Passive components for inverters and drives from TDK
Commonly known as an AC drive, variable speed drive, variable frequency drive, inverter or converter, a drive is a controller that directly drives an electric motor by varying the frequency and voltage supplied to the motor, thereby increasing the efficiency of the system. A drive circuit is comprised of several common stages, each of which requires careful design to meet safety and efficiency goals. At each stage of a drive circuit, passive components perform a crucial role in filtering, protection and conversion.
Use this tool to view our range of EPCOS and TDK components for Inverters and Drives.
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Protection
Thermistors acting as inrush current limiters are a low cost solution to this problem whilst input varistors are used to provide surge protection against voltage spikes on the input.
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Input filtering
EMC input filter requirements include limitation of conducted and radiated emissions, immunity to transients and surges on the power lines, and immunity to levels of external electromagnetic radiation and electrostatic discharge.
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Rectification
Each AC input phase is rectified by 3 diodes (top diode in the positive direction and the low side diode of the other two phases) so that the peak of the negative half cycle appears positive.
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DC-Link
A DC-link capacitor is fitted at this point to provide a low impedance path for high frequency switching currents and to provide energy storage.
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Conversion
At the conversion stage of a variable frequency drive, the DC voltage is converted into an AC voltage at a given but variable voltage and frequency to drive the motor.
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Thermal management
In a drive, the heatsink’s role is to cool the semiconductors and DC link capacitors and prevent overheating.
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Driver and controller
The Control and Feedback stages analyse signals from the current sensors mounted at the motor output, measure the temperature of sensors and control the driver for the conversion semiconductors.
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Output filtering
The output stage of a drive takes a three-phase AC output with variable frequency and amplitude for fine speed and torque control and filters it to minimise EMI and provide reliable operation of the power converter and load.
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Inverters and drives brochure
Avnet Abacus offers a comprehensive portfolio of EPCOS and TDK branded products for state-of-the-art inverter and drive design