SU995145A1 - Method of determining mechanical parametrers of electromagnetic relays - Google Patents

Description

(54) METHOD FOR DETERMINING MECHANICAL PARAMETERS OF ELECTROMAGNETIC RELAYS

one

The invention relates to a technique for measuring the mechanical characteristics of electromagnetic relays and can be used in their design and manufacture.

There is a known method of measuring contact pressure by informing the reed switch body of an increasing angular velocity prior to the moment of opening the contacts and judging by its value the strength of contact pressing 1.

However, this method is not very suitable for determining the stiffness of the elastic links of the electromagnetic relay due to different designs and the lack of information about the strain values.

The closest to the proposed technical entity is a method for determining the mechanical parameters of electromagnetic relays by driving the core when DC is fed into the relay and fixing the moment of the moment of the core and the moving contact, the moment of contact closure by changing the current depending on the position of the core 2 .

The known method also does not provide for the direct determination of the stiffness of the elastic elements of the contact and core system, since it does not allow us to determine the force of attraction at characteristic points of the path of motion of the core.

The purpose of the invention is to expand the functionality by automatically determining the stiffness of the elastic elements of the contact and root relay systems.

The goal is achieved by the fact that according to the method of determining mechanical

, Q parameters of electromagnetic relays by driving the core when direct current is fed into the relay and fixing the moment of moving the core and the moving contact, the moment of closing the contacts by changing the current depending on the position of the core, additionally the relay reports angular acceleration opposite to movement cor, and fix the magnitude of the angular acceleration at the time of moving the core and the moving contact and at the time of contact closure, and taking into account

20 moments of inertia of the moving parts of the relay and the values of the stroke of the core calculate the stiffness coefficients of the elastic elements.

The drawing shows the block diagram of the device for implementing the method.

The device contains an electric motor 1 with an adjustable angular acceleration of the rotor, on the shaft of which the test relay 2 is fixed so that the axes of the rotor shaft and the relay core coincide.

In conjunction with relay 2, the angular acceleration sensor 3 is fixed, the output of which is connected to the input of amplifier 4. Electronic switch 5 is connected to the output of amplifier 4 by one input, and output to one of the inputs of amplifier 6. A constant voltage unit 7 is connected to the winding of the relay under test 2 and maintains the constancy of the electromagnetic force of the attraction of the core of the relay 2.

To register the voltage and current to the winding of the relay 2, the input of the block 8 is connected, the output of which is connected to one of the inputs of the software block 9. A command pulse corresponding to the contact closure torque of the tested relay 2 outputs a block 10 whose input is connected to the winding of the relay 2, and the output is connected to another input of block 9. Block 9 is connected by an output to the input of key 11, to one of the inputs of memory block 12 and to another input of key 5. One input of multiplier 13 is connected to key 11, the other input is to output of amplifier 6, and output - with another input of amplifier 6. Output User 6 is simultaneously connected to another input of memory unit 12. The output of memory block 12 is connected to one input of indicator 14 and the input of block 15, the output of which is connected to another input of indicator 14.

The stiffness parameters of the elastic elements of the contact and core system are determined on the basis of analytical functional dependencies.

c, c-fC, -: j- | -e2

e.

01

L.

0

- .z + 1

i.

e.

where c is the spring constant of the core; WITH; - spring stiffness coefficient

moving contact; © 1 - the angle of turning the box until

touching contacts; - angle of turn

full contact closure; , - angular acceleration when turning

cor at angle i; 2 angular acceleration when turning

core angle

T is the moment of inertia of the moving parts of the relay.

The method for determining the mechanical parameters of electromagnetic relays is as follows.

By adjusting the amount of acceleration acting on the relay, it reaches the moment when the measles rotates through an angle ©. At this moment, block 8 gives out a pulse for the program block, which produces signals for opening electronic keys 5 and 11, and signals proportional to iH © 1 are sent to the inputs of the amplifier 6, the output of which produces a signal proportional to the stiffness coefficient C. At the same time, a control signal is received from the program block 9 for the memory block 12, which stores the value C and transmits it to the indicator register 14. P and dalneyschem increasing acceleration reach the moment when the contacts are closed relay. At this point, block 10 gives out a pulse, which also enters the software

block 9. The sequence of operation of the device is repeated, however, in this case, the output of amplifier 6 generates a signal proportional to the stiffness C + Cj, which is stored by memory 12, and in block 15 the value Ci is determined to enter another indicator register 14. After This one cycle of use of the device ends and on the indicator 14 the values of the coefficients of the elastic elements of the contact and the root relay systems are visualized.

The invention makes it possible to fully automate the process of measuring the mentioned mechanical characteristics of the relay, which, in turn, increases the accuracy and speed of measurements.

The stiffness parameters of the return springs of the core and the contact springs determine the functional capabilities of the relay and its quality, directly affecting

vibration resistance and vibration strength of the relay, for the duration of the contact spring and core bounce when the relay is activated and released. The stiffness of the springs strongly depends on the build quality. Therefore, the proposed method can be used at the output

non-destructive control of the relay from the production for their sorting, as well as to automate the process of vibration testing of plug-in relays.

Claims (2)

1. USSR author's certificate number 440717, cl. H 01 H 49/00, 1972. 2. USSR author's certificate No. 733045, cl. H 01 H 49/00, 1978 (prototype).