Electric Motor Control TRIZ Cases

A vehicle inverter warms the battery by dissipating energy in switching elements, avoiding motor torque, noise, and excess switch heating.

PWM duty-cycle control switches between brake and freewheeling modes to limit regenerative current and protect the battery during saw braking.

Controlled phase-energy dissipation before BLDC commutation prevents negative transient currents and stabilizes low-capacitance battery supply.

Varying rotor bar widths create position-dependent impedance, enabling precise sensorless rotor position detection without extra sensors or signal lines.

DC link voltage feedback corrects sensorless PMSM startup speed to avoid negative torque, overvoltage, and large DC link capacitance.

Switching between sine-wave and wide-angle trapezoidal drive cuts current use and magnetic noise while preserving brushless motor output.

A switchable two- and three-stage inverter with a solid double rotor cuts low-load losses and improves EV drive efficiency.

A low-speed startup phase warms impregnated fan bearings before full speed, reducing abnormal noise caused by lubricant contraction in cold conditions.

Segmented voltage-vector control cuts rotor eddy currents and temperature rise while preserving single-monitor rotor position sensing.

Adjacent-phase PWM pulse comparison detects inverter faults without high-speed ADC sampling, cutting processing power and current use.

Power factor deviations are accumulated over time to detect synchronous motor excitation faults and maintain energy-efficient operation.

A thermal digital twin uses operating-point data and self-tuning models to estimate machine temperatures without real-time power-loss inputs.

Sequence current analysis with FFT and Hilbert methods detects BLDC winding faults early and gauges severity before failure.

Instantaneous phase sensing and model-based magnitude calculation enable fast motor control and overcurrent protection under non-sinusoidal transients.

Selective stator winding sector activation adjusts electric machine output across vehicle variants while reducing manufacturing complexity.

A 20-cell battery pack, brushless motor, and controller deliver sustained 3000 W in a hand-held tool while managing heat, current, and pack size.

PWM-derived motor voltage replaces costly current sensors to detect pump motor idling accurately and help prevent pump wear.

Acceleration feedback adjusts frame-by-frame drive voltage to prevent vibrator wall collisions, reduce abnormal noise, and extend motor life.

A direct sensor is paired with motor-variable position estimation to avoid complex multi-chip redundancy and reduce common-mode fault risk.

High-frequency voltage injection plus a zero voltage vector pulse improves PMSM magnetic pole position detection speed and accuracy at low rotating speeds.

Virtual electrical and thermal models estimate internal component temperatures from operating data, avoiding hard-to-install sensors.

Dual grip sensing zones stop the motor when the grinder is released or dropped, improving safety across varying grip positions.

A primary sensor is paired with motor-drive-variable estimation to avoid costly multi-chip redundancy and reduce simultaneous failure risk.

Precomputed CFD response surfaces let a VFD infer coolant flow and transient temperatures from electrical measurements without direct sensors.

Adjustable current in a parallel backup driver prevents cross-current, enabling efficient fault takeover in electric motor control.

Current peak values from inverter switch control enable fault diagnosis under variable speed conditions and even when the motor cannot run.

When both steering control lanes fail, shorting each motor phase and isolating the power supply creates braking torque to prevent wheel drift.

Line current analysis detects rotor slot harmonics to estimate asynchronous machine speed without encoders or known rotor slot data.

Three coordinated switches reconfigure dual n-phase windings between series and parallel modes to cut switch count, weight, and failure points.

A shared communication path links encoder and sensor data to cut motor control wiring and traffic costs while preserving high-speed transmission.

Switch-controlled current measurements locate motor and cable ground faults even when multiple phases fail at nearby positions.

Lookup tables indexed by stator current angle reconstruct BLDC phase currents faster, enabling field-oriented control with fewer components.

Brush voltage drop is used to cap torque in brushed DC motors while respecting supply current and available voltage limits.