Electric Motor Control TRIZ Cases

A control device detects low mains voltage and limits motor power to curb heating, cutting drive motor material use and installation space.

Variable freewheel angle control offsets rising back emf in permanent-magnet motors to sustain power and efficiency across speed changes.

Variable freewheel angle control compensates rising back EMF to keep single-phase permanent-magnet motors near-constant power and efficiency.

High-frequency AC heating warms dormant refrigerant through motor losses while reducing compressor bearing vibration, noise, and standby power.

A center-tapped inductor and wye capacitor bank shunt high-frequency common-mode currents while preserving power factor control in active VSDs.

Capacitor voltage and DC-link current monitoring help complete motor drive pre-charging safely while avoiding inrush current and false alarms.

Temperature-guided DPWM clamps the hottest inverter phase leg to cut switching losses, reduce thermal stress, and improve machine efficiency.

Recursive filters model expected motor current and Back-EMF to detect jams early without false shutdowns during dynamic operation.

A hybrid half-bridge pairs transistors with different short-circuit strength so motor drives can shut fault current off without damaging weaker switches.

A reverse voltage preventer cuts reverse overcurrent from sensor wire shorts, protecting vehicle electronics while limiting extra power use.

When cold startup loads raise motor demand, this control approach limits power by speed threshold to protect batteries and motors.

Intermittent pre-control warms viscous oil with motor waste heat, then switches a sensorless BLDC pump to induced-voltage control.

Rotor-speed detection switches the BLDC drive waveform to create electromagnetic braking, replacing mechanical brakes and wear.

Real-time voltage setpoints coordinate excitation and motor currents so a separately excited synchronous motor tracks changing torque with lower copper losses.

Selected gap magnetic flux density points cut model-learning load while preserving motor evaluation index estimation accuracy.

When cold startup load drags motor speed below a threshold, control parameters are adjusted to cap power and protect the battery and motor.

Current limiting is adjusted from multi-part heat effects, preventing overheat while preserving electric power steering assist force.

Voltage and current waveform analysis estimates static and dynamic motor eccentricity from apparent resistance, avoiding extra sensors.

Voltage and current waveform analysis estimates static and dynamic motor eccentricity accurately without bulky optical or vibration sensors.

Series-parallel Dahlander switching matches aircraft fuel pump speed to engine demand, cutting excess flow, recirculation, and heat load.

State-based short-circuit activation checks temperature, rotor position, and current to prevent transient current spikes and magnet damage.

Conductivity testing plus discharge-profile comparison detects failing inverter IGBTs in wellbore drives before hazardous failure.

Mid-pulse motor stopping reduces backlash and false sensor pulses, keeping memory power seat positions accurate after repeated use.

Motor temperature feedback lets the controller reduce power before shutdown, extending power tool operation while preventing overheating.

Common-mode current sensing detects and isolates faults in high-impedance grounded DC feeders when low fault current defeats traditional methods.

A feedback current limiter compares sensed motor current with filtered PWM to halt drive pulses before overcurrent damages space-based BLDC motors.

Combining lower-rated Class 2 outputs powers a movable barrier operator farther from outlets while maintaining compliance and fault monitoring.

Real-time current-vector optimization lets an externally excited synchronous motor meet torque demand with minimal losses under current and voltage limits.

Rapid polarity switching raises hysteresis and ohmic losses to warm hydraulic fluid, cut cold-start viscosity, and avoid complex rotor laminations.

By analyzing DC link voltage ripple when the exciter is inactive, this case detects SOPMG and rectifier diode faults without extra circuitry.

Closing multiple converter switches creates a low-impedance path that redirects aircraft fault current away from wiring shorts and fire-prone hotspots.

Dynamic load sharing between high- and low-pressure spool machines cuts fuel burn while staying within thermal limits during low-airflow operation.

Learning stop timing and deceleration control prevent erroneous sensor pulses, keeping memory power seat positions accurate after repeated use.

