AC Motor Control TRIZ Cases

A motor control circuit sets inflection points across a duty cycle range to calculate target rotational speeds for flexible speed curve generation.

Silicon carbide solid-state switches reduce switching losses and noise in elevator power output stages.

Voltage divider enables detection input monitoring of circuit breaker state, resolving AC half-wave misfires without increasing hardware complexity.

Synchronized parallel stator windings enable continuous motor condition monitoring using minimal current sensors.

Wiring member with insulative partition electrically connects semiconductor terminals while blocking line of sight between them.

Phase isolation relays disconnect failed inverters from motor windings, maintaining drive current loops for continuous operation.

A rotating electric machine system uses a selector switch to toggle between full-wave and half-wave drive processes for efficient power transfer.

A safety circuit switches inverter transistors to dissipate excess energy as heat during power failures.

Specific excitation patterns align the rotor to maximize torque, preventing rapid storage battery consumption during emergency elevator car movement.

Processor switches between two voltage distortion compensation methods based on modulation index to minimize dead-time effects and maintain efficiency.

Three-phase PWM modulation method modifies waveforms to control inverter switches and reduce common mode noise.

A modular motor controller integrates a shared cooling system and symmetric output couplings to reduce assembly weight.

A motor drive power supply switcher selects between two voltage levels to manage internal regulator input.

A power converter detects phase currents by switching detection timing between first-half and latter-half carrier periods.

A control unit manages voltage across a filter capacitor in a power conversion device using existing converter elements.

A motor drive apparatus segments power and control ground terminals to suppress surge voltage in parallel inverter modules.

A variable speed fan drive circuit balances main DC bus lines using a virtual ground node.

Integrating a detachable snubber circuit module inside the semiconductor housing reduces inductance and contact resistance, improving surge voltage suppression.

A segmented bridge circuit measures individual branch currents to enable precise phase current acquisition during commutation.

Segmented control and power modules resolve programming complexity while maintaining secure communication.

Motor driver circuit switches from regenerative braking to short-circuit braking at low speeds, ensuring reliable stopping within stipulated time.

Pre-magnetize the stator to reduce current peaks from 300 Aeff to 50 Aeff during transitions, minimizing oversized semiconductor requirements.

A solid state reversing AC motor starter converts 125VDC to three-phase AC using insulated gate bipolar transistors.

A pyrotechnic fuse isolates the battery while a discharge resistor removes stored energy from the high-voltage intermediate circuit.

Periodic switch operation enables accurate polarity and amplitude determination while minimizing electricity consumption in electric vehicle monitoring.

Multi-phase electric machine control applies minimum dwell time and substitute space vectors to reduce line-to-ground voltage loads.

Variable pause intervals between current pulses reduce peak reaction forces on operators, improving comfort without sacrificing fastening efficiency.

A conductive noise suppressor uses a coupling coil to induce current in a power line, altering impedance and reducing common mode noise.

A power conversion device adjusts DC bus voltage levels to reduce inverter losses and downsize components.

Intermittent inverter switching raises direct current voltage above induced levels, ensuring stable motor starting without external standby supplies.

A control system dynamically adjusts hysteresis band thresholds to maintain consistent average phase current in switched reluctance machines.

A controlling unit determines current ratios supplied to coil units based on cart positions and impedance characteristics.

A power conversion apparatus uses two capacitor groups with common change-over components to support multiple DC voltage modes.

Embedding substrate electrodes in a concave portion prevents current leakage and abnormal discharge caused by uncovered electrode ends.

Tandem p-n junction protection strips manage current density in narrow resistive layers, maintaining stability at high temperatures.

Harmonic flux controllers generate compensating voltage commands to reduce rotor magnet overheating during reduced channel operation.

Nitrogen segregation at the silicon carbide interface terminates dangling bonds, reducing distortion and improving carrier mobility.

Segmented power converters in a doubly fed induction machine system reduce bulkiness while maintaining full power handling capability.

Feedback circuits modulate output voltages to balance currents, reducing circulating currents without centralized control.

A turbocompressor drives its lubrication pump using regenerative electric power generated during compressor deceleration.

Applies preliminary anti-action to pre-compensate dead time effects, canceling waveform distortion through signal subtraction.

Injecting test pulses into idle phases allows a controller to calculate decoupled flux, eliminating mechanical sensors and offset errors at low speeds.

A PWM phase controller adjusts carrier signal phases to reduce current ripple in hybrid vehicle DC voltage smoothing capacitors.

Thyristor-based inverters reduce converter costs for low power turbogenerators while enabling non-synchronous operation.

Interlocked terminal patterns distribute current evenly, preventing concentration in specific pins and extending device lifespan.

A control method determines optimal closing time ranges based on voltage characteristics across a controlled switch to minimize stress.

An electrodynamic braking device short-circuits the armature and excites the field winding to achieve rapid motor stopping.

A sensorless control method aligns phase current with back electromotive force using a single shunt resistor and microcontroller.

Online torque sharing function compensates for flux linkage rate differences during commutation, reducing torque ripples and improving efficiency.