SU525151A1 - Device for testing multipole angle sensors - Google Patents

Description

(54) DEVICE FOR INSPECTION OF MULTIPOLUS ANGLE SENSORS

12

connected to a two-pole rotating transformer and an executive motor, a two-pole rotating transformer is connected to the recording unit through a fourth detector, a high-frequency voltage source connected to the rotors of the auxiliary and reference multi-pole sensors and to the second inputs of the first and third synchronous detector.

The circuit of the proposed device is shown in the drawing, where a tested multi-pole sensor is shown, consisting of a rotor 1 with a winding (the sensor windings in the figure are conventionally shown in black sections) and a stator 2 with a sinus and cosine windings. The auxiliary multi-pole sensor consists of the rotor 3 and the fixedly mounted stator 4. The rotor of the auxiliary sensor is rigidly connected to the rotor 5 of the reference multi-pole sensor, the stator

6 which is made movable and kinematically connected (for example via a coupling) with the rotor 1 of the sensor being tested. Rotor auxiliary sensor 3 through a reducer

7 is connected to the shaft of the synchronous motor 8, which is connected through the gearbox 9 also

with rotor 1 of the sensor being tested. The windings of the rotors 3 and 5 of the auxiliary and reference sensors are connected for the purpose of a contactless conductor through air transformers (not shown in the drawing) to an increased voltage frequency source

10 (2O + 50 kHz). The stator winding 4 of the auxiliary sensor is connected to the input of the first synchronous detector 11, and the windings of the stator 6 of the reference sensor through an air transformer (not shown in Fig. 1) are connected to the input of the second synchronous detector 12. The second inputs of the detector

11 and 12 are connected to a source of increased frequency 10. The output of the first synchronous detector 11 is connected to the input of the phase shifter 13, the output of which is connected to one input of the third synchronous detector 14, to another input of which the output of the second synchronous detector 12 is connected. connected to the input of an amplifier 15 connected to an executive motor 16, which is kinematically coupled through a reducer 17 to a rotor of a bipolar rotary transformer 18 and to a rotor of a phase expansion cable

13. The output of the transformer is connected to one input of the fourth synchronous detector 19, the other input of which is connected to the power source 20 of the rotor winding, checking the capacitance of the sensor (with a voltage frequency of 500 Hz). The output of the fourth synchronous detector is connected to the registering unit 21. The synchronous motor 8 of the rotor drive of the sensor under test is connected to the power source 23 (with a voltage of 50 kHz) and through the synchronous motor 22 of the paper tape to the recording unit 21.

The checked, external and auxiliary sensors have the same number P of pole pairs (i.e., the same electrical reduction factors). The reference and auxiliary sensors may be identical to the sensor being tested, except that their sine and cosine windings are connected in series, forming one winding on the stator (there is a solid black line in the stator 4,6).

The proposed device operates as follows.

The synchronous motor 8 rotates through the reducer 9 the rotor 1 of the sensor under test with the rotational speed N (in rev / s), and through the reducer 7 - the rotors 3 and 5 of the auxiliary and reference sensors with the rotation frequency P (in rev / s). Gear ratios reduk: tori 7 and 9 are chosen from the condition: P.

When powering the rotors 3 and 5 with a voltage of increased frequency (O-5O kHz), the induced voltages are removed from the winding stators 4 and 6, and they are balanced modulated in amplitude by the rotation angle of the rotors 3 and 5. The envelopes of these voltages are extracted using synchronous detectors 11 and 12. At the same time, the frequency of the voltage at the detector output 11

,

and the frequency of the voltage at the detector output

 (n + n) p (2)

These voltages, one directly and the other through a bipolar phase shifter 13, are fed to the inputs of the synchronous detector 14, the voltage from the output of which is amplified by the amplifier 15 and the actuating motor 16 rotates, transmitting through the gearbox 17 the motion of the coupled rotors of the phase shifter 13 and the transformer receiver 18. When they rotate with the frequency of rotation fl (r / sec), the voltage frequency at the output of the phase shifter receiver

3 2

etc.

in the steady state operation frequency f 2 ff. the voltages supplied to the input of the detector 14 must be equal, t, e. (n + N) p. (4) After simplifying the expression (4), we obtain Pfp Np. From the compression (5), it follows that the rotors of the machines 13 and 18 rotate by a factor of J times more than the rotor of the sensor being tested. When the tested sensor is powered from a network with a voltage frequency of 50 - 5OOHz, the output induced voltages on the stator windings 2 are balanced modulated in amplitude by the rotation angle of the rotor 1 according to the law of sine and cosine at the frequency of NPf6) Voltage from the stator windings 2 is supplied to the sine and cosine stator windings of a two-pole rotating transformer-receiver 18, the rotor of which rotates at a rotational speed. When condition (5) is fulfilled, as well as at ideally accurate sensor being tested and transformer-receiver 18, the voltage at the output of receiver 18 is equal to zero, since the condition

t

-0.

P

etc

If the sensor under test has an error, the condition tV) is violated, a voltage proportional to this fault appears at the output of the transformer-receiver, which is converted by a synchronous detector 19 into a signal of a slowly varying direct current, recorded by the recording unit 21 on paper tape.

The power supply of the synchronous motor 22 of the paper tape from the power source of the synchronous motor 8 of the rotor drive of the sensor being tested is necessary for obtaining on the graph paper tape an abscissa axis corresponding to the angle of rotation of the rotor of the sensor being tested. The axis of ordinates corresponds to the error of the sensor being tested.

The error of the proposed device consists mainly of the instrumental errors of the reference and auxiliary sensors, the transformer 18 and the phase shifter 13. The errors of the reference and auxiliary sensors are an order of magnitude smaller than the errors of the sensor being tested, despite their identity. The main component of the error of multi-pole transformers is the error due to inaccuracy.

A device for testing multi-pole angle sensors, comprising a reference multi-pole sensor connected to a gearbox, a bipolar rotating transformer, an amplifier connected to an actuating motor, a recording unit connected to a synchronous motor and a drive, characterized in that He introduced a bipolar phase shifter, synchronous detectors and an auxiliary multipolar sensor, the rotor of which is rigidly connected to the rotor of the reference multipolar sensor and kine cally coupled with its stator, which via a first synchronous detector connected to the first input of the second synchronous detector, a multipolar stator auxiliary sensor via series connected third and two-pole synchronous detector phase shifter connected to the second input of the second synchronous detector, the output of which is coupled to the amplifier; the bipolar phase shifter is kinematically connected with the bipolar rotary transformer and the executive motor, the bipolar rotary transformer is connected to the recording reproduction of the sine and cosine laws, which is spatial in nature (i.e. it is associated with the functional angle of rotation of the rotor). In the proposed device, the rotors 3 and 5 of the auxiliary and reference sensors are not associated with the functional rotation, but are driven by the drive motor into the auxiliary rotation. Due to this, the discrepancy from the inaccuracy of the reproduction of the sinus and cosine laws is of a temporary nature, i.e. it is expressed in the form of high harmonics of the output voltage form. Synchronous detectors 11 and 12 perform the function of filtering these harmonics. In addition to this, additional filtering is provided by damping the executive engine 16. The errors introduced by the masks 13 and 18 are small, since they are reduced by a number of times equal to the coefficient of electrical reduction of the sensor being tested, i.e. p times. For example, when the transformer 18 has an error of 2, the device has an error when the number of pole pairs of the sensor being tested is p 128

unit through the fourth detector, the high-frequency voltage source is connected to the auxiliary and reference rotors

multi-pole sensors and to the second inlets of the first and third synchronous detectors.

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