A two-trial learning routine stores candidate command changes and updates the control map with summary statistics to resist sensor noise and converge.

Integer-ratio carrier frequency and phase tuning between converter and inverter PWM cuts capacitor ripple current without larger smoothing capacitors.

Closing multiple converter switches redirects aircraft fault current through a low-impedance AC-DC path, reducing fire risk at wiring faults.

A dedicated safety pin directly controls the power switch for fail-safe shutdown without extra relay circuitry or added IC complexity.

Bus voltage feedback adjusts motor drive duty cycle to suppress capacitor-induced spikes and prevent burnout in power tools.

A pre-start controller sequences phase switching to detect residual flux and de-saturate the motor, limiting inrush current and thermal stress.

AC-coupled fault reporting across isolation barriers helps high-power gate drivers detect faults, support soft shutdown, and improve protection.

Motor current and speed feedback set drive time and stop unscrewing at low torque or set turns to prevent over-driving and damage.

A back-EMF protection circuit estimates semiconductor switch temperature from motor and switch constants, avoiding sensors and enabling safe redrive.

By shifting phase PWM switching times to avoid simultaneous terminal voltage changes, this case reduces shaft voltage, noise, and bearing corrosion.

Torque-triggered forward and alternating motor motion helps Ni-Ti endodontic instruments cut efficiently while reducing jamming, breakage, and debris.

A common voltage measurement point lets the control unit detect stuck-closed inverter safety switches in real time with less hardware.

Motor duty signals are integrated to estimate drone battery charge accurately without adding dedicated current sensors, weight, or cost.

A dual-state control circuit compares bus voltage with back EMF to raise power factor and suppress motor-side noise in brushless power tools.

Relay diodes and a backup third inverter keep multi-phase motor current control working after inverter failure while blocking ground-fault paths.

Flux-linkage observer feedback updates rotor position and speed in real time to improve brushless winch motor accuracy under load changes.

Predicted load and temperature simulation smooth thermal cycles in electronic components, reducing thermal fatigue and extending lifespan.

Interpolated frequency characteristics across changing load conditions help tune servo parameters faster while maintaining stable control near resonance.

A controller switches from six-phase to three-phase operation after a fault, preserving torque and reducing ripple in multi-phase machines.

Motor winding resistance is measured during reverse drive to estimate clutch actuator temperature without a dedicated sensor, cutting part cost.

Current-pulse motor control releases locked tools and prevents damage while adapting torque to battery charge for longer cordless operation.

Oppositely wound stator sets and coordinated dual inverters cut dv/dt, EMI, and stray-capacitance currents in EV motor drives.

Torque measurements at quadrant boundaries locate the zero-torque angle, calibrating rotor sensor offset for more precise motor position control.

Intermediate-node harmonic estimation lets a bi-directional converter cancel higher-order input harmonics without bulky separate filters.

Temperature-based capacitor switching keeps motor drive filtering effective in cold conditions, preventing capacity decay and unstable power tool operation.

Sensor-based correction of thermal resistance, heat generation, and capacity keeps rotating motor temperature estimation accurate as aging changes thermal behavior.

Independent power switches and buffered PWM paths prevent floating ground states, keeping inverter protection stable during relay switching.

A high-resolution counter refines low-resolution encoder counts to reduce torque vibration and improve slow-speed motor feedback.

High-frequency carrier injection tracks rotor position from magnetic alignment signatures, enabling full-range sensorless AC motor torque control.

Segmented impeller blade arms and wipers improve wet-snow discharge, extending throw distance while reducing power draw and stall risk.

Semiconductor switches short-circuit PM motor windings for elevator braking, replacing contactors to cut size, wear, and emergency risks.

Driving-force amplitude is tracked against pump speed to detect abnormalities more accurately while reducing false alarms across operating ranges.

