SU43385A1 - Electric ac machine - Google Patents

Description

The present invention relates to the design of AC electric machines, in particular high-frequency machines, and consists in some features of their constructive implementation, aimed at reducing losses and thereby increasing the efficiency.

According to the invention, in the proposed machine, the core winding is placed in a special frame of insulating mechanically strong material located in the interstitial space (between the rotor and the stator iron or two parts of the rotor). The latter entails a corresponding increase in the interstitial space and, as a result, the machine requires a strong excitation. The proposed design is therefore justified in such types of machines, in which the losses in iron are large compared to the losses on excitation, such as, for example, in high-frequency machines.

In FIG. 1, 2 and 3 depict exemplary forms of the winding of the core of the proposed machine, moreover, A and N denote the rotor and the stator of the machine, C - the frame of insulating material, D and E - the windings of the core.

In the case of a high-frequency machine, the core winding can be placed in frame C above, thus

(463)

so that it comes closer to the part of the machine which, during operation, is in motion relative to the specified winding and in all cases is located as close as possible to this part of the machine, depending on the strength of the frame material. Most high-frequency machines are of the so-called inductor type, in which the rotor is usually provided with teeth and valleys, which is caused by the presence of a pulsation in a magnetic field. These pulsations cause high frequency currents in the correspondingly made winding of the core. Therefore, it is clear that the difference in magnetic flux density decreases with a change in the distance between the teeth and the valleys between them, so that it is important for the power of the machine that the core winding is closer to that part of the machine that is provided with teeth and valleys and moves relative to the winding than to others. magnetic machine parts. Further, the space between the iron masses of the stator and the rotor must be made so large that the high-frequency pulsations of the magnetic field are as level as possible when the magnetic field passes through the air gap.

In addition, it is important that the stator boring surface adjacent to frame C does not have teeth in order to

to make high-frequency magnetic flux density changes in iron as small as possible.

FIG. Figures 2 and 3 show how the high-frequency winding, located in frame C, is associated with stator A (the winding is located closer to the rotor B fitted with the teeth). The stator is made without teeth.

In the case of a high frequency machine operating as a single core converter, it is supplied with an additional low frequency E core winding or a DC current winding designed to drive the machine in rotation when interacting with the main magnetic field. This winding should also be placed in a frame of insulating material between the magnetic active parts of the machine or in the same frame C as the high frequency winding D.

Electric machines can be made in accordance with the invention and, as indicated in FIG. 1, i.e., with the crust winding D in its frame C at some distance from the magnetically acting parts A and B, which in this case move relative to the winding of the core, both the main poles and the teeth with hollows between them L and B must be the same.

The winding of the core in high frequency machines is made of thin enameled copper wires for possible reduction of copper losses.

All gaps between the teeth of the rotor should be filled with bronze liners to reduce air friction and fix the excitation winding, etc.

The frames for the winding of the core can be provided with grooves for the conductors and assembled into one unit, after which the windings are inserted into the grooves.

The subject of the patent.

1. The AC electric machine, in particular, a high-frequency machine, replies that the core winding is placed in frame C of insulating material located in the inter-iron space between the rotor and the stator iron or two parts of the rotor and fastened to the stator.

2. The form of the machine according to paragraphs. 1 and 2, characterized in that the core winding is located closer to the surface of the rotor than to the stator iron or to another surface of the rotor.

3. The form of the machine according to paragraphs. 1 and 2, characterized in that the surface of the stator bore adjacent to the frame C does not have teeth.

4. Application in the car on PP. 1-3, when operating as a single core converter placed in frame C, besides a high frequency winding, a low frequency winding E or a DC winding designed to drive the machine in rotation.

to the in-cah patent Torsten Nilsson-Stig

No. 4S385.

OPIG one

OEIG.Z

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