Wide range 3-phase voltage generator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Miscellaneous electrical devices
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Traditional 3-phase voltage generators are usually designed to operate at one fixed frequency, which limits their practical application.
A relatively simple 3-phase sine wave oscillator can be built around a wide range RC sine voltage generator that produces output voltages with a phase shift of 90°.
(click to enlarge)
When connected to such a generator on DA1 ... DA3 microcircuits, an electronic analogue of a transformer. Scott on DA4, DA5 microcircuits, a 3-phase signal is formed at the output of the device. The generator is tuned in frequency in the range of 50...500 Hz. The operating frequency of the generator is determined by the expression
For the capacitor ratings indicated in the diagram, the generation frequency can be calculated from the approximate expression
where f is in hertz; R - in kiloohms.
The generator frequency can be smoothly tuned within a decade by adjusting the dual potentiometer R7-R9, and in steps by switching the frequency-setting capacitors C1, C2. Capacitor C0 is designed to facilitate starting the generator.
Switch SA1 to the input of the device can supply a signal from an external generator E1, however, to obtain the necessary phase shifts, it is necessary to adjust the potentiometers R7 ... R9.
Author: M. Shustov.
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