37results about How to "Improve air gap flux density waveform" patented technology

The invention relates to a magnetic pole structure of a permanent magnet synchronous direct-driven motor. The magnetic poles are embedded in the circumference of the surface of a rotor in a manner that an N pole and an S pole are alternated, and are opposite to a stator; and a layer of air gap is arranged between the stator and the rotor. The stator comprises an iron core and a winding; and the rotor is of a hollow shaft structure or a solid shaft structure. The magnetic poles of the rotor adopt the magnetic poles with unequal thicknesses, and are uniformly distributed around the surface of the rotor of the motor, so that a no-load magnetic flux density waveform of the air gap is approximate to a sine wave. According to the magnetic pole, a design idea of an inverse problem of an electromagnetic field is adopted, the centers of the magnetic poles with equal thickness are used as a symmetrical axial line, and the thicknesses on two ends of the magnetic poles are gradually reduced, so that an initial scheme of the magnetic poles with unequal thicknesses is obtained. Electromagnetic field software simulation is utilized to obtain the magnetic flux density waveform of the air gap, a fundamental wave and a harmonic component are analyzed, partial size of each magnetic pole is adjusted according to design requirements, and multiple replication is carried out until a design goal is optimized. Due to the adoption of the magnetic pole structure, the vibration and the noise of the permanent magnet synchronous direct-driven motor can be reduced.

The invention mainly relates to a stator punching structure of a permanent magnet motor, and belongs to the technical field of permanent magnet motors. The air-gap magnetic flux density waveforms are optimized by cutting angles from two ends of a stator tooth; the ratio of a distance between two start points of each cut angle at a tooth part to the angle and the ratio of each stator tooth to the angle are set within a range of 0.4-0.6; the angle theta of each cut angle is set within a range of 5-15 degrees. According to the structure, the harmonic content of the air-gap magnetic flux density is reduced, loss and vibration noise of the motor are reduced, and the performance of the motor is improved. The punching structure is simple, is convenient to manufacture, is lower in cost and is suitable for popularization and application.

The invention relates to a high-precision low-fluctuation permanent magnetic brushless servomotor for a solar tracking system, which comprises a machine shell as well as a stator and a rotor in the machine shell, wherein the stator comprises a stator core fixed on the inner wall of the machine shell and a stator winding; the rotor comprises a main shaft and a rotor core; the outer circumference of the rotor core is sleeved with an annular magnetic pole consisting of radial magnetized magnetic steels which are evenly arranged along the circumferential direction and adjacent oblique angled magnetized magnetic steels; one radial magnetized magnetic steel and two adjacent oblique angled magnetized magnetic steels in the annular magnetic pole form a rotor magnetic pole; the radial magnetized magnetic steels are main magnetic poles; and the two adjacent oblique angled magnetized magnetic steels on both sides are auxiliary magnetic poles. Radial and oblique angled mixed anisotropic magnetized magnetic poles in the annular magnetic pole of the rotor ensure that the motor can also remarkably improve air gap flux density waveform of the motor even if the even air gap is adopted, obtain a sinewave magnetic field, does not reduce power output, can also reduce moment fluctuation, and improve the precision of the solar tracking system. The motor can perform steady operation with high efficiency, low fluctuation, low noise, quick response and high precision.

The invention discloses a built-in permanent magnet synchronous motor, relates to the technical field of a motor and aims to solve the technical problem of improving the comprehensive quality of the motor. Multiple permanent magnet slots are axially and symmetrically arranged in a rotor of the motor along the central axis of the rotor at intervals, three permanent magnets distributed in an arc band shape are arranged in each permanent magnet slot, wherein one permanent magnet is a middle steel magnet, and the other two permanent magnets are side steel magnets; the built-in permanent magnet synchronous motor is characterized in that each middle steel magnet adopts the normal magnetization vertical to the surface of the steel magnet, and each two side steel magnets in one slot adopt the non-normal magnetization, so that the arc center of a magnet arrangement arc of each permanent magnet slot is enabled not to coincide with the magnetization orientation point of permanent magnets in the corresponding permanent magnet slot. According to the motor provided by the invention, the comprehensive quality of the motor is greatly improved.

