METHOD OF AC AND DC MOTOR PULSE CONTROL Russian patent published in 2011 - IPC H02P7/29 H02P7/292 H02P27/04 

FIELD: electrical engineering.

SUBSTANCE: in compliance with this invention, preset width of hysteresis zone is recalculated. New width is calculated by multiplying two magnitudes. First magnitude is equal to half the control error pulsation total amplitude determined between two pulses of one of synchronised sequences as the difference between adjustment error at interval of connection to nonpositive polarity power supply. Second magnitude is equal to sum of two items. First item is quotient wherein numerator makes unity while denominator equals product of four, magnitudes of relative duration of motor connection to positive polarity power supply defined as relation of connection duration in one cycle of synchronisation of motor with said power supply to sync pulse intervals, difference unity and magnitude of relative duration of motor connection to positive polarity power supply. Second item equals product of integrator time constant, sync pulse spacing and one fourth. If relative duration of motor connection to positive polarity power supply does not equal zero or unity and new width of hysteresis zone does not exceed preset width, then new width is used to shape top and bottom levels of current limitation. New motor current magnitude is compared with new top and bottom levels of current limitation and aforesaid process is reiterated. Computation produces hysteresis zone width that allows eliminating static error of current adjustment and ensuring mean current flow in load equal to current setting in adjustment of AC and DC.

EFFECT: higher quality of adjustment and system reliability.

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