RU2531208C1 - Translational movement electromechanism - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: translational movement electromechanism consists of an electric motor, a rod with screw pair and kinematic gear. Control and monitoring of the electromechanism rod position is made by two analytic Hall sensors placed under angle of 90° towards each other, in parallel to double-pole cylindrical permanent magnet with diametrical magnetization. The magnet is mounted at the kinematic gear roller. Absolute angle corresponding to the actual rod position is defined against the ratio for the valid output voltage values of Hall sensors, which are received during rotation or fixed position of the permanent magnet.

EFFECT: improving playback accuracy for the rod movement and capability of permanent monitoring of the rod position.

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Description

The invention relates to aircraft electric drives, in particular to translational action electromechanisms, and can be used in other fields of technology.

The known electromechanism (patent RU No. 2277195 C2 dated 02/07/2003), consisting of a reversible valve electric motor with an integrated electromagnetic brake clutch and control box, gearbox, ball screw with output link and microswitch unit. As a prototype, the patent indicates the electromechanism of translational action MP10S2.5A14, made by JSC "Electric drive".

Due to the fact that the requirements for reliability, increased manufacturability and an increase in the resource of work are constantly being tightened to aviation electric drives, this electromechanism has disadvantages:

- the complexity and low tech microswitches actuation device;

- wear of contacts of microswitches;

- lack of control of the intermediate position of the electromechanism.

Closest to the claimed one is the electromechanism (US patent No. 7105801 B2 dated 04/02/2004), consisting of an electric motor, a rod with a pair of sliding friction, a kinematic gearbox with a special spindle, for transmitting the movement of the blade on which optical proximity sensors are installed that control moving the rod.

The patent description indicates the possibility of using a Hall effect sensor as a switch. The switch includes a magnetic field source, a detector that detects the magnetic field and a blade interrupter that blocks the magnetic field.

The proposed electromechanism has the following disadvantages:

- the presence of a blade moving along the lead screw is not technologically advanced and complicates the design;

- overlapping of the optical or magnetic source with a blade chopper causes errors associated with the so-called floating point;

- the complexity and complexity of settings and adjustments at rigidly set positions of the stem stop;

- the need for disassembling the electromechanism to adjust the stroke of the rod.

The task of the invention is to increase reliability, increase the service life, reduce the complexity of manufacturing an electromechanism and reduce its overall dimensions, expand and simplify the control and monitoring of the stroke of the electromechanism.

The technical result of the invention is to simplify the design and controllability, there is no need to disassemble the electromechanism to adjust the stroke of the rod and the ability to constantly monitor the position of the rod.

The problem is solved as follows.

An electromechanism of translational action is proposed, comprising an electric motor, a rod with a helical pair and a kinematic gearbox, the control and control of the position of the rod in which is carried out using two analytical Hall sensors located at an angle of 90 ° relative to each other, parallel to the plane of a bipolar cylindrical magnet of diametrical magnetization, and the absolute the rotation angle of the kinematic gear roller, corresponding to the actual position of the rod, is determined by the ratio of current values yhodnyh voltages of the Hall sensors obtained when rotating or fixed position of the permanent magnet.

Figure 1 shows an example of a translational action electromechanism, general view; figure 2 is a roller element with a magnet and a Hall sensor board; figure 3 is a structural diagram of a control unit of the electromechanism of translational action with a valve motor.

The translational electromechanism of FIG. 1 comprises a valve motor 1 with three rotor position sensors 12 and a parking brake clutch 13, shown in FIG. 3, a gearbox 2, a kinematic gearbox 3, a roller 4 with a permanent magnet 5, shown in FIG. 2, rod 8 , the lead screw 7 and the board with the Hall sensor 6. The control unit of figure 3 contains a microcontroller 9, a driver 10 and an inverter 11.

