METHOD FOR REDUCING ELECTRIC MOTOR VIBRATIONS Russian patent published in 2004 - IPC

FIELD: power semiconductor engineering; speed control of induction and synchronous motors using voltage or current inverters.

SUBSTANCE: proposed method for reducing vibration of motor controlled by output voltage of three-phase voltage inverter includes supply of positive and negative half-wave trapezoidal control signals to inverter inputs. 30⁰ of half-wave fall on ascending line section of trapezium, 120⁰, on dc voltage section, and 30⁰, on descending line section. Pulse-width modulation is made on ascending and descending line sections. As a result, mean potential difference between phases at inverter output varies obeying law of trapezium with 60⁰ ascending part of line voltage , part of dc voltage, and descending part of line voltage thereby ensuring reduction of higher harmonics in motor supply voltage components, connection of low-pass filter at inverter output without critical rise of power current, and reduction of labor consumption for pre-calculations of motor vibration characteristics.

EFFECT: reduced vibration acceleration of motor.

1 cl, 5 dwg, 2 tbl