Sealing device and method of permanent magnet of outer rotor permanent magnet motor

Abstract

The invention relates a sealing device and method of a permanent magnet of an outer rotor permanent magnet motor. The sealing device is provided with a mold core which is provided with a hollow cylinder, a positioning shaft and an electric heating element, wherein more than one paraffin injection port and more than one sealing resin injection port are arranged on the upper end face of the hollow cylinder; and more than one vacuumizing conduit outlet is arranged on the side wall of the hollow cylinder. The sealing method comprises the following steps of: fixing glass fiber cloth on the permanent magnet of an outer rotor by using a ferromagnetic adsorption ring; closing the mold core by using paraffin or other low melting point substances; and sealing the permanent magnet of the outer rotor permanent magnet motor by using vacuum filling sealing resin. The invention effectively improves the sealing quality of the permanent magnet and the work efficiency for vacuum filling. The cylindricity of an inner circle of the sealed outer rotor can be met, so that workpieces which are manually filled with the sealing resin are hardly trimmed and the workload and the labor intensity of operators can be greatly reduced.

Description

technical field [0001] The invention relates to a sealing device and a sealing method for a permanent magnet of an outer rotor permanent magnet motor. Background technique [0002] Permanent magnet poles are installed on the inner wall of the outer rotor of the outer rotor permanent magnet motor. In order to improve the firmness of the installation of the magnetic poles and prevent damage to the permanent magnets, sealing resin should be poured into the gaps between the permanent magnet poles. On the upper surface of the permanent magnets A protective glass fiber cloth should be attached to seal the permanent magnet on the inner wall of the rotor as a whole. The permanent magnet is sealed by using the method of vacuum infusion sealing resin, which can better ensure the sealing quality of the permanent magnet. When sealing, a closed space must first be formed between the permanent magnet and the inner wall of the outer rotor, and the sealing resin can be poured into the clos...

AI Technical Summary

Problems solved by technology

The commonly used vacuuming method is to manually stick an airtight diaphragm on the surface of the permanent magnet. However, due to the large volume of the workpiece, the airtight diaphragm needs to be spliced ​​in multiple places. If the specified requirements are not met, it is impossible to ensure that the sealing resin fills all the gaps. In addition, because the airtight diaphragm cannot be tightly attached to the workpiece, the sealing resin flows downward under the action of gravity, and the local cylindricity inside the workpiece may not reach To meet the specified requirements, it often takes a lot of time to measure and remove the excess sealing resin after pouring the sealing resin

[0003] The Chinese patent CN101572461A "Method for sealing the permanent magnet of the rotor of the generator and the rotor of the generator" previously applied for discloses a method for sealing the permanent magnet of the rotor of the generator, the method is to put the end barrier The parts are arranged on the vacant part of the rotor yoke; the permanent magnets and spacers are wrapped with a sheet of non-magnetic material that covers the entire length of the rotor, including the end barriers; the airtight diaphragm is arranged on the outside of the sheet, and seal it against the end of the rotor yoke so that the diaphragm and rotor yoke together form a hermetic enclosure; apply a vacuum to the hermetic enclosure between the diaphragm and rotor yoke; pour resin into the In the airtight envelope; and to solidify the resin, this method is only suitable for the vacuum infusion of the sealing resin of the permanent magnet of the inner rotor permanent magnet motor, and the vacuum degree in the airtight envelope is difficult to be guaranteed

Images