The permanent magnet motor is provided with the obtained magnetic shoe, so that leakage of magnetism, temperature rising and noises of the motor can be reduced; air-gap magnetic flux of the motor can be increased by 10 to 15 percent; and overall performance of the permanent magnet motor can be improved.

The invention discloses an inductor, which consists of chassis and cap-shaped iron core, wherein the chassis contains several first mosaic parts and second mosaic parts with gap setting for each first and second mosaic part; the shape of the first and second mosaic parts is different; the cap-shaped iron core possesses at least two lateral walls with two walls connecting mutually; the boss is set at each connecting part; the notch is set on each lateral wall, which makes the first mosaic part of chassis insert each notch of cap-shaped iron core and second mosaic part of chassis insert each boss of cap-shaped iron core.

A rotor for a brushless motor includes a shaft, a rotor core and a number of permanent magnets. The rotor core includes inner and outer annular portions. The inner annular portion has a central hole for receiving the shaft. The outer annular portion includes a number of sector segments arranged in a ring, with adjacent sector segments defining a slot there between for receiving a corresponding permanent magnet. Radially outer ends of adjacent sector segments are interconnected by a connector. The sector segments include first sector segments and second sector segments arranged alternately. The first sector segments are separated from the inner annular portion. The second sector segments are each connected to the inner annular portion by connecting arms.

The invention provides a defrosting device. The defrosting device comprises a metal cylinder body, a radio frequency generator module, a radio frequency antenna, and a detection module, wherein the metal cylinder body is provided with a defrosting chamber with a forward opening in a qualified mode, the radio frequency generator module is used for generating a radio frequency signal, the radio frequency antenna is electrically connected with the radio frequency generator module and can generate radio frequency waves with corresponding frequency in the defrosting chamber according to the radio frequency signal, and the detection module is used for detecting an incident wave signal and a reflected wave signal of the radio frequency antenna; the detection module is configured to calculate therate of change of a dielectric coefficient of a to-be-processed material according to the voltage and current of the incident wave signal and the voltage and current of the reflected wave signal to determine the defrosting progress of the to-be-processed material; the defrosting device further comprises a baffle arranged in conductive connection with the inner wall of the defrosting chamber; and the detection module is arranged in a shielding chamber enclosed by the inner wall of the baffle and the defrosting chamber, interference of the radio frequency waves generated by the radio frequency antenna to the detection module can be effectively avoided, and the accuracy of the incident wave signal and the reflected wave signal detected by the detection module is improved.

The invention discloses a magnetic shield assembly of a circulator. The magnetic shield assembly comprises a cavity (1) and one or more shield plates (2), wherein the upper part, the lower part and the periphery of the cavity (1) are respectively provided with at least one shield plate (2) to form a closed magnetic circuit. According to the magnetic shield assembly of the circulator provided by the invention, a low-magnetic-resistance channel is provided, the advantages of increasing the magnetic circuit efficiency of the circulator, reducing magnetic leakage and reducing the influence of an external magnetic field to the electric performance of the circulator are achieved, magnetic-sensitive components around the circulator are protected from the influence of the magnetic field of the circulator, the energy of a permanent magnet is concentrated inside the circulator as much as possible, and thus, the maximal energy utilization rate is achieved.

The invention discloses a permanent magnet gyromagnetic apparatus, which is used in the time-varying magnetic field field and particularly suitable for the medical treatment and rehabilitation field. The permanent magnet gyromagnetic apparatus comprises four permanent bar magnets which are respectively arranged on four corners of a quadrangle, wherein, a target area is formed in the quadrangular area. The permanent magnet gyromagnetic apparatus has the advantages of definite target area, measurable single magnetic field, small magnet volume, safe operation, selectable field density and knowable field form, and fundamentally solves the problem that the prior apparatus can not be further improved and developed and overcomes the technical difficulty with bottleneck property in the magnetic medical treatment field.

The invention relates to an iron-core shielding roller type electromagnetic stirring sensor, which comprises an iron core and coil windings, wherein the iron core is a combined iron core, the coil windings are wound around the outer circumference of the combined iron core in sections at intervals, the intervals between the combined iron core and the coil windings are arranged in a hollow roller, the combined iron core and the coil windings are fixed by iron core shaft ends at two ends, and the combined iron core, the coil windings and the hollow roller correspondingly rotate to move; the combined iron core comprises the iron core, U-shaped shielding rings and O-shaped shielding rings, the iron core consists a main iron core and a secondary iron core, the U-shaped shielding rings annularlycover the outer side of the secondary iron core and the inner side of each coil winding, and the O-shaped shielding rings are arranged at two ends of the iron core and the coil windings, wherein magnetic poles are arranged among all coil winding groups wound on the main iron core. The invention has the advantages of improving the effect of a roller type electromagnetic stirring device and increasing the magnetic conduction area of the iron core, the strength of a magnetic field and the electromagnetic stirring force, and also solves the problems that the stirring force is not enough, the effect is low, the efficiency is low, the electromagnetic stirring force is small, the magnetic leakage of a nonworking area is large.

