SU1661932A1 - Electric machine converter - Google Patents

Abstract

The invention relates to electrical engineering, namely, to electric machine converters. The aim of the invention is to increase reliability. The device is an end type electric machine converter containing cores of the stators of an asynchronous motor and synchronous generator and the cores of their rotors placed on the same shaft. A three-phase winding connected through a rectifier to an excitation winding located in the slots of the generator rotor core and a strength end current-conducting disk, reducing starting currents and providing protection to the rectifier, is located in the slots of the rotor core of the engine. The inverter can be used in autonomous power systems. 3 il.

Description

The invention relates to electrical engineering, in particular to electric machine converters, and can be used in autonomous systems.

The aim of the invention is to increase reliability by reducing inrush currents and increasing structural strength.

Figure 1 shows the electric machine converter, a longitudinal section; figure 2 - scan of the magnetic circuit; on fig.Z - the electrical circuit of the converter is basic.

The converter contains a stator core 1 of an induction motor with a winding 2, a core 3 of a phase winding 4 of an induction motor, and a core 5 carrying the excitation winding 6 of a synchronous generator. Both cores are fixed in a supporting ring 7, which is made of a non-magnetic material. The generator stator core 8 contains a winding 9. A three-phase motor winding 4 is connected via an uncontrolled rectifier 10 to an excitation winding 6 located in the slots of the core 5 of the synchronous generator rotor. The end face disk 11 is made of a conductive conductive material (for example, duralumin) and fastened axially with a damper winding 12 of the generator rotor, made in the form of a disk, with brackets 13 recessed into the ring 7. The bearing ring is pressed into the stress case 14.

Electromachine works as follows.

The winding 2 of the asynchronous motor stator is supplied with AC power

YU

WITH

Yu

current Due to the fact that the inductive resistance of the three-phase winding 4 of the asynchronous motor is large, the starting current under the action of the rotating excitation field flows in the disk 11, which is the starting winding. The rotor of the converter spins up to a speed close to synchronous and different from it by the slip value S. As the current accelerates, the frequency f of the winding 4 decreases, and the inductive resistance of this winding also decreases. Under the action of the emf slip in the winding 4, a current flows, which through the uncontrolled rectifier 10 feeds the winding 6 of the generator rotor. The flow Fg (Fig. 2) created by the winding 6 induces an emf in the winding 9 of the generator stator, the energy of which is transferred to the load.

The converter is highly reliable in operation, as its engine develops a large starting torque.

due to the large active resistance of the disk, it also protects the rectifier valves from inrush currents and keeps the three-phase winding of the motor rotor from

Claims (1)

movement in the axial direction. DETAILED DESCRIPTION OF THE INVENTION Electromachine frequency converter comprising cores of the synchronous and asynchronous stators a motor and a common rotor with the stators of the phase winding of the motor respectively located and connected to it via the rectifier of the generator excitation winding, characterized in that In order to increase reliability, the rotor is made in the form of a disk, on the end sides of which the said windings are located, and on the rotor surface of the induction motor there is a fixing phase winding is a continuous disk made of conductive material, limiting inrush currents in this winding. -Y eight FIG. / 12 figure 2 9 K load . FIG. J