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The role of capacitor resistance in three-phase motor drive.

Hardware design
11월 17, 2020 by Aleksandar 1047

The picture shows a phase in a motor drive. Are C4B and R5B absorbing spike voltages? The voltage is 60V. How is this type selected?

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Dominika 게시 날짜 November 17, 2020

Filtered high frequency interference

In addition, inside the MOS tube: there is a capacitor between GS

The capacitance value is calculated according to the signal frequency

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Mirna 게시 날짜 November 17, 2020

The capacitor is an absorbing capacitor, which needs to be selected according to the voltage spike generated by the parasitic inductance on the bus. The high-frequency non-inductive capacitor should be placed as close as possible to the MOSFET on the PCB.

That resistor seems to be the discharge resistor of the bus capacitor, the circuit is missing part.

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  • Race

    Race 게시 날짜 November 17, 2020

    How is the parasitic inductance on the bus produced?

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Stevan 게시 날짜 November 17, 2020

Capacitors are absorption capacitors, and resistors and capacitors need to be selected based on the voltage spikes generated by the parasitic inductance on Vbus.

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