E+C August 2018

round up

POWER QUALITY, STANDBY + BACK-UP

Energy efficient motor keeps SA economy alive Reducing energy consumption is a reality for all industries in South Africa, and the WEG W22 IE3 premium efficiency electric motor can rightfully claim to be the most efficient motor that is turning industry in the country. Available from ZestWEG Group, theWEGW22 IE3 is available in models with a rated capacity up to 1,000 kW and has been engineered specifically to reduce energy consumption optimising on total cost of ownership in numerous applications. The WEG W22 IE3 product line was engineered using the latest generation com- putational tools such as structural (finite element method) and fluid flow analysis as well as electric design optimisation software. This resulted in a robust product that offers reduced energy consumption and thermal efficiency as well as a reduction in noise and vibration levels. Focus on the frame/housing The frame is a fundamental component in the design because, besides constituting the mechanical structure reference, it is the main conduit responsible for the heat dissipa- tion generated inside the electric motor. The frame is constructed of FC-200 cast iron and its design ensures high thermal exchange and high reliability where mechanical strength is essential. The terminal box is located at the front of the frame thereby in- creasing the heat dissipation area and providing a uniform air flow over the motor frame. Fan and fan cover Good ventilation is key to reducing the mechanical losses, particularly for two-pole mo- tors. Due to its high efficiency, an IE3 motor has inherently less demand for heating removal, so the ventilating system can be optimised to reduce mechanical losses and consequently acoustic noise. WEG’s design on the cooling system on these new mo- tors was conceived using the most advanced simulation software and fluid flow anal- ysis software, resulting in an innovative aerodynamic profile with reductions in both mechanical and acoustic noise. Terminal box Because the terminal box is the point of contact between the user and the motor, WEG first carried out a field survey amongst installation and maintenance experts to determine optimal design performance. This research resulted in a new terminal box concept that prioritises the interface with the user, providing easier access and han- dling of the power and accessory cables and ensuring more reliability and versatility in the motor installation. The new terminal box allows improved cable housing, ensuring larger contact areas between the cables and the motor terminals and allowing correct tightening torque. The diagonal cut design of the terminal box base and the terminal box cover enables easier access to the electrical connection and gives a better view of the interior of the terminal box during installation procedures. Using the same WEG exclusive BMC (polyester with 20% fibreglass) die-cast ter- minal blocks that are used for the terminal blocks of hazardous area motors ensures high electrical insulation resistance and durability. In addition, the accessory cable connections are made with quick coupling connectors. Enquiries:Tel. +27 (0) 11 723 6000 or email marketing@zestweg.com

Electricity + Control

AUGUST 2018

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