SU1624373A1 - Device for measuring magnetic induction - Google Patents

Abstract

The invention relates to a measuring technique and can be used in practical work in measuring the induction of a magnetic field. The aim of the invention is to improve the measurement accuracy. The device contains two conductive rocker arms 1, conductive load-receiving prisms 2. conductive pillows 3, hangers 4 connected to the TOKO-conducting circuit 5. On isolator 6 a calibration unit 7 is installed. Spring 8 is connected by a rope to shaft 9 of bevel gear 10, connected to gear 11, on which Bdny has a pulley 12. A reading arrow 13 on the measuring scale 14 is attached to the cable. On the insulator 16 there are two current-conducting wires 15, the drawing also shows the reference prism 17, the insulating plate 19, the test arrow 20, control scale 21, conductors 18 for supplying direct current. 1 silt

Description

The invention relates to a measurement technique and is intended for use in practical work for measuring the induction of a magnetic field.

The purpose of the invention is to improve accuracy.

The drawing shows the design of the proposed device.

The device consists of two mutually isolated conductive rocker arms 1, at one end of which current-carrying load-receiving prisms 2 are placed, on which point-carrying pads 3 insulated from each other, suspension 4, connected to the current-carrying contour 5 are supported. On the insulator 6, the calibration unit 7 is installed and the end of the moment spring 8 is hinged. The opposite end of the spring when the caprone cable is pushed is gently connected to the shaft 9 of the bevel gear 10.

The gear is connected with another bevel gear 11, on the shaft of which pulley 12 is placed, and a nylon cable is passed through it. On the cable, the reference arrow 13 of the measuring scale 14 is strengthened. Such a transmission mechanism allows the measuring scale to be conveniently located as well as to stretch it (reduce the cost of dividing). The rocker arms are supported by two conductive plugs 15 mounted on insulator 16. Conductive support prisms 17 of rocker arms 1 are placed on the weighing pads. A support plate 20 of the control scale is mounted on the rocker arms 1 above the support prisms 17 on the rocker arms. 21. The current flow pattern is as follows. A constant current through the conductors 18 through the forks 15, the supporting prisms 17, the rocker arms 1, the load-receiving prisms 2, the pillows 3, the suspension 4 enters the circuit 5. The device before

L

w

s |

with

J

Getting started needs to be set by level. Rotating the knob of the measuring mechanism, set the readout arrow 13 to the zero of the measuring scale 14. Rotating the calibration nuts 7 combine the control arrow 20 with the zero of the reference scale 21. After that, the device is connected to a DC source at 12 V, using the variable resistor by a milliammeter you need current, and start measuring. The constant current through the conductive parts of the mechanism of the device enters the lower part of the elongated loop 5, which is in a magnetic field. As a result of the interaction of the element of the circuit 5 with the current of the magnetic field, the circuit 5 is drawn in or ejected depending on the direction of the current and the magnetic induction vector. The balance is broken. Rotate knob 9 (gear shaft) to set the reference arrow 13 so that the reference arrow 20 is aligned with the zero on the control scale 21. The magnetic force is determined from the position of the reference arrow 13 on the measuring scale 14 and the magnetic induction is calculated. When the knob 9 is rotated, the torque spring 8 is tensioned. The elastic force of the deformed spring 8 is proportional to the force of the interaction of the contour element 5 with the magnetic field of the permanent magnet, therefore the measuring scale is graduated by Newtons (division value 15-10). By changing the current in the circuit and the position of the poles, they are measured again and the magnetic induction is determined. The current varies from 0.1-0.5 A. At such currents, electrocorrosion of the prisms of the rocker arms is practically not observed and

circuit 5 is heated.

Compared with the prototype, the proposed device allows to significantly improve the accuracy of measuring magnetic induction. Relative maximum error

ranges from 0.1 to 0.01%.

Claims (1)

The invention The device for measuring magnetic induction, containing rocker arms, at one end of which a conductive loop with a winding is placed, a recorder, characterized in that, in order to improve accuracy, the rocker arm is made in the form of two isolated current conductors, on one the end of which contains conductive prisms, with insulated conductive pads arranged on them, and hangers connected to the conductive loop at the other end of the beam through the insulating inserts a tare assembly is mounted and one end of the spring is fixed, the other end of which is fastened through a cable to the shaft of the bevel gear that is connected to the other bevel gear, a pulley is placed on the shaft of the latter through which the measuring scale of the recorder passes the rocker arms in the place of support are mounted on conductive supporting prism. //