Description: The problem of improving the efficiency, speed, reduction of electromagnetic interference, mass and dimensions of ms for launching hydro turbine engines of helicopters is solved on the basis of achievements in electrical machine building wer electronics and digital control. In this regard, single-loop and two-loop systems for launching gas turbine engines fo C-free direct-current motors controlled by quasi-resonance pulsed zero-current . This allowed improving the dynamic and mass-dimensional characteristics of launch systems. In this paper, a system for launching a gas turbine engine which is controlled by the commutator of the brushless DC motor stvom digital block with a sinusoidal law of pulse width modulation. As a result, the amplitudes of the higher harmonics in the supply voltage of the electr motor are reduced and the quasi-resonant pulse converter is eliminated from the triggering system to regulate the voltage at th input of the switch, which improves the efficiency. and reduces electromagnetic interference. As a result of approximation of the output voltage of the commutator by the Walsh-Fourier series, its transfer function is obtained, which, in contrast to kno representations, takes into account the discreteness of regulation in the pulsed pulse-width modulation range. Recommendation are proposed that allow the system controller to be tuned to the final duration of the start-up process. The s the main and three additional counters, four memory devices, three multiplication devices, two generators, six "AND" elements (by the number of switch transistors), six drivers and a pulse driver. Synchronization nsor of the brushless DC motor.
Keywords: brushless DC motor, pulse width modulator, transfer function, digital controller, read-only memory, optimization
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