RU2634046C1 - Method for creation of navigation magnetic field and device for its implementation - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: field is created by simultaneous current supply of wires and jumpers between them, connected to a current source by current-carrying wire. Along the turn strips, current is additionally passed. It is equal to half the jumper current and directed towards the total current of the jumpers and the current-carrying wire. The current-carrying circuit consists of wires, jumpers between them and a current-carrying wire, zigzag-connected in series in such a way, that currents in adjacent wires are directed counter-way, and in jumpers between them - accordingly. The current-carrying circuit is covered with a current-carrying loop connected to it in parallel or in series so that on the turn strips the conductors of the circuit and the loops coincide, and the circuit currents and loops run counter to each other.

EFFECT: increase in the uniformity of the navigational magnetic field.

2 cl, 2 dwg

Description

The invention relates to agricultural instrumentation and can be used to automate the trajectory control of machine-tractor units (MTA).

Automation of the MTA trajectory control requires programming of the planned trajectories and determination of the actual position of the MTA relative to the planned one. This can be done using a navigational magnetic field created by alternating current of the underground conductive circuit, consisting of driving wires, current jumpers between them and current-carrying wires.

There is a method of creating a navigational magnetic field, according to which only one head wire is supplied with current along which the MTA moves. (Automatic and remote control of industrial tractors. M: TSNIITEtraktoroselzozmash, 1972, Vulakh et al. P. 37, Fig. 18.). The disadvantage of this method is the difficulty of implementation due to the need to switch the driving wires as the MTA moves from one wire to another.

There is a simpler way to create a navigational magnetic field that does not require switching wires (SP Gelfenbeyn. Terranavigatsiya. - M .: Kolos, 1981, - 207 p.). It lies in the fact that at the same time supply current to all or several of the driving wires connected in series with each other through jumpers on the headlands. This method, in which at the same time power is supplied to several head wires and jumpers between them, connected in series by a zigzag, is selected as a prototype.

The disadvantage of the prototype is the distortion of the navigation magnetic field of the driving wires by the magnetic fields of the currents flowing on the headlands in the current jumpers and in the lead wire. These currents create magnetic fields of interference, which are summed with the fields of the driving wires and violate their uniformity, as a result of which the programs of the planned trajectories are distorted, the cohesion of adjacent MTA passes and the quality of the automatic trajectory control of the MTA are deteriorated.

The aim of the invention is to improve the quality of the navigation magnetic field created by the current of the driving wires by reducing the influence of the magnetic fields of the noise created on the headlands by the currents of the jumpers and the lead wire.

According to the invention, in order to achieve this goal, a compensating magnetic field is created on the headlands directed opposite to the magnetic field of interference, for which a compensating current equal to half the current of the jumpers and directed counter to the total current of the jumpers and current-carrying wire is passed along the headlands.

The invention is illustrated in FIG. 1, which shows an electrical diagram of a magnetic field source that implements the proposed method.

 In FIG. 1 is indicated:

1 - AC source;

2 ... 13 - conductive circuit, creating a navigational magnetic field and consisting of driving wires 2 ... 7, jumpers 8 ... 12 and current-carrying wire 13;

14 - current loop with compensating current. Arrows conditionally show the direction of currents.

Figure 2 shows a variant of the device, in which the current loop performs the function of a lead wire.

In the drawings, the arrows conventionally show the direction of the currents. In the description, the current flowing from left to right is called positive, and flowing from right to left is called negative. Positive and negative currents create counter magnetic fields that mutually cancel each other out.

On the terrain, the gon wires are connected by a zigzag, therefore, on the headlands, the currents in the jumpers flow unidirectionally, without coming back and not overlapping each other.

On the turntables, the wire of the loop 14 is combined with the wires of the jumpers 8 ... 12 and the current-carrying wire 13; loop current 14 is selected equal to half the current of circuit 2 ... 13.

The currents flowing in the jumpers 8 ... 12 and in the wire 13 create magnetic fields of interference, which are summed with the fields of the currents flowing in the driving wires 2 ... 7, and thereby distort the planned trajectories of the MTA as they approach the headlands.

The current flowing in the current loop 14 is equal in magnitude to half the current of the conductive circuit and flows countercurrently with jumper current (the upper rotary strip in the diagram) or with the current of the supply wire 13 (lower rotary strip).

On the headlands, all wires are laid together, therefore, the strength of the total magnetic field created by all currents, for example, the lower one according to the headland scheme, is proportional to the total current of the jumpers (9, 11), the lead wire 13 and the lower side of the loop 14. The total current is determined by the algebraic addition - unidirectional currents are added up, and multidirectional currents are subtracted.

In the interval between the gon wires 3 and 4, 5 and 6, the tension created by the currents of the jumpers 9, 11 and loops 2 are summed up, and the lead wire 13 is subtracted. Here, the total current value that creates the magnetic field of interference is equal to half the current of the jumpers and flows from left to right.

In the intervals between wires 2 and 3, 4 and 5, 6 and 7, where there are no jumpers, the tension is created by the difference between the loop currents and wire 13, so the total current value is equal to half the current of the jumpers, but the current flows from right to left.

Counter currents to the left and right, for example, from wire 5 create above this wire equal in magnitude but opposite in direction magnetic fields that mutually cancel each other. Therefore, the magnetic field over the wire 5 does not depend on the currents on the headland, but is determined only by the current of this wire.

A similar situation occurs on the upper headland according to the scheme, where the current-carrying wire is absent, and the interference field over the wires is compensated by the total current of jumpers 8, 10, 12 and the loop flowing from left to right, and the loop current 2 is the same in magnitude, flowing from right to left in places where there are no jumpers.

The loop can be connected not in parallel, but in series with the driving wires, performing the function of a current-carrying wire 13, as shown in FIG. 2. In this case, the loop current flows towards the jumper current on both headlands - upper and lower, decreasing the effective current of the jumpers at their location and creating a counter current in the absence of jumpers.

Claims (2)

1. A method of creating a navigational magnetic field for automating the control of machine-tractor units by simultaneously supplying current to the daisy chain wires connected in series and jumpers between them connected to a current source by a lead wire, characterized in that to improve the quality of the navigating magnetic field generated by the driving currents, along the headlands pass compensating current equal to half the current of the jumpers, and directed counter to the total current of the jumpers and current lead odyaschego wires. 2. A device for creating a navigational magnetic field for automating the control of tractor units, made in the form of a conductive circuit consisting of gon wires, jumpers between them and a lead wire connected in series with a zigzag in such a way that the currents in adjacent gon wires are opposed, and in the jumpers between them - unidirectional, characterized in that it contains a conductive loop that covers the conductive circuit and is connected to it in parallel or sequentially It is only in such a way that on the headlands the conductors of the circuit and the loops coincide, and the currents of the circuit and the loops flow in opposite directions.

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