62results about How to "Reduce magnetic saturation" patented technology

The objective of this invention is to provide a motor which can reduce occurrence of a torque reduction in the overload, and also lower the temperature of a motor main body immediately even in the case of a temperature rise in the motor main body. This motor comprises: a stator 20 that is constituted by a stator main body 1 having a plurality of slots 4 formed on the circumference of the main body with equal intervals from each other and teeth 3 each of which is located between the slots 4, and extends outward along the radial direction from the slot bottom face of the slots 4 with the same width, and a coil bobbin 7 that is attached to each of the teeth 3 of the stator main body 1, and is formed by winding a wire 6 around a bobbin 5 that has been preliminarily made from an insulating material such as a resin, in a concentrated winding system; and a rotor 2 that is maintained on the circumference of the stator 20 concentrically with the stator main body 1, in a manner so as to face the stator main body 1 through a predetermined air gap 19.

An electric motor comprising: a frame; and a stator assembly; the stator assembly including a bobbin assembly and at least one c-shaped stator core. The frame comprises at least one lug, the bobbin assembly includes at least one recess, and the stator assembly is fixed to the frame by fixing the lug inside the recess of the bobbin assembly.

The invention relates to an immobilized enzyme for a magnetic nanometer clay carrier. The immobilized enzyme comprises a carrier with saccharifying enzyme and corresponding immobilized enzyme as immobilizing objects. The immobilized enzyme is prepared by taking a covalence coupling method as an immobilizing method and is characterized in that: the carrier is a magnetic nanometer Fe3O4@ clay compound material; the magnetic nanometer Fe3O4@ clay compound material is composed of magnetic Fe3O4 nanometer grains and a nanometer clay material; and the magnetic Fe3O4 nanometer grains are assembled on the nanometer clay in sequence. A superparamagnetic Fe3O4@ clay compound material is prepared by adopting a solvent heat method according to the invention; the surface of the Fe3O4@ clay compound material is modified by using gamma-aminopropyl triethoxy silane, and then glutaraldehyde is used as a coupling agent for covalently fixing the saccharifying enzyme on the surface of the carrier; two novel carrier regenerating strategies are designed; after the saccharifying enzyme is immobilized by the regenerated carrier, the excellent properties, such as original activity, thermal stability and reusability, of the immobilized enzyme are still maintained; and the immobilized enzyme is also suitable for the regeneration of the immobilized enzyme carrier according to the covalence coupling method.

The invention discloses a permanent magnet motor and a compressor with the permanent magnet motor. The permanent magnet motor comprises a stator and a rotor; the stator comprises a stator core and a stator winding; the stator core forms a ring and a plurality of stator teeth are arranged on the inner ring, stator slots are defined between adjacent stator teeth, and the stator winding is wound in the stator slots; the rotor is rotatably arranged at the inner side of the stator; the rotor comprises a rotor core and a permanent magnet; a mounting groove is arranged on the rotor core, wherein the mounting groove penetrates through the rotor core along the axial direction, and the permanent magnet is arranged in the mounting groove; the permanent magnet motor satisfies the following formula: W2 is not less than 0.25*W3* [Q / (2*p)] and less than W1, wherein W1 and W2 are respectively a maximum width and a minimum width of a working surface of the permanent magnet in a direction vertical to the axial direction of the rotor core, W3 is a pole body width of the stator teeth, Q is the quantity of the stator slots, and p is the number of pole pairs of the permanent magnet motor. According to the permanent magnet motor provided by the invention, the magnetic saturation degree of shoulders of the stator teeth can be reduced, the dosage of magnets can be reduced, and the cost can be reduced.

In a process where the energy accumulated in the transformer while a transistor is turned ON is emitted to an output circuit and an LED is illuminated with the emitted energy, a voltage generated across a resistor is monitored by a control circuit. When the current flowing through the transistor has reached a limit current value, the ON operation of the transistor is limited. When the output voltage of the output circuit has exceeded a first set voltage, the limit current value is lowered and the ON operation of the transistor is further limited. When the output voltage of the output circuit has exceeded a second set voltage, the ON operation of the transistor is forcibly stopped.

