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Frequency inverters are electronics devices that make the speed make the rotational speed of an AC motor controllable. Background: If electrical machines or AC motors are operated directly on the AC grid, they only have a fixed rotational speed available - depending on the number of poles and the frequency fed into the local power grid. However, if an application or production process requires a variable AC voltage, i.e. a controllable speed, frequency converters are used. frequency inverters are used. These can turn a constant AC voltage into an AC voltage that is variable in amplitude (level of output voltage) and frequency. variable AC voltage.
A frequency inverter is connected upstream of a motor in order to generate a variable AC voltage in line with demand. This means that it is no longer the power grid that generates the frequency and voltage level at which the motoring operation takes place, but the frequency inverter takes on this task and regulates the output frequency and output voltage.
The big advantage of the frequency inverter? You can use it to change the speed of a motor continuously from almost zero to the required nominal speed and obtain a significantly extended speed range. The torque of the motor remains unchanged. In this way, system operators always adapt their drive technology to the currently required conditions. A frequency inverter also enables the direction of rotation to be changed directly. A simple control command is all it takes to change the phase sequence. The downstream AC motor then rotates in the opposite direction.
A distinction is made between current-controlled and voltage-controlled inverters. These differ in function as follows:
Put simply, what happens in a voltage-controlled frequency inverter the following happens: A rectifier converts the AC voltage fed in via the mains into a DC voltage. A DC link circuit then takes on the task of smoothing and stabilising this DC voltage. The inverter on the motor side then generates an AC voltage. DC-AC inverter on the motor side generates an AC voltage with the output frequency required by the application. The required motor speed is then calculated from the resulting stress/frequency ratio. The specification or calculation of the required rotational speed is carried out by an integrated open-loop control systemwhich connects all modules with each other.
Frequency inverters can be found in a wide variety of industry sectors and applications. Whether in drives for pumps and fans, processing machines, conveyor and assembly belts, cranes or handling systems: Frequency inverters have become an integral part of industrial production. This is because an adapted or continuously adjustable rotational speed enables optimized production processes - with the additional advantage that drives with speed control for energy-saving operation energy-saving operation operation.
Our frequency inverters are available in different designs and with many optional functions, depending on your needs and requirements. It is also crucial whether a frequency inverter on the walla central and protected location in a control elementin a control cabinet or directly in the field, i.e. decentralised - i.e. decentralised. And depending on how simple or demanding the respective application is, simple frequency inverters are more likely to be used. single frequency inverters or so-called application inverters with a wide range of functions or servo multi-axis amplifiers are used.
SEW-EURODRIVE was the first company to develop decentralised technologycompany to develop the decentralised technique and frequency inverters and mechatronics technicians onto the market. They enable system operators to significantly reduce their installation costs and create many options for modular system design independent of control cabinets. Our portfolio in the field of inverter technology also includes Devices for regenerative power supplywhich can be combined with one or more frequency inverters and drive inverters. We also offer simple motor starters for integration into the gearmotor.
From the simple inverter to the standard inverter or the application inverter through to the modular servo inverter, we have a comprehensive programme of drive electronics for centralised installation in the control cabinet or control box:
Another and more cost-effective option, frequency inverters centrally is wall mounting. It is always used when the purchase of an expensive control cabinet is to be avoided. Our frequency invertersthat are suitable for this type of installation are designed with a degree of protection ranging from IP 54 to IP 66 (for dusty and damp ambient conditions).
Is the pure inverter function sufficient for your application? Or do you want to simply want to switch a motor on and off or change the direction of rotation of a motor from CCW to CW? SEW-EURODRIVE also has the right products for you in its programme:
We offer a comprehensive range of frequency inverters to position your drive electronics close to the motor or gearmotor: from simple inverters with parameterisable ramps for robust use in simple applications to standard inverters with extended control functions and freely programmable application inverters for complex system architectures. If you also want to implement multi-axis movements and systems with interlinked machine modules in a decentralised manner, servo multi-axis amplifiers are the first choice. Our portfolio includes decentralised inverters: