» D e si g n N o tes
than standard ac induction motors and drives. It’s also a quieter package than the existing dc motor. However, a challenge was presented by the physical footprint of the existing dc motor. “Dc motors tend to be long and thin,” explained Betts, “whereas ac motors tend to be shorter but bigger in diameter.” The SynRM can be up to two frame sizes smaller than a conventional induction motor which is a benefit in the direct replacements of dc motors.
Challenges of constant torque While SynRM is well tested on quadratic torque applications, like pumps, fans and
compressors, there are fewer constant torque references, such as extruders. Despite the shortage of constant torque references, Betts was confident in the solution. “At no time did we feel that we were taking a risk with this new technology,” he said. “It had been widely tested and we had every faith in the outcome. As such, we did not consider it to be a risk at all. We were able to meticulously
plan the changeover of the dc drives to SynRM so that the entire installation and commissioning was carried out in just five days.” DW ABB abb.com
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DESIGN WORLD
Design Notes 5-16_Vs3a.LL.MD.indd 34
May 2016
www.designworldonline.com
4/28/16 4:44 PM