A magnetic metal-containing resin that includes 70 to 88 mass % of a magnetic metal powder and 5.0 mass % or more of an oxide, and the oxide is 2.8 μm or more in average particle size. The magnetic metal-containing resin preferably includes 10 mass % or more of the oxide.

The invention discloses an LCL filtering-based circuit topology structure of a high-power PWM (pulse-width modulation) rectifier. The circuit topology structure of the PWM rectifier comprises a single-phase PWM rectifier and a PWM rectifier adopting a three-phase and four-wire system; a better filtering effect is achieved by replacing the traditional L filter with an LCL filter; a PWM rectifier control method is based on the pulse width modulation technology of an SPWM (sinusoidal pulse width modulation) mode, and a control mode for a voltage outer loop and a current inner loop is adopted; a PI control mode is adopted by the common voltage outer loop and the independent current inner loop, and P and I parameters are respectively set for the common voltage outer loop and the independent current inner loop. According to the LCL filtering-based circuit topology structure disclosed by the invention, current and voltage cophasing at the grid side can be realized, so that the harmonic content of the grid side is reduced, and the harmonic pollution is reduced.

The invention provides a method for optimizing the in-cell magnetic field of aluminum electrolysis cell, relating to a magnetic field optimizing method for configuring bus of aluminum electrolysis cell. The method is characterized in that: on the way that the compensation bus goes to the object position, a ferromagnetic shielding cover is sheathed on a section where the bus has negative effect to the in-cell magnetic field in order to reduce side effect of the bus. The method effectively overcomes the drawback of the traditional compensation bus configuration by sheathing the shielding cover around part of the compensation bus located at the bottom of the electrolysis cell, thus, the compensation bus has little negative effect on the other magnetic field on the way for reducing the magnetic field of the object position, so that the magnetic field of the electrolysis cell can be easily reduced, especially applicable for the bus configuration design of large aluminum electrolysis cell with the advantages of being stable, high efficiency, long life.

The invention provides a motor rotor, a reluctance motor and an electric vehicle. The motor rotor comprises a rotor core (1), and the rotor core (1) comprises a plurality of magnetic barrier groups. Each magnetic barrier group comprises at least two magnetic flux barriers (2); magnetic conduction channels (3) are formed between the adjacent magnetic flux barriers (2); permanent magnets (4) are arranged in the magnetic flux barriers (2); and, under the same pole, the pole arc field angle of the flux barrier (2) on the innermost side in the radial direction at the front edge of the D-axis rotation direction is psi; the pole arc opening angle of the radially innermost magnetic flux barrier (2) located at the rear edge of the D-axis rotation direction is psi1, the pole arc opening angle of theradially outermost magnetic flux barrier (2) located at the front edge of the D-axis rotation direction is xi, and the pole arc opening angle of the radially outermost magnetic flux barrier (2) located at the rear edge of the D-axis rotation direction is xi1, wherein psi> psi1, and xi> xi1. According to the motor rotor, the flux density of the leading-edge magnetic conduction channel can be reduced, local magnetic flux leakage is reduced, and the output torque of the motor is improved.

The invention relates to the field of numerical control blades, in particular to a numerical control blade for heavy-load machining and a preparation method thereof. The numerical control blade comprises a hard alloy basal body and a coating, and the thickness of a release beta layer on the hard alloy basal body is 1-5 [mu]m. The hard alloy basal body is composed of Co, TNC8, TiCN, (TI,W) C and WC. A preparation method of the numerical control blade comprises the following steps that the Co, the TNC8, the TiCN, the (TI,W) C and the WC are correspondingly weighed and taken; the prepared Co, theTNC8, the TiCN, the (TI,W) C, the WC and a forming agent are mixed uniformly, then the mixture is placed into a ball mill machine for ball-milling after pelleting, pressing and sintering are carriedout on the mixture after the ball-milling, and the hard alloy basal body is obtained; and the surface of the prepared hard alloy basal body is coated with a CVD coating, then sand blasting treatment is carried out, and the numerical control blade for the heavy-load machining is obtained. The prepared numerical control blade has better abrasion resistance and impact resistance, and can meet the requirement of the heavy-load machining.

