Abstract:
PURPOSE: A random centered pulse width modulation method is provided to reduce switching noise of a power converting device by distributing discontinuous and intensive harmonic components of motor voltage into continuous components of wide band. CONSTITUTION: A random centered pulse width modulation method comprises a step(S10) of modulating a voltage command to two-phase vector components and obtaining a format of a pulse by arranging the vector components in terms of time; a step(S30) of center-aligning the two-phase pulse; a step(S50) of shifting the two-phase pulse in accordance with a random displacement; and a step(S60) of generating the random-displaced center-aligned two-phase pulse.
Abstract:
PURPOSE: A switching angle control method is provided to allow for a precise control and achieve improved response speed, while achieving improved torque and efficiency of a switched reluctance motor. CONSTITUTION: A switching angle control method comprises a first step of adjusting a turn-off angle corresponding to the pulses of the maximum torque by fixing a turn-on angle of a converter(12), sampling encoder pulse outputs generated from an encoder(18) of a switched reluctance motor(14) and comparing the stored pulses and the current pulses; and a second step of adjusting the turn-on angle by a predetermined deviation of angle in such a manner that the maximum speed is generated, by receiving a phase current value from the converter and comparing the maximum value of the stored phase current and the maximum value of the current phase current.
Abstract:
PURPOSE: A switching angle control method is provided to allow for a precise control and achieve improved response speed, while achieving improved torque and efficiency of a switched reluctance motor. CONSTITUTION: A switching angle control method comprises a first step of adjusting a turn-off angle corresponding to the pulses of the maximum torque by fixing a turn-on angle of a converter(12), sampling encoder pulse outputs generated from an encoder(18) of a switched reluctance motor(14) and comparing the stored pulses and the current pulses; and a second step of adjusting the turn-on angle by a predetermined deviation of angle in such a manner that the maximum speed is generated, by receiving a phase current value from the converter and comparing the maximum value of the stored phase current and the maximum value of the current phase current.