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.

A hub dynamo is compacted into a small diameter size while ensuring the generation of a high voltage of electric power. A coil chamber CR formed between a pair of main iron cores 10 is partitioned in the axial direction by three sub iron cores 11 to form a first, second, third and fourth coil chambers (CR-1, 2, 3 and 4); on these coil chambers (CR-1, 2, 3 and 4), one coil wire 13 is wound in order in a state that the winding direction changes alternately; and magnetic flux collectors 15 connected with the outer circumference of the main / sub iron cores 10 and 11 include a first magnetic flux collector 15 connected with the first, third and fifth iron cores (10-1), (11-3) and (10-5) and a second pole piece 15 connected with the second and fourth iron cores (11-2), (11-4), which are disposed alternately.

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.

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.

An automotive generator that includes a Lundell rotor. First and second protruding portions are disposed so as to project from inner wall surfaces of portions of first and second yoke portions at root portions of first and second claw-shaped magnetic pole portions, and first and second recess portions are recessed into inner wall surfaces of portions of the first and second yoke portions that face the second and first protruding portions. In addition, a shape of a region in which the field coil is disposed is configured into a wave shape that has a cross-sectional shape in a plane that includes a central axis of the pole core that is approximately constant in a circumferential direction and that zigzags alternately in an axial direction at positions of each of the first and second claw-shaped magnetic pole portions.

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.

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 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 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.

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 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 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.

Provided are: a magnetic metal containing resin which can ensure less susceptibility to magnetic saturation and which has such heat shock resistance as to tolerate the heat due to the application of a DC bias or the atmospheric temperature; and a coil component and an electronic component, using the same. This magnetic metal containing resin comprises 70 to 88 mass% of a magnetic metal powder and at least 5.0 mass% of an oxide, and is characterized in that the mean particle diameter of the oxide is 2.8mum or more. It is preferable that the oxide content of the magnetic metal containing resin is 10 mass% or more. Further, it is preferable that the mean particle diameter of the oxide is in a range including 5.5mum. The magnetic metal containing resin makes it possible to produce a coil component and an electronic component which are less susceptible to magnetic saturation and which are resistant to thermal shocks.

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.