Synchronous Motors Starters TRIZ Cases

See how a sensorless motor controller applies pattern signals based on prior rotor stop positio

See how stepwise motor acceleration and d-axis current control prevent starting delays and DC l

See how stepwise acceleration and magnetic flux current control enable reliable sensorless moto

See how back-EMF estimation from voltage, current, and zero-crossing signals enables sensorless

See how preliminary speed increase before Y-to-delta coil switching prevents temporary shutdown

See how a filtered current detection unit and drive-signal stop mechanism protect heat pump mot

Real-time motor state detection during bootstrap capacitor charging enables smoother outdoor fan startup and fewer start failures.

Feedback control of firing angle uses Back-EMF phase shift to detect air-water pump operation, cutting noise, energy waste, and overheating.

Segmented low-resistance current sensing helps a DC ventilation motor hold constant airflow despite duct resistance and wind pressure changes.

Varying the winding freewheel angle with motor speed helps permanent-magnet motors avoid current spikes and hold power as back EMF rises.

Sequential winding excitation and freewheeling maintain constant power in a permanent-magnet motor despite rising back EMF at high speed.

Variable advance and freewheel angles let a single-phase PM machine sustain high-speed output despite rising back emf and rotor loss.

A delayed load check plus motor frequency variation helps the inverter avoid unstable sleep-wake cycling and cut energy use.

Direct-current rotor magnetization and induced stator current zero crossings reveal drum rotation after power failure without added sensors.

Back-EMF feedback adjusts TRIAC firing angle in a household discharge pump motor to detect air-water states, cut noise, and save energy.

A synchronized constant-torque acceleration transient measures washing machine drum inertia more accurately under unbalanced loads with lower computation.

Varying advance and freewheel angles helps an electric machine maintain smooth current, power, and efficiency as back emf rises and voltage falls.

Low-voltage control and an isolated DC-DC converter enable inverter fault diagnosis before high voltage is applied, reducing breakage risk.

A fixed position-sensor offset corrects phase excitation timing, compensating sensor misalignment to maintain electric machine power across speed ranges.

A bidirectional DC/DC converter stores capacitor energy for power-loss valve return, cutting spring wear, heat, and circuit complexity.

Sleep-mode control cuts voltage to the inverter control circuit during nonuse, reducing battery drain while preserving host ECU communication.

Gradual PWM duty control during fan motor phase switching smooths coil current, reducing regenerative noise and transistor-damaging voltage peaks.

Temperature-based startup current control helps synchronous motors start reliably in cold conditions while extending semiconductor element life.

Rotor position detection lets a VFD switch a synchronous motor to the grid at a chosen shaft angle, preserving machine timing and position.

Pulsating voltage injection and PLL tracking estimate BLDC rotor position at low speed and standstill without external sensors.

A floating BLDC stator phase detects manual vehicle flap movement without extra sensors, including slow motion and rotation direction.

A reverse pulse based on inverted Hall feedback helps a claw-pole motor rotor overcome counter-torque and start in the correct direction.

Voltage pulse sequencing identifies the IPMSM rotor step at standstill from current response, avoiding sensors, rotor motion, and startup delay.

Active short and current profiles stabilize rotor position during sensorless AC motor start, reducing oscillation and wrong-way rotation.

Uses turbomachine sensor data and Affinity Laws to identify motor pole pairs and configure variable speed drives without shaft sensors.

PWM-driven BLDC phases detect manual flap opening and closing through inductance changes, avoiding extra sensors and slow-speed Back-EMF limits.

Pre-charged RLC stages sustain contactor coil magnetization through brief voltage dips, keeping motor starters engaged without batteries.

Current-based duty cycle modulation helps a motor driver deliver start-up torque and hold target current even when common voltage is low.

A staged low-to-high motor speed ramp helps drilling tools limit sudden torque, maintain user grip, and shut off if startup stalls.

A configurable inverter-converter-inverter starts high-frequency AC motors from a lighter DC bus while matching frequency and reactive power.

Temperature-based control adjusts motor current and speed ramp gradient so power tools start faster without losing rotor followability.

Pre-start rotor phase detection adjusts the initial phase command to improve synchronous motor startup and low-speed phase assignment reliability.

Dynamic inverter phase-angle control during mode switching limits fault current duration and protects thyristors and armature windings.

Short-circuit braking and Back-EMF rotor angle detection stop high-speed counter-rotation, enabling stable outdoor fan startup without waiting for wind to drop.

A two-level hysteresis current controller helps BLDC compressors start under high load, delivering faster torque control while preventing overcurrent.

Early voltage doubler activation boosts DC voltage before the speed command rises, cutting motor acceleration time in metal processing equipment.

A configurable inverter-converter-inverter matches AC frequency, voltage, and phase to start high-speed motors efficiently and stably.

Temperature-based ramp and motor current control helps a power tool start faster while maintaining reliable motor tracking under varying loads.

A controller switches VFSG excitation from 3-phase start mode to single-phase generate mode to curb back EMF, avoid arcing, and drop the DC-link capacitor.

Current rise times from opposite-polarity pulses reveal rotor parking position, enabling sensorless forward restart during oscillation.

A speed-based correction to thyristor phase control improves DC reactor current responsiveness during low-speed intermittent commutation.

Holding the offset correction value at low PWM duty ratios improves inverter current sensing accuracy and helps reduce steering torque ripple.

Filtering, rectification, and gain processing detect false neutral voltage in static starters fast enough to trip before transformer saturation.

Field current and phase angle are adjusted with speed to extend thyristor commutation margin and prevent high-speed starter failures.

Rotating-current calibration identifies rotor angle sensor offset in synchronous machines without high static currents, reducing heat, time, and damage risk.

A single DC voltage controls both motor direction and speed, cutting PLC wiring and power-supply complexity in conveyance and cylinder drives.

PWM energization patterns and offset current calculation enable one-shunt startup current sensing without regenerative braking or rotor deceleration.

Bus voltage isolation detection enables AC-powered fans to drive DC motors with simpler speed control, lower power use, and lower cost.

d-q current correlation with integrated feedback speeds rotor alignment to a designated position while improving control accuracy and sync stability.

Fusing sensor readings with thermal estimates improves inverter-rectifier control across the full motor speed range and helps detect failures.

A tilting electromechanical bypass contact shifts steady current off the semiconductor switch, cutting heat stress and cooling needs.

Multi-angle encoder feedback calculates PMaSynRM magnetic pole offset accurately, cutting self-learning time and improving drive control.

A low-speed startup ramp helps users position the drill before full torque, with automatic shutoff if target speed is not reached.

Mutual inductance measurements locate Back-EMF zero crossings and commutation points, enabling higher BLDC startup torque without sensors.

A single DC supply drives motor direction and speed through two input terminals, cutting separate signal wiring and system complexity.

A motor controller switches techniques by load point and uses high-frequency injection to detect rotor position without external sensors.

A synchronous reluctance rotor stores braking energy as kinetic energy, cutting battery heat, cooling load, and I2R losses in hybrid powertrains.

Variable phase-delayed braking pulses let a brushless motor stop with lower inertia, reducing loose fasteners, hazards, and damage.

Phase correction keeps the flux linkage vector center stable during rectangular-wave switching, suppressing offset current and motor vibration.