Torque Ripple Control TRIZ Cases

See how a motor driving apparatus reduces harmonics using voltage detection and a harmonic redu

See how an HVAC actuator controller identifies cogging-torque stable positions and applies peri

See how fluctuating speed demand control stabilizes DC bus voltage in motors with varying mecha

See how fluctuating speed demand reduces power variations in motors coupled to mechanical loads

See how a motor controller uses pre-determined stable cogging-torque positions to maintain actu

See how selective motor activation resolves hunting and current pulsation in parallel-driven br

See how inverter control achieves zero current during minimum torque phases to switch motor win

See how parallel adaptive estimation units suppress high-frequency speed pulsations in sensorle

See how determining compressor counter-torque and compensating motor torque offset reduces vibr

See how phase compensation angles stored in tables reduce compressor speed ripple caused by non

See how harmonic torque compensation regulates compressor motor speed to cancel periodic load v

See how a segmented booster circuit with two independent switching elements and an intermediate

See how dynamic switching between continuous and discontinuous PWM modes reduces inverter heat

See how selective motor connection and dynamic switching timing resolve low-speed instability i

See how average deviation feedback corrects target d-axis current to suppress peak current puls

By varying advance and freewheel angles with speed, this control keeps electric machine power steady and avoids current spikes at high rpm.

Estimator convergence checking enables reliable open-loop to closed-loop transition and fault signaling in sensorless permanent magnet motors.

Current-based voltage compensation lets a BLDC ventilation unit maintain rated air flow while limiting power use to meet Energy Star requirements.

Adjusting advance and freewheel angles with speed keeps electric machine current smooth and power stable as back emf rises.

Automatic gain control on Hall rotor-position signals preserves S/N ratio while avoiding detection-resistor power loss in large motor drives.

Temperature-based switching between continuous and discontinuous PWM cuts inverter board heat in laundry motors while preserving control.

Sensorless mechanical-angle detection and load-torque compensation cut speed ripple during constant-speed air conditioner motor operation.

Pulsed torque control lets an electric machine alternate output levels to meet varying loads with higher energy conversion efficiency.

Boosting field winding excitation after a sudden torque command helps a rotary electric machine reach target torque faster.

d-q current correction with combined feedforward and feedback suppresses sixth-order motor noise across a wide speed range.

Rotor rectification and stator-driven current control maintain synchronicity, cut torque ripple, and avoid brushes and rare-earth magnets.

Rectified rotor windings and current-angle control maintain stator-rotor synchronicity while reducing torque ripple without brushes or rare-earth magnets.

By shifting inverter switching frequency away from disturbance ranges, this case cuts motor vibration and noise while preserving stable control.

Zero-crossing timing lets an AC brushless power tool start reliably with a small filter capacitor, reducing size and capacitor heat stress.

PWM phase shifting or amplitude modulation adds controlled torque ripple to improve rough-road traction while preserving selectable ride comfort.

Selecting PWM carrier orders of Fc=6n+3 cuts inverter-driven motor torque ripple without adding current estimation load or longer processing time.

A disturbance observer is tuned to the mechanical antiresonance point, cutting torque-ripple vibration while maintaining stable motor control.

Brake switches use motor back EMF to damp gust-driven aircraft control surface movement without continuous battery power draw.

A DC/DC stage regulates voltage upstream of the inverter, cutting high dv/dt, torque ripple, EMI, and winding stress in motor drives.

Phase-offset control keeps multiple linear generator cores 180 degrees apart to cut acoustic noise, frame stress, and exhaust interference.

A wide stator pole pitch and trapezoidal flux and current waveforms raise permanent magnet motor torque without sacrificing winding space.

Segmented inverter pulse patterns suppress LC resonance near the DC link while preserving torque accuracy, noise control, and efficiency.

Regression-based duty ratio control smooths battery-voltage changes to keep electric tool motor speed stable without abrupt transitions.

Raising inverter switching frequency to 20-100 kHz cuts current ripple and thermal losses in low-inductance outer rotor power tools.

Filtered speed signals and PD torque adjustment target specific motor vibration orders, reducing perceptible EV vibrations and control energy use.

