65results about How to "Avoid magnetic flux leakage" patented technology

The invention discloses a composite permanent-magnet rotor for a permanent-magnet motor and a manufacturing method thereof. According to the invention, firstly, a magnetically-conductive shaft sleeve made from a magnetically-conductive material is sleeved on a rotor shaft; then, rotor cores are made into sectors, and the sectorial rotor cores are evenly distributed, mounted and fixed on the magnetically-conductive shaft sleeve; the other five surfaces of each sectorial rotor core mounted and fixed on the magnetically-conductive shaft sleeve except the upper end surface in the shape of a circular arc are all pasted and surrounded by permanent-magnet blocks made from magnetically-conductive materials, and each permanent-magnet block has the same polarity as the magnetic pole of the faying surface of each sectorial rotor core; the sectorial rotor cores and the permanent-magnet blocks are clamped and fixed on the magnetically-conductive shaft sleeve through annular end pressing plates fixed at both ends of the magnetically-conductive shaft sleeve; and the annular end pressing plates are made from magnetically-conductive materials. The composite permanent-magnet rotor has the advantages of compact structure, low flux leakage at axial end parts, high utilization rate of magnetic efficiency of permanent magnets, strong immunity from interference, stable working performance, high rotor strength, long service life and the like.

A radial rotor structure for a permanent magnet synchronous motor comprises a rotating shaft, a rotor core, permanent magnets, rotor pole shoes, a left end-plate and a right end-plate, wherein a plurality of rotor baffles are arranged between the two end-plates; the rotor pole shoes are independent of one another and distributed at intervals together with the rotor baffles; the rotor baffles axially divide a rotor into a plurality of rotor units; two end surfaces of the rotor pole shoes in each rotor unit are respectively clung to the end surfaces of the adjacent rotor baffles; one rotor pole shoe in each rotor unit corresponds to one permanent magnet; the rotor baffles are circular ring-shaped; the rotor core and the permanent magnets penetrate the circular through holes in the rotor baffles; a plurality of supporting wing plates are uniformly distributed on the outer side surface of the rotor core and are in clearance fit with the rotor baffles; and draw-in bolts penetrate the left end-plate, the rotor pole shoes, the rotor baffles and the right end-plate and axially lock the left and the right end-plates, as well as the rotor pole shoes and the rotor baffles, which are arranged between the left and the right end-plates. The radial rotor structure for the permanent magnet synchronous motor has the advantages of high mechanical strength and suitability for motors rotating at high speed.

The invention discloses a gyromagnetic therapy machine, and belongs to the field of medical equipment. Magnets with opposite polarities are fixed on opposite surfaces of an upper turn plate (2) and a lower turn plate (3), the lower turn plate (3) is connected with a motor (4), the motor (4) and a therapy bed (6) are connected with a control circuit, and the upper turn plate (2) is fixed in a bearing block (7) through the rotation of a rotation shaft (11) on the upper side of the upper turn plate (2). The gyromagnetic therapy machine is characterized in that the upper part of a rack (1) is provided with an upper fixing plate (9) and a lower fixing plate (5), a lower fixing hole (501) is formed in the middle part of the lower fixing plate (5), the lower end of the bearing block (7) is integrally provided with a flange (701), the flange (701) is fixed on the lower end face of the lower fixing plate (5), the upper end of the bearing block (7) is fixedly connected with the upper fixing plate (9) after passing through the lower fixing hole (501), and the bearing block (7) and the upper turn plate (2) are integrally arranged on the rack (1) from bottom up. The gyromagnetic therapy machine has the advantages of convenience to install, simple structure, reliable operation and the like.

The invention belongs to the field of energy collection, in particular to a vibration energy harvester based on a variety of magnetic phase change alloys, including: Heusler-type alloys and MnCoSi-based alloys are respectively vertically fixed at both ends of the lower yoke, and permanent magnets are fixed on the lower magnetic yoke. The middle of the yoke; the upper end of the permanent magnet is provided with a buffer layer, and the upper part of the Heusler-type alloy, MnCoSi-based alloy and the buffer layer is provided with an upper yoke, and the upper and lower yokes are wound in the range between the two permanent magnets. The two ends of the coil Connect the rectifier circuit and capacitor. The vibration energy harvester of the present invention adopts Heusler-type alloy and MnCoSi-based alloy as the core components of the device, utilizes the magnetic sensitivity of Heusler-type alloy and MnCoSi-based alloy to stress, and realizes weak magnetic / ferromagnetic state and antiferromagnetic / ferromagnetic state At the same time, the magnetic yoke is used to realize the transmission of the magnetic force lines in the complete magnetic circuit, so that the magnetic flux leakage phenomenon in the device is avoided, and the change of the magnetic flux is effectively increased to improve the energy conversion efficiency.