Why it may make more sense to replace than repair you old HV motor

30 August 2019 | Web Article Number: ME201915886

Engineering Supplies
Motors, Drives & Transmissions
Pumps, Valves, Pipes & Fittings

THANKS to advances in knowledge and design it’s now easier than ever for old high voltage (HV) motors to be replaced with new, improved HV machines within the customer’s existing footprint and operational configuration.

That’s according to David Spohr, Zest WEG Group’s newly appointed business development executive, who added that HV units can now often be manufactured smaller than the original machines.

While smaller in dimensions than the original older HV motors, these motors still deliver the required performance at even higher output and efficiencies.

Why it may make more sense to replace than repair you old HV motor

“We have the capability to design a replacement motor to match the footprint of the original unit. This means it is not necessary for the customer to modify mechanical infrastructure or electrical design to accommodate an upgraded motor,” Spohr said.

While smaller in dimensions than the original older HV motors, these motors still deliver the required performance at even higher output and efficiencies.

He noted that, with the design lifespan of electric motors ranging between 20 to 30 years, there are still many old units in operation around South Africa. Technological improvements in motor design and efficiency, however, present a compelling case for the replacement of old units rather than repeated repairs.

Spohr said the cost of a major motor overhaul could be up to 60% of the cost of replacement. The advanced technology of the new units, however, bring important benefits. Key among these are reliability and efficiency, which means improved operational performance and direct savings in energy consumption

“When motor failures occur, Zest WEG Group has the ability to conduct a detailed on-site analysis. Based on a root-cause analysis, we can provide a failure assessment which will enable the customer to make an informed decision.”

The assessment includes an energy consumption analysis conducted with specialised software. In the light of the machine’s application, Zest WEG Group recommends enhancements for greater control and efficiency. These include motor control options such as variable speed drives (VSD) for applications such as fans and pumps.

“There are also significant productivity benefits from a new, more reliable motor. Unplanned downtime can severely erode plant performance, reduce output and risk supply relationships with customers. All this needs to be considered in the decision to continue repairing old motors,” Spohr said.

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