The invention relates to a three-phase launching guide rail applied to dynamic wireless power supply of an electric car and belongs to the technical field of wireless power energy transmission of theelectric car. The three-phase launching guide rail comprises multiple pi-type structures, strip-shaped ferrite magnetic cores longitudinally arranged according to a certain interval, multiple pi-typemagnetic pole structures formed by power supply cables wound around vertical rods of the pi-type magnetic cores, and a long straight type track formed by longitudinally arranging magnetic poles threeof which form one group according to the design interval. The three-phase launching guide rail has the characteristics that magnetic leakage is extremely small, and the electromagnetic compatibility is good.

The invention relates to a light and small optical fiber gyroscope structure with good environmental adaptability. A mounting base, an optical fiber ring mounting assembly, a mounting flange and an upper end cover are sequentially connected from bottom to top, and a gyroscope digital circuit board, a beam splitter and a Y waveguide are fixed on the mounting flange; in the optical fiber ring mounting assembly, an optical fiber ring base and an optical fiber ring upper cover form an annular cavity through a laser sealing welding process and are used for installing an optical fiber ring; and a gyroscope analog circuit, a temperature sensor and a light source are fixed on the mounting base. By designing the structure and used materials, miniaturization and light weight of the structural layout are realized, and the size and weight of the optical fiber gyroscope are reduced, so that the gyroscope is compact in overall structure, reasonable in layout, good in assembly manufacturability and small in size; a laser seal welding technology is adopted, so that magnetic leakage is reduced; a heat dissipation path is optimized, interference of a heat source on a heat-sensitive core component is reduced, temperature drift output by the optical fiber gyroscope is reduced, and output consistency and temperature stability of the gyroscope are improved.

The invention relates to a high-power panel EMI filter. The high-power panel EMI filter comprises a compound coil, a magnetic core, a tube shell, a cover plate, a base plate, a first interference rejection circuit and a second interference rejection circuit, wherein the compound coil is a disk-shaped structure formed by two mutually insulating leads via winding; the magnetic core is tubular and the compound coil is penetrated into the magnetic ore; one end of the tube shell is an open and hollow metal shell; the magnetic core is fixed at the bottom of the cavity of the tube shell; the cover plate is a metal plate; and the base plate is a printed circuit board. The compound coil is made into a disk shape by mutually insulating leads via winding and is placed in the tubular magnetic core, sothat a high-power compound inductor for the filter is formed, magnetic shielding and relatively high magnetic flux are realized, the power and performance of the filter are enhanced, and the problemthat the high-power inductors are high in winding difficulty is solved.

The invention discloses a receiver with a novel shielding case. The receiver comprises a bottom case, an upper cover, a sound production tube, an electromagnet drive device arranged in a cavity formed by the bottom case and the upper cover, and a vibration film component, wherein the shielding case is arranged on the bottom case and the upper cover, and the connection position of the bottom case and the upper cover is sealed by the shielding case. The receiver with the novel shielding case is simple in structure and magnetic leakage can be effectively reduced, besides the gap between the bottom case and the upper cover can be effectively sealed by the shielding case arranged on the bottom case of the receiver and the upper cover, thus magnetic leakage is prevented, magnetic interference is absent from the sound production tube of the receiver and the sound quality is ensured.

The invention discloses an axial magnetic flux leakage prevention three-rotor motor and an assembling method thereof. The three-rotor motor comprises a shell, a stepped shaft, a stator assembly and arotor assembly. The stepped shaft is rotationally installed in the shell. The stator assembly comprises an inner sleeve, a stator core and an outer sleeve. The outer sleeve is fixed on the inner wallof the shell and wraps the stator iron core. The stator core is fixed in the outer sleeve and is used for winding the winding. The inner sleeve is fixed in the stator core, and the stepped shaft penetrates through the inner sleeve. The rotor assembly comprises two lateral magnetic rings, a magnetic flux leakage prevention structure and two fixing discs. The magnetic flux leakage prevention structure comprises an inner magnetic ring and an outer magnetic ring. The inner magnetic ring is fixed on the stepped shaft and is positioned between the two lateral magnetic rings and in the inner sleeve.The outer magnetic ring is fixed on the inner walls of the fixing discs. According to the invention, the magnetic field of the double rotors can be enhanced, the magnetic flux leakage prevention structure is utilized to generate third rotating torque, magnetic leakage is reduced, mechanical energy converted from magnetic energy can be concentrated on the stepped shaft, and the utilization rate ofthe motor for electric energy can be improved.

