Electronic Commutation Motor Control TRIZ Cases

Voltage and current sensing on existing motor cable lines enables regular resistance updates for more precise converter control.

A closed-loop d-axis current strategy keeps PMSM power factor constant despite motor parameter variation, reducing apparent power and improving efficiency.

Controllers limit and normalize inverter voltage commands across two DC supplies to reduce system mismatch in rotating machine control.

Cross-point detection of rectified current helps stop motor operation during three-phase phase loss, avoiding abnormal drive under high load.

Back-EMF from forced EPS motor rotation wakes the controller in ignition-off state, enabling reaction torque to prevent arbitrary steering.

Iron loss is estimated from primary frequency and q-axis current, improving motor control accuracy across changing operating states.

A modulated compensation current added to Id or Iq counters rotor resonance in axial flux machines, cutting noise and vibration.

Current signals are used to estimate motor temperature and resistance, enabling accurate copper loss calculation without added temperature sensors.

A voltage conversion circuit aligns unequal power-source voltages in a dual-motor controller to reduce torque ripple and NV issues.

Two signal injections plus DC parking resolve 180° rotor misalignment in salient-pole PM machines without two- or three-phase sensors.

Zero-vector PWM adaptation balances diode and transistor junction temperatures to cut thermal stress and NVH during EV motor stall.

By limiting the coaxial voltage command first, this case stabilizes d-q current control near the voltage limit and suppresses oscillation.

A central speed command and local nudge current control improve low-speed torque response, reduce speed error, and balance parallel drive currents.

Dynamic inductance mapping updates PMSM current control in operation, improving torque and speed estimation while avoiding power overestimation.

Restricting inverter modulation during weakened field control preserves two-phase current detection, improving torque accuracy and reducing vibration and noise.

Estimated master motor speed is fed to follower drives to stabilize low-speed load sharing without encoders, cutting cost and complexity.

Battery-powered cartridge automation combines motorized handling, thermal control, and optical detection to deliver rapid molecular results in remote settings.

Peak-voltage differential analysis estimates phase wavelength to switch AC motor phases accurately during abrupt load changes and prevent step-out.

Square-wave voltage excitation maps synchronous motor inductance across current points faster while reducing rotor vibration and current oscillation.

Dynamic conduction angle control helps BLDC power tools overcome back emf at startup and maintain operating speed with adaptive motor control.

A thermal model predicts inverter busbar temperature from switch heat and current, enabling precise power derating without direct sensing.

A flux-vector estimator plus non-zero d-axis current enables closed-loop sensorless synchronous motor start-up at low speed and high load.

Back-EMF rotor sensing and partial-phase winding control keep an electric machine running after phase faults while cutting weight and wiring.

Band-pass filters and a temporal symptom vector separate fault signatures from transient speed changes in electric motor rotation signals.

Partial-phase winding control keeps torque generation after phase faults while removing neutral wires and using Back-EMF for rotor position sensing.

Pre-charging a superconducting field coil to a preset ratio cuts WFSM startup delay and improves output responsiveness.

Magnet flux is estimated from stable current and rotating-frame voltage equations, avoiding current changes that reduce motor efficiency.

Stepwise d-axis current tuning finds the minimum feedback current for steady motor speed, cutting microprocessor load and power use.

Two-stage DC current injection magnetizes the induction motor core at standstill for faster, more accurate drive tuning without rotation.

Voltage measured during initial core demagnetization lets an induction motor drive estimate flux and tune parameters accurately at standstill.

Multiple terminal-voltage readings during core demagnetization estimate inductance, rotor time constant, and resistance without starting the motor.

Multiple terminal-voltage readings during core demagnetization let an induction motor drive be tuned at standstill without rotational tests.

A master converter shares slip angle estimates so follower converters keep field orientation aligned without high-bandwidth links.

Continuous sliding-current control improves motor response to load changes while reducing chattering, vibration, and noise.