Rotor unit for electromotor and internal rotor electromotor

Abstract

The invention relates to a rotor unit for an electromotor, comprising a rotor shaft and at least one permanent magnet arranged thereon. Said rotor shaft comprising a permanent magnet is housed in a bushing and is freely rotatable therein. The bushing is closed on a first end thereof by a flange. The invention also relates to an internal rotor electromotor comprising a stator and a rotor unit in the above-mentioned form, the stator being pushed onto the bushing in the rotor unit.

Description

technical field [0001] The invention relates to a rotor assembly for an electric motor and an inner rotor electric motor using such a rotor assembly, said rotor assembly comprising a rotor shaft and at least one permanent magnet arranged on the rotor shaft. Background technique [0002] The present invention relates to the field of brushless electric motors with permanent magnets, and more particularly to direct current electric motors configured as so-called inner rotor motors. An inner rotor electric motor includes a rotor assembly including a rotor shaft and one or more permanent magnets disposed on the rotor shaft, the rotor shaft being inserted into a stator assembly including a stator body and field coils. [0003] The construction of such a motor is described in US Patent No. 5,970,600. The electric motor includes a housing housing a stator, a rotor assembly, and bearings rotatably supporting the rotor assembly. The stator includes stator plates and coils, and defin...

AI Technical Summary

Problems solved by technology

[0004] The problem that arises during the manufacture of such internal rotor motors is that when the rotor assembly is inserted into the inner space of the stator, ferromagnetic particles are carried away from the rotor magnets, which particles can reach the outer contour and stator which are substantially formed by the rotor magnets. The working clearance defined by the inner contour of the

[0009] The inner rotor motor of DE3237196 also has the disadvantage that, due to the sealing of the rotor assembly, direct mechanical coupling of the load is not possible, the torque transmitted from the rotor to the shaft can only be generated indirectly from the rotor to the shaft, e.g. by means of a magnetic coupling, as in described in the patent literature

However, additional parts are required, especially the sleeves thus "lost"

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