SU1148010A1 - Device for checking hysteresis electromagnetic clutch unit - Google Patents

Abstract

DEVICE FOR TESTING A BLOCK OF HYSTERESIC ELECTROMAGNETIC CLUTCHES, which is made of at least two couplings with control windings, containing a drive motor. A driver intended for connection with the leading coupling halves, a load simulator for connection with the driven coupling halves, a power source connected to the control winding terminals of one of the couplings, and a rotational speed measurement unit connected to the recording unit, characterized in that accuracy and reliability of tests, the rotational speed measurement unit is designed to connect to the terminals of the control winding of the second coupling and is made in the form of a serially connected rectangle impulses, differentiating unit, multiwheel waiting vibrator and integrator.

Description

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ABOUT

I1 The invention relates to electrical engineering, in particular to devices for measuring the parameters of electrical machines, and is intended to measure the parameters of electromagnetic hystereic couplings. . A device for testing, made in the form of a test bench dp of electrofusion, containing a drive motor, two belt brakes for dynamic loads, an electromagnetic shoe brake and a hydraulic brake, two tachometers for measuring the number of revolutions of the driving and driven parts of the coupling, and a photoelectric sensor for determining the cool right now .ij. The disadvantages of the known device are its complexity, as well as the inconvenience that arises when measuring the parameters of the couplings, due to the need to remove the investigated couplings from the object and install them into the measuring device (stand). It is also known a device for testing a hysteresis electromagnetic clutch unit, which consists of at least two clutches with control windings, containing a drive motor for coupling with driving coupling halves, a load simulator for coupling with driven coupling halves, a power supply connected to the control winding terminals of one of the couplings, and the rotational speed measurement unit connected to the recording unit 2. A device for testing a unit of two electromagnetic hysteresis couplings is known, the control winding of one of which is connected to a power source, contains an electric motor, a load simulator, a recording unit connected to two tachogenerators. The output shaft of the engine is kinematically connected to the input shaft of the clutch unit (with drive 1A and coupling halves) and VAPM of the first tachogenerator, and the output shaft of the clutch unit (driven half coupling) is connected to the load simulator and the second tachogener shaft. The outputs of the tachogenerators are connected respectively to the first and second inputs of the recording unit. Voltages from the tachogenerators are fed to the recording unit, in which quality a loop or an electronic oscilloscope can be used. The registration of the beginning and end of the acceleration of the driven part of the clutches is made by comparing the voltages with tachogenerators. As a result of the reading of the tachogenerator voltages as a function of the current in the control winding of one of the coupling blocks, its performance, i.e. dependencies of the moment on the output shaft of the coupling on the control current and transients at. acceleration of the driven part of the coupling. To remove the similar characteristics of the second clutch, which is part of the clutch unit, the power source is connected to the control winding of this clutch and, depending on the current in the control winding, the readings of the tachogenerators are measured. A disadvantage of the known device is its low accuracy, due to the necessity of comparing slightly different signals from two tachogenerators, as well. also low reliability due to the use of two tachogenerators in it. The purpose of the invention is to improve the accuracy and reliability of the tests. The goal is achieved by the fact that in a device for testing a hysteresis electromagnetic coupling unit, which is made of at least two couplings with control windings, containing a drive motor for connecting with driving coupling halves, a load simulator for connecting to the driven coupling halves, the power supply connected to the winding terminals of the control of one of the couplings, and the unit for measuring the frequency of rotation connected to the recording unit, the unit for measuring the frequency of rotation is designed for CONNECTIONS to kle1F1am obmotki.upravleni second sleeve 1 and is configured as a series-connected rectangular pulse shaper, differentsirunntsego block zhdutsego multivibrator and the integrator. On . 1 shows the block diagram of the presentation device; in fig. 2 and 3 - hysteresis coupling design; in fig. 4 is a diagram w illustrating the operation of the device. The proposed device (Fig. T) for measuring the parameters of unit 1 of hysteresis couplings 2 and 3, the control winding of one of which (couplings 2 are connected to power supply 4, contains an electric motor 5, a load simulator 6 and a recording unit 7. The input shaft 8 ( drive coupling halves of block 1 of clutches 2 and 3 connected by a shaft of an electric motor 5 and output shaft 9 (driven coupling halves) with a load simulator 6. The unit for measuring the rotational frequency is executed in the form of successively included 10 forcing pulses of the differential block 11, waiting The multivibrator 12 and the integrator 13, the pulse generator input 10 is connected to the control winding of the second clutch 3, and the integrator 13 output to the input of the recording unit 7. Each of the test hysteresis clutches 2 and 3 consists of a stator 14 with the control winding 15 placed on it inductor 16 and rotor cup 17 made of magnetically hard material. If using a motor 5 to rotate the drive coupling half (inductor 16) relative to the rotor 17 (driven coupling half) and apply voltage to the control winding 15, then in the air gap 18 of this muff A rotating magnetic field arises, reversing the active part of the rotor 17 (stationary or having a frequency of rotation less than the frequency of rotation of the inductor 16). As a result of the magnetic delay, t, e, the magnetic flux of the rotor 17 magnetizes the magnetic force of the stator 14, there is an electromagnetic moment entrains the rotor 17 in the direction of rotation of the inductor 16, to measure the parameters of the coupling 2 of the block, 1 of the couplings in the proposed device uses |: the effect of induction of an emf in the control coupling of the second coupling 3 in the presence of differences in the frequencies of rotation of the driving and driven coupling couplings. The principle of induction of EMF in a hank of control 15 without applying voltage to it when the leading part of the hysteresis clutch is rotated relative to the Vedas (it is similar to the behavior of the engine in the generation mode. At that, it is necessary to take into account d apoKCxo JT stereoisc motor due to supplying the stator winding with a 3-phase voltage, and in the hysteresis coupling by moving the rotor 17 and the inductor 16 relative to each other. In the presence of a slip between the inductor 16 and the rotor 17, an act of magnetization reversal occurs rotor 17 and, consequently, its magnetic permeability changes, which leads to a change in the magnetic flux and the appearance of an alternating voltage EMF in the control winding 15, the frequency of the change in magnetic flux and the induced EMF in the winding are proportional to the difference in the rotational frequency of the inductor 16 and the rotor 17 Since the number of poles of the inductor 16 of the hysteresis coupling is constant, then the frequency of the induced voltage in the control winding 15 is proportional to the relative frequency of the rotor 17. At the time of applying the voltage On the control winding 15 of the clutch 2, the rotational speed of the driven parts of both clutches is zero and on the control winding 15 of the second clutch 3, an alternating current voltage appears at a frequency corresponding to the rotational speed of the drive part of the clutch assembly 1. After acceleration of the driven part of the first clutch 2, to the control winding of which voltage is applied, to the frequency of rotation of its leading part, the driven part of the second clutch 3 begins to rotate with the same frequency, but in the opposite direction from its leading part. Thus, the relative frequency of rotation of the driven and leading parts of the second clutch 3 doubles, and therefore the voltage frequency across its winding 15 also doubles. From the acceleration time, the moment transmitted by clutch 2y can be calculated from the equation,;, (O - acceleration of development; 3 - moment of inertia of the load, reduced to the coupling shaft $ sg omeng load resistance. KHf reduced to the coupling shaft, Where "is the speed of rotation of the leading part of the coupling; regg acceleration time. Put (2) in (I), determine

