■ Product overview

The utility model discloses a permanent magnet external rotor electric drum, which relates to the technical shame of logistics sorting equipment, and comprises a cylinder, a fixed shaft and a magnetic encoder. The inner wall of the cylinder is coaxially provided with a magnetic ring and a plurality of permanent magnets distributed at intervals along the circumferential direction. The fixed shaft is coaxially penetrated inside the cylinder and rotatably connected with the cylinder. The fixed shaft is fixed with a stator and a magnetic encoder, which are opposite to the permanent magnet in the radial direction of the cylinder, and the magnetic encoder is arranged close to the magnetic ring. In this utility model, the magnetic encoder senses the position of the magnetic pole on the magnetic ring, and the upper magnetic pole is continuous without gap, while the magnetic encoder senses the magnetic pole of the magnetic ring without gap, so that it can realize quick start and quick stop, accurately control the rotating speed of the cylinder and the conveyor belt that is long enough to be wound on the cylinder during rotation can transport the package in place.

■ Working principle of linear motor

When the AC power supply is connected to the primary winding, the traveling wave magnetic field will be generated in the air gap, and the secondary winding will be cut by the traveling wave magnetic field to induce electromotive force and generate current, which will interact with the magnetic field in the air gap to generate electromagnetic thrust. If the primary is fixed, the secondary moves in a straight line under the action of thrust; On the contrary, the primary does linear motion. According to customer demand, the power is 3.5KW and 5.5KW respectively.