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DC to AC Drive & Motor Conversion

DC to AC Drive & Motor Conversion

Is DC/AC music to your ears?
Many Companies using DC systems have saved thousands in energy costs, reduced running costs, reduced maintenance costs and increased flexibility through a DC to AC energy conversion.

Many processes historically used DC Motors and drives were fitted because they were the only way to accurately control motor speed. DC motors are simple to control and provided accurate and fast torque control along with high dynamic speed response.

However there are a number of drawbacks to using DC motors which include; reduced reliability due to the fact that brushes and commutators wear down and need regular servicing; a greater financial investment as DC motors can be costly to purchase along with the need for tachometers, encoders for speed and position feedback. While a DC drive produces an easily controlled torque from zero to base speed and beyond, the motor’s mechanics are more complex and require regular maintenance.

Why you may want to consider change? So what can you do to improve performance and reliability and reduce costs? 

Converting your DC Motor to AC has a huge number of advantages including reduced running costs and substantial energy savings.

The evolution of AC variable speed drive technology has been partly driven by the desire to emulate the performance of the DC drive, such as fast torque response and speed accuracy, while utilising the advantages offered by the standard AC motor. The main advantages of using AC Motors are their compact and simple, yet robust design, along with reduced maintenance requirements and lower running costs.

DTC the worlds leading AC motor control Model

The revolutionary DTC technology developed by ABB, field orientation is achieved without feedback using advanced motor theory to calculate the motor torque directly and without using modulation. The controlling variables are motor magnetising flux and motor torque .

With DTC there is no modulator and no requirement for a tachometer or position encoder to feed back the speed or position of the motor shaft.The dynamic speed and torque  accuracy of DTC drives will be 8 times better than any open loop AC drives and comparable to a DC drive that is using feedback. DTC produces the first “universal” drive with the capability to perform like either an AC or DC drive.

Who can help?
As your local Drives specialists, Sentridge Control can offer you a free Energy Consultation to show you just what you would be saving were you to install the latest AC Variable Speed Drive (VSD) and latest efficiency Motors technology to regulate the energy consumption of your processes.

Our Process – Your Solution
As a dynamic and experienced engineered solutions provider, Sentridge Control has developed a seamless process for conversion of existing DC equipment to the latest AC Motor and ABB AC Variable Speed technology.

It’s not just the lower capital costs of an AC system compared to a DC system that makes conversion attractive, there are other issues too. AC technology is more efficient than DC and through greater efficiency comes lower running costs and far less annual maintenance required. There’s no need for annual replacement of brushes, filters or oil, no Commutator or wear checks and no need to stock spares.

With AC variable speed control, you will only consume the energy that the process actually requires. Heat loss is dramatically reduced, motors and pumps are slowed to an electronically controlled speed and they are also soft started and stopped. There are good space and noise savings too and the efficiency of your process is generally increased.
Typically, converting from DC technology to AC will save your process 20-30% in energy consumption. The conversion not only changes the active motors to AC but also the controlling variable speed drives.

Quick Paybacks and the Government will help
Investment costs are virtually self-financing. The monies saved from the reduction in energy
consumption can in most cases result in payback times of less than 2 years. You may also be eligible for 100% enhanced capital allowance under the government scheme which could reduce payback times further. See
The cost of your whole project is covered by the ECA Scheme, Material Installation and commissioning. We can show you how

Contact us today or take a look at how we have helped companies like yours.

Free Energy Audit

Book your initial energy audit with us today so you can see the potential savings for yourself.