5results about How to "Avoid demagnetization" patented technology

The utility model discloses a coaxial electric driving device and a vehicle. The coaxial electric driving device comprises a shell, a rotor shaft, an output half shaft and a first sealing piece. Wherein the shell is provided with a first cooling liquid channel; the rotor shaft is provided with a hollow cavity and at least one liquid inlet hole formed in the peripheral wall of the rotor shaft, and the liquid inlet hole is communicated with the hollow cavity; the output half shaft is arranged in the hollow cavity in a penetrating mode and is coaxial with the rotor shaft, a gap is formed between the output half shaft and the cavity wall of the hollow cavity, the gap forms a second cooling liquid channel, the second cooling liquid channel is used for containing cooling liquid, and the second cooling liquid channel is communicated with the first cooling liquid channel through the liquid inlet hole; the first sealing piece is arranged at the end of the second cooling liquid channel and used for preventing the cooling liquid from flowing out of the second cooling liquid channel. According to the coaxial electric driving device, the rotor shaft and the rotor can be cooled in the small-size electric driving device, and the path is simple and easy to implement.

The utility model relates to a relay which comprises a movable contact component, arc extinguishing magnetic steel and an arc blocking piece. The arc extinguishing magnetic steel is arranged on the peripheral side of the movable contact part, and the arc blocking piece is arranged between the movable contact part and the arc extinguishing magnetic steel and used for blocking contact between the arc and the arc extinguishing magnetic steel. The arc extinguishing magnetic steel is arranged on the peripheral side of the moving contact component, and the magnetic field generated by the arc extinguishing magnetic steel can stretch the arc into a slender shape, so that the contact area between the arc and a surrounding medium can be increased, heat dissipation is accelerated, and cooling and extinguishing of the arc are realized. According to the relay, the arc blocking piece is arranged between the arc extinguishing magnetic steel and the movable contact component, and the arc blocking piece can block the arc, so that the arc can be prevented from being in contact with the arc extinguishing magnetic steel, the arc extinguishing magnetic steel is prevented from being demagnetized under the action of the high-temperature arc, arcing aggravation caused by demagnetization is avoided, and the failure time of the relay is prolonged.

This application relates to the field of motor technology and discloses a rotor stack and rotor. The rotor stack includes multiple first rotor laminations and second rotor laminations. The first and second rotor laminations respectively form multiple first and second magnet slots for accommodating magnets. The first and second magnet slots are axially offset and interconnected, such that the first sidewall of the first magnet slot abuts against the first sidewall of the magnet, and the sixth sidewall of the second magnet slot abuts against the second sidewall of the magnet. The distance between the first and sixth sidewalls is equal to the thickness of the magnet, thereby fixing the magnets without the need for resin potting in the magnet slots, reducing rotor production costs and improving rotor production efficiency. It also avoids magnet damage due to stress concentration. The gap formed between the sidewall of the magnet slot and the sidewall of the magnet constitutes part of the rotor cooling channel, allowing the magnets to be directly cooled by the cooling medium, avoiding demagnetization caused by high temperatures.

The utility model belongs to liquid pump technical field, including high temperature high pressure magnetic force pump body, semiconductor refrigeration mechanism, heat dissipation water tank, water level switch, alarm, bottom plate, circulating mechanism, circulating mechanism includes volute, impeller, shaft, high temperature high pressure magnetic force pump body and volute, heat dissipation water tank are fixedly installed on the bottom plate, and semiconductor refrigeration mechanism is fixedly installed in heat dissipation water tank outside one end, the outer shell outside of outer magnetic rotor and inner magnetic rotor of high temperature high pressure magnetic force pump body is fixedly installed with hollow heat dissipation shell, and heat dissipation shell is connected between volute and water tank, the utility model discloses a volute in the impeller of high temperature high pressure magnetic force pump body is powered, and the key part of high temperature high pressure magnetic force pump body is cooled for outer magnetic rotor or inner magnetic rotor through semiconductor heat dissipation mechanism, heat dissipation water tank, circulating water, and when the water is insufficient in heat dissipation water tank, can in time through the alarm prompt staff to add, effectively prevent the problem of outer magnetic or inner magnetic rotor demagnetization caused by temperature too high.

The utility model relates to the field of linear moving modules, and discloses a heat dissipation device and a linear module, the heat dissipation device comprises a containing groove formed in a sliding table, a plurality of fans and heat dissipation fins, and a plurality of ventilation holes are formed in the inner bottom surface of the containing groove in a penetrating mode; the fan is fixedly installed at the position, corresponding to the ventilation hole, of the inner bottom face of the containing groove, and the cooling fins are arranged on the inner bottom face of the containing groove. The containing groove is formed in the sliding table, the ventilation holes corresponding to the fans are formed in the inner bottom face of the containing groove, the distribution structure of the heat dissipation fins is combined, the fans can rapidly extract hot air around the motor rotor through the ventilation holes, meanwhile, the heat exchange area of the sliding table and air is increased through the heat dissipation fins, and the heat dissipation efficiency is improved. Multiple heat dissipation paths are achieved in a limited space, concentrated heat loads generated during operation of the motor rotor are effectively restrained, and the phenomena of electromagnetic performance attenuation and permanent magnet demagnetization caused by temperature rise are avoided.