SU1453363A1 - Method of setting-up an integrating a.c. drive with cascade-connected tachogenerators - Google Patents

Abstract

This invention relates to electrical engineering and can be used in instrumentation. The purpose of the invention is to reduce the complexity of the settings. The device comprises an engine 1 with windings 2, 3 of control and excitation, amplifier 4 with adder 5 and operative amplifier 6, driver unit 7, phasing unit 8, excitation source 9, voltmeter 10, tachogenerators 11-13, strobodisc 14, strobothometer 15. Setting It is produced in series with each tachogenerator 11-13, after which they are again switched on in a cascade manner. 3 il.

Description

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The invention relates to electrical engineering and can be used in instrumentation lags, flow meters, etc.

The purpose of the invention is to reduce the labor capacity settings.

FIG. 1 shows a diagram of an apparatus for implementing the method; in fig. 2 is a diagram of the tachogenerator $ in FIG. 3 is a diagram of the tachogenerator setting.

A device for realizing the method of setting up an integrating AC drive (FIG. 1) includes a motor-1 with windings 2 and 3 of control and excitation, an amplifier 4 with an adder 5 and an operational amplifier 6, a driver unit 7, a phasing unit 8, a source 9, a voltmeter 10, tachogenerators 11-13, strobodisk 14, strobothometer 15. Each tachogenerator 11-13 (FIG. 2) contains excitation windings 16 and 17, adder 18, amplifier 19, phase and scale compensating units 20 and 21, generator winding Ku 22.

The motor shaft 1 has a mechanical connection with tachogenerators 11-13 and strobodisc 14, the output of the master unit 7 is connected to one input of the adder 5 of the drive amplifier 4 via the phasing unit 8, the other input of the adder 5 is connected to the output of the first tachogenerator 11, the input of which It is connected to the output of the second tachogenerator 12, whose input is connected to the output of the third tachogenerator 13, whose input is connected to the excitation source 9, the output of the adder 5 of the amplifier 4 is connected to a voltmeter 10 and to the input of the operational amplifier 6, the output of which is connected n to the control winding 2 of the engine 1, the excitation winding 3 is connected to a drive source 9.

Compensation of the in-phase and quadrature components of each tachogenerator, phasing and scaling the input signal of the drive is practically impossible, which leads to large errors. To eliminate this drawback, you can select from the cascade circuit (Fig. 1 one tachogenerator and perform high-precision compensation in phase and quadrature). its residual voltage component is similar to setting up a linear actuator. Then adjust other tachogenerators in the same way.

The proposed method is implemented as follows.

The input and output of one of the tachogenerators, for example, the tachogenerator 13 (Fig. 3), are connected respectively to the excitation source 9 and to the other input of the adder 5 of the drive amplifier 4. In this case, the tachogenerators 11 and 12 are disabled. Using the master unit 7 and the strobachometer 15, the exact rotational speed is set at 80% of the maximum value, and with the phasing unit 8 the minimum voltage is set at the output of the adder 5. Next, alternately adjusting the phase and master units 7 and 8, the settings are achieved exact value of maturity and minimum stress level. Then, using the driver unit 7, the direction of rotation of the engine 1 is reversed, bringing its speed to the specified value in the forward direction of rotation. Using the large-scale compensating unit 21 (Fig. 2), the arising speed error measured by the strobotometer 15 is halved without changing the sign. Using the phase compensating unit 20, the differential voltage of the drive f measured by the voltmeter 4 is halved, not passing through the minimum, by alternating adjustment halving the error in speed and phase. If necessary, establish the initial direction of rotation and the listed operations are repeated. The adjustment is considered complete if, for both directions of rotation, the error in speed and phase (differential voltage) does not exceed the specified value

Similarly, the drive is tuned with other tachogenerators. Then, the tachogenerators 11-13 are turned on in a cascade scheme (Fig. 1) and the final phasing and scaling is performed with one direction of rotation.

Thus, the proposed method of setting up an integrating AC drive can be extended to a circuit with any number of

tachogenerators, which allows to expand the functionality of the integrating drive.

Claims (1)

Invention Formula The method of setting the integrating AC drive with cascade-connected tachogenerators, in which phasing and scaling of the output voltages of the tachogenerators are performed using master phasing and scaling blocks and compensating them for the scale and phase blocks, which in order to reduce the complexity of the settings, turn off tachogenerators from the cascade circuit, the input of the first tachogenerator is connected to the voltage source, the output to the feedback input of the drive, accelerates the drive to the set speed in the forward direction of rotation, measure the actual speed, eliminate the error by changing the output voltage of the master scaling unit, measuring the mismatch voltage and using the master phasing unit reduce it to a minimum, then reversing the drive and accelerate it to the same speed, using a compensating scale unit to reduce the speed error by half using a compensating phase block, the mismatch voltage is halved; the indicated operations in the forward and reverse directions of rotation of the drive are repeated until three uema precision drive configuration with a first tachometer generator for speed and phase, and then turns the first tacho generator and alternately connect the remaining m, ahogeneratory with vypolne- Niemi operations specified for the first tachogenerator, whereupon all tachogenerators comprise in cascade. FIG. 2 .3