Control electronics play a crucial role in modern electric motors and can make the difference between an energy-guzzling and a highly efficient drive system. In industry, around 60 per cent of electrical energy is used to power electric motors – a figure that weighs heavily in light of high electricity prices.
With more efficient motors and optimised operation, electricity consumption can often be reduced by 20 to 30 per cent. In the context of the Energy Strategy 2050 and the rising CO₂ levy, improving the energy efficiency of electric motors is not only an ecological imperative but also offers significant economic benefits.
Electric Motors in Switzerland: High Electricity Prices as Drivers of Innovation
Switzerland has some of the highest electricity prices in Europe, averaging 25–30 centimes per kWh. What may initially appear to be a disadvantage for electric motors is actually driving innovation in energy-efficient technologies. Companies are therefore particularly motivated to invest in efficient motor systems.
Climate targets are also increasing the pressure to act. Switzerland aims to become climate-neutral by 2050, and industry must do its part. The CO₂ levy, already at CHF 96 per tonne of CO₂, makes the use of energy-efficient motors an economic necessity.
For electric motors in the power range of 0.75 kW to 375 kW, standardised efficiency classes (IE1 to IE4) according to IEC norms already exist. This classification has significantly contributed to improved efficiency in larger electric motors.
The Overlooked Potential: Small Electric Motors
For smaller motors below the standardised performance classes, energy efficiency is still often overlooked. This is especially unfortunate, as there is often considerable potential for optimisation in precisely this segment. Many applications rely on keeping motor energy consumption low.
There is a strong need for longer battery life and reduced cooling surfaces in many motor-driven systems. In practice, however, this is often hindered by the use of oversized motors paired with generic control electronics that are not optimally matched.
The Decisive Role of Control Electronics in Electric Motors
Control electronics form the critical interface between electric motor and application. They determine how efficiently electrical energy is converted into mechanical work. A well-tuned control system can improve motor efficiency by 15 to 25 per cent – without any changes to the motor itself.
Modern motor control systems use various strategies to optimise efficiency. These include field-oriented control (FOC), advanced commutation techniques, and adaptive algorithms that adjust to the operating conditions. Such technologies enable motors to run continuously at their optimal operating point.
Implementing Energy-Efficient Electric Motors in Practice
Putting an efficiency-optimised motor solution into practice begins with correct sizing. Rather than oversizing the motor, its power should be closely aligned with actual demand.
The next step is selecting a suitable control unit, specifically optimised for the chosen motor and supporting modern efficiency algorithms. With today’s high electricity prices, investment in high-quality control electronics often pays for itself within just a few months.
Economic Efficiency of Energy-Efficient Motors
The economics of energy-efficient electric motors are especially attractive. With electricity costs at 25–30 centimes per kWh, such investments typically pay off much faster than in other countries. A good rule of thumb: if a motor operates more than 1,500 hours per year, energy-efficient upgrades usually pay for themselves within 18 months.
Conclusion: Electric Motors in Switzerland as a Competitive Advantage
Energy-efficient electric motors are more than just a contribution to environmental protection – they offer tangible economic benefits through lower operating costs and can also enhance product quality. In a high-cost energy market like Switzerland, improving motor efficiency is especially worthwhile.
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