A non-magnetic spacer and controlled sensor spacing limit magnetic leakage near the encoder, improving rotor angle detection and reducing torque ripple.

A switched freewheeling path with diode and conversion resistor speeds rotor demagnetization and dissipates exciter energy in emergencies.

Phase compensation smooths PWM mode switching in overmodulation and rectangular-wave regions to reduce switching shock and torque fluctuation.

By tuning current waveform frequency, phase, and amplitude, the drive controls motor torque to reduce fuel flow ripple and pressure variation.

When a transfer switching unit fails in Y-connection drive, the controller shifts to dual-inverter mode to avoid regenerative torque and sudden deceleration.

A mapped switching-frequency range balances torque smoothness, noise, and filter-capacitor loading to protect inverter-driven machines.

Periodic task resynchronization lets a reset microcomputer rejoin motor control quickly, preserving torque consistency after low-voltage recovery.

Amplitude-limited torque ripple compensation suppresses motor ripple near current limits while preserving average torque.

Angle-based damping control suppresses resonant vibration in magnetic gear embedded motors, improving high-frequency response without structural changes.

Pulsed torque control with quadratic or cubic ramping improves electric machine efficiency under varying loads while reducing NVH during mode transitions.

Pre-positioning the EV drive motor rotor with a stator magnetic field removes locked-rotor torque during boost charging and battery heating.

A feedforward voltage path with bandwidth filters cuts EPS rumble from noisy current signals while preserving steering response.

Switchable converter states block phase-current reversal when back EMF exceeds supply voltage, cutting losses and avoiding rectifiers or PFC.

Reconfigured healthy-phase currents suppress open-phase vibration in six-phase permanent magnet motors while preserving torque output.

Drive-current harmonics are identified and canceled with compensation signals and phase-shifted carriers to reduce motor torque ripple.

Integrated ferrite rail filtering and Hall-effect leakage sensing help a high-voltage converter control EMI and detect ground faults.

Square-wave timing starts when salient poles avoid tooth openings, cutting torque ripple, vibration, and noise in compact brushless wiper motors.

Phase correction shifts coil power timing toward an extreme power value, cutting wasteful consumption despite imprecise rotator position detection.

Dual-loop feedback uses encoder and spring signals to balance force accuracy and motor synchronization in compact high-torque systems.

Harmonic current is superimposed on field current to cancel motor harmonics, suppress vibration, and avoid unnecessary energy loss.

Step-profile trapezoidal current control keeps BLDC commutation on active switches, cutting diode loss and torque ripple.

Back-EMF is captured during PWM deadtime to enable accurate zero-cross detection, simpler motor control, and lower torque ripple and noise.

A harmonic controller combines control and adjustment variables to suppress oscillations and keep motors stable under cyclic power demand.

Lookup-table harmonic current injection cuts synchronous motor torque ripple while preserving efficiency and DC link voltage limits.

Back-EMF sensing during PWM off-periods avoids coil floating, cutting BLDC acoustic noise while preserving fast speed response.

Dual variable transfer-function filters suppress magnet motor speed and torque pulsation for stable, accurate, and efficient control.

A split detector layout around the motor cutout contactor preserves short-circuit and regenerative current detection in rail PMSM drives.

Torque ripple measured with motor phases electrically shorted enables fast PMSM compensation without per-motor numerical tuning.

Cross-correlated feedforward identifies load torque ripple phase and magnitude in PMAC motors to cut vibration and manual commissioning.

Averaging multiple encoder time intervals suppresses cogging-driven discharge timing errors and reduces printing unevenness.

Back-EMF zero crossings are measured during PWM dead-time to enable sinusoidal BLDC control with lower torque ripple, noise, and computation.

Dynamic feedback gain control maintains motor torque stability while limiting vibration compensation to suppress torsional noise.

Speed-dependent voltage reduction and flux weakening cut axial deviation and radial bearing stress while preserving motor drive capability.

PWM-controlled stator conductors modulate the magnetic field to send data to the rotor while preserving inductive energy transfer.

A control apparatus superimposes harmonic-frequency currents onto stator drive signals to counteract electromagnetic forces in synchronous rotary machines.

Neutral point switches shift energization timings during half-wave driving to reduce torque ripple and increase average torque across speed ranges.