The electromechanism of translational action works as follows. The microcontroller 9 receives the control signals "Release", "Cleaning", generates a signal that, through the power switch, supplies voltage to the winding of the clutch of the parking brake 13 of the electric motor 1. The microcontroller 9 reduces the voltage of the winding of the clutch of the parking brake 13 to a holding voltage. At the same time, the microcontroller 9, analyzing the state of the position sensors of the rotor 12 of the electric motor 1, starts to accelerate the electric motor 1 to the set speed, generating signals coming through the driver 10 to the power switches of the inverter 11, which switch the windings of the electric motor 1. When the electric motor 1 is turned on, the rotational movement through the gear 2 and kinematic gear 3 is transmitted to the roller 4 with a permanent magnet 5, which rotates over a full stroke of the rod through an angle of 270 °, while the voltage at the output of the Hall sensor chips and 6, for example, a Hall sensor of the DHK-0.5 type with an additional amplifier, varies in the range from 0.5 to 4.5 V according to a sinusoidal law:

U ₁ = K ₁ · sinx,

since the second Hall sensor 6 is offset from the first by 90 °, the voltage at the output of its microcircuit changes according to the law:

U ₂ = K ₂ · sin (90 ° ± x) = K ₂ · cosx,

where U ₁ is the voltage at the output of the microcircuit of the first Hall sensor;

U ₂ - voltage at the output of the chip of the second Hall sensor;

x is the angle of rotation of the magnet 5;

K ₁ , K ₂ are constants.

The microcontroller 9 analyzes the ratio of the voltages from the outputs of the microcircuits of the Hall sensors 6:

, $$\frac{U_{\mathrm{one}}}{{\mathrm{<figure-callout\; id="2"\; label="U"\; filenames="00000004.png"\; state="\{\{state\}\}">U</figure-callout>}}_2}=\frac{K_{\mathrm{one}}\cdot \sin x}{K_2\cdot \cos x}=\frac{K_{\mathrm{one}}}{{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="00000004.png"\; state="\{\{state\}\}">K</figure-callout>}}_2}\tan x$$

,

Accordingly, controlling this ratio with the help of a microcontroller 9, which is a part of the translational action electromechanism control unit, it is possible to set different values of the turning off moment of the electric motor 1 within the stroke of the rod 8. Moreover, the limits of the stroke of the rod 8 are adjusted without disassembling the translational action and any or mechanical adjustments. The use of the voltage ratio from the outputs of the microcircuits of the Hall 6 sensors makes it possible to simplify the recognition of the actual position of the rod 8, in addition, it can significantly reduce the error in the position of the rod 8, which occurs under different temperature conditions of operation of the translational action electromechanism, especially in aviation and astronautics, since the microcontroller 9 analyzes the relative the error, and not the absolute, associated with temperature fluctuations in voltage from the output of the microcircuit of Hall sensors 6. This the approach allows to increase the accuracy of working out the stroke of the rod 8. In the same way, the translational action electromechanism is implemented with a direct current electric motor, asynchronous or synchronous electric motors.

Monitoring the position of the rod 8 can be carried out through a serial interface, through which the microchips of the Hall sensors 6 provide information about the current position of the rod 8.

Thus, the technical result has been achieved, the tasks have been completed and a new, more accurate, robust, robust design with a reduced number of parts has been created that is resistant to external factors. Electroprivod OJSC manufactured and tested electromechanisms of progressive action with the control of non-contacting Hall sensors according to the proposed technical solution, which is confirmed by act No. 30-14 / 12-2013.

Claims (1)

Electromechanism of translational action, consisting of an electric motor, a rod with a helical pair and a kinematic gearbox, characterized in that the position and control of the rod position of the electromechanism is controlled by two analytical Hall sensors located at an angle of 90 ° relative to each other, parallel to the plane of a bipolar cylindrical permanent magnet diametrical magnetization installed on the kinematic gear roller, and the absolute angle of rotation of the kinematic gear roller, s Resp actual position of the rod is determined by the relative current values of the output voltages of the Hall sensors obtained when rotating or fixed position of the permanent magnet.

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