SU564604A1 - Linear acceleration pick-up - Google Patents

Description

(54) LINEAR ACCELERATION SENSOR

 .. i

The invention relates to the field of information-measuring technology, namely, devices for converting linear mechanical accelerations into electric cranes.

A number of linear acceleration sensors are known, comprising a magnetic core, an excitation winding, or a permanent magnet measuring winding with a short lock, coil or transformer. Their disadvantage is the inconsistency of sensitivity over the measurement range l.

A pinewood sensor is also known, which contains a magnetic core with a measuring winding and a movable core 2,

However, errors in measurement are noted. This is due to the fact that when the core is moved, the length of the path through the steel of the magnetic circuit dp of the working magnetic flux closing through the core changes, which changes the magnitude of the working magnetic flux.

The magnitude of the working magnetic flux through the core

F.

one,. TO

i

(one)

,

. - - U

where Gr - EDC excitation winding, creating a working magnetic flux,

 magnetic resistance | air gaps between the core and the magnetic conductor,

K - core magnetic resistance,

iat magnetic resistance of the operating current dp.

It can be seen from formula (l) that the value of Fr does not vary in proportion to the change in FP, but also depends on R: which changes as the core moves. Therefore, the change in flux from the displacement of the core is non-linear, which will lead to the fact that the value of U D. in a short-circuited turn depends not only on the speed of the shift

core (at

but also from the position of the core

i.e.

 EH

AF

. (2)

Claims (2)

at Hence, in the measuring winding, along with the signal proportional to the acceleration, the signal that is proportional to the change in the position of the core, will be transformed, which introduces an error in the measurement. The chain of the invention is to increase the accuracy of guests' measurements. This is achieved by the fact that the magnetic conduit is made in the form of three hollow coaxially arranged cylinders, from one end of which there is a permanent magnet between the outer and inner cylinders, and from the other end between the middle and inner cylinders that the fluxes of both magnets are stacked in the magnetic core. Along the entire length of the middle piping across its longitudinal axis, it is wound with a short winding winding, closed to its other section, laid in the vigilance house with the measuring winding along the longitudinal axis of the outer and middle cylinders, covering them, and in the cavity between these cylinders there is a movable ring core. The drawing shows the described sensor. The sensor contains a magnetic conductor, performed as a three-hollow coaxially distributed paddle cylinder - outer 1, medium 2 and inner 3. From one end there is a magnetic conductor between outer 1 and insideHiiHM. The 3 cylinders houses a permanent magnet 4, and at the other end between the middle 2 and the inner 3 cylinders, a second permanent magnet 5, so that the fluxes of the permanent magnets 4 and 5 are folded in the magnetic system. A section 6 of a short-circuited winding is wound across the middle cylinder along its entire length. It is closed on section 7 of the same winding, laid together with the measuring winding 8 along the longitudinal axis of the cylinders 2, encompassing them. In the cavity between cylinders 1 and 2 there is a movable ferromagnetic colpe core. The magnetic flux of permanent magnets is closed through cylinder 1, core 9, cylinder 2, magnet 5, cylinder 3 and magnet 4. When the core 9 is moved, the closure through it causes the magnetic flux to induce a current in the coils of section 6 of the EMF proportional to the speed of the core. The electrical current of section 6 closes through section 7 and creates a starHHT flow, which closes in imag 1 and 2 across their longitudinal axis. When changing the rate of the reversing of the sortie 9, the current in a short-circuited oGNroTKe changes in proportion to the magnetic field, induced by section 7 in the cylinders 1 and 2, which, in turn, induces its speed in the charging winding 8 MAC, speed, and the speed of change; i.e. proportional to the change in speed of the nopeNfomenuR of the core 9. When the core moves along the cylinders, the path length dp of the magnetic flux remains unchanged over the entire measured range, which justifies the constant magnetic flux of the working magnetic flux kayuschegos through the core, the current in a short-circuited winding independent of the coordinate position of the core. This increases the accuracy of measurement. DETAILED DESCRIPTION OF THE INVENTION A linear acceleration sensor comprising a magnetic core with a measuring winding and a movable core, characterized in that, in order to improve the measurement accuracy, the magnetic core is made in the form of three hollow coaxially arranged cylinders with CONSTANT magnets at the ends, one of which is located between the outer and the inner cylinder, and the second between the middle and inner KKM in such a way that the fluxes of both magnets are folded in the magnetic core, moreover, along the entire length of the middle cylinder across its longitudinal axis is wound the section of the short-circuited winding is closed on its other section, laid together with the measuring winding along the longitudinal axis of the outer and middle nipindra, grasping them, and in the cavity between these cylinders there is a movable ring core. Sources of information taken into account in the examination: 1. USSR author's certificate number 42O936, cl. q 01, p 15/08. 197.2 2. USSR author's certificate number 169903, cl. q O1 P 15/08, 1963 J