Torque Ripple Control TRIZ Cases

Tandem single-phase SRM slices with aligned stators and offset rotors improve material use, smooth torque, cut noise, and solve starting issues.

Differential torque feedback rebalances power between dual coil groups to limit torque ripple during overheating or torque restriction.

Bi-stable torque control and sinusoidal zero-velocity mapping enable gearless BLDC motors to achieve sub-degree pointing with lower torque ripple.

Interleaved series and parallel modulation cuts DC-link RMS ripple current, enabling smaller storage elements and simpler EMI filtering.

Adjusting PWM carrier frequency by torque command and motor speed shifts phase error to suppress PMSM vibration and noise across speeds.

Current ripple analysis in a brushed DC motor enables accurate shaft and mechanism position detection without external sensors, cutting complexity and power.

Voltage feedforward compensates spatial harmonics and phase lag to suppress motor torque ripple without sacrificing control responsiveness.

Zero-crossing timed PWM startup and a small capacitor filter cut DC bus pulsation, heat, and startup failure in AC brushless power tools.

Precomputed current and phase-angle tables stabilize synchronous reluctance motor torque despite inductance variation, improving efficiency.

Controller-driven current angle and magnitude adjustment keeps rotor motion synchronized while reducing torque ripple and rare-earth dependence.

Direct voltage-command correction from estimated flux and torque ripple suppresses high-frequency pulsation without amplifying motor noise and vibration.

Pre-characterized torque-position-current tables let a variable reluctance motor controller cut torque ripple and improve precision without complex commutation models.

Multiple feedback loops combine band-pass filtering, phase compensation, and gain adjustment to suppress shifting resonance modes with simpler control.

Model predictive current control suppresses 5th and 7th harmonic currents in PMSMs, reducing torque ripple while avoiding complex PI tuning.

Coil resistance and back-EMF feedback enable closed-loop OIS motor stabilization without position sensors, reducing resonance blur and module size.

Pre-switch rotating-frame voltage compensation stabilizes PWM mode transitions, reducing torque ripple and 3-phase imbalance.

Model predictive d-q voltage control counteracts magnetic cross coupling to improve torque tracking and reduce torque disturbances.

A notch-filtered angular velocity signal suppresses motor torque vibration while preserving responsiveness during sudden speed changes.

Independent bridge circuits for at least four motor coils keep torque delivery available after coil faults and improve vehicle drive reliability.

Stored regression equations set PWM duty from battery voltage, smoothing electric tool speed changes without abrupt lookup-table transitions.

Precomputed current-position-torque tables cut torque ripple in variable reluctance motors and improve precision without complex commutation models.

Splitting motor phase windings into drive and compensation sets suppresses EMI spikes while preserving high-speed electric drive control.

Back-EMF zero crossings are measured during PWM dead-time, cutting BLDC control load, torque ripple, and electrical noise.

Phase-shifted dual B6 bridge drivers split motor current to suppress ripple, cut EMC noise, and ease component loading in vehicle BLDC motors.

Multiple fixed current-sampling timings avoid switching-noise errors at high modulation, improving EPS motor smoothness and control.