SU1642556A1 - Electric machine with controlled excitation - Google Patents

Abstract

The invention relates to electric machines, in particular to electric motors, in which the rotational speed control is achieved by varying the excitation flow. The purpose of the invention is to reduce the proportion | Noah mass and dimensions. An electric machine with adjustable excitation contains a bark 2 with a magnetic core 3 and a crust winding 4 and a magnetoelectric inductor 1, having the possibility of relative axial movement, in which the inductor extends out of the core bore using an axial displacement drive. Anchor 2 is equipped with an annular magnetic shunt 5, rigidly connected with the magnetic core 3 in the axial direction and encompassing the extendable part of the inductor 1 during its axial movement. Ring magnetic shunt 5 can be made of laminated, metal-ceramic, etc. To reduce the axial displacements, the magnetic core 3 and the inductor 1 are made of separate parts that are equally spaced from each other along the axis, and the magnetic shunt 5 is made in the form of coaxial rings installed between the magnetic cores 3, except one Magnet line 3 in the direction of extension of the inductor 1. 1 Cp. F., ly, 3 Il. 2 No. SP SP

Description

The invention relates to electric machines, in particular, electric motors, in which rotational speed control is achieved by varying the excitation flow.

The purpose of the invention is. reduction of specific gravity and dimensions,

FIG. 1 shows an electric machine with an internal inductor; beginning FIG. 2- the same, with an external indicus; neither

FIG. 3 shows the construction of a machine made of separate parts arranged along the axis.

An electric machine with adjustable excitation contains a magnetoelectric inductor 1 and a bark 2 with a magnetic core 3, in the slots of which the root winding 4 is placed, and an annular magnetic shunt 5 made of a soft material magnet mounted on the end of the magnetic conductor. Anchor 2 and inductor 1 are mounted with respect to axial movement by means of a drive (not shown).

The inductor 1 and the magnetic core 3 can be made of separate parts of equal length, spaced from each other at the same distance. Parts of the magnetic shunt 5 are made in the form of coaxial rings installed between the magnetic cores 3, except for one installed from the side of the outer magnetic core in the direction of the inductor extension. Separate parts of inductor 1 are rigidly interconnected and have the ability to move along shaft 6. Preferably, inductor 1 is made of permanent magnets.

To reduce losses in the ring magnetic shunt 5 from eddy currents, it being rigidly connected with the magnetic core 3 in the axial direction, can either rotate relative to the magnetic conductor 3 together with the inductor 1 (i.e. be stationary relative to the latter) or during rotation relative to the inductor 1 shunt 5 can be made of laminated, metal-ceramic, etc.

Electric machine works as follows. If it is necessary to control the rotational frequency in the motor mode or the output voltage in the generator, by reducing the excitation flow, the inductor 1 drives the core 2 out of the bore. At the same time, part of it goes out of the magnetic circuit 3 and enters the ring magnetic shunt 5. the inductor flux is shunted and the flux coupled to the winding 4 decreases.

The supply of the machine core 2 with an annular magnetic shunt 5, rigidly connected with the magnetic core 3 in the axial direction, makes it possible to eliminate the occurrence of axial pulling forces. The absence of axial thrust when moving the inductor 1 allows you to lower

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drive power and increase its speed, so as compared with the prototype, the specific mass and dimensions of the electric machine are reduced and its reliability is increased. Moreover, since the inductor extends 1 part of the flow closes through shunt 5 - (using permanent magnets with a texture such as UNDK35T5 or UNDK24 can be assembled with a guard ring, which allows a 15–20% increase in magnet energy compared to assembling in air.

The implementation of the inductor 1, the magnetic core 3 and the ring magnetic shunt 5 of the individual parts allows for the same machine length to reduce the amount of axial displacements to regulate the excitation flow from maximum to zero, which in turn improves the drive speed compared to the prototype.

Claims (2)

1. Electric machine with adjustable excitation, containing measles with magnetic core and crust winding, magnetoelectric inductor, installed with the possibility of mutual axial movement, and axial displacement drive, characterized in that, in order to reduce specific mass and dimensions, measles is provided an annular magnetic shunt rigidly connected with the core magnetic core in the axial direction and installed on the side of the magnetic core end corresponding to the direction of the inductor extension. 2. The machine according to claim 1, characterized in that the magnetic shunt, the stator magnetic circuit and the inductor are made of separate parts, and the parts of the shunt are placed between the parts of the stator magnetic circuit, except for one part installed from the outer end of the extreme part of the magnetic circuit between the parts of the stator magnetic circuit and the inductor axially made equal to each other. . / 2 W% 1 9 and d. 2