SU1472854A1 - Device for checking non-symetry of teeth of magnetic circuit of electric machine - Google Patents

Abstract

This invention relates to instruments for monitoring high-precision electrical information machines during production. The purpose of the invention is to improve the accuracy and speed up the control process. The device contains a driver 1, a recording device 21 and a reading device, a sensing element and a variable voltage source 15. The reading device is made in the form of a multipole rotary transformer 3 and two chains of series-connected phase discriminator 16 and a pulse former 17 and a series-connected comparator 19 and phase-sensitive amplifier 20. The outputs of the first and second chains are connected respectively to the control input and the information input of the sample-storage device 18 , the output of which is connected to the recording device 21. The sensing element connected by the shaft 2 with the reading device and the checked magic The conduit 9 is made in the form of a detachable winding 14 "prong-pole" installed in the grooves of the tested magnetic core 9 of the rotor / stator / and the electromachine stator / rotor / 10, on which are placed two diametrically arranged adjustment coils 11, 12 and on one tooth installed measuring coil 13. Seat 8 for mounting the tested magnetic circuit 9 is provided with a movable element 7 allowing its radial displacement in two mutually perpendicular directions and allowing pre-centering of the 9. nitoprovoda 1 z.p.f BACKGROUND yl 6.

Description

one

The invention relates to electric machines, namely, devices for monitoring high-precision electric information machines during production.

The purpose of the invention is to improve the accuracy and speed up the control process.

FIG. 1 shows a block diagram of the device in FIG. 2 is a schematic diagram of a detachable winding tooth — a pole in FIG. 3; its waveform is a sweep; Figs. 4 and 5 show an example of the implementation of a movable element in two projections of Figs. 6 are the dependences of the EMF and the voltage of the circuit elements on the angle of rotation of the shaft.

A device for controlling the asymmetry of the arrangement of the teeth of the magnetic circuit of an electric machine contains a driver 1 in the form of a low-speed motor connected by means of shaft 2 with a reading device 3 made in the form of a multi-pole rotating transformer (W) with excitation winding 4 and secondary sinus 5 and cosine 6 windings . The shaft 2 through the movable element 7 is connected with a seat 8 for the tested magnetic core 9 of the rotor mounted inside the electromachine stator 10 "On the stator 10 there are two diametrically located adjusting coils 11e 12 and a measuring coil 3 mounted on one tooth water 9 rotor installed removable winding 14 prong - pole, which

five

0

five

0

five

together with the electrostatic stator 10 forms a sensitive element (SE) of the device. The excitation winding 4 of the reading device 3 is connected to the alternating voltage source 15 and to the reference input of the phase discriminator (PD) 16, to the information input of which the sinus winding 5 of the rotating transformer is connected. The output of the phase discriminator 16 through the pulse shaper 17 (FI) is connected to the control input of the sampling-storage device 18 (VHR), the cosine winding 6 of the multi-pole rotary transformer is connected via a comparator 19 to the reference input of the phase-sensitive amplifier 20 (FCF), to the information input which the measuring coil 13 SE is connected, and the output of the FCU 20 is connected to the information input of the storage sampling device 18, the output of which is connected to the recording device 21. The removable winding 14 is a tooth - the pole is connected to source 15 variable voltage. Adjusting coils 11, 12 and resistors 22, 23 are connected to a bridge circuit, to one diagonal of which is connected an alternating voltage source 15, and to another a measuring device 24, for example, a millivolt meter, which is an indicator of a circuit mismatch.

Removable winding 14 prong - pole is structurally designed as a plug connector (Fig. 2 and 3), consisting of a plug 25 to the socket 26 in the plug

rings 27, of insulating material, in which the drifts 29 of the plug and sockets 30 of the socket are reinforced. The output ends 31 of the winding 14 are connected to two adjacent sockets of the socket 26, the other sockets are interconnected in pairs by jumpers 32. On the plug 25, the plug 30 is also connected in pairs by jumpers 33, so that when the plug 25 is located on one side of the tested magnetic cable 9 With a socket 26 located on its other side, in the grooves of the tested magnetic core 9, a wave winding is formed with the number of poles equal to the number of teeth.

Sliding element 7, which provides the possibility of radial displacement of the axis of the seat 8 for the tested magnetic conductor 9 in two mutually perpendicular directions, can be structurally designed, for example, in the form of flanges (Fig. 4), one 34 of which is integral with the shaft 2 the other 35 is integral with the seat 8. The flanges are screwed together between themselves 36, the diameter of the holes under which in the flange 34 is greater than the diameter of the screws themselves, which allows the flange 35 to be radially displaced relative to the flange 34 when not completely screws 36. To adjust the radial displacement of the flange 35, screws 37 are provided, which are mounted in the vertical plane of the flange 34 in pairs in two mutually perpendicular directions.

The purpose of the movable element 7 is to center the inspected magnetic circuit 9 inside the electric machine stator 10. The need for centering is related to the fact that when the axis of the inspected magnetic circuit 9 is displaced relative to the axis of rotation, an error occurs in measuring the angular coordinates of the teeth.

In the absence of centering, the eccentricity value due to the landing gap between the inspected magnetowire 9 and the seating 8 on which it is installed, due to the beating of the working surface of the inspected

the magnetic conductor relative to its seating diameter and due to the beating of the seating relative to the axis of rotation may be 0.03-0.05 mm. Radius of royal machines

0

five

0

five

is in the range of 25-50 mm. As a result, the measurement error of the asymmetry of the location of the grooves can be +/- 2-6.88) coal. min

The tolerance for the asymmetry of the location of the grooves in precision electric machines such as multi-pole and two-pole BTs is ± (2-5), therefore the test error should be no more than ± (0.5-1) coal minutes, which is impossible to ensure without centering the checked magnetic conductor.

