3results about How to "Increase field strength" patented technology

The utility model discloses a high-torque-density magnetic transmission speed reducer and a built-in motor of a power-assisted bicycle, and belongs to the power-assisted technology of bicycles. A magnetic transmission speed reducer and a motor in the prior art have the defects of large torque fluctuation, low transmission efficiency, easy magnetic field mismatch, uncontrollable eddy current loss and the like, the magnetic transmission speed reducer comprises a first stator, a first rotor and a modulation ring, the modulation ring is located between the first rotor and the first stator, a first air gap is kept between the modulation ring and the first stator, and a second air gap is kept between the modulation ring and the second stator. A second air gap is kept between the modulation ring and the first rotor, the modulation ring comprises modulation teeth, the total number of the modulation teeth is p2, the number of pole pairs of the first stator magnetic ring is p3, the number of pole pairs of the first rotor magnetic ring is p1, p1 = p2-p3, a magnetic field of the first air gap is coupled with a magnetic field of the second air gap, and rotation from the first rotor is output in a speed reduction mode through the modulation ring. The motor part and the reduction gear realize transmission through magnetic force, thereby improving the motor operation efficiency and reducing the overall noise of the motor.

The application relates to the technical field of graphene, in particular to a graphene material and a preparation method and a preparation device thereof, the preparation method comprises the following steps: preparing an electrolysis system, including an anode, a cathode and an electrolyte, a first extension direction of the anode intersects with a second extension direction of the cathode; graphite is used as the anode to perform an electrolysis reaction, and the graphite is driven to move along the first extension direction to adjust the distance between the anode and the cathode; as the distance between the anode and the cathode decreases, the current density on the surface of the graphite gradually increases; the graphite is first subjected to electrochemical intercalation and then subjected to electrolytic exfoliation to obtain a graphene dispersion liquid; the graphene dispersion liquid is subjected to purification treatment to obtain graphene. In the preparation method, the electrochemical intercalation and the electrolytic exfoliation reaction on the graphite are performed in sequence, the prepared graphene material has a high few-layer (carbon layer number is less than or equal to 5) rate, and the types and contents of oxygen-containing functional groups can be controlled.

This application discloses a voltage equalization enclosure and a gas insulation device for conductor connection in the field of power equipment technology. The voltage equalization enclosure is used for the interconnection of busbars and includes an end face and a smooth outer surface formed by a side face with rotational symmetry. The outer surface is a conductor. The side face and the end face are smoothly transitioned. The end face has more than one slot, and all slots are connected at the geometric center of the side face. The slot is used for the insertion and overlapping of busbar connectors. The side face has fastener mounting holes in a direction perpendicular to the overlapping surface of the busbar connectors. After fastening, the fasteners are submerged in the side face. The outline of the slot on the end face is a smooth curve. This solution solves the problem that the insulation performance of the existing conductor connection structure is not suitable for environmentally friendly insulating gases with weak insulation performance. It achieves the beneficial effects of uniform electric field, improved insulation performance between parts, and the use of multiple conductor structures.