SU1709273A1 - Device for measuring tractive characteristics of electromagnets with movable cores - Google Patents

Abstract

The invention relates to test installations and may be used by the electrical industry when testing electromagnets. The purpose of the invention is to automate and improve measurement accuracy. The control unit 8 generates a signal for setting the initial working stroke of the core of the electromagnet 4 by means of the electric drive 3. Then the block 8 generates a signal for unlocking the key 9. which connects the coil of the electromagnet 4 to the power source. After that, the current sensor 10 generates a signal about the end of the transient process in the electromagnet and block 8 generates a signal for measuring force and displacement using sensors 1 and 2. Then key 9 turns off electromagnet 4 and block 8 generates a signal for changing the core stroke by a specified step. 2 illustrationsl

Description

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figure 1

The invention relates to test installations and can be used in the electrical industry when testing electromagnets.

The purpose of the invention is to automate and improve measurement accuracy.

FIG. 1 shows a block diagram of the device; in fig. 2 - mechanical part of the device.

The device consists (Fig. 1) of sensors 1 and 2 of force and displacement 2, electric drive 3, coil of electromagnet 4 and block 5, made in the form of digital blocks 6 and 7 with memory indication, connected to the corresponding outputs of sensors 1 and 2, K The start inputs of the digital blocks 6 and 7 of the display are connected to the first output A of the control unit 8 with an adjustable time delay from the moment the voltage is applied to the coil of the electromagnet until the moment of force measurement and movement. The second output B of the control unit 8 is connected to the electric drive 3 for moving the core of the electromagnet, the third output C to the input of the switch 9, through which a supply voltage is applied to the coil of the electromagnet. The voltage Un of the power supply is supplied to the switch 9 via the current sensor 10. The output of current sensor 10 is connected to input D of control unit 8.

The mechanical part of the device (Fig. 2) contains a base 11, on which the subject electromagnet 4 and two hollow posts 12 are fixed. A frame 14 is attached to the posts 13 on the bars 13 and the plate 15 is welded to it. A sensor is mounted between the fixed plate 15 and the movable plate 16 1 effort. The plate 16 is fastened with four pins 17 to the plate 18, on which the actuator 3 is fixed. The actuator 3 is connected by a rod 19 to the core 20 of the electromagnet 4 under test, mounted on the base 11.

The device works as follows.

The output control unit 8 generates a signal for setting the initial working stroke of the core of the electromagnet 4. This signal is processed by the electric drive 3. Then the output for the control unit 8 is a signal for unlocking the switch 9, through which the supply voltage Un is applied to the coil of the electromagnet 4. After This current sensor 10 generates a signal about the end of the transition process 8 electromagnet. In this case, the control unit 8 generates a signal at the output A to perform measurements of the force and movement of the core of the electromagnet. Force and displacement measurements are performed.

synchronously taking into account the drawdown of the sensor 1 force and all mechanical connections of the device design. Measurement results are indicated by display units 6 and 7.

After the measurement process is completed, the voltage Un is removed by the key 9 from the coil of the electromagnet 4. The control unit 8 at the output B generates a signal for changing the core stroke by a given step,

which drives the electric drive 3. For each value of the stroke, a voltage is applied and the force and movement of the electromagnet 4 are measured. Measurement of the characteristic

ends when the maximum movement of the electromagnet core is reached.

Claims (1)

Invention Formula A device for measuring the tractive characteristics of electromagnets with a movable core, containing a terminal for connecting an electromagnet power source, an electric movement electromagnet core, force sensor, displacement transducer, frame for mounting electromagnet, electric drive and said displacement transducer and force transducer, displacement transducer block and displacement transducer block, characterized in that, for the purpose of automation and improvement of measurement accuracy, a control block with one an input and three outputs, a key with a control input and two power terminals, a current sensor with a measuring output and two power terminals, moreover Cozy corresponding blocks with digital indication, each of which is equipped with a start input and a measuring input, the output of the force sensor is connected to the measuring input of the force display unit, and the output of the motion sensor is connected to the measuring input of the movement indication unit, the start inputs of the force and movement display blocks are connected to the first the output of the control unit, the second output of the control unit is connected to the electric movement of the electromagnet core, the third output of the control unit is connected to the control input m of said key, one of the current sensor is connected to the power terminals for connecting terminal the power source of the electromagnet, another power lead current sensor through the power leads of the specified key connected to the coil of the electromagnet, the measuring output of the specified current sensor is connected to the input of the specified control unit. Fig2