An electromagnetic clutch (50) comprises an armature (51), a rotor (52) having an outer cylindrical portion (52a) and an inner cylindrical portion (52b), and an electromagnet (53), a bearing support cylinder (57) being provided on the outer end surface of a core (53b) that supports an electromagnetic coil (53a) of the electromagnet (53), a bearing (58) being incorporated into the inside of the bearing support cylinder (57) and being positioned and retained in the axis direction thereof. A small diameter cylindrical portion (52c) provided on an end of the inner cylindrical portion (52b) of the rotor (52) is press-fitted into the bearing (58) such that the rotor (52) and the electromagnet (53) form one unit, thereby improving ease of assembly of the electromagnetic clutch (50) and improving ease of management of the amount of overlap between the outer cylindrical portion (52a) of the rotor (52) and the core (53b) of the electromagnet (53).

The invention discloses a power factor corrector, which consists of iron core and coil bulk, wherein the iron core is composed of two cut symmetrical combination blocks of inner-ring typed egg-shaped bulk winded by steel band; the coil body is composed of coil bag with rough diameter coil and thin diameter coil; two symmetrical combination blocks are plugged in the coil bulk through butting pattern. The invention saves material with excellent radiation property, which reduces magnetic leakage phenomenon.

The invention relates to a driver for generating twisting motion in the mechanical engineering, in particular to a piezoelectric type twisting driver. The driver comprises a base, two piezoelectric material bonding sheets, a holding screw, a motion converting disk, an output shaft and a housing, wherein a through groove is formed at the center of the base, one end of each of the two piezoelectric material bonding sheets is fixed, the other ends of the two piezoelectric material bonding sheets transfer motion to the motion converting disk by using the holding screw which is connected with the motion converting disk through threaded connection or interference connection, no clearance is reserved between the piezoelectric material bonding sheets and the holding screw, the top of the motion converting disk is connected with the output shaft, and the housing fixes the output shaft by a bearing. The piezoelectric type twisting driver has the advantages of simple mechanical structure, small volume, low power consumption, high energy density, small magnetic leakage, high anti-electromagnetic interference ability, simple control circuit, low use cost, high response speed, small noise and strong commonality, and the like.

The invention discloses a motor and a washing machine. The motor comprises a stator iron core, wherein the stator iron core is provided with an axial through hole, the inner wall of the stator iron core is provided with a plurality of open slots along the circumferential direction, a stator tooth is formed between two adjacent open slots, and the stator tooth at least comprises an equal-width partwith equal tooth width; a rotor core which is arranged in the through hole, wherein a plurality of mounting grooves used for arranging the permanent magnets are formed in the rotor core in the circumferential direction, and a magnetic isolation area used for magnetic isolation and a magnetic conduction area used for magnetic conduction are arranged in the area, outside the mounting grooves, of the rotor core; the magnetic conductive area comprises a first area adjacent to the mounting groove, a second area adjacent to the outer periphery of the rotor core, and a third area connecting the first area and the second area, the width of the third area is equal, and the value range of the width of the third area is + / -0.5 mm of the width of the equal-width part. The power density of the motor can be improved on the premise of reducing the use amount of permanent magnet materials, so that the stack thickness and the axial size of the motor are reduced.

The invention provides a linear motor which comprises a coil unit and a magnet unit. The magnet unit comprises two groups of symmetrical magnet arrays which are parallel relatively and are located on a magnet yoke, the magnet arrays are formed by a first-class magnet, a second-class magnet and a third-class magnet, the third-class magnet is arranged between the first-class magnet and the second-class magnet, the first-class magnet, the second-class magnet and the third-class magnet are periodically and alternatively distributed along an X axis in a Halbach magnet array mode, the first-class magnet and the second-class magnet are alternatively distributed along the X axis at an equal interval, and the magnetization direction of the first-class magnet and the magnetization direction of the second-class magnet are in the forward direction of a Y axis and the reverse direction of the Y axis. The third-class magnet is one prism magnet or comprises three prism magnets; when the third-class magnet is the prism magnet, the opposite surfaces of the adjacent magnets of different classes are both inclined planes; when the third-class magnet comprises the three prism magnets, the opposite surfaces of the adjacent different prism magnets are both inclined surface. Magnetic force lines formed in the linear motor are more continuous, the vertical magnetic flux and the horizontal magnetic flux in the magnet arrays can be improved, and therefore the pushing force in the corresponding direction can be improved.

