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Motor Control

How to Tune fslipmin on ZombieVerter VCU

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

Quick Reference

Param ID

37

Unit

Hz

Range

0.3 — 10

Default

1

🔍 See a sample config →

📖 What Does It Do?

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

🎯 Recommended Values

Default value: 1

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. Not used for PMSM/FOC.

CALCULATION: fslipmin = rated_freq - (polepairs × rated_RPM / 60)

Example: 4-pole motor, 1450 RPM at 50Hz → 50 - (2×1450/60) = 1.66 Hz

TYPICAL VALUES:

  • Default: 1.0
  • Tesla SDU: 1.0–2.0
  • Tesla LDU: 0.84–1.37

    • TUNE: adjust in ±0.1 Hz steps until car takes off smoothly from stop.

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    🔗 Related Parameters

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

    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.

    fslipmax

    Hz

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

    snsm

    enum

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

    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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