SsOmdKS

LL

.t

ragg

Since S, M,

for a given volume

st

Since the magnitudes are constant and known, then by measuring the acceleration time of the driven part, it is possible to determine the moment transmitted by clutch 2.

The measurement of the parameters of electromagnetic couplings using the proposed device is carried out as follows.

The motor 5 drives the leading part of the block 1 of two hysteresis clutches 2 and 3, the control winding of one of which (clutch 2) is supplied from the power source 4. In this case, under the action of an electromagnetic field arising in this coupling, the leading part of block 1 of sleeves 2 and 3 carries along the driven.

To measure the acceleration time of the first clutch 2, the signal from the winding 15 of the control of the second clutch 3, 1 or second through the shaper 10 of the direct pulses (Fig. 4a), the differentiating unit 11 (Fig. 4S), the waiting multivibrator 12 (Fig. 4c), the integrator 13 is removed. (Fig. 4J) is fed to a recording device 7, where the increase in voltage level is recorded. As can be seen from FIG. 4e, the rise time of the voltage on the control winding of the second clutch 3 is equal to the acceleration time of the driven part of block 1 of clutches 2 and 3.

In order to remove the similar characteristics of the second clutch 3, the power source 4 is connected to the control winding of the second clutch 3, and the pulse shaper 10 is connected to the winding of the first clutch 2

The application of the proposed device allows to increase the accuracy and reliability of the tests (two tachogeyeratora having low reliability and short service life are excluded from the device; more reliable elements are used to measure the speed of rotation.

Compared with the base object, the bench for measuring the parameters of hysteresis couplings of the type MGB-1, 6-3 and MGB-2, 5-3 - the reliability of the proposed device has increased 5 times.

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Claims (1)

i DEVICE FOR TESTING A BLOCK OF HYSTERESIS ELECTROMAGNETIC CLUTCH, which is made of at least two couplings with control windings, containing a drive motor designed to connect to the drive coupling halves, a load simulator, designed to connect to the driven coupling halves, a power source connected to the terminals control of one of the couplings, and a speed measuring unit connected to a recording unit, characterized in that, in order to increase the accuracy and reliability of the tests, the hour measurement unit rotational speed is designed to connect to the terminals of the control winding of the second coupling I. configured as a series-connected the formation ₌ Vatel rectangular pulses differentiation S ferentsiruyuschego block f monostable multi- vibrator and integrator. * 448,010 1