The invention provides a thawing device. The thawing device includes a metal cylinder defining a thawing chamber with a forward opening, a radio frequency generating module for generating a radio frequency signal, electrically connected with the radio frequency generating module and capable of generating radio frequency waves of corresponding frequencies in the thawing chamber according to the radio frequency signal The radio frequency antenna, and the detection module for detecting the incident wave signal and the reflected wave signal of the radio frequency antenna. The detection module is configured to calculate the change rate of the dielectric coefficient of the object to be treated according to the voltage and current of the incident wave signal and the voltage and current of the reflected wave signal, so as to judge the thawing progress of the object to be processed. The thawing device also includes a baffle arranged to be in conductive connection with the inner wall of the thawing chamber. The detection module is set in the shielding chamber surrounded by the baffle and the inner wall of the thawing chamber, which can effectively prevent the radio frequency waves generated by the radio frequency antenna from interfering with the detection module, and improve the accuracy of the incident wave signal and the reflected wave signal detected by the detection module. accuracy.

The invention relates to a high-reliability relay for a radio-frequency switch. The high-reliability relay comprises a lower cover plate, a long screw, a housing, a coil skeleton, an upper cover plate, an upper end cover, an iron core, a moving column and a coil. The magnetic-conductive-material-based housing and the upper end cover form an enclosed structure to reduce the magnetic leakage; and thus the magnetic energy is utilized to the greatest extent. The moving column is formed by an upper moving column and a lower moving column that are connected by threads and thus an upper insulating magnetic sheet, the iron core, and a lower insulating magnetic sheet are fixed; and the straightness of the moving column is guaranteed by threaded connection. The insulating magnetic sheet and the lower insulating magnetic sheet are able to buffer the impact forces in the presence of the impacts with the upper end cover and the housing; and the impact force of the moving column is cancelled effectively by using a buffer reed, so that noises during relay switching are reduced. An upper linear sliding bearing is in direct contact with the upper moving column and a lower linear bearing is in direct contact with the lower moving column, so that the friction force on the moving column is reduced effectively and thus the switching service life of the relay is prolonged.

The invention provides a curved-surface thin-wall part vibration control device based on permanent magnet driving. The device comprises an electromagnetic permanent magnet driving mechanism, a drivenmechanism, a movement conversing mechanism and a self-adaptive jacking mechanism; the electromagnetic permanent magnet driving mechanism is arranged on the base, and the electromagnetic permanent magnet driving mechanism is connected with the driven mechanism and provides a power source for the driven mechanism; the driven mechanism is connected with the movement conversing mechanism, the movementconversing mechanism converts the reciprocating movement of the driven mechanism into vertical movement; and the movement conversing mechanism is also arranged on the base, the movement conversing mechanism is connected with the self-adaptive jacking mechanism, and the self-adaptive jacking mechanism can move up and down under driving of the movement conversing mechanism. According to the curved-surface thin-wall part vibration control device, the movement output of a plurality of positions can be realized by one driving source, so that the driving sources are saved, and the overall structureof a system is more compact, and in addition, the power source is generated by utilizing an electromagnetic permanent magnet mode, so that compared with a linear motor and a voice coil motor with thesame size, the output rigidity of the electromagnetic permanent magnet driving mechanism is larger.

The invention discloses a hollow large torque servo motor. The servo motor comprises a hollow direct shaft, a first annular step is arranged on the portion, near the front, of the middle of the directshaft, the first annular step is sleeved with a stator core, a stator coil winds on the periphery of the stator core, the outer side of the stator core is provided with an inner rotor core, the innerside of the inner rotor core is bonded with a magnet adjusting magnetic steel through magnetic force, the two ends of the inner rotor core are fixed on a front end cover and a back end cover, and thefront end cover and the back end cover are rotationally supported on the direct shaft; the height-to-width ratio of the stator core is 0.5-3, the width of the inner rotor core is greater than that ofthe stator core, and the length of the first annular step is greater than the width of the stator core. The height-to-width ratio of the stator core is 0.5-3, not only can large enough magnetic forcebe provided, but also the large enough magnetic force transfer area can be provided, the width of the inner rotor core is greater than that of the stator core, it can be ensured that inner rotor coreacquires the large enough magnetic force, and the magnetic leakage is reduced, thereby achieving that the structure is compact, and the large torque can be transferred.

