Inverters driven to new paradigm
August 1st 2007

The new Hitachi SJ700 variable speed drive is an off-the-shelf unit with integral easy sequence programmable functionality (EzSQ) as standard.

It also incorporates a new patented power switching technology to reduce dVdT, with the IGBT (insulated gate bipolar transistor) stack at the heart of the drive, which is associated to motor insulation breakdown by the increased terminal voltage of motors when used with AC Inverters.

Stuart Harvey of Silverteam, Hitachi's Drives and Automation Company in the UK, says: "We can now look at multipoint positioning and near servo performance from a standard induction motor.

People have been promising this for about five years, but the SJ700 is the first to be able to offer such performance from standard equipment.".