Advanced architecture enables servo-like control with ac drive

The "480 V, three-level inverter architecture" of the G7 drive solves high-performance speed, torque, and position-control applications. Increased speed and torque response is said to provide servo-like motor control; and a new open-loop control method produces true torque control without an encoder.

By Staff January 1, 2006

The “480 V, three-level inverter architecture” of the G7 drive solves high-performance speed, torque, and position-control applications. Increased speed and torque response is said to provide servo-like motor control; and a new open-loop control method produces true torque control without an encoder. Three-level power architecture reportedly limits detrimental voltage-switching effects of IGBT power-switching devices to 50% the dv/dt value of conventional PWM drives. G7 drive simplifies 480-V installation and provides enhanced system protection. This technology also solves major installation and reliability concerns in industrial plants, for example: long cable length between motor and drive; induced shaft bearing current; EMI/RFI radiation; common mode currents; audible noise; and surge voltages, according to Yaskawa. G7 drives come in a 0.5 to 500-hp power range. Drive programming is DriveWorksEZ—Yaskawa’s PC-based, object-oriented graphical-icon programming tool.

www.yaskawa.com

  • 3-level’ inverter architecture produces high-performance speed, torque, and position-control

  • Numerous network communication options

  • Manages detrimental voltage switching (dv/dt) effects of IGBT power-switching devices