SU797004A1 - Synchronous machine - Google Patents

Description

(54) SYNCHRONOUS MACHINE

one

The invention relates to electrical engineering and can be used in self-excited synchronous machines with brushless excitation.

Synchronous machines are known in which a generator and a pathogen are combined in one magnetic system. The generator has a multi-phase generator main winding on the stator (crust) and an additional multi-phase winding with a tripled number of pole pairs with respect to the generator core winding, which is short-circuited through the element causing phase asymmetry. The rotor (inductor) also contains the generator excitation winding and an additional winding, which is the main winding of the exciter, inductively interconnected with the additional winding on the stator and feeding the generator excitation winding l through a semiconductor converter.

The disadvantage of this device is its complexity, since the formation of a magnetic field for self-excitation of the generator occurs due to the placement of two additional windings on its stator and rotor, in addition to the main windings, stator and rotor.

The closest in technical essence and the achieved result to the proposed is a synchronous machine, in a synchronous self-excited generator of which the functions of the generator and its exciter are combined

0 one rotor core and one stator core. On the stator (bark) there are two windings in common deep grooves, fixed with wedges: three-phase four-pole output

5 generator winding and eight pole excitation winding. The main four-pole generator winding (excitation winding 1 and eight-pole three-phase alternating current winding of the exciter (root winding)) supplying the alternator excitation winding 2 through DC rectifier are also located in the deepened rotor (inductor) slots.

five

A disadvantage of the known is the complexity of the design of the excitation system.

The purpose of the invention is to simplify the design of the machine, reducing the number of windings.

The goal is achieved by the fact that in a synchronous machine that has measles with a winding, wedges fixed in grooves, an inductor with an exciter winding and the main winding of the exciter that feeds the machine's windings through a semiconductor rectifier, is made of ferromagnetic and insulating materials wedges of ferromagnetic material alternate with wedges of insulating material,

FIG. 1 shows a part of a synchronous machine; a cross-section} in FIG. 2 shows the connection circuit of the exciter core winding, providing the self-excitation mode of the synchronous machine.

On the bark 1 of a synchronous machine, a winding 2 is placed, secured in grooves by wedges 3 made of ferromagnetic and insulating materials, with the wedge alternating along the slots in the tangential direction in a certain sequence. On inductor 4 is placed winding 5 of the synchronous machine and the core winding of the exciter. The anchor winding of the driver via a semiconductor rectifier 7 provides power to the excitation winding 5. The harmonic component pitch of the pulsating field of the inductor is determined by the alternation in the tangential direction along the grooves of wedges of ferromagnetic and insulating materials and will be equal to the distance between the insulating wedges.

The process of self-excitation of the synchronous machine when using the harmonic component of the pulsator of the inductor floor is as follows.

When the inductor 4 moves relative to the core 1 of a synchronous machine due to the residual magnetic flux

inductor 4 and the presence of a harmonic component in the air gap of the machine in the core winding of the driver, an emf is induced, which, after the semiconductor rectifier 7, is applied to the excitation winding 5. Under the action of the rectified voltage in the excitation winding 5, direct current flows, which forms a magnetic field, which amplifies the magnetic flux of the inductor 4 and, therefore, increases the emf in the core winding of the exciter. The process of self-excitation takes place and if the semiconductor rectifier 7 is uncontrollable, the process of self-excitation will stop at the forced current value in the excitation winding 5. With the controlled rectifier 7, the set value of the excitation current is maintained.

Claims (2)

Invention Formula A synchronous machine containing measles with a winding fixed in pa. capture wedges, an inductor with an excitatory core winding and an excitation winding connected to it through a semiconductor converter, characterized in that in order to simplify the design, one part of the wedges is made of ferromagnetic material, and the other of the insulating, and the wedge of ferromagnetic material alternate in lasers with wedges of insulating material. Sources of information taken into account in the examination of 0 1. USSR author's certificate 260725, cl. H 02 K, 1968. 2. The patent of France 1245426, cl. H 02 K, 1960.