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Inverters and Drives from TDK - Hero Banner

Inverters & Drives from TDK

Mixed Media - Thermal Management

Thermal management

In a drive, the heatsink’s role is to cool the semiconductors and DC link capacitors and prevent overheating. Where no other temperature measurement is possible (i.e. wafer NTC inside the semiconductor module), the temperature of the semiconductors must be determined by means of the heatsink temperature. NTC thermistors are an effective temperature sensor to accurately measure the temperature of the heatsink.

NTCs - Table

NTCs

Product Type	Series	Technical Data	Datasheet	Features Overview
NTC	K45 (B57045K)	Operating Temperature -55°C to +125°C Rated resistance at +25 °C: 1 … 150 kΩ UL approval on request	Download	Temperature range -10°C to +125°C Thermal response time in air stream approx. 75 s Insulation voltage Vins >2500 V AC / 1s Good thermal coupling through screw-in case (M3 thread) Fast & simple screw-in installation (eg. On chassis) Customisable sensor design (eg. RT curve)
NTC	M703 (B57703M)	Operating Temperature -55°C to +125°C Rated resistance at +25 °C: 5 … 30 kΩ UL approved versions available	Download	NTC thermistor encapsulated in metal tag case with cable outlet Temperature range : -M703 -20°C to +125°C Temperature range : -M1703 -10°C to +260°C (sensor head) Insulation voltage Vins > 1000 V AC/1s
NTC	M1703 (B57703M1)	Operating Temperature -10°C to +300°C Rated resistance at +25 °C: 100 kΩ UL approved versions available	Download	Good thermal coupling through metal tag Fast and simle screw-on instalation Customised sensor design (eg. Cable length, RT curve, temperature range, Ring tongue design & connecotrs)
NTC	B57860S	Operating Temperature -40°C to +150°C Resistance Accuracy ±3% at nominal temperature Rated resistance at +25 °C: 5 … 85 kΩ UL approval on request		NTC chip connection usng standard semiconductor manufacturing processes NTC chip with termination on top and bottom side (silver or gold metallization) Resistance accuracy of ±3% at nominal temperature (eg. 100°C) Category temperature up to 150 °C

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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

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Right Rail Card Dark - Protection

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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Right Rail Card Dark - Input Filtering

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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Right Rail Card Dark - Rectification

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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Right Rail Card Dark - DC-Link

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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Right Rail Card Dark - Conversion

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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Right Rail Card Dark - Driver and Controller

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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Right Rail Card Dark - Output Filtering

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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