It is composed of silicon: 3.0-8.0 % in weight, oxygen 0.1-1.0%, Mn, Al, V, Cr and Ti: at least 0-2.0% for one of then (not including zero) and remaining Fe. The alloy powder is prepared with actual size below 150 micro m and mixed with bonding agent to be formed with metal mold by compression, Therefore, magnetic powder core is got with over 20 AC permeability under 12000A / m DC applied magnetic field at 20kH2 1000 KW / m3 core loss property under 20KHz, 0.1T, over 1000G magnetic saturation and lower than 3.00e magnetic retentivity.

The invention provides a motor, a compressor and refrigeration equipment. The motor comprises a stator, the stator is provided with a plurality of stator teeth arranged in the circumferential direction of the stator, and a stator slot gap is defined by every two adjacent stator teeth; each coil group comprises a plurality of coils wound on the stator teeth, and each coil correspondingly bypasses one corresponding stator tooth; the rotor is arranged in the stator, the rotor comprises a rotor iron core and a plurality of permanent magnets, a plurality of slots are formed in the rotor iron core,the plurality of slots are circumferentially distributed around the rotating center line of the rotor iron core, and the plurality of permanent magnets are arranged in the plurality of slots; the residual magnetism Br of each permanent magnet at 20 DEG C meets the condition that Br is greater than or equal to 1.2 T; the inner diameter phi si of the stator and the outer diameter phi so of the stator meet the condition that phi si / phi so is larger than or equal to 0.558 and smaller than or equal to 0.576. Motor operation noise reduction.

The present invention is a high efficiency permanent magnet machine capable of maintaining high power density. The machine is operable over a wide range of power output. The improved efficiency is due in part to copper wires with a current density lower than traditional designs and larger permanent magnets coupled with a large air gap. In a certain embodiment wide stator teeth are used to provide additional improved efficiency through significantly reducing magnetic saturation resulting in lower current. The machine also has a much smaller torque angle than that in traditional design at rated load and thus has a higher overload handling capability and improved efficiency. In addition, when the machine is used as a motor, an adaptive phase lag compensation scheme helps the sensorless field oriented control (FOC) scheme to perform more accurately.

The invention provides a rotor assembly and a consequent pole motor. The rotor assembly comprises a rotor core (1), the rotor core (1) comprises permanent magnet poles and consequent poles, the permanent magnet poles and the consequent poles are alternately arranged along the circumferential direction, the permanent magnet poles comprise mounting grooves (2), permanent magnets (3) are mounted in the mounting grooves (2), first air grooves (4) extending along the direction far away from the center lines of the permanent magnet poles are formed in two circumferential ends of the mounting grooves(2), and air grooves are not formed in the radial peripheral sides of the mounting grooves (2). According to the rotor assembly, the torque ripple of the motor in the operation process can be reduced, and the reliability of the motor is improved.

The invention discloses a suspension electromagnet for a medium-and-low-speed magnetic levitation train. The suspension electromagnet comprises an inner pole plate and an outer pole plate in opposite interval arrangement, wherein one or more than one iron core is connected in a gap formed between the inner pole plate and the outer pole plate, a coil is wound on the iron core, and outer side bulge parts are respectively arranged at the outer surface of the inner pole plate and the outer surface of the outer pole plate. The suspension electromagnet for the medium-and-low-speed magnetic levitation train provided by the invention has the advantages that the outer surface of the inner pole plate and the outer surface of the outer pole plate are made to be outwards bulged, according to electromagnetic simulation and practical operation experience, the reasonable cross section shapes of the inner pole plate and the outer pole plate are obtained, the mechanical structure and heat radiation factors are considered in a combined way for optimizing the three-dimensional structure, the magnetic saturation generated in partial regions can be effectively reduced, the levitation force is improved, and the structure intensity, the reliability and the heat radiation efficiency are improved.

