Torque Ripple Control TRIZ Cases

Multiple rotor-stator modules deliver high torque at low RPM for aircraft propulsion without fuel hazards, exhaust, or altitude-related loss.

Gradually raising resolver excitation voltage from a start level limits transient coil overcurrent and avoids oversized drivers.

Model predictive current control removes 5th and 7th harmonic effects in PMSMs, cutting torque ripple and avoiding complex PI tuning.

Zero-phase voltage matching across dual inverters suppresses common-mode current and reduces motor losses in open-end winding drives.

Corrected current values compensate phase shift in dead time setting, cutting conduction loss while preventing arm short circuits.

Intermittent torque delivery lets electric machines stay near efficient operating points under varying loads, extending EV range.

Filters EMB reducer gear ratios against motor ripple orders to avoid overlapping frequencies and improve NVH tuning early in design.

Coordinated phase offset, apex timing, and force control between linear generators reduces noise peaks, frame stress, and exhaust flow surges.

Shifting PWM pulse edges near modulation zero cross reduces voltage error, DC components, and current ripple in EV inverter control.

A dual-control power converter cuts compressor vibration while suppressing capacitor current ripple to prevent power supply harmonics.

An active vibration controller adds oscillating torque near resonance to suppress motor vibrations and widen usable speed range.

An active vibration controller adds oscillating torque near critical speed to suppress motor resonance and widen the usable operating range.

Smooth amplitude ramp-up and ramp-down in linear motor vibration waveforms reduce overdrive, startup noise, and unsteady vibration.

Separating base and correction current loops with lower AC-loop gain cuts torque ripple while suppressing overshoot and oscillation.