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Why DC? It’s not dead yet

03 June 2019

Thirty years ago, as AC inverters improved their reliability, several well-known companies and big names in the automation business announced that DC was dead.

In some cases, selling prices were altered to make the DC drive product less competitive to try and promote the AC technology. With this being the case why is it that all these years later DC drives are still in demand and being used in production critical applications?

A lot of bad press has been given to DC drives and DC motors. Energy efficiency, maintenance and reliability have all been used to try and convert the customer over from DC to AC, yet it still survives.

So why? Well, automation applications require accurate variable control of both speed and current to match the application requirements and many of these applications require full torque capability at very low speeds and at zero speed. They need to be receptive to shock loads and to be able to compensate for these and recover with minimal effect on the motor performance and they need to be able keep accurate speed regardless of whether the motor is being driven or overhauled.

Read the full article in the June issue of DPA



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