WEG Australia has released upgraded versions of its CFW09 and CFW11 variable speed drives, which include Optimal Flux Technology to remove cooling issues in motors.
Optimal Flux Technology can eliminates the need for forced cooling in motors with speeds as low as 5Hz, even for constant torque loads with full motor torque demand.
According to the company, this means the variable speed drives can be used with the full range of W21 or W22 series motors.
WEG says the technology can provide cost and energy savings by removing the need for a cooling fan and the power and control systems needed to run it.
Motor longevity is also extended by carefully regulating the time between pulses of the IGBTs, which therefore reduce the voltage impulses at motor terminals.
This combination of motor and drive can decrease motor temperature rise is by as much as 11%.
Since motor insulation life is doubled by every 10°C decrease in its operating temperature, the new technology can dramatically increase motor life.