SU1078546A1 - D.c.electric machine - Google Patents

Abstract

DC ELECTRIC MAYANOUS, containing additional positive poles with windings, means for controlling their dissipation flow, main poles and a core winding, which in order to increase reliability by reducing lateral fluxes, on the faces of the additional poles facing to the main poles, a scattering flow control is placed in the form of turns of additional windings connected to the winding circuit of the core. W SH) SP about

Description

The invention relates to electrical engineering, in particular to electric machines of direct current with additional poles.

An electric machine, direct current, consisting of a core, main and additional poles, and an excitation winding Cl.

The disadvantage of this design is the large scattered fluxes, passing mainly through the side surfaces of the additional pole, the presence of which requires an increase in the magnetizing force of the excitation winding of the additional pole. In case of multiple current overloads, the core of the additional α-pole is saturated, and the linear relationship between the current of the core and the switching current is broken. A reactive EMF grows faster than a switching EMF, and the quality of switching, and hence the reliability of the machine, is sharply deteriorating.

Closest to the proposed are electric DC machines, containing additional poles with windings, a means of controlling their dispersion flow, main poles, and a C23 core winding.

A disadvantage of the known construction is the large lateral dispersion flows. The introduction of magnetic and non-magnetic spacers used as a means of regulating the flow of scattering only allows changing the magnetic resistance of the magnetic circuit of the additional pole and, therefore, changing the relationship between the switching flow and the scattering flow. The magnetizing force of the winding of the additional pole must be sufficient to create both flows. Under current overloads, the core of such an additional pole becomes saturated, the reactive EMF grows faster than the switching EMF due to the nonlinearity of the magnetic characteristic of the core when the switching voltage decreases sharply, the reliability of the machine as a whole decreases.

The purpose of the invention is to increase the reliability of a DC electric machine by significantly reducing side scatter streams.

This goal is achieved by the fact that in a DC electric machine containing additional poles with windings, a means for controlling their flow of dispersion, main poles and a winding of the core, on the side faces of the additional poles facing the main poles are placed a means of controlling flow of dispersion in the form of turns of additional windings included in the circuit of the winding of the core.

The drawing shows the proposed device.

The device contains an additional pole 1, massive or laminated, on which the winding 2 is located. On the side faces of the additional pole 1 there are turns 2, which constitute an additional winding 4, Coils 3 of the additional winding 4 are connected to a winding 2 with a winding 2 cars. Between themselves, coils 3 are connected in series,

The electric machine works in the following way.

In stationary mode by winding

2 a current is flowing cor, and in the additional winding 4 a current J. p which is defined as

,,

where ed is the current of the secondary winding;

HL - current K - a constant factor, the value of which can be selected within 0-1 and depends on the connection circuit of the additional winding

3k to the winding 2. The magnitude of K is determined by the necessary degree of compensation of the side scattering currents and the magnitude of the current core.

The current Ldd creates a flow directed opposite to the lateral flow of the scatter, and compensates for it in whole or in part. The required magnetizing force of the winding 2. decreases, and the operating point falls down along the linear part of the magnetization characteristic. The required number of turns of the main field winding 2 is reduced.

In a transient mode, when the side stream is scattered almost according to the law of change of the core current, the current, 7d, also varies proportionally or equally with the core current. Therefore, the side stream is dissipating and compensating for it, the additional winding 3 is changed according to the same law, due to which a reduction in the mismatch of the reactive and switching electromotive force is achieved, firstly, because the side stream is scattered significantly reduced or completely absent secondly, because the operating point remains within the linear portion of the magnetization characteristic of the additional pole. Reducing the misalignment of these EMF improves switching, reduces the level of curvature of the collector and helps to maintain its performance for a long time.

31078546

In transient conditions, the reliability of the main pole of the opposite field of the noctoHHoro current machine increases. Therefore, to compensate for non-reversible non-reversible machines, the constant-to-non-reversible-current machines of the additional current, the lateral flow of the dissipative winding 4 consists of a single additional pole, and the number of turns on the hot-wire of the core of the pole 1 is greater.

metric side streams scatter

Claims (1)

DC electric machine containing additional poles with windings, means for controlling their scattering flux, main poles and armature winding, characterized in that, in order to increase reliability by reducing lateral leakage fluxes, means are placed on the faces of additional poles facing the main poles control the scattering flux in the form of turns of additional windings included in the armature winding circuit.