RU111724U1 - WINDING AC ELECTRIC MACHINE - Google Patents

Abstract

The invention relates to the field of electrical engineering and can be used in any industry and transport.

The winding of an AC electric machine includes many flat, profiled out of a groove, insulated from each other hard elementary segmented conductors, laid in grooves with the wide side parallel to the bottom of the groove, and connected after laying in one or both frontal parts of the electrical circuit of the winding.

The technical result of the utility model is:

- the ability to fully automate the process of manufacturing and laying windings, including multi-layer;

- reduction of the effect of eddy currents and the effect of current displacement, especially at higher frequencies;

Description

The invention relates to the field of electrical engineering and can be used in any industry and transport.

AC electric machines are well-known with loose, semi-rigid, and rigid windings, sections of which are wound from insulated wires of round or rectangular cross-section (“Designing Electric Machines” Edited by IP Kopylov, Moscow, Energy, 1980, p. 42), in the frontal parts connected in an electrical circuit, for example, a star or a triangle. Rigid windings of machines can be performed by rods, a separate element of which is a rod, which is one groove part and two halves of the frontal. Semi-rigid and rigid coils are made of a rectangular winding wire. Of the hard coils, the windings of the phase rotors of asynchronous motors are also performed.

Promising asynchronous machines are also known in which the higher harmonics are effectively suppressed (RU 2046515 C, H02K 17/06, 10/20/1995; USA 5,559,385, H02K 3/28, 09/24/1996; RU 2011120305/07, H02K 17, 2011). Despite the more complex design of the windings, these machines have a number of advantages and are distinguished, first of all, by their higher specific power and increased energy characteristics. So, with the overload of such an electric motor, the shaft speed decreases, but the current practically does not increase. The same thing happens with a sudden drop in voltage in the circuit. The engine continues to work economically at lower speeds without overheating, and after restoring the supply voltage to the nominal level, it automatically enters the calculated operating mode. In case of underloading, the power factor of the electric motor drops smoothly, remaining in the region of high values, due to which it works very economically (http://dvigatel.myfor.ru).

One of the most vulnerable places of winding insulation is the parts of the coil exit from the groove at the ends of the machine, where the electric field increases and the insulation of the coils is weakened due to the bending of their frontal parts. To ensure the necessary electrical strength, the bending area of the frontal parts is removed at a certain distance from the end of the magnetic circuit. This distance depends on the type of windings and the rated voltage of the machine and is taken into account when calculating the length of the frontal part and the average length of the coil. To enhance the electrical strength of this section in loose and semi-rigid windings, additional layers of insulation are applied at the places where the coils exit the grooves.

The rigid system of the frontal parts withstands large shock loads and allows air to pass between the frontal parts of adjacent coils, which improves the cooling conditions of the electric machine.

The disadvantage of these machines is the difficulty of automating the processes of laying multilayer windings, installing frontal insulation and strapping the frontal parts.

The disadvantage of bulk windings is the low fill factor of the grooves with copper due to the presence of air gaps between the round elementary conductors.

When operating at higher frequencies (200-400 Hertz), there is a sharp increase in losses due to eddy currents in the conductors, which entails the need to crush effective conductors into a larger number of elementary conductors, and as a result leads to a decrease in the fill factor of the grooves with copper.

The technical result of the utility model is:

- the ability to fully automate the process of manufacturing and laying windings, including multi-layer;

- reduction of the effect of eddy currents and the effect of current displacement, especially at higher frequencies;

This technical result is achieved by the fact that the winding of an AC electric machine includes thin flat, profiled outside the groove, rigid elementary segmented conductors laid in the grooves of the magnetic circuit isolated from each other and from the groove, with the wide side parallel to the bottom of the groove, forming a multilayer structure in the form filling each groove in a stack of elementary conductors connected to a winding circuit on one or both of the frontal parts.

There is an option for winding a machine in which elementary segmented conductors are stamped.

There is also a variant of the winding of the machine, in which elementary segmented conductors are combined into a multilayer rod before laying in a groove.

A machine winding option is also possible, in which the frontal parts of elementary segmented conductors are connected by welding on the frontal part to a winding circuit.

The above technical result is achieved by implementing a utility model by manufacturing, according to the description, the stator winding of an asynchronous alternating current machine with rectangular grooves of the magnetic circuit, which works in the same way as well-known asynchronous machines.

Claims (4)

1. The winding of an AC electric machine, including many flat, profiled outside the groove, rigid elementary segmented conductors laid in grooves isolated from each other and from the groove with the wide side parallel to the bottom of the groove and connected in one or both frontal parts to the electrical circuit of the winding . 2. The winding according to claim 1, characterized in that the elementary segmented conductors are stamped. 3. The winding according to claim 1, characterized in that the elementary segmented conductors before laying in a groove are combined in a rod. 4. The winding according to claim 1 or 3, characterized in that the frontal parts of the elementary segmented conductors are connected to the winding circuit by welding.