SU1626232A1 - Device for measuring temperature coefficient of magnetic induction of permanent magnets - Google Patents

Abstract

The invention relates to magnetic measurements and can be used to determine the temperature coefficients of magnetic induction of permanent magnets. The invention is an increase in the accuracy of measuring the temperature coefficient. Peaceful induction of permanent tape recorders. The goal is to achieve hemocothermic 1 from two compartments and 3 g i; eperog 4 of non-magnetic material with a va thermal expansion coefficient; the temperature dtch B is located in the first compartment, and the magnet is disconnected 5 and the Converter Holt 7 - to a friend | With a constant temperature compartment of 1 sludge.

Description

The invention relates to the field of magnetic measurements and can be used to determine the temperature coefficients of the magnetic induction of permanent magnets.

The aim of the invention is to improve the accuracy of measuring the temperature coefficient of the magnetic induction of permanent magnets.

This goal is achieved by the fact that the heat chamber is made of two compartments with a non-magnetic material pegylide with a low coefficient of thermal expansion, the temperature sensor is located in the first compartment, and the open magnetic circuit and the Hall converter are in another compartment with a constant temperature. As a result of this, the temperature coefficient of magnetic permeability of the magnetic core material and the temperature coefficients of sensitivity and residual voltage of the Hall transducer are not affected by the results of measurements of temperature goats> magnetic induction coefficient of constant Mai nits.

The drawing shows a device, General view.

The device comprises a heat chamber 1 made of two compartments 2 and 3 with a partition 4 of non-magnetic material with a low coefficient of thermal expansion, for example, fused silica with a thickness of 3 m. The temperature sensor 5 is located in the first compartment, and the open magnetic circuit 6, for example, in the form of a truncated cone and the Hall transducer 7 in another compartment with a constant temperature (temperature and magnetic induction meters placed outside the heat chamber (not shown). The Hall transducer can be attached to open magnetic circuit base.

The device operates as follows,

In the compartment 2, the test permanent magnet 8 is placed coaxially with the open magnetic circuit 6 and close to the partition 4. Close the heat chamber with a cover 9 and set the temperature ti, and then t2, measured by a temperature meter with a sensor 5. A constant temperature to is maintained in the other compartment. e.g. melting ice. The magnetic circuit 6 concentrates the magnetic flux of a permanent magnet 8, which acts on the Hall transducer 7. The magnetic induction value is fixed by the magnetic induction meter 10. Since the partition is made of a material with a low coefficient of thermal expansion, the influence of the temperature change in the distance between the magnetic circuit 6 and, consequently, the Hall transducer 7 and the tested permanent magnet 9 can be neglected. At a constant temperature in compartment 3, the temperature coefficient of the magnetic induction of the permanent magnet 8 is determined by the following formula:

δ in _m

BT2 ^- VTs

ΒΓ _Μ (ΐ2 - tl) 'where d Vm is the temperature coefficient of magnetic induction of a permanent magnet;

VTs - magnetic induction measured by the meter at temperature c, in compartment 2; 2Q Bt2 - magnetic induction measured by the meter at temperature t2. in compartment 2.

Claims (1)

Claim 20 A device for measuring the temperature coefficient of magnetic induction of permanent magnets, comprising a heat chamber, a temperature meter, an open magnetic circuit, a magnetic induction meter with a Hall transducer, characterized in that, in order to improve the measurement accuracy, the heat chamber is made of two compartments with a partition made of non-magnetic material with a small thermal expansion coefficient of 40, while the temperature sensor is located in the first compartment, and the open magnetic circuit and the Hall transducer are located in another CCEE constant temperature.