SU775823A1 - Electric salient-pole machine rotor - Google Patents

Description

The invention relates to an electrically driven machine and can be used in electric machines with a pole-mounted rotor.

Known synchronous electric machine with a pole-pole rotor, in which the coil. The excitation windings are fastened with T-shaped parts made of non-magnetic material, located one after the other along the entire pole length C in the interpolar space and fixed in the rim with - using the hammer-like shank 1.

But the use of T-shaped parts for fastening the excitation coils makes it difficult for air to escape from the rim of the rotor into the interpolar space and, thus, impairs the cooling of the excitation winding.

Also known is a rotor of a right-hand electric machine, containing poles with excitation coils and pole pieces, in the longitudinal grooves of the aurora are fixed with their end faces.

parts transverse beams placed between adjacent poles 2.

In this rotor, the excitation coils are fastened with the edges of the pole pieces, therefore the protruding portions of the pole pieces are more than half the width of each side of the coil. This is done so that the center of gravity of each side of the coil is located under the edge of the tip and not

10, the turns of the excitation coils turned out under the action of their own centrifugal forces during the operation of the machine.

15

Pole tips of this size drive the flow of the poles to increase, which in turn entails an increase in the excitation power and the deterioration of the electromagnetic

20 characteristics of the machine. As the excitation power increases, losses in the rotor winding increase and operating temperatures increase.

In addition, in this rotor, the transverse beams have a greater freedom of transverse movements in the longitudinal grooves of the pole pieces, since it has special mounting gaps, and there are inevitable distortions of the poles one relative to the other.

The aim of the invention is to reduce (ce excitation power. The indicated

The goal is achieved by the fact that in the rotor of the blunt electric machine there are poperfichny beams on the inner side of the notches in which strips of non-magnetic material are placed, which are supported by the excitation coils, and in the end parts of the beams are also notches in which the protruding portion of the pole piece in contact with the strip has a width less than half the width of the transverse side of the excitation coil. Decomposing elements may be made of non-magnetic material.

FIG. 1 shows a rotor of a pole-type electric machine; a cross-section in FIG. 2 "- section A-A in FIG. one.

The rotor contains a rim 1 on which poles 2 with pole pieces 3 and excitation coils 4 are fixed. The protruding parts of the 5 pole pieces 3 are made not less than half the width of one side of the excitation coil shortened to each other. In the pole pieces 3, longitudinal grooves 6 are made into which they are inserted (Transverse beams 7. Beams 7 have fixing notches 8 on the inside and cutouts 9 at the ends, 8 beams 7 are located in the notches 8 and supporting strips 4 rest on the excitation coils, since they are equal in height to the projecting parts of the 5 pole tips 3, and along the ends in the notches 9 there are proppant elements (counter wedges) 11, which fix the beams 7 in the longitudinal grooves 6.

For ease of installation, the transverse beams 7 are assembled into cells using studs 12. The bars 1C and the counter wedges 11 are made of a nonmagnetic material.

When the rotor rotates during the operation of the machine, centrifugal forces arise, which tend to twist the turns of the excitation coils 4, since the center of gravity of each side of the coil is located

the support is the blunt part of the 5-pole tip 3. These forces are transmitted through the strips 10 to the transverse beams 7, which are inserted into the longitudinal grooves of the 6-pole nozzles 3 and fixed in these grooves by opposing wedges 11. Thus, the transverse beams 7 serve as a support for excitation coils 4 and prevent movement of these coils during operation of the machine.

Making the ends of the pole tips short and strips of non-magnetic material reduces the excitation power by reducing the scattering fluxes, which leads to a decrease in rotor temperatures.

Making cuts on transverse beams and placing strips supported by the excitation coils in them makes it possible to avoid turning the turns of the excitation coils under the action of their own centrifugal forces, which result from the fact that the center of gravity of each side of the coil is on the edge of a pole piece.

The wedging of the transverse beams after installation in the grooves of the pole pieces by opposing wedges allows us to eliminate all the mounting gaps, as well as the inevitable gaps that arise as a result of the poles skewing relative to each other. Consequently, the possibility of vibration and loosening the attachment of the excitation coils is eliminated.

Thus, the described device makes it possible to reduce the excitation power and ensures reliable fastening of the excitation coils.

Claims (2)

1. A rotor of a pole-mounted electric machine, containing poles with excitation coils and pole pieces, in the longitudinal grooves of which transverse beams fixed between adjacent poles are fixed with their ends in order to reduce the excitation power, the transverse beams on The inner side has cuts in which the strips made of non-magnetic material are placed resting on the excitation coils, and in the front parts of the beams cuts are also made in which the wedging elements are placed, why is the speaker -lacTb The pole piece in contact with the strip has a width less than half the width of the transverse side of the excitation coil. 2. The rotor according to claim 1, about tl and h a yuschi and with the fact that wedging elements are made of non-magnetic material. Sources of information taken into account in the examination 1. The patent of Switzerland No. 496350, cl, H 02 K 1/24, 1970. 2. The author's certificate of the USSR N 347858, cl. H 02 K 3/20, 1967. nineteen P X: 77 at E5 FIG. 1