The invention discloses an electromagnetic circuit system and an electromagnetic relay. The electromagnetic circuit system comprises a yoke iron, an armature and a coil, wherein the coil is composed of a coil rack and an enameled wire, the coil rack is provided with a through hole for installing an iron core, the yoke iron comprises an L-shaped yoke iron and a U-shaped yoke iron, one edge of the L-shaped yoke iron and one side edge of the U-shaped yoke iron are respectively and oppositely inserted into the through hole of the coil rack from the two ends of the through hole of the coil rack to prop against each other so as to form the iron core installed in the through hole of the coil rack, an end edge at other side edge of the U-shaped yoke iron serves as a knife edge for supporting one end of the armature, and the other edge of the L-shaped yoke iron serves as a pole surface for attracting the other end of the armature during working of the coil. By improving the yoke iron structure, the magnetic circuit system has the characteristics of high magnetic conductivity and excellent assembly process, the usage of the enameled wire can be effectively reduced, and product volume is reduced.

A server farm has servers with at least one hybrid computing module operating at a system clock speed that optimally matches the intrinsic clock speed of a semiconductor die embedded within a high speed semiconductor chip stack or mounted upon the semiconductor carrier.

The invention provides a motor stator and a permanent magnet synchronous motor. The motor stator comprises a stator core (5), wherein the stator core (5) comprises a stator tooth part (6), the stator tooth part (6) comprises a stator tooth boot (7), the stator tooth boot (7) sequentially comprises a second extension section (9) and a first extension section (8) from outside to inside in the radial direction on the cross section of the stator core (5), and radial thickness of the second extension section (9) is larger than that of the first extension section (8). According to the motor stator provided by the invention, the motor leakage flux can be reduced from the stator side, the output torque is increased, and motor efficiency is improved.

The invention provides a chemical plating nickel alloy solution. The solution adopts three different organic carboxylic acids for combination, the crystallization property of a chemical plating nickel alloy coating is improved, so that the chemical plating nickel alloy coating has excellent paramagnetic thermal stability. The content of cobalt and copper in the obtained nickel alloy coating can reach 2-3 wt%, the content of phosphorus can reach 12-15 wt%, and the nickel alloy coating has excellent high-temperature resistance, can still keep stable paramagnetic performance and lower magnetic saturation performance after being subjected to heat treatment for more than one hour under the high-temperature condition as high as 450 DEG C, and is particularly suitable for manufacturing the heat-assisted magnetic recording storage medium.

The invention provides a rotor stator structure of a permanent magnet brushless DC motor, which belongs to the technical field of motors. It solves the problems of low torque density and control precision of the existing permanent magnet brushless DC motor. The stator structure of the permanent magnet brushless DC motor includes stator teeth, stator slots and stator windings. The stator teeth include a number of armature teeth and auxiliary teeth. The width of the top and teeth, a number of armature teeth and a number of auxiliary teeth are spaced apart from each other in turn, a stator slot is formed between adjacent armature teeth and auxiliary teeth, the stator winding is embedded in the stator slot and each armature tooth Both are wound with a stator winding. The motor adopts the unequal tooth width design of the armature teeth and auxiliary teeth, which improves the winding coefficient of the motor. At the same time, by rationally designing the tooth width of the armature teeth and auxiliary teeth, the distribution of the magnetic density of the teeth is optimized to avoid saturation of the teeth and improve The output torque of the motor is improved, and the control accuracy of the motor is improved.

The invention provides an induction type magnetic suspension momentum sphere device. The device comprises a spherical rotor; a plurality of torque assemblies which are arranged outside the spherical rotor and are used for generating a rotating magnetic field; a plurality of suspension assemblies which are connected among the plurality of torque assemblies, wherein the suspension assemblies and thetorque assemblies are arranged at intervals, and two or more intersected closed loops are formed; and a controller. According to the induction type magnetic suspension momentum sphere device, two ormore intersected closed loops are formed by the torque assemblies and the suspension assemblies, and the structure is simple and reliable; each closed loop enables the edge position of each torque assembly to generate effective torque, the induced eddy current generated on the surface of the spherical rotor is more fully utilized, and the output torque can be increased; the torque assemblies and the suspension assemblies are arranged at intervals, a torque magnetic field and a magnetic suspension magnetic field act on different positions, and the risk of magnetic saturation is reduced; and thetorque assemblies and the suspension assemblies are relatively independent so that maintenance and replacement are easier when a fault occurs.

