In my article "the Stabilizer and "watchman" for vibration pump" ("Radio", 2002, No. 3, pp. 25, 26) were proposed device that supports the performance of vibratory water pump "Baby" close to the nominal when characteristic of rural power grids, a significant voltage deviations from 220 V. the Equivalent circuit of the pump with the stabilizer shown in Fig. 1. To apply such a stabilizer with other pumps, but for this you will need to calculate the new parameters of the elements stabilizing circuit LстСст.
Initial data for calculation - based active RH and reactive HN = 2πFLH (F=50 Hz) components of the resistance of the pump from the applied voltage UH. Active resistance RH characterizes the energy consumption for remagnetization of the magnetic circuit and moves the moving parts of the pump, for heating and wrapping the connecting wires. Reactance HN characterizes the energy stored in the magnetic field windings of the pump.
Knowing the voltage UH consumed by the pump current In the active power of the desired PH the values found by the formulas:
However, to measure the power required PH wattmeter is quite rare in Amateur radio practice device. The following proposed method can be defined the parameters of the equivalent circuit, with only a voltmeter and ammeter.
The test set is collected according to the scheme shown in Fig. 2. Resistance resistor R1 should be as close to the expected value of the modulus the impedance of the pump |Zн| and appropriate power. They can be, for example, the burner of the electric stove or heater of any electric heating device.
The pump under test is immersed in water, applied to it and the resistor R1 the voltage is adjustable by using the autotransformer T1. Measurements begin when the minimum allowable pump voltage. For example, it is 180 V.
Closing the switch S1 measure current pump lH. Further, by closing the switch S2, measure the total current I∑ consumed by the pump together with the resistor R1. Razumkov S1, but leaving S2 shorted, measure the current of the resistor lR1
separately. You can now open the switch S2, to calculate the power factor according to the formula
as components of the total resistance of the pump according to the formulas (1-3). Described the procedure was repeated at nominal (220) and maximum (e.g., 240 V) voltages.
Reactance stabilizing circuit included consistently with pump as well
To stabilize the performance of the pump when the power supply fluctuations U, the value of HC depends on the voltage at law
Here N - the current consumed by the pump at the rated voltage U0=220 V. Substituting into the formula found in the previous scape values, we find the minimum HC min and max HC max loop impedance when the voltage at the specified interval.
Reactance of the capacitor CST must meet the condition
Choose a capacitor with nominal capacitance closest to the value defined according to the formula
and recalculated specify the amount of HDL. The capacitor must withstand AC voltage, the effective value of which reaches
Getting to the calculation of the throttle Lст, find the maximum current a current through it
and the wire diameter of the winding
The cross section of the W-shaped steel yoke throttle Abiram from the condition
To determine the number of turns of the winding using the known method experimental evaluation of the characteristics of the magnetic circuit. Assembly wire section 1 ...1.5 mm2 wound on it a test coil of wnp=50...200 turns connected through an ammeter to the adjustable autotransformer and gradually increasing the voltage, remove the voltage-current characteristic similar to the one shown in Fig. 3.
On the vertical axis here pending EMF is calculated by the formula
where r is the resistance of the test winding is measured with an ohmmeter.
Defining schedule EMF saturation Enas, the number of winding turns of the inductor find according to the formula
Check the possibility of placing the winding in the window of the magnetic circuit of width b and the height of p. If the condition
not finished, will have to take the yoke is larger. For convenience settings stabilizer I recommend you to provide from the windings of the inductor are some of taps.
Author: B. Porography, Krasnoyarsk