The invention relates to the technical field of motors, and especially relates to a hollow cup structure motor with a sunflower-shaped inner rotor. The coreless structure motor with the sunflower-shaped inner rotor comprises an outer rotor iron core, a plurality of permanent magnets, an eccentric inner rotor iron core and a rotor shaft. Along the radial cross section of the rotor shaft, the external contour of the eccentric inner rotor core comprises a plurality of eccentric arcs protruding towards the permanent magnets, the number of the eccentric arcs is consistent with that of the permanent magnets, and the eccentric arcs are in one-to-one correspondence with the permanent magnets. The two end points of the eccentric arc are located on the connecting line of the two side edges of the corresponding permanent magnet and the center of the rotor shaft, and the circle center of the eccentric arc is located on the connecting line of the middle point of the arc edge of the corresponding permanent magnet and the center of the rotor shaft, so that the air-gap flux density waveform of the motor is improved, the harmonic content in an air-gap magnetic field is reduced, and the air-gap magnetic field approaches sine waves, therefore, the back electromotive force waveform of the coreless motor is improved, the torque pulsation is reduced, and the performance of the motor is improved.

The invention discloses a rotor of a permanent magnet motor, the permanent magnet motor and a compressor. The rotor includes a rotor iron core and a plurality of permanent magnets. The rotor iron coreis provided with a center hole and a plurality of magnet slots. The plurality of magnet slots are arranged in the circumferential direction of the center hole. Each of the magnet slots extends in theradial direction of the center hole. Portions, located at the two ends of each of the permanent magnets in the radial direction, of each of the magnet slots form first magnetic isolation slots. The rotor iron core is provided with a second magnetic isolation slot on at least one side of each of the magnet slots in the circumferential direction. Each second magnetic isolation slot separates a single-sided area where the second magnetic isolation slot is located into a plurality of magnetic field pathways distributed in the radial direction. In two magnetic field pathways adjacent in the radialdirection, the minimum width of the magnetic field pathway located on the outer side in the radial direction is smaller than the minimum width of the magnetic field pathway on the inner side in the radial direction. According to the permanent magnet motor of the embodiment of the invention, the magnetization characteristics of the rotor iron core are improved, and noises of the permanent magnet motor are reduced.

The invention discloses an inclined pole magnetic bush for an electric machine and an electric machine rotor and an electric machine having the same, The oblique pole magnetic tile comprises: a body that extends obliquely with respect to an axial direction of the motor, the axis of symmetry of the radial section of the body intersects and is perpendicular to the central axis of the motor, and theradial outer side edge of the radial section is formed into an arc which is eccentrically disposed with the center of the motor and has a bending radian greater than that of the radial inner side edge. The inclined pole magnetic bush according to the embodiment of the invention can obviously improve the vibration, noise, loss and the like of the motor, and improve the performance of the motor.

The invention discloses a linear and rotary motion converter for a V-type magnetic pole. According to the linear and rotary motion converter, linear motion and rotary motion can be mutually converted, and kinetic energy transfer can be achieved. The converter comprises a rotary unit, a linear unit and a magnetism adjusting mechanism. The rotary unit comprises a rotating shaft, a rotor core and a permanent magnet, wherein the permanent magnet is of a segmented V-type structure and is pasted on the surface of the rotor core. The linear unit comprises a mover yoke and a permanent magnet. The magnetism adjusting mechanism is composed of permeable magnetism adjusting iron blocks and fixed between the rotary unit and the linear unit. As the rotary unit is of a novel magnetic pole structure, the torque pulsation of the converter is effectively reduced, jitter and loss of the converter are reduced, and the stability and energy conversion efficiency of the converter are improved. Meanwhile, the V-type magnetic pole is centrosymmetric, so that axial magnetic pulls are mutually offset, the operational reliability of the converter is improved, and the service life of the converter is prolonged.

A permanent magnet synchronous motor with a limited rotation angle belongs to the technical field of synchronous motors, and comprises a base 1, a permanent magnet 2 and an end cover 3, a bearing 4, arotating shaft 5, an armature core 6 and an armature winding 7; the base 1 is connected with the end cover 3; the permanent magnet 2 is mounted on the inner side of the base 1, and the base 1, the permanent magnet 2 and the end cover 3 integrally form a stator; the rotating shaft 5 is connected with the end cover 3 through the bearing 4; the armature core 6 sleeves the rotating shaft 5; a grooveis formed in the armature core 6, the armature winding 7 is installed in the groove, and the rotating shaft 5, the armature core 6 and the armature winding 7 integrally form a rotor. The armature core6 is located in the permanent magnet 2, and a gap is arranged between the armature core 6 and the permanent magnet 2. The motor is small in size, high in torque density, low in rotating speed and high in efficiency.

