SU788289A1 - Synchronous machine - Google Patents

Description

The invention relates to electrical engineering and can be used in self-excited synchronous machines with brushless excitation. Synchronous machines are known, in Kotopfjx in one magnetic system the generator and the pathogen are combined. On the stator of the generator there are two windings: a multi-phase main winding of the generator and an additional multi-phase winding with three times the number of pa poles in relation to the generator's main winding, which is short-circuited through the element causing phase asymmetry. There are also two windings on the rotor (inductor): generator excitation winding is an additional winding, which is the core winding of the exciter inductively interconnected with the additional winding on the stator and feeding the excitation winding of the 1 J generator through the semiconductor converter. , since the formation of a magnetic field to implement self-excitation of the generator occurs due to placement on its stator and rotor, in addition to the main windings, the stator and rotor Two additional windings. The closest in technical essence and the achieved result to the proposed is a synchronous self-exciting generator, in which the functions of the generator and its exciter are combined in one rotor core and one stator core. On the stator (bark) there are two windings in common deep grooves: a three-phase four-pole generator output winding and an eight-pole exciter winding. In the recessed grooves of the rotor (inductor) are also two windings; the main four-pole generator winding (excitation winding) and the eight-pole three-phase alternating current winding of the exciter (root winding) supplying the excitation winding of the generator 2 via the rectifier by the direct current of the generator inductor for driving the machine.

This goal is achieved by the fact that in a synchronous machine that has measles with a winding and an inductor with an excitation winding and the excitatory core winding. a kind of elongated teeth of the core alternating with short teeth. They can be mounted on wedges x; for uncased koreas, ferromagnetic elements are made in the form of teeth located between the sides of the windings; the length of the teeth is greater than or equal to the height of the winding.

FIG. 1 shows a part of the cross-section of the machine with elongated teeth on the bark; in fig. 2 of the transverse size of the machine with elongated wedges; in fig. 3 part of the active zone of the machine with a baseless stator.

A winding 2 is placed on the bark 1 of the synchronous machine. To create the required harmonic component, measles 1 is made with ferromagnetic elements 3 protruding into the gap. On the inductor 4 there is a synchronous mgoiin excitation winding 5 and an exciter root winding 6 which provides a semiconductor power winding 5 excitation. The role of the ferromagnetic elements 3 for the synchronous mgoiina shown in FIG. 1, elongated teeth projecting into the gap are made, and for a synchronous machine in FIG. 2 - elongated wedges 3, made of ferromagnetic material, holding the winding 2 boxes. For a baseless synchronous machine (Fig. 3), the role of ferromagnetic elements is performed by the prints 3 stamped together with the belt, the height of which is equal to or greater than the height of the winding. The tabs can be inserted from ferromagnetic material.

 The pitch of the harmonic component of the pulsating field of the inductor is determined by the number of ferrous lagging elements protruding into the gap, and placing them around the circumference of the core.

The ferromagnet elements, which protrude into the gap, increase the pulsation value of the harmonic field of the inductor and, consequently, increase the emf induced in the core winding of the exciter, the process of self-excitation of the synchronous machine increases.

The process of self-excited synchronous machine when using the .harmonic component of the pulsating field

inductor occurs as follows.

When the inductor 4 moves relative to the core 1 of the synchronous machine due to the residual magnetic flux of the inductor 4 and the presence of a harmonic component in the air gap of the machine, an emf is induced in the exciter winding C, which after the semiconductor rectifier is applied to the excitation winding 5. Under

rectified voltage

In the excitation winding 5, a direct current flows, which forms a magnetic field that enhances the magnetic flux of the inductor 4, therefore, the emf increases in the core winding 6 of the exciter. The process of self-excitation occurs and, if the semiconductor rectifier is uncontrollable, the process of self-excitation stops at the forcing value of the current in the excitation winding 5. With a controlled rectifier, a specified value of the excitation current is maintained.

Claims (4)

1. Synchronous Msoiina, containing measles and an inductor with the core winding of the exciter and i connected to it through a semiconductor transducer by winding the excitation of a machine, which, in order to simplify the design, between the surfaces of the inductor and the core are installed ferromagnetic elements. 2. The machine as claimed in claim 1, wherein the measles is serrated, the teeth vary in height, with the longer teeth alternating with the shorter ones. 3.Mashchina according to claim 1, characterized in that the winding of the core is fixed with wedges, with the ferromagnetic elements mounted on the part of the wedges that alternate with the wedges without ferromagnetic elements. 4. The machine according to claim 1, characterized in that the measles is made spasmless and the ferromagnetic protrusions made in the form located between the sides of the windings of the teeth, the height of which is greater than or equal to the height of the winding. Information sources, taken into account in the examination 1. USSR author's certificate No. 260725, cl. H 02 K 19/30, 1968. 2. The patent of France No. 1245426, cl. H 02 K, 1960. g 1 l.,., i .., -,., #. / f .-. f f   788289