Among the many pieces of equipment at your facility, electric motors likely make up the majority. They also use more energy than any other piece of equipment. Worldwide, electric motors use 45% of all electricity consumed. Up to 95% of a motor’s costs can be attributed to the energy it consumes over its lifetime, while only around 5% of a motor’s costs are typically attributed to its purchase, installation, and maintenance.
Energy efficiency should be a major consideration when rewinding or purchasing a new motor because the annual energy cost of running a motor is usually many times greater than its initial purchase price.Considerable variation exists between the performance of standard and energy-efficient motors. Improved design, materials, and manufacturing techniques enable energy-efficient motors to accomplish more work per unit of electricity consumed.
The High Efficiency relates to a class of motor efficiency, and it is the result of legislation by the European Union (EU), USA and other countries regarding the future mandatory use of premium-efficiency asynchronous squirrel cage induction type motors in defined equipment.
This is part of a concerted global effort to reduce energy consumption, CO2 emissions and the effect of industrial operations on the environment, so regulatory authorities in many countries have introduced, or are planning legislation, to encourage the manufacture and use of higher efficiency motors.
The aim is for IE3 for all motors by January 1st, 2017, (for motors from 0.75 to 375kW), with IE2 only in combination with a variable speed drive. Motors are categorized according to a new efficiency class in Europe for 50Hz as International Efficiency ratingas follows:
When most people think about high-efficiency motors, they think about the energy savings and cost reduction of having them in operation. Using energy-efficient motors reduce operating expenses but there are other benefits. As a result, an energy-efficient unit has a longer life than a standard unit.
They reduce emissions and operating costs for a wide range of machinery in domestic, commercial and industrial applications, including HVAC systems, pumps and fans.
Electric motors and the systems they drive are the single largest consumer of electricity worldwide, accounting for more than 40% of global electricity consumption. Motors are widely used in both commercial and industrial manufacturing processes, where they can account for up to 54% of total electricity use.
VSDs are used to reduce the energy consumption of motors in commercial applications across the globe, often improving equipment performance and reliability at the same time.VSDs are available for both single-phase and three-phase applications.
Motors lack the intelligence to address three key problems that lead to massive energy wastage, unnecessary carbon emissions and undue wear and tear:
VTD can be applied to fixed speed applications and will dynamically adjust the torque output to meet load requirement without altering the speed (see fig. 1). This leads to substantial savings and is ideal for applications like escalators and many others which run at no/low load for long periods of time. In the right applications, payback is typically under two years.
VSD provides a smooth, step-less acceleration (soft start) of your motors (see fig. 1). This dramatically reduces wear and tear on your system and helps you to avoid peak demand penalties. With a controlled start in place your motors can now be switched off without the fear of re-starting and VSD can be programmed to perform this function automatically.
VSD can be specified to intelligently adjust the speed of your motors to match their variable loading so your motors only consume the power they need. This is a vast improvement over traditional control methods such as throttling (see fig. 2). A mere 20% reduction in speed can lead to energy savings of up to 50%.
The key benefits with VSDs include:
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