The invention discloses an oil tank oil level sensing mechanism and a sensor using the oil tank oil level sensing mechanism. The oil tank oil level sensing mechanism comprises a signal circuit moduleand a moving module which perform mutual induction. The signal circuit module comprises a circuit board assembly; a processing circuit assembly which is arranged on the circuit board assembly; an induction assembly which is arranged on the circuit board assembly, wherein the induction assembly is connected with the processing circuit assembly and the induction assembly and the moving module are inmutual induction; and an induction film which is arranged on the circuit board assembly and covers the induction assembly. The position signal precision is high and the resolution ratio is high; thecost is low and the structure is simple; the stability of the position signal of the sensor in a severe working environment is ensured; the induction film made of the soft magnetic material has the characteristics of low coercive force, low magnetic saturation density and high magnetic conductivity, the material can realize the maximum magnetization intensity or magnetic saturation by using the minimum external magnetic field and the fastest speed, and when the external magnetic field disappears, the material can be demagnetized at the fastest speed.

The invention discloses a loudspeaker assembly, an assembly method of the loudspeaker assembly and sound production equipment, the loudspeaker assembly comprises a first pole body, a first magnet anda second magnet, and the first magnet is arranged on the first pole body; the second magnet is arranged on the first pole body and is coaxial with the first magnet, and a gap is formed between the second magnet and the first magnet; a first protrusion is arranged on the side, facing the gap, of the first pole body. According to the loudspeaker assembly, the first protrusions are arranged on the first pole body so that the positioning and limiting effects can be achieved, the assembling efficiency can be improved, the height of the whole loudspeaker assembly can be reduced, and miniaturizationdesign of the loudspeaker assembly is facilitated. In addition, the thickness of the first pole body in the gap is increased due to the fact that the first pole body is provided with the first protrusions towards the gap, more magnetic energy can pass through the gap, hysteresis and magnetic saturation risks can be reduced, and the sound production quality of the loudspeaker assembly can be improved.

The present invention is a high efficiency permanent magnet machine capable of maintaining high power density. The machine is operable over a wide range of power output. The improved efficiency is due in part to copper wires with a current density lower than traditional designs and larger permanent magnets coupled with a large air gap. In a certain embodiment wide stator teeth are used to provide additional improved efficiency through significantly reducing magnetic saturation resulting in lower current. The machine also has a much smaller torque angle than that in traditional design at rated load and thus has a higher overload handling capability and improved efficiency. In addition, when the machine is used as a motor, an adaptive phase lag compensation scheme helps the sensorless field oriented control (FOC) scheme to perform more accurately.

The invention relates to a strong current short-circuit testing transformer with air gaps and an implementation method therefor. An air gap is formed in a lower transverse yoke between every two iron core limbs; the air gaps are filled with insulating plates; copper shield is mounted on a web plate corresponding to each air gap; the implementation method comprises the steps of fixing the copper shield on the inner side, corresponding to the position of each air gap, of the pre-processed web plate; horizontally placing a web plate with the copper shield on an iron core laminated plate platform; putting the insulating plates in a laminating process of iron cores, controlling the thickness of laminated sheets on the two sides of each air gap in the laminating process to be consistent and to be tightly adjacent to the corresponding insulating plates; placing a corresponding cushion block in the laminating process of the iron core sheets; after silicon steel sheets are laminated, mounting a web plate with the copper shield on the other side, and assembling a fastener on the corresponding iron core; and insulating an insulating pull band before erecting the corresponding iron core to ensure that the insulating plate in the air gap does not fall off when the corresponding iron core is erected. According to the transformer and the implementation method therefor, the iron core residual magnetism can be reduced; an iron core magnetic saturation phenomenon caused by excessive residual magnetism due to frequent short circuit of the testing transformer is lowered; and the output distortion of the test voltage and current waveform is avoided.