One inverter controls multiple PM motors by calculating one motor current from shunt and sensor data, cutting sensor count, size, and cost.

Induced-voltage switching keeps a permanent magnet motor within a speed window during power loss, avoiding abrupt clutch closure.

Spectrum analysis of passive DC-link voltage or current detects resonance and retunes filters or motor control to suppress damaging oscillations.

Standstill DC resistance measurement estimates PMSM shorted turns accurately while avoiding model dependence, inverter nonlinearity, and extra hardware.

Load-based feedback reduces brushless motor current under AC power fluctuations to keep power tool output stable and efficient.

Selective pulse interruption and switchable resistors improve fan motor EMC while keeping rotor speed stable and reducing noise.

Offset half-bridge actuation with current-compensated chokes cuts ripple current and motor noise while preserving inverter efficiency and compactness.

Stress-cycle counts by temperature, voltage, or speed range enable cumulative degradation tracking and earlier maintenance planning.

Multiple phase-shifted magnetic sensors estimate mover position from signal crossings and subdivisions, avoiding dust-sensitive optical encoders.

Feedback-based harmonic torque and flux references cut wind turbine generator torque and voltage ripple without complex machine models.

Position-based power limits adjust actuator output by spindle nut location to prevent mechanical overload as lifting geometry changes.

A controller limits and restores maximum rotor speed in steps from temperature sensor feedback to prevent drive train overheating without shutdown.

Switching between open-loop and closed-loop motor control helps impact tools avoid stripped fasteners while maintaining fastening speed.

Current-based estimation tracks stopped and running coil temperature to prevent brushless motor overheating without a sensor.

A connectable electric motor and energy store boost generator output during surges while keeping the engine near nominal power for exhaust after-treatment.

Segmented power and signal periods let a motor controller charge a capacitor first, then receive programming data reliably when AC frequency is abnormal.

A PCB high-impedance trace and thermistor cutoff interrupt motor power during current surges, preventing overheating and motor damage.

A rotor-angle-aware current increment model improves PMSM high-speed prediction accuracy while reducing ripple and dead-time sensitivity.

Ramp-up load monitoring blocks unsafe VFD bypass transfer when motor loading is too low, preventing full-voltage shock and damage.

Combining demagnetization and short-circuit detection on one anomaly line cuts controller port use while protecting the inverter and motor.

Phase-specific gain filters correct inductance-driven current imbalance, improving sensorless magnetic pole position estimation.

A stepped conductive-layer layout improves heat flow from the semiconductor element while preserving terminal insulation in sealed power converters.

Patterned input voltage lets the controller estimate rotor position and stator resistance, cutting alignment time, noise, and torque ripple.

A braking chopper set away from LC resonant frequency stabilizes shared DC-link voltage and prevents oscillations in multi-inverter drive systems.

Back-EMF monitoring triggers winding short-circuit braking to stop compressor reverse rotation and prevent fault-induced voltage damage.

A parallel regenerative path lets coil current escape during low-duty PWM, limiting power supply voltage rise in three-phase DC motor drives.

A master control architecture coordinates heat engine and motor torque split while handling overspeed, overcurrent, and overtemperature protection.

A floating low-side supply uses a diode, current source, and capacitor to keep starter generator switches on during Back-EMF faults.

A notch filter in each motor controller suppresses DC bus oscillation from LC-inverter interference, improving servo feeder stability.

A low-impedance STO layout directs isolation-barrier fault energy into inverter switches first, forcing a safe motor state before STO loss.

Temperature-updated current constraints replace command maps to cut losses, maintain torque, and protect rotating machines from overheating.

Reducing torque, acceleration, and jerk at low speed helps sensorless synchronous motors avoid loss of synchronism and run more stably.

A motor drive device calculates viscous friction torque compensation using a smoothed speed command to stabilize feedback control near zero speed.

Controller samples current sensing signals during specific switching periods to detect H-bridge circuit abnormalities in motor driving devices.