SU1195300A1 - Method of inspecting quality of asynchronous machine squirrel-cage rotors - Google Patents

Abstract

The invention relates to instrumentation engineering and can be used to check the suitability of short-circuited rotors of asynchronous machines. The chain of the invention is to extend the functionality by defining the year -. rotor and increase control reliability by eliminating the effect of rotor speed: measurement error. The essence of the method is that the shaft of the controlled rotor is rigidly connected to the shaft of the reference rotor. Then both rotors are installed in the working magnetic fields, they are driven into rotation and signals are determined that are proportional to the conductivity of each rod. Then multiply the magnitude of the signals of the reference rotor by the scale factors, a preliminary -. but determined experimentally, and compare the magnitude of the signal (L of the controlled rotor with the results of multiplication. The comparison results determine the quality of the controlled rotor. In the description of the invention, the practical implementation of the proposed method is given. 1 Il.

Description

The invention relates to a test-measuring technique and can be applied to control the suitability of tightly closed rotors of asynchronous machines.

The aim of the invention is to expand the functionality due to the possibility of determining the degree of suitability of the rotor and increasing the reliability of control by eliminating the influence of the rotor speed on the measurement error.

According to the proposed method, the shaft of the controlled rotor is rigidly connected to the shaft of the reference rotor, both rotors are installed in working magnetic fields, they are rotated, signals proportional to the conductances of each rod are determined, the signals of the reference rotor are multiplied by predetermined large-scale coefficients compare the magnitudes of the signals from the monitored rotor with the results of multiplication, judging by the comparison results about the quality of the counter-matchable. rotor.

The drawing shows a diagram of a device implementing the proposed method .. The device includes a drive mechanism 1, a reference rotor 2, a controlled rotor 3 is not included in the device, is given to explain the principle of operation), sensors 4 and 5 of the conductivities of the reference and controlled rotors, the sensor 6 rotor, peak detectors 7 and 8, multilevel comparator 9, source 10 levels of reference voltages, recorder 11 .. Controlled and reference rotors 3 and 2 are in the working electromagnetic field, rigidly connected by shafts and the drive mechanism 1. The conductivity sensors L and 5 are contactlessly connected to rotor rods 2 and 3, the outputs of the conductivity sensors are connected, respectively, through peak detectors 7 and 8 to the input of the comparator 9 and the input of the source 10 voltage levels, to the reference inputs of the comparator 9 are fed the reference voltages from the source 10, the outputs of the comparator 9 are connected to the recorder, and the second input of which is connected to the rotor position sensor 6.

The device works as follows.

The drive mechanism drives the reference 2 and the controlled 3 rotors into rotation. The conductance sensors 4 and 5 produce voltages proportional to the conductivity of the rotor rods while they are above the rod. Peak Detectors 7

and -8 form pulses whose envelope voltage is equal to the amplitude of signals from sensors 4 and 5. The amplitude of pulses from peak detector 7 is multiplied by experimentally selected coefficients in source 10 of reference voltage levels and is applied as a reference voltage to multilevel comparator 9. On the second inputs of the comparator 9

There are 1 1 pulses, the amplitude of which is proportional to the conductivity of the rod of the controlled rotor .3. As a result of a two-threshold comparison of the monitored pulses with the pulses of the source of the reference levels from the outputs of the comparator 9, the signals of the comparison results are output. Comparator 9 outputs signal 1 at the corresponding output when comparing the control

roll signal with a corresponding normal reference voltage level. The output signals of the comparator 9 fall on the recorder 11, where the quality of the monitored rotor 3 is recorded, the number of reference voltages and signals of the cocharacter 9 are selected. They are based on the required quality selection of the controlled rotors 3.

Claims (1)

Invention Formula The method of quality control of short-circuited rotors of asynchronous machines, which means that a rotating controlled rotor is acted upon by a magnetic field, electrical signals are taken, the amplitude of which is proportional to the conductance of the rods of the counter-rotating rotor, and the amplitudes of the received signals are compared with reference values, different the purpose of expanding the functionality and increasing the reliability control, affected by magnetic the field on the reference rotor, rigidly connected to the shaft with the shaft of the controlled rotor, remove the electric Signals, whose amplitude is proportional to the conductivity of the rods of the reference rotor, according to the results of comparing the amplitudes of the received signals with the reference values, which are the amplitudes 1195300 dy electric signals of the reference rotor, previously multiplied by the corresponding scale. The coefficients determined experimentally judge the quality of the controlled rotor. g- 7 ten eleven