Integrated DC brushless limited angle torque motor rotor magnetic steel enclosing structure and method

Abstract

The invention relates to an integrated DC brushless limited angle torque motor rotor magnetic steel enclosing structure and method. The structure includes rotor magnetic steel, a protective cover, andan end face gland. The protective cover is made of a light non-magnetic material and is solid of revolution structure having an L-shaped bus shape. The end face gland is made of the light non-magnetic material and is a ring-shaped structure with a rectangular cross section. The inner circumferential surface of the rotor magnetic steel is bonded to the outer circumferential surface of a rotor core. The rotor magnetic steel and the rotor core are press-fitted in the protective cover. The outer circumferential surface and one end face of the rotor magnetic steel are bonded to the inner wall surface of the protective cover. The end face gland is press-fitted into the protective cover from the open end of the protective cover. The inner end of the end face gland is bonded to the other end faceof the rotor magnetic steel, so that the rotor magnetic steel is enclosed in an enclosed annular space delimited by the inner wall surface of the protective cover, the outer circumferential surface of the rotor core, and the inner end surface of the end face gland. The enclosing structure and method completely wrap and enclose the magnetic steel so as to isolate the magnetic steel from the external environment and slow down the corrosion of the magnetic steel.

Description

technical field [0001] The invention belongs to the motor assembly technology, and relates to the protection technology of the motor rotor magnetic steel, in particular to a closed structure and method for the rotor magnetic steel of an integral DC brushless limited-angle torque motor. Background technique [0002] NdFeB magnet is an important part of DC brushless limited angle torque motor, which provides permanent magnet source for the motor. The NdFeB magnetic steel material contains a large amount of neodymium and iron, which is easily corroded and reduces the magnetic performance of the magnetic steel and the reliability of the motor. Common anti-corrosion methods for magnetic steel are to coat the surface of the magnetic steel with a protective layer and to seal the magnetic steel with mechanical parts. For the method of coating the protective layer on the surface of the magnetic steel, there is no practical proof. The magnetic steel with the surface coated protective...

AI Technical Summary

Problems solved by technology

For the method of coating the protective layer on the surface of the magnetic steel, there is no practical proof. The magnetic steel with the surface coated protective layer can be used for 10 years or even more than 15 years, which meets the needs of military equipment; for the segmented magnetic steel, it is difficult to avoid bumps , damage to the protective layer will further cause the risk of failure of the protective layer; if the curing agent is used for bonding, the surface is difficult to clean, and if it is cleaned forcibly, it will cause damage to the protective layer

The method of sealing the magnetic steel with mechanical parts is generally to use a thin-walled barrel-shaped rotor protective cover made of copper or stainless steel to cover the outer cylindrical surface of the rotor. This method generally cannot seal the end face of the magnetic steel, and the density of the two materials is high, which will make The weight of the motor increases a lot, which affects the application of the motor in the aerospace field

[0003] No technical solution similar to this patent was found after searching the prior art

Images