SU1450607A1 - Device for indirect inspection of air gap non-uniformity in electric machines - Google Patents

Abstract

The invention relates to electrical measuring technology and can be used to control the non-uniformity of the air gap of an induction motor with a gear rotor with a connection of windings both in a star and in a triangle, as well as powerful machines in all areas of the national economy that produce or operate electrical machines. The aim of the invention is to expand the field of use due to the possibility of testing electric machines with connecting windings both in a star and in a triangle and electric machines of various power during operation and improving speed. For this, a current sensor 5, 6, 7 is included in each of the three linear wires. The signal from the current calendar passes through its filter of filter block 12, tuned to the frequency of the harmonic harmonics, and is fed to the input of the corresponding converter block 13, which converts it to a form suitable for further processing (e.g., direct voltage or digital code). From the output of the conversion unit 13, three signals proportional to the amplitudes of the toothed frequency currents in the linear wires are squared by the corresponding elements of the block 14 and added to the adder 15, the output signal of which is proportional to the sum of the squares of the toothed frequency currents in the linear wires is fed to the first indicator 16 the control, calibrated in units of measurement of the non-uniformity of the gap, as well as at the first input of the comparator block 17, to the second input of which a signal is output from the block 18 for setting the threshold value. The rotor of the test machine 11 rotates in this case. If the signal at the first input of the comparator 17 is exceeded by a signal at its second input, the signal from the output of the comparator block 17

Description

one

The invention relates to electrical engineering technique and can be used to control the air gap non-uniformity of a gear-type asynchronous electric motor.

with a connection of windings both in a star and in a triangle, as well as powerful machines in all areas of the national economy that produce or operate tjyKsuHX electrical machines.

The purpose of the inventor is to solve the oCjiadTji technology by providing the opportunity to test electrically operated machines with connection of windings both in the star and in the half-heads and electric machines of different power in the process of operation and speed performance.

The drawing shows a structural block diagram of this device, where 1 is a three-phase power source, 2, 3, A are three-phase power supply phase wires connected via current sensors 5f 6, 7 to terminals for connecting stator windings 8, 9,

An electrically operated machine 10, the output of each of the three current sensors 5, b, 7 through a series connected filter unit 12, the conversion unit 13 and the square unit 14 are connected to one of the three inputs of the three-input adder 15, the output of which is connected to the input of the first indicator 16 control

and with the first input of the block 17, the second input of the block 17 compares the connection with the output of the block 8, setting the threshold value, the second indicator 19 of the control.

, As the measured indirect parameter, according to the change of which is judged on the presence of eccentricity, the squares of the amplitude of the sound frequency in the linear wires are taken.

The device works as follows,

Test the electrite-geska mash1sha

1i receives three-phase power to the rear ends of the stator windings 8, 9, 10 from 9 three-phase phases 2, 3, 4 three-phase power source 1, the rotor of the test machine 11 rotates JB each of the three l-wires of the current sensor 5, 6, 7. Cyp- gal

from each current sensor, pass through the next filter of the filter unit 2, tuned to the frequency of the tooth harmonic, to the input of the corresponding converter unit 13, which converts it into a form suitable for. further processing (e.g., direct voltage or digital code), C

the output of a three-signal transform block | proportional to the impedance currents of the toothed frequency in the linear wires, are squared

by the corresponding elements, blocks 14 are squared and put in cyj-tMHTOpe 15. From the output of the adder 15

the signal proportional to the sum of the squares of the toothed frequency currents in the linear wires is fed to the first control indicator 16, calibrated in units of non-uniformity

gap, as well as the first input of the block 17 of the comparison. The second input of the comparator unit 17 receives a signal from the output of the unit 18 for setting the threshold value. The signal of the threshold value setting unit 18 corresponds to the sum of the squares of the toothed frequency of the linear wires corresponding to the maximum allowable unevenness of the air gap. If the signal at the first input of the comparison block 17 is exceeded by the signal at its second input, the signal from the output of the comparison block 17 is fed to the input of the second control indicator 19.

. Thus, this device provides an extension of the field of use and an increase in speed.

Odd -1ula inventions

A device for indirect control of the unevenness of the air gap of electric machines with a gear rotor and a three-phase winding on the stator, containing a three-phase power supply source, sensors forformative signals, a filter unit connected in series, a conversion unit, a squaring unit and an adder, an analysis unit whose first input is connected with the input of the first indicator, and the output with the input of the second indie

distinguished

the fact that, with the aim of expanding the scope of application by providing the possibility of controlling electrical ma-siHH with connecting windings both in a star, and in triangles and specular ma: l-gK of different power in the process of working and increasing speed, it has a block for setting the threshold value, the sensors of informative signals are implemented as

current sensors, a filter unit, a conversion unit, a squaring unit and an adder are made of three inputs, and a three-phase power source through current sensors

connected to the stamps to connect the terminals of the corresponding phases of the winding of the electric motor type, the output of each current sensor is connected to

.

the corresponding input of the filter unit, and v (the stroke of the adder is connected to the first input of the analysis unit, terminated as a comparison unit, the input of which is connected to the output of the threshold value setting unit.

Claims (1)

30 claims A device for indirectly controlling the unevenness of the air gap of electric machines with a gear rotor 32 rum and a three-phase winding on a stator, containing a three-phase power supply, informative signal sensors, series-connected filter unit, conversion unit, squaring unit 40 and adder, analysis unit, the first input of which connected to the input of the first indicator, and the output to the input of the second indicator, characterized in that, in order to expand the scope of application by providing the possibility of electronic control tricky machines with windings connected both to a star and to triangles and electric machines of various powers during operation and increased speed, a threshold value setting unit is introduced into it, informative signal sensors are made in the form of current sensors, a filter unit, a conversion unit ,. the squaring unit and the adder are three-input, while the outputs of the three-phase power source are connected via terminals to the terminals for connecting the terminals of the corresponding phases of the winding of the electrical machine under study In other words, the output of each tocho sensor is connected to the corresponding input of the filter unit, and the adder output is connected to the first input of the analysis unit, made in the form of a comparison unit, the second input of which is connected to the output of the threshold value setting unit.