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Inverter Hardware

How to Tune pwmfrq on ZombieVerter VCU

PWM switching frequency. Higher = cleaner motor but more IGBT heating.

Quick Reference

Param ID

13

Unit

enum

Range

0 — 2

Default

1

Available Choices

0: 17.6kHz 1: 8.8kHz (default) 2: 4.4kHz
🔍 See a sample config →

📖 What Does It Do?

PWM switching frequency. Higher = cleaner motor but more IGBT heating.

🎯 Recommended Values

Default value: 1

Valid range: 0 to 2

💡 Tuning Tips

**FIRMWARE VALUES:** 0=17.6kHz, 1=8.8kHz (default), 2=4.4kHz

TRADEOFFS:

  • 17.6kHz — Lowest motor losses, silent operation, BUT highest IGBT heating. For high-performance builds with proper cooling.
  • 8.8kHz — Best balance for most builds. Default.
  • 4.4kHz — Lowest IGBT losses, good for thermally-limited builds, BUT audible motor whine and higher motor losses.

    • Common: Tesla SDU/LDU use 8.8kHz. Prius Gen2 often uses 4.4kHz. High-perf builds use 17.6kHz.

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    🔗 Related Parameters

    Other parameters in the Inverter Hardware category that work together with pwmfrq:

    deadtime

    dig

    IGBT dead time between high/low-side switching. CRITICAL safety param.

    ocurlim

    A

    Overcurrent limit. If RMS current × √2 exceeds this, inverter trips.

    il1gain

    dig/A

    Current sensor 1 gain. MUST be calibrated for accurate current measurement.

    il2gain

    dig/A

    Current sensor 2 gain. Same as il1gain but for second phase.

    udcgain

    dig/V

    DC bus voltage measurement gain.

    snshs

    enum

    Heatsink temperature sensor type.

    pwmpol

    enum

    PWM polarity. Depends on gate driver design.

    udcofs

    dig

    DC bus voltage measurement offset.

    pinswap

    enum

    Pin swap configuration. Swaps resolver sin/cos or other signals.
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