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Motor Control

How to Tune fslipmax on ZombieVerter VCU

Maximum slip frequency (induction motors). Sets full-throttle torque.

Quick Reference

Param ID

33

Unit

Hz

Range

0.3 — 10

Default

3

🔍 See a sample config →

📖 What Does It Do?

Maximum slip frequency (induction motors). Sets full-throttle torque.

🎯 Recommended Values

Default value: 3

Valid range: 0.3 to 10

Tuning Strategy

Start with the default value and adjust in small increments. Monitor vehicle behavior after each change before making further adjustments.

💡 Tuning Tips

ONLY FOR INDUCTION MOTORS.

⚠️ **OVERHEATING WARNING:** fslipmax too high = massive inverter heating!

Example: SDU with fslipmax=3.5 vs 3.0 — inverter temp went from 57°C to 82°C in a single 0-60 run!

TYPICAL VALUES:

  • Default: 3.0
  • Tesla SDU: 3.0–6.0 (published: 2/6)
  • Tesla LDU: 3.06–3.7

    • TUNE ON A HILL: full throttle up a grade, adjust for best acceleration without overheating.

    INTERACTION: boost + fweak + fslipmax all increase current together.

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    🔗 Related Parameters

    Other parameters in the Motor Control category that work together with fslipmax:

    fmax

    Hz

    Maximum motor frequency. RPM = fmax × 60 / polepairs.

    boost

    dig

    Voltage at 0 RPM — controls starting torque. Higher = stronger launch.

    fweak

    Hz

    Field weakening start frequency. Above this, motor enters constant-power region.

    numimp

    ppr

    Speed sensor pulses per revolution.

    polepairs

    Motor pole pairs. CRITICAL — set this correctly for your motor.

    snsm

    enum

    Motor temperature sensor type. Must match your motor's actual sensor.

    fslipmin

    Hz

    Minimum slip frequency (induction motors). Sets creep torque.

    encmode

    enum

    Encoder/position sensor type. This is your motor's 'eyes' — it tells the inverter where the rotor is.

    dirchrpm

    rpm

    RPM below which direction change is allowed.

    udcnom

    V

    Nominal DC link voltage. 0 = auto-calculate from actual bus voltage.
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