The invention discloses an insert type water meter, and belongs to the field of water supply measuring instrumentation. The insert type water meter consists of a coaxial cable, a copper tube, a stainless steel shell, a polarity detector, a permanent magnet, a magnetic field test coil, positive and negative electrodes, a lead wire plate, a shield plate, a coil brace, a plastic piece and an intelligent part; and the insert type water meter is mainly used in the field of flow measurement. The insert type water meter has a simple structure, small volume and low cost, changes to utilize the permanent magnet and the electrodes as a basic meter, has the advantages of reliable performance, flexible control, uneasy blockage and so on, and has quite important significance.

The invention provides a thawing device. The thawing device includes: a cylinder body defining a thawing chamber with a forward opening for placing the object to be treated; a device door for opening and closing the thawing chamber arranged at the forward opening of the thawing chamber; For generating the radio frequency generation module of radio frequency signal; And be respectively horizontally arranged at the top wall and the bottom wall place of the thawing chamber, and the upper electrode plate and the lower electrode plate that are electrically connected with the radio frequency generation module respectively, so that according to the radio frequency signal in the thawing chamber The radio frequency waves of the corresponding frequency are generated in the chamber, and the objects to be treated in the thawing chamber are thawed. The cylinder body and the device door body are respectively provided with electromagnetic shielding features, and the electromagnetic shielding features arranged on the cylinder body and the electromagnetic shielding features arranged on the device door body are set as conductive connections, so as to reduce the outward movement of the thawing device when the device door body is closed. magnetic leakage. The invention can effectively reduce the magnetic leakage of the thawing device and reduce the harm to users.

A strip line type annular isolator disclosed in the invention comprises a cavity (1), a cover plate (2), a center conductor (3), a left containing cavity (5) and a right containing cavity (6), the left containing cavity (5) and the right containing cavity (6) are arranged in the cavity (1), the left containing cavity (5) is communicated with the right containing cavity (6), two left positioning grooves (7) are formed in the inner wall of the left containing cavity (5) in the axial direction of the left containing cavity (5), and two right positioning grooves (8) are formed in the inner wall of the right containing cavity (6) in the axial direction of the right containing cavity (6). Internal threads are arranged at the upper end of the left containing cavity (5) and the upper end of the right containing cavity (6), external threads (9) are arranged on the outer wall of the cover plate (2), and the cover plate (2) is in threaded connection with the internal threads through the external threads (9). And lower rotating magnetic sheets (10) are supported in the left containing cavity (5) and the right containing cavity (6). The strip line type annular isolator has the beneficial effects of compact structure, improved assembly efficiency, suitability for mass production and good shielding effect.

The invention relates to a driver for generating twisting motion in the mechanical engineering, in particular to a piezoelectric type twisting driver. The driver comprises a base, two piezoelectric material bonding sheets, a holding screw, a motion converting disk, an output shaft and a housing, wherein a through groove is formed at the center of the base, one end of each of the two piezoelectricmaterial bonding sheets is fixed, the other ends of the two piezoelectric material bonding sheets transfer motion to the motion converting disk by using the holding screw which is connected with the motion converting disk through threaded connection or interference connection, no clearance is reserved between the piezoelectric material bonding sheets and the holding screw, the top of the motion converting disk is connected with the output shaft, and the housing fixes the output shaft by a bearing. The piezoelectric type twisting driver has the advantages of simple mechanical structure, small volume, low power consumption, high energy density, small magnetic leakage, high anti-electromagnetic interference ability, simple control circuit, low use cost, high response speed, small noise and strong commonality, and the like.

The invention discloses an electromagnetic cooking appliance capable of three-dimensionally heating a cooking container. The electromagnetic cooking appliance comprises an electromagnetic oven and a coupling heating device, wherein an excitation coil capable of generating alternating magnetic field is arranged in the electromagnetic oven; the coupling heating device can be combined with the electromagnetic oven for use and is arranged on the electromagnetic oven; the coupling heating device comprises a seat, an electromagnetic heating coil and a coupling coil for providing energy for the electromagnetic heating coil; and the coupling coil is electromagnetically coupled and correspondingly arranged with the excitation coil. The electromagnetic cooking appliance disclosed by the invention transmits energy from the electromagnetic oven to the electromagnetic coupling heating device in an electromagnetic coupling mode to three-dimensionally heat the cooking container, thereby improving cooking effect of the electromagnetic oven, promoting market capacity of the electromagnetic oven, simultaneously, overcoming the defects that the electromagnetic oven is apt to stick bottom and explode by concentrated heating, and improving use security.