The preliminary centering of the magnetic circuit 9 relative to the axis of rotation of the electric machine is carried out in accordance with the method, which consists in that the centering is carried out by radial movement of the magnet guide 9 of the rotor being tested relative to the electric machine stator 10 using a movable element 7 in two mutually perpendiculars directions so as to provide the same imbalance values of the bridge circuit formed by the coils 11, 12 and the resistors 22, 23 in the two rotor positions differing by 180.

Thereafter, power is supplied from the source 15 to the winding 14 of the tooth — by the voltage installed on the tested magnetic conductor 9, and the excitation winding 4 of the reading device 3, as a result, an emf is induced in the output windings 5 and 6 and in the measuring coil 13 SE.

When the shaft 2 is rotated by the driver 1, these emfs change as a function of the angle of rotation ot as shown in FIG. 6, where E5, E6, E, 3- EMF on the windings 5, 6 and coil 13, with curve Eu rotates through zero values of 360 °

0

five

0

none of the angles multiples

(Z is a number

the teeth of the tested magnetic circuit 9), while the number of poles of the multi-pole VTZ reading device is equal to the number of teeth Z of the tested magnetic wire 9; curve zero points

do not match the angles to

360 °

on

the magnitude of the error of the K-th wave.

As can be seen from FIG. 1, the EMF E6 through the comparator 19 is fed to the reference input of the phase-sensitive amplifier 20, and the EMF E, 3 - to its information

51

entrance. Since the EMF of 6, changes the veil when rotated by one toothed case 360 °,

(angle), then output fj

phase sensing, the amplifier amplifier 20, the voltage U2o varies with the rotation angle vi, as shown in FIG. 6, i.e., in the area of the boundary of each tooth of the inspected magnetic circuit, the U20 curve has a linear section with a positive slope.

EMF E and voltage from source 15 are applied to phase discriminator 16, the output of which is voltage U (g, varying as a function of the angle of rotation of shaft 2 (Fig. 6). Voltage U1g after pulse former 17 turns into a sequence of short pulses U17. The pulses U are fed to the control input of the sample-storage device 18, the information input of which receives the voltage U zo from the output of the phase-sensitive amplifier 20, as a result, the voltage U, g appears on the output of the device 18 (Fig. 6).

The voltage U, g on each Kth segment of the abscissa axis, corresponding to the tooth division, is equal to the voltage value at the intersection point

U, n curve with k lines

360y

 f) n Jlrj iljrl tl ij-l JIXfj

(Fig. 6) Thus, the voltage U (8 on each K-m toothed division is proportional to the error of the K-th wave of the magnetic circuit 9. This voltage goes to the recording device 21, which can be used as a recorder or digital voltmeter.

Compared with the prototype, the proposed device has a higher accuracy of control due to the possibility of preliminary centering the tested magnetic core and an increase in sensitivity (ratio of useful signal to noise) due to the location of the excitation winding (removable winding 14) and secondary winding (measuring coil 13) of the sensitive element on different parts of its magnetic circuit, which allows us to increase the output signal of the sensitivity of the element and reduce the parasitic NL of vodka from the winding of the exciter28546

neither In addition, the continuous rotation of the shaft by the driver and the elimination of the need to stop the drive when measuring the position of each tooth accelerates the process of control and improves ease of operation.

Claims (2)

1. A device for controlling the asymmetry of the arrangement of the teeth of a magnetic circuit of an electric machine, containing 5 specifies, registers v a reading device, a sensing element, a source of alternating voltage and a comparator, the sensing element being connected by a shaft with a reading 0 device, and the seat is intended to be connected with the tested magnetic circuit; the driver device contains a motor, and the reading device is designed as a rotating transformer with an excitation winding and sine-cosine windings, characterized in that, in order to improve the accuracy and speed up the monitoring process, into it 0 entered in series connected phase discriminator, pulse shaper, sampling-storage device and phase-sensitive amplifier, the sensitive element is made in 5 as a detachable tooth-pole winding, designed to be installed in the grooves of the tested rotor magnetic circuit and an electromachine stator, on which two diametrically placed 0 located adjusting coils, and a measuring coil is mounted on one tooth, the seat for the tested magnetic circuit is provided with a movable element allowing 5 its radial displacement in two mutually perpendicular directions, with the reference and information inputs of the phase discriminator connected respectively to the excitation winding 0 of a rotating transformer intended to be connected to an alternating voltage source and its sine winding, and the cosine winding is connected to the input of a comparator, successively connected to a phase-sensitive amplifier, the output of which is connected to the information input of the sampling-storage device, the output of which is connected to registering A device with an information input of a phase-sensitive amplifier is connected to a measuring coil of a sensing element, the adjusting coils of which are connected to a bridge circuit, to the diagonal of which is connected a source of alternating voltage to which a winding pole-pole is connected. 2. The device according to p. I, differing from U and from the fact that the winding is removable the prong - the pole of the sensing element is designed as a plug connector, the socket and plug of which are intended to be placed on opposite sides of the tested magnetic conductor, the number of contacts is equal to the number of grooves of the tested magnetic conductor, and the contacts located within the annular zone are occupied by the grooves and connected in pairs in one and another part of the connector, form a wave winding. Jj 2 Jj Figz M fS Јb ABOUT e about. C. about. and about and about Uta ) F) 6) ) FIG. 6