45results about How to "Strong resistance to demagnetization" patented technology

This invention relates to antipole permanent magnet, it consists of 2n+1 neodymium iron boron magnetic loop axial overlay. Geometry and magnetization direction of each loop are axial symmetry, their magnetization direction change along certain rule. The adjoint loop magnetization directions are 360 degrees per 2n different look from any axial cross section. Inner or outer air gap is magnetic workspace according to the different magnetic circuit. The 2n+1 loop are fixed by nonmagnetic metal inner and outer shells. There is no ferromagnetic part in the magnetic circuit, series structure is used, and the whole magnetic potential is the stacking of potentials provided by each loop. This invention can generate strong magnetic field with unchanging polar along circle direction. Its structure is simple, it's manufacturing and installation is simple. There is no ferromagnetic part, its weight is light. There is nearly no flux leakage, the anti demagnetizing action ability is strong, its adjustability is good.

The invention discloses a cylinder-typed permanent magnetic system, which is composed of axial direction leveling and periodical inner ring-shaped permanent array and outer ring-shaped permanent array at the same shaft. The sine waveshape periodical magnetic field is formed on random axial cross section of ring-shaped gap between inner and outer ring-shaped permanent magnetic arrays, which is composed of several equal radial thickness neodymium ferroboron magnetic ring axial gapless periodical superpositions, whose geometrical structure and magnetic direction possess axial symmetry and periodicity. The invention reduces gap magnetic resistance and axial component of gap magnetic density, which improves spatial distribution pattern of gap magnetic density and utility rate.

A position sensor system for determining a position of a sensor device relative to a magnetic structure, the system comprising: said magnetic structure comprising a plurality of poles; said sensor device comprising a plurality of magnetic sensors; the magnetic structure being movable relative to the sensor device, or vice versa; wherein: a distance between centres of adjacent poles varies along the movement direction; the sensor device is adapted: for determining a first magnetic field component parallel to, and a second magnetic field component perpendicular to a movement direction, and for calculating a coarse signal based on these components; and for determining a first and second gradient of these signals along the movement direction, and for calculating a fine signal based on these gradients; and for determining said position based on the coarse signal and the fine signal.

The invention discloses a self-starting permanent magnet motor provided with composite material starting conducting bars, which belongs to the technical field of permanent magnet motors. A rotor of the permanent magnet motor has a stamping type structure; a permanent magnet is arranged on the inner side of a rotor core, N and S magnetic poles are arranged alternately; a permanent magnet rotor adopts a magnetic pole structure of a U type, V type or mixed type magnetic circuit; composite material rat cage starting conducting bars are uniformly distributed close to the surface of the rotor core;and the composite material rat cage starting conducting bars is made of two types of materials including brass and copper-iron alloy. The brass is positioned on a middle part between the bottom part of a rotor groove and the upper part of the rotor groove; two side parts of the upper part of the rotor groove are made of the copper-iron alloy; or the middle part of the rotor groove is made of the brass, while the two sides of the rotor groove are made of the copper-iron alloy. Two ends of each composite material starting conducting bar are shorted out outside the rotor core through a welded brass end ring. Through the adjustment of the structure sizes of the brass and the copper-iron alloy materials, the obtained permanent magnet motor has a small starting current multiple and strong demagnetization resistance, can be started smoothly, and is suitable for workplaces requiring long-time continuous operation.

The invention provides a motor, a compressor and refrigeration equipment. The motor includes: a stator, the stator includes a stator core and windings, the stator core is provided with a plurality of stator convex teeth, and the winding is wound on a plurality of stator convex teeth; the rotor, the rotor includes a rotor core and a permanent magnet, and the permanent magnet is arranged on the rotor The iron core; the ratio of the number of stator teeth and the number of phases of the winding is configured to be suitable for adjusting the strength of the demagnetizing reverse magnetic field generated by electrifying the winding. By designing the ratio of the number of stator convex teeth to the phase number of the winding, the strength of the demagnetization reverse magnetic field generated by the electrification of the winding can be adjusted, so that even if the permanent magnet lacks heavy rare earth elements such as dysprosium and terbium, it can still increase the stator convex teeth. The ratio of the number to the number of winding phases is used to reduce the demagnetization reverse magnetic field generated by the winding energization, so that the demagnetization reverse magnetic field is not enough to demagnetize the permanent magnet, improve the overall anti-demagnetization ability of the motor, and then help to propose a method that meets the requirements of reducing weight. Rare earth elements can also ensure the motor's ability to resist demagnetization.

The invention discloses a stator partition type hybrid excitation motor with a built-in magnetic adjustment ring structure, which includes an outer stator, a rotor and an inner stator, the outer stator (1) and the rotor (2) are separated by an air gap, and the inner stator ( 3) and the rotor (2) are separated by an air gap; the outer stator (1) is evenly provided with 12 outer stator teeth along the circumferential direction, and the armature winding (4) is wound on the outer stator teeth; the inner stator (3) There are 12 inner stator teeth evenly arranged along the circumferential direction, and a centralized excitation winding (5) is wound on the inner stator teeth, and 12 permanent magnets (6) are evenly inserted into the inner stator yoke along the circumferential direction, and each permanent magnet is cut For magnetization, the inside of the inner stator (3) is evenly provided with 6 alternating magnetic bridges (7) connected to the magnetic adjustment ring (8); the intermediate rotor is composed of 7 magnetic adjustment blocks evenly placed. The invention realizes that the output torque can be adjusted up and down according to the requirement of the application occasion, and has superior flexibility.

The invention relates to a high-thrust tubular linear motor which comprises a stator shell, a stator and a rotor. The stator is coaxially and fixedly mounted in the stator shell, the rotor is coaxially and slidably mounted in an inner cavity of the stator, the stator comprises silicon steel sheets and windings which are arranged at intervals and fixedly mounted on the stator shell, the rotor comprises a rotor shaft, permanent magnets and magnetic conduction rings, and the permanent magnets and the magnetic conduction rings are arranged at intervals on the rotor shaft. The high-thrust tubular linear motor is characterized in that the rotor shaft is made of hollow soft magnetic materials, a copper tube is coaxially sleeved outside the rotor, the windings and the silicon steel sheets are fixedly mounted at intervals to form the stator, and the windings and the silicon steel sheets correspond to the permanent magnets and the magnetic conduction rings of the rotor. The high-thrust tubular linear motor is ingenious in design, reasonable in structure, large in starting force, fine in tightness and reliable in operation.