Drives and Control Solutions

Motors, Control Solutions, Power Transmission and Advanced Motion Technology                                                                 

November 2, 2018

Maximizing Gearmotor Speed Range is SEW-EURODRIVE'S technical white paper that shows how to operate VFDs above 60Hz to widen gearmotor speed range, improve system stability, and reduce cost. In fact, operating VFDs as high as 120Hz may significantly enhance gearmotor performance.

Many engineers assume that the inverter and gearmotor must operate within the 60Hz threshold. Some think that going to a high speed above 60Hz may cause the motor to overheat. But in reality, stopping at 60Hz may actually cause the motor to overheat at a low speed.

With a carefully designed drive system and correct ratio, pushing the operating frequency above 60Hz is possible using one of two proven control methods - field weakening or supercharging. Both methods are discussed in detail, along with technical charts and formulas. Through a common conveying example, the paper demonstrates how to properly select a gearmotor that will significantly enhance performance in the following ways:

• Increase stability by reducing inertia mismatch

• Widen the available speed range

• Eliminate a costly ventilator fan at low speed

• Eliminate motor overheating at low speed

• Enable the use of a smaller motor

Visit www.sewwhitepapers.com/vfd to download the PDF.


Editor's Pick: Featured Article


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The variable frequency drive (VFD) cable business has become a very large market for cable manufactures in the last 20 years. In the past, standard AC motors had the complexity of a squirrel cage motor – just get power and it would run. The first silicon controlled rectifier (SCR) was developed by Bell Labs/GE in 1958 to vary the speed of DC electric motors used in various applications. Since then there have been motor speed control technology evolving from large-scale integration (LSI), gate turn-off thyristor (GTO), pulse-width modulation (PWM), insulated-gate bipolar transistor (IGBT), and space vector pulse-width modulation (SVPWM). These new forms of power conversion to support speed control in VFD motors has caused the demand on the cables to change as well, which has led to many new cable options.


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As the mining business adapts to changing technological trends in the market, Epiroc’s Canadian operations have introduced Regional Application Center (RAC) teams to assist in this new digital transformation.

Team of experts that supports digital transformation

Across the board, mining projects are continually pushing for increased production while prioritizing safety. With this in mind, Epiroc has assembled specialized automation and digitalization support systems in strategic locations across the globe to help improve customer processes and boost productivity. The result is a heightened level of production that keeps workers out of danger zones on site while providing enhanced strategic direction for customers. Interoperability improvements have reduced variability and allow project planners to move towards their targets with renewed confidence. 

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During Hannover Messe 2020, ABB had extended the scope of applications for ABB Smart Sensors with a new generation design for motors in hazardous areas. Chemical and oil and gas customers can now benefit from cost-efficient condition monitoring in a wide variety of applications.

The high-performance wireless smart sensor monitors key parameters to provide detailed insights into the performance and health of assets such as motors and pumps. Equipment installed in difficult or dangerous to access locations can be safely monitored from a distance. Combining connectivity and data analytics means operators can plan their maintenance activities in advance, reduce downtime and extend equipment lifetime.

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