SU760311A1 - Synchronous electric machine rotor - Google Patents

Description

The invention relates to electrical engineering, in particular to the design of the rotor of a synchronous electric machine with permanent magnets.

The known rotor is a synchronous electric machine, containing a shaft, permanent magnets, and ferromagnetic poles [1].

In this rotor, half of the ferromagnetic poles are made in one piece with the sleeve mounted on the shaft, and the second half of the poles holds permanent magnets.

The disadvantage of this design is the increased consumption of active steel 15 and the lack of reliability of fastening the magnets.

Also known is the rotor of a synchronous electric machine, which contains a shaft, permanent magnets, and ferromagnetic poles fixed by a nonmagnetic material, having protrusions facing the shaft [2].

In this rotor, in the ferromagnetic poles, slots are made in the radial direction with broadening at the ends facing the outer surface of the rotor. The cavity of the rotor, bounded by the inner sides of the poles

and the internal faces of permanent mag *:

2

threads facing the shaft and the radial slots of the poles are filled with non-magnetic material. This material provides for mounting poles and magnets on the rotor shaft. In this design, the mass of the active steel below.

The disadvantage of such a rotor is non-reliability, since the carrying capacity of this design is limited by the tensile strength of the casting non-magnetic material with 'tensile: natruechs' acting from the poles when the rotor rotates.

The purpose of the invention is to increase reliability.

This goal is achieved by that a nonmagnetic sleeve is installed on the shaft with T-shaped protrusions located between the ferromagnetic poles and adjacent to the permanent magnets and lateral faces of the poles, non-magnetic rings attached to the shaft adjoin the rotor, and the cavities between the protrusions of the sleeve, the protrusions of the poles and rings are filled with non-magnetic material. '

Fig, 1 shows the rotor of a synchronous electric machine; in fig. 2 is the same, section A-A in FIG.

760311

The rotor of a synchronous electric machine contains shaft 1, permanent magnets 2, ferromagnetic poles 3. Ferromagnetic poles have projections from the side facing the shaft, on the shaft there is a non-magnetic sleeve 5 having T-shaped projections 6,

The protrusions of the sleeve are located between the poles and are adjacent to the permanent magnets and the side faces of the 7 poles.

By the ends 8 of the rotor adjacent ring 9, made of non-magnetic material and mounted on the shaft. The cavities between the protrusions of the sleeve, the protrusions of the poles and rings are filled with non-magnetic material 10.

Since the cavity filled with non-magnetic material is comprehensively closed and formed by rigid, non-moving relative to each other walls and completely filled with non-magnetic non-magnetic material, despite the uniaxial compressive load acting on the non-magnetic

material from the side of the * pole, nemag -.......

The casting material in the cavity is in bulk stress state. The bulk modulus of elasticity, which characterizes the stiffness and carrying capacity of the material 'under bulk' loading, is greater than the modulus of tensile elasticity. Therefore, the filling material in the mode of volumetric compressive compression has a large bearing capacity and allows for much greater loads than with tensile uniaxial loads.

ί To reduce losses from vortex currents, ferromagnetic poles are made of laminated. Non-magnetic sleeve is laminated;, which greatly simplifies the technology of its manufacture.

The proposed design allows to increase the reliability of the rotor of a synchronous electric machine.

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Claims (1)

Claim A rotor of a synchronous electric machine containing a shaft, permanent magnets and ferromagnetic poles fixed by a non-magnetic material, having projections facing the shaft, characterized in that, in order to increase reliability, a non-magnetic sleeve with T-shaped protrusions located between the ferromagnetic poles is mounted on the shaft sticking to permanent magnets and side faces along * lusop, non-magnetic rings fixed to the shaft are attached to the rotor ends, and the cavities between the protrusions of the Sleeve, the protrusions of the poles and the rings are filled s nonmagnetic material.