The invention provides a rotor, a motor, a compressor and refrigeration equipment. The rotor comprises: a rotor core which is provided with an installation groove; a permanent magnet arranged in the mounting groove and forms a magnetic pole; a plurality of slits are arranged on the rotor iron core at one side, far away from the axis of the rotor iron core, of the mounting groove, wherein the minimum distance between two adjacent slits in the plurality of slits is L2, the plurality of slits comprise at least one first slit, the minimum value L1 of the width of the first slit is arranged betweentwo end parts of the first slit along the length direction, and L2 is greater than or equal to 0.5 time L1. According to the rotor provided by the invention, the sizes of the end parts, close to theouter wall of the rotor core, of the first slits and the end parts, close to the mounting grooves, of the first slits are relatively large, the influence of a stator armature magnetic field on a rotormagnetic field is prevented, the mechanical performance of the rotor is improved, the distance between two adjacent slits can be ensured to be within a reasonable range, and flux loss reduction is benefited.

The invention relates to the technical field of generators, and particularly discloses a sine wave rotor based on a permanent magnet and inner rotor iron core eccentric structure design, which comprises an outer rotor iron core, a plurality of eccentric permanent magnets, an inner rotor iron core and a rotor shaft. The plurality of eccentric permanent magnets are alternately arranged along the radial inner side of the outer rotor iron core, every two adjacent eccentric permanent magnets are opposite in magnetizing direction, each eccentric permanent magnet is composed of an arc edge outer contour, an eccentric arc inner contour and two side edges, the inner contour of the inner rotor iron core is circular, the outer contour is composed of a set of eccentric arcs protruding outwards, and an annular air gap is formed between the radial outer side of the inner rotor iron core and the eccentric permanent magnets. The sine wave rotor designed based on the permanent magnet and the inner rotor core eccentric structure is adopted, the air-gap flux density waveform of the energy storage flywheel generator is improved, the harmonic content in an air-gap magnetic field is reduced, the air-gap magnetic field is made to be close to sine waves, the counter electromotive force waveform of the generator is improved, torque pulsation is reduced, and the performance of the energy storage flywheel generator is improved.

The invention relates to the technical field of generators or motors, and particularly discloses a square wave rotor designed based on a outer rotor iron core eccentric structure design. The square wave rotor comprises an outer rotor iron core, permanent magnets, a stator, an inner rotor iron core and a rotor shaft, the radial outer side of the outer rotor iron core is installed at the outer end of the rotor shaft, the radial inner side of the inner rotor iron core is installed at the inner end of the rotor shaft, the permanent magnets are tile-shaped, and the permanent magnets are alternately arranged along the radial outer side of the inner rotor iron core. The magnetizing directions of every two adjacent permanent magnets are opposite, the outer contour of the outer rotor iron core is round, the inner contour of the outer rotor iron core is composed of a plurality of eccentric arcs in the circumferential direction, the number of the eccentric arcs is the same as that of the permanent magnets, and annular air gaps are formed between the radial inner side of the outer rotor iron core and the permanent magnets. After the outer rotor core eccentric structure design is adopted, the air-gap flux density waveform of the motor is effectively improved, and an air-gap magnetic field is close to a square wave, so that the back electromotive force waveform of the motor or a generator is improved, the torque pulsation is reduced, and the motor performance is improved.

The invention mainly aims to provide a rotor structure, a motor and a compressor. The rotor structure comprises a rotor iron core and a plurality of permanent magnets arranged on the rotor iron core so as to form a plurality of magnetic poles on the rotor iron core, wherein the plurality of magnetic poles comprise a plurality of N poles and a plurality of S poles which are alternately arranged along the circumferential direction of the rotor iron core, at least one magnetic pole of the rotor iron core is provided with a magnetic isolation hole, the magnetic isolation hole comprises a first hole body part, a second hole body part and a third hole body part which are communicated with one another, the second hole body part and the third hole body part are respectively arranged at two ends ofthe first hole body part along the direction far away from the axis of the rotor iron core, and in the circumferential direction of the rotor iron core, the second hole body part and the third hole body part protrude out of the first hole body part. By means of the arrangement, the problem that in the prior art, vibration noise of a motor is large is solved.