METHOD OF THREE-LEVEL SUPPRESSION OF PULSATIONS OF TORQUE MOMENT IN THREE-PHASE AC REACTION MOTOR Russian patent published in 2018 - IPC H02P6/10 H02P25/08 H02P25/86 

FIELD: electricity.

SUBSTANCE: method of three-level suppression of pulsations of torque moment in a three-phase AC reaction motor is proposed. The first set of threshold values (th1_low, th1_zero, and th1_up) of the torque moment is set in the interval [0°, θ_r/3] of the rotor positions. The second set of threshold values (th2_low, th2_zero, and th2_up) of the torque moment is set in the interval [θ_r/3, θ_r/2] of the rotor positions. Power is fed to adjacent phases A and phase B for excitation. The power signal, supplied for excitation to phase A, is ahead of the power signal, supplied for excitation to phase B, by θ_r/3. The entire switching process from phase A to phase B is divided into two intervals. In the interval [0°, θ₁] of the rotor positions, phase A uses the second set of threshold values (th2_low, th2_zero, and th2_up) of torque moment, while phase B uses the first set of threshold values (th1_low, th1_zero, th1_up) of torque moment. Critical position θ₁ automatically occurs during the switching process, thereby eliminating the need for additional computations. The total torque moment is controlled in the interval [T_e+ th2_low, T_e+ th2_up]. In the interval [θ₁, θ_r/3] of the rotor positions, phase A continues to use the second set of threshold values (th2_low, th2_zero, and th2_up) of torque moment, phase B continues to use the first set of threshold values (th1_low, th1_zero, and th1_up) of torque moment, and the total torque moment is controlled in the interval [T_e+ th1_low, T_e+ th1_up]. This suppresses the torque moment pulsations of the three-phase AC reaction motor and provides a high value for technical applications.

EFFECT: expansion of the range of suppression of the torque moment pulsations of the AC reaction motor.

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