SU1223151A1 - Transducer of shaft angular acceleration - Google Patents

Abstract

The invention is intended for use in automatic control systems of direct current electric drives as an acceleration sensor. The purpose of the invention is to expand the measurement range. For this purpose, an annular transformer 11 with coaxially arranged windings 12 and 13 is used, designed in such a way that the winding 12 can rotate relative to the winding 13, the latter is connected to the source 17 of an alternating square wave voltage of an audio frequency. To eliminate sliding contacts in the circuit of measuring winding 6, the Transformer 18 with coaxially arranged windings 19 and 20 is used. made in such a way that the winding 19 can rotate relative to the winding 20. The measuring winding 6 is connected to the winding 19 of the ring transformer 18, the winding 20 of which is connected to the input of the output driver. sensor signal, which in this case is a phase-sensitive rectifier 23. 5 Il. .i (About

Description

one

The invention relates to the field of measurement and is intended for use in automatic control systems of direct current drives as an acceleration sensor.

The purpose of the invention is to expand the measurement range.

FIG. 1 shows an acceleration sensor, a slit; FIG. 2 shows the electrical circuit of the sensor; in fig. 3 is a transverse section rotary stator with a pole-pole rotor; in fig. 4 and 5 - electromagnetic damper device

The sensor contains a stationary frame 1, in coaxial axillaries of which there is a pin of rotating body 2 and polp shaft 3. | rigidly connected with the rotating body 2. The free end of the hollow shaft 3, coming out of the fixed body 1, is attached

towards the end of the shaft whose acceleration is being measured. In the rotating housing 2 there are coaxially rigidly connected with this housing the stator 4, made of electrical engineering steel and with winding 4I excitation 5 and measuring b placed in it, the magnetic axes of the windings being shifted by 90 el. and a damper comprising a magnetic system 7 with a winding 8 excite, value, zhet

 rigidly connected to housing 2 and disk 9 fixed on one: Val with a pole-mounted rotor .10 made of laminated and placed

in the stator bore 4.

To eliminate sliding contacts in the supply circuits of the excitation windings 5 of the stator 4 and 8 of the magnetic system 7, a ring transformer 1I with coaxially arranged windings 12 and 13 is used, such that the internal winding 12 with the magnetic core 14 can rotate with the shaft 3 relative to the external winding 13 and the magnetic conductor 15, fixedly mounted in the housing 1. The internal (secondary) winding 12 of the ring transformer 11 is connected to the excitation winding 5 of the stator 4 and the black diode 16 to the excitation winding 8 magnet system 7 damper. The external (primary) winding 13 of the transformer 11 is connected to a source (unit) 17 of an alternating voltage of rectangular form of sound frequency, for example, 1500 Hz.

20

25

five

YU .

15

2231512

To avoid sliding contacts in the measuring winding circuit 6, an annular transformer 18 with coaxially arranged windings 19 and 20 is used, designed in such a way that the internal winding 19 with the magnetic core 21 can rotate with the shaft 3 relative to the external winding 20 and the magnetic core 22 fixedly mounted in case 1.

The measuring winding 6 of the rotating stator 4 is connected to the internal (primary) winding 19 of the ring transformer 18, the external (secondary) winding 20 of which is connected to the input of the sensor output signal generator, which in this case is the phase-sensitive rectifier 23.i

Wires connecting the internal windings 12 and T9 of transformers i and 18 with windings {excitation 5 and 8 and measuring 6 are located inside the hollow shaft 3.

The sensor works as follows.

When the hollow shaft 3 rotates in the bearings of the stationary housing 1, the housing 2 rotates along with this shaft. When the housing 2 rotates uniformly or in a stationary state, the rotor under the action of the excitation flow generated by the excitation winding 5, which is powered by the source 17 through the transformer 11, soot in relation to the winding 6 such a position, penetrating its magnetic flux is zero, and the EMF in this winding is also zero. With the accelerated rotation of the sensor, the dynamic moment needed for the accelerated rotation of the rotor 10, the damper disk 9 and their shaft is created by an electromagnetic moment acting on the rotor 10 from the stator 4 side through the excitation magnetic flux. At the same time, the rotor 10 rotates at some angle relative to the position with uniform rotation, the excitation magnetic flux lines in the bore of the stator 4 deform to take the shape of a Latin letter S and penetrate the turns of the measuring winding 6. In the measuring winding 6, a variable emf is induced which is proportional to 55 the rotation angle of the rotor 10. This angle is proportional to the electromagnetic moment transmitted to the rotor 10 from the stator 4 in accelerated motion.

thirty

35

40

45

50

ten

and the electromagnetic moment is proportional to the acceleration. Thus, the angle of rotation of the rotor 10 relative to the stator 4 is determined by the magnitude of the acceleration of the stator 4.

A proportional relationship between the EMF in the measuring winding 6 and the acceleration of the shaft 3 of the setter and the stator 4 rigidly connected with it is achieved by selecting the configuration of the poles of the rotor 10. The EMF of the measuring winding 6 is transformed with the help of a transformer 18 and a phase-sensitive rectifier 23 into an output constant voltage whose value is proportional to (5 is rational to the acceleration of the shaft 3 of the sensor, and the polarity is determined by the sign of acceleration. With abrupt changes in acceleration, the process of rotating the rotor 10 relative to the stator can be worn Electromagnetic damper serves to impart rotor 10 relative to the stature 4. Simultaneously with rotating the rotor 10 relative to the stator 4, the damper disc 9 rotates relative to the poles of the magnetic system 7, the excitation winding 8 of which is connected through the rectifier 16 to the secondary winding 12 of the transformer 11 and crosses the magnetic fluxes between the poles of this system.The interaction of currents arising in the disk 9 of the damper and the magnetic fluxes between the poles of the magnetic system 7 , creates a moment of resistance to the rotation of the disk 9 relative to the magnetic system 7, is proportional to 20

25

thirty

35

four

relative speed

Thus, the electromagnetic moment transmitted from the rotating stator 4 to the rotor 10 is balanced by the accelerating moment applied to the rotor 10 and the moment of resistance of rotation of the damper disk 9 relative to the magnetic system 7.

Claims (1)

Invention Formula Sensor for the angular acceleration of the shaft, comprising a housing, a stator made of magnetic material with a single phase excitation winding and a measuring winding, a rotor, a power supply unit and a sensor output driver, characterized in that, in order to extend the measurement range, it is equipped with two ring transformers and an electromagnetic damper, made of a disk and a magnetic system with an excitation winding, the stator being rigidly connected to the shaft and the magnetic system, the rotor is made in a pole and rigidly connected to the disk, the primary the windings of ring transformers are mounted on a stationary case, and their secondary windings are on the shaft, the power supply unit is connected via the first ring transformer to the excitation windings of the stator and damper, and the measuring stator winding is connected to the output signal shaper through the second ring transformer. 12 13 Sch 20 19 21 1.. . ./ / /. I  Г 1 i i / f / (j // / vW / X / X 79 JO 2 1 II / / I / FIG. A A FIG. five Fig a Editor E. Papp Compiled by A. Astakhov Tehred I.Popovich Proofreader S. Shekmar Order 1707/48 Circulation 778 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Branch PPP Patent, Uzhgorod, st. Project, 4 Subscription