7results about How to "Uniform air gap" patented technology

The invention relates to the technical field of motors, in particular to a magnetic self-centering motor assembling method which is applied to a motor and comprises the following steps: forming a rotor assembly; a rotor assembly is rotatably and preliminarily installed on a base through a rotating shaft assembly, an end cover is preliminarily installed on the base, a bearing chamber of the end cover supports an outer ring of a bearing on the rotating shaft assembly through a radial elastic supporting unit, and the radial elastic supporting unit allows the outer ring of the bearing to slightly and radially float; a driving current is applied to the stator assembly, so that the rotor assembly generates a rotation trend or rotates at a low speed, and the rotor assembly is driven to overcome the micro radial rigidity of the radial elastic supporting unit by utilizing the unbalanced magnetic pulling force of interaction between the rotor assembly and the stator assembly; and the rotation axis of the stator assembly is automatically adjusted to a position which tends to be coaxial with the central axis of the stator assembly. The method can actively compensate radial dimension chain errors and assembly deviations accumulated in the previous process.

The utility model belongs to the technical field of brushless motors, in particular to a plastic shell motor structure, which comprises a rotor, a stator and a plastic shell integrally formed by injection molding, the radial section of the plastic shell is W-shaped, and the plastic shell comprises an outer shell part and an isolation part which completely isolate the rotor from the stator. An opening for assembling the rotor and the stator is formed in one side, opposite to the isolation part, of the shell part; when the stator and the rotor are fixed by the plastic shell, the stator and the rotor are separated, due to the rigid design of the plastic shell, accurate positioning of the stator and the rotor can be ensured, uniform air gaps between the stator and the rotor are ensured, and vibration, noise and efficiency reduction caused by eccentricity are avoided; the plastic shell can enhance the insulation grade and can meet the double insulation design, and the power can be higher under the same condition; even if more enameled wires are wound on the stator to increase the power of the motor, the stator still meets the safety requirement of the electrical clearance, so that the motor can safely operate under higher power.

The utility model discloses a rotor iron core manufacturing device of an external rotor motor, which belongs to the technical field of rotor iron cores of external rotor motors and comprises a blank, an expansion sleeve and an expansion core. The blank is arranged on the outer side of the expansion sleeve in a sleeving mode, the expansion sleeve comprises a plurality of petal blocks arranged in a circular ring shape, and the side faces, close to the inner circumferential face of the blank, of the petal blocks are jointly matched to form a circular circumferential face. And the expansion core expands and supports the plurality of petal blocks from inside to outside. According to the utility model, the inner diameter of the blank can be expanded to form the finished iron core by arranging the annular blank and utilizing the matching of the expansion sleeve and the expansion core, and the whole finished iron core is free of welding spots, so that the structural strength of the finished iron core is guaranteed, and the material cost is reduced; and meanwhile, the inner circumferential surface of a finished product after the diameter of the blank is expanded is still a complete circumferential surface, so that the rotor magnetic steel can be tightly attached to the inner circumferential surface of an iron core of the finished product, the air gap of the rotor is homogenized, and the prominent problems of torque pulsation, abnormal vibration noise and the like are solved.

The utility model discloses a kind of tensile tear-resistant reinforced CPVC cable protection pipe, it includes pipeline, the inside fixed connection of pipeline has CPVC resin, the inside fixed connection of CPVC resin has nano calcium carbonate, the inside fixed connection of nano calcium carbonate has calcium-zinc stabilizer.Through the above structure, there is a layer of CPVC resin in pipeline, the smooth surface of CPVC resin can reduce the contact area of cable and pipe wall, reduce the local temperature rise caused by heat generation due to friction, while the air gap between pipe wall and cable is more uniform, beneficial to the heat dissipation of cable operation, prolong the service life of cable, there is also a layer of nano calcium carbonate in it, nano calcium carbonate particle size is usually 10~100nm, specific surface area is large and dispersibility is good, uniformly filled in CPVC resin matrix can form "rigid particle reinforcing effect", the tensile strength of inner wall layer is improved by 20%~30%, and bending modulus is improved by 15%~25%.

The utility model provides a kind of stress groove structure, motor stator, motor and compressor, it is related to compressor technical field, solve the technical problem that the stator outer circle and compressor shell interference fit in prior art make that stator core stress increases and leads to core iron loss increase, influence compressor performance.The stress groove structure is arranged on stator lamination, the stress groove structure includes left groove wall, right groove wall and groove bottom, the both ends of the groove bottom are connected between the left groove wall bottom end and the right groove wall bottom end, the left groove wall and the right groove wall are N layer dentiform groove structure, 2 < N < 5.The utility model is used to provide a kind of stress groove structure, motor stator, motor and compressor for improving compressor performance and reducing noise.

The invention discloses a method for compensating air gap inconsistency of an axial flux motor based on preset deformation. The method comprises the following steps: (1) obtaining the magnetic pole area Sm of a permanent magnet; (2) establishing a data model of the magnetic flux force F and the air gap g; (3) establishing a data model of rotor yoke deflection f and magnetic flux force F; (4) according to the permanent magnet magnetic pole area Sm in the step (1), the data model of the magnetic flux force F and the air gap g in the step (2) and the data model of the rotor yoke deflection f and the magnetic flux force F in the step (3), deducing the relation between the air gap f and the rotor yoke deflection g; (5) correcting the deflection f of the rotor yoke in processing parameters, and processing the rotor yoke with pre-deformation; and (6) the axial magnetic flux motor with the pre-deformation rotor yoke is powered on to operate, and under the acting force of magnetic flux force, the rotor yoke deforms reversely, so that air gaps are kept consistent and uniform in the power-on operation process. According to the invention, the air gap change value is accurately predicted, and the air gap uniformity is ensured.

The application discloses a manganese-zinc ferrite and a preparation method thereof, and the method comprises the following steps: mixing manganese-zinc ferrite powder and a polyvinyl alcohol solution to obtain a mixture, and grinding the mixture; performing a compression molding treatment on the ground mixture to obtain a compression molding product; and performing a sintering treatment on the compression molding product to obtain the manganese-zinc ferrite; wherein the sintering treatment comprises a temperature rising treatment stage, and the temperature rising treatment stage comprises a plurality of temperature rising stages, at least two of which have different temperature rising rates. The manganese-zinc ferrite prepared by the application can have a high saturation magnetic flux density and a low residual magnetism while keeping a low loss at a high frequency, that is, the manganese-zinc ferrite with a large magnetic induction intensity change amount is prepared.