RU2284644C1 - Autonomous electric power system - Google Patents

Abstract

FIELD: electric engineering, possible use for providing electric power to objects.

SUBSTANCE: autonomous electric power system additionally contains three-phased rectifier with smoothing filter, automatic release and block for automatic power adjustment. First, second and third outputs of synchronous generator with excitation device are connected respectively to first, second and third inputs of three-phased rectifier with smoothing filter. Output of rectifier is connected through automatic power adjustment block to first input of automatic release. Second input of release is connected to rheostat output. Output of release is connected to input of direct current electric motor.

EFFECT: provision of rotation of electric motor shaft without constant connection to battery.

1 dwg

Description

The invention relates to the field of electrical engineering and can be used to power objects.

The known system of autonomous power supply presented in the book by E.S. Traube, V.M. Mirgorodsky, M., Higher School, 1985, p. 96.

In it, with the help of a primary motor, which can be a direct current electric motor, powered by a storage battery, the shaft of the synchronous generator with the exciter is rotated. The shaft of the generator is rigidly connected with the shaft of the electric motor. The current output from the battery is regulated by a rheostat, and the three-phase voltage from the synchronous generator is supplied to the nodes of consumption. However, the system requires a constant battery connection.

The well-known system of autonomous power supply, described in the book of V.E.Kitaev. Electrical engineering with the basics of industrial electronics. M., Higher School, 1985, pp. 138-140. It uses the same nodes as in the aforementioned first analogue. However, the rotation of the motor shaft without a constant connection of the battery is also not ensured.

Using the proposed system provides the rotation of the motor shaft without a permanent battery connection. This is achieved by introducing a three-phase rectifier with a smoothing filter, an automatic release and an automatic power control unit, while the first, second and third outputs of the synchronous generator with a pathogen are connected respectively to the first, second and third inputs of a three-phase rectifier with a smoothing filter, the output of which is connected through an automatic block power adjustment with the first input of the automatic release, the second input of which is connected to the output of the rheostat, and the output with the input of the motor toyannogo current.

In figure 1 and in the text the following notation:

1 - rechargeable battery; 2 - rheostat; 3 - automatic release; 4 - a direct current electric motor; 5 - synchronous generator with a pathogen; 6 - block automatic power adjustment; 7 - three-phase rectifier with a smoothing filter; 8 - consumed nodes,

the first, second and third outputs of the synchronous generator with the exciter 5 are connected respectively to the first, second and third inputs of the consumed nodes 8 and a three-phase rectifier with a smoothing filter 7, the output of which is connected through the automatic power control unit 6 with the first input of the automatic release 3, having the second input and output, respectively connected through a rheostat 2 to the output of the battery 1 and to the input of a DC motor 4, rigidly connected to a synchronous generator with excite 5 eat.

The system operates as follows.

Using the battery 1, direct current is supplied through the rheostat 2, through an automatic release 3 to the DC motor 4, the shaft of which is rigidly connected to the shaft of the synchronous generator with the exciter 5. The latter generates a three-phase alternating voltage to the consumed nodes 8 and to the three-phase rectifier with a smoothing filter 7. The current value from the output of the battery 1 is controlled using rheostat 2.

An example of a synchronous generator with an exciter 5, where the excitation windings are excited by a direct current generator, is presented in the aforementioned Main analogue on page 139, Fig. 94, and an example of a three-phase rectifier with a smoothing filter that converts AC voltage to DC is presented in the aforementioned first analog on page 107, where the necessary voltage for rectification is set on the secondary winding of the transformer. It was noted that such a rectifier provides power to the DC motor. Connecting the rectifier 7 to the three-phase output of the generator 5 will not degrade the power quality of the consumed nodes 8. In addition, it is noted in BCKitaev’s book “Electrical Engineering with Fundamentals of Industrial Electronics” on page 171 that the frequency of rotation of the motor shaft increases with increasing voltage supplied to its input . From the output of a three-phase rectifier with a smoothing filter 7, the rectified voltage is supplied through the automatic power control unit 6 to the first input of the automatic release 3, with which it is automatically connected to its first or second inputs depending on the magnitude of the voltages supplied to these inputs. In particular, after fixing a certain voltage value from the battery corresponding to the steady-state mode of operation of the DC motor 4, in the automatic release 3, its second input is connected to the output of the automatic power control unit 6. An example of a specific embodiment of the automatic release is presented, for example, in the aforementioned source indicated in the first analogue in the book by E.S. Traube and V.G. Mirgorodsky on pp. 142-143. After the aforementioned connection of the automatic power control unit 6, when the voltage is lower than the reference voltage, the voltage supplied through the automatic release 3 to the DC motor 5 is stabilized in the unit 6. However, when the voltage becomes lower than the regulated one, the automatic release 3 connects the battery 1 to the electric motor 4. Next, the above steps are repeated again.

An example of a specific implementation of the automatic power control unit is presented, for example, in the book by M. Kaufman, A. Sidman "Practical Guide to Calculating Circuits in Electronics". Handbook No. 1, M., Energoatomizdat, 1991, p. 219. Thus, due to the introduction of nodes that provide feedback between the synchronous generator with the exciter 5 and the DC motor 4, the shaft of the motor 4 is rotated for a certain period of time without connecting the battery 1. This is explained by the inertia of the rotation of the motor shaft, which makes it possible using the unit automatic power control 6 to keep for a certain period of time the constant rotation of this shaft.

The system can be applied in the absence of mains power sources, where there are no other engines, for example, internal combustion, etc. This ensures an economical mode of operation of the power source.

Claims (1)

An autonomous power supply system consisting of a battery, a rheostat, a direct current electric motor, a synchronous generator with an exciter and consumed nodes, where a synchronous generator with an exciter is rigidly connected to a direct current electric motor and has first, second and third outputs connected respectively to the first, second and the third inputs of the consumed nodes, and the output of the battery is connected to the input of the rheostat, characterized in that a three-phase rectifier with a smoothing filter is introduced, automatic an electronic release and an automatic power control unit, while the first, second and third outputs of the synchronous generator with an exciter are connected, respectively, to the first, second and third inputs of a three-phase rectifier with a smoothing filter, the output of which is connected through the automatic power control unit to the first input of an automatic trip, whose input is connected to the output of the rheostat, and the output to the input of a DC motor.