DC Motor Speed/Torque Control TRIZ Cases

See how a vacuum cleaner uses stick length and movement speed sensors to dynamically adjust mot

See how a vacuum cleaner uses stick length and movement speed sensing to dynamically adjust mot

Motor voltage and current feedback hold strong suction early, then taper battery power smoothly to avoid sudden vacuum shutdown.

Back-EMF pulse filtering and counter correction enable accurate furniture motor positioning without costly sensors, even near end stops.

Sensor feedback and microcontroller speed averaging keep electric bed motors at target RPM under varying loads for smoother synchronized motion.

TRIAC firing angle sensing derives dishwasher water level, avoiding extra pressure sensors and unnecessary drain pump noise and power use.

A tapped-winding boost converter switches DC-link voltage to match motor load, cutting partial-load losses in variable-speed drives.

Motor voltage and current feedback hold strong suction early in battery discharge, then taper power to extend cleaning time.

By comparing roll speed with motor speed, the dispenser detects near-empty paper rolls without opening the housing.

When airflow drops below a set threshold, the controller bypasses the VFD and powers the blower directly to keep HVAC service running.

Using attractive and repulsive magnetic forces, this swing control approach maintains user-set amplitude with better motion control and power efficiency.

Dynamic d-axis current adjustment uses bus voltage, speed, torque, and OOV feedback to cut motor current and improve power factor.

Variable motor drive slopes open, hold, and close the ice duct door more smoothly, cutting dispenser noise and power use.

Motor-driven push members open selected refrigerator doors against magnetic sealing force, reducing user effort and enabling multi-door access.

An integrated PFC motor drive cuts mains noise and maintains blender torque and speed across varying input voltage and frequency.

Shorter initial nonconducting periods and higher startup PWM help a linear vibration motor cut rise time while sustaining responsive haptics.

An electrically powered rod feeds commands and power to moving carriers for smoother drape motion, less wear, lower noise, and cleaner wiring.

A motorized slide assembly opens a bottom freezer door without protruding handles while PTC power blocking prevents motor overheating.

A motorized rack-and-pinion slide assembly moves the freezer door and receiving box together, preserving storage volume and airtight sealing.

A motor-driven freezer drawer opens automatically to reduce bending effort, while standby power cutoff lowers energy use when closed.

A leveled drive current lets one wire carry both signals while correction constants improve motor current detection and air-conditioner speed control.

A two-stage arm and carrier release mechanism lowers hanging clothes 20-30 inches beyond 90 degrees without complex pulley layouts.

Multiple fan pressure settings let a computer cooling controller match airflow and speed to thermal load while reducing power use and port demand.

Real-time motor current sensing adjusts rack speed in a fabric treating chamber to prevent overload while maintaining treatment efficiency.

Power is allocated between the electric compressor and heater from air temperature differences to cut battery drain and preserve cabin comfort.

Switching BLDC motor conduction from 120° to 90° raises current pulse duty at low speed, improving Back-EMF rotor sensing and refrigerator power saving.

An integrated analyzing unit checks the motor, power supply, control unit, and switch inputs to isolate faulty furniture drive components.

A decoupling circuit detects fan controller failure and forces full fan speed to keep a data storage chassis cooled and avoid shutdown.

Processor-controlled dispensing gives a full towel first, then shorter follow-up lengths to cut waste without leaving users short.

Sensors and piston control adjust volume flow ratio and secondary evaporating temperature to improve economizer-cycle refrigeration efficiency.

A single-phase line break protector and current sensing disconnect all phases on overheating, phase loss, or reversed sequence.

Sets start-up current from inverter temperature and updates it from output signals to improve PM motor start reliability and prevent overcurrent.

Operation current monitoring reopens a blocked ice duct cover, restores full closure, reduces cold air leakage, and warns of repeated faults.

Back-EMF waveform periodicity reveals child or pet presence in a washer drum, triggering an alarm or door opening to prevent drowning.

Current and voltage averaging ratios detect grid voltage drops early, shutting off compressors before stalling, thermal overload, and peak demand rise.

An active filter cancels inverter switching harmonics in PMSM chiller drives, cutting rotor heating and reducing passive filter size.

Iterative torque-error correction estimates blower airflow without duct sensors, helping maintain stable flow under motor limit conditions.

Stored ECM profiles replace varied PSC motors in HVAC units, simplifying service while enabling mode-based fan speed control for efficiency and comfort.

An external motor and pinion drive automate refrigerator drawer movement while preserving insulation, storage space, and straight anti-wobble travel.

A removable cover and modular connectors replace resin bonding, cutting assembly time, waste, and full-unit replacement in car fan controllers.

A bypass path lets refrigerant motors run directly at normal speed, cutting variable drive power loss, heat, and reliability issues.

Supplemental motor current warms the actuator in cold conditions, cutting friction, power draw, and mechanical stress without added heaters.

Multiple speed-frequency signals detect washer load imbalance through the full spin cycle, reducing vibration and motor overload without extra sensors.

A motorized refrigerator drawer uses sensors and a control circuit to cut opening effort, ensure full closure, and detect obstructions.

Lowering inverter carrier frequency during compressor preheating cuts leakage current, avoids breaker trips, and protects oil-immersed motors.

A monitoring unit suspends automatic furniture closing for a set interval, keeping drawers or panels open when users need uninterrupted access.

Motor-driven roller carriages and PLC coordination automate seat row deployment while covering floor guides to keep the surface continuous.

Motor current feedback and lookup-table speed control keep ventilation airflow constant as static pressure changes in the duct system.

A series-linked damper, spring, and retraction unit slows drawer or door closure before spring loading to prevent lock rebound, noise, and stress.

Automatic flap type detection lets a furniture flap drive choose the right operating parameters and avoid manual setup errors.

Input shaping selected from lens-position uncertainty cuts small-motion seek time while preserving camera lens positioning precision.

When DC motor load rises during scanning, conveyance speed is reduced to avoid sudden unavailability and extend image reader operation.

Closed-loop inner and outer coil control replaces permanent magnets to keep voice coil motor force stable under heat and impact.

Precomputed compensation angles let the control unit correct DC motor cogging torque quickly for precise throttle position and air intake.

A frequency-converter drive adjusts AC motor speed during grid voltage dips to keep cable winches stable and avoid overcurrent faults.

Current sensing lets one control unit manage multiple vehicle flap actuators with less wiring and no built-in position sensors.

Drive voltage is adjusted to lens or aperture movement demand, cutting camera module power use during shooting without losing positioning capability.

A laterally offset magnet and resonant electromagnetic drive enable long scan range, stable frequency control, and lower vibration in optical scanning.

Current monitoring at sub-threshold motor voltage detects external hatch movement without back-EMF hardware, improving control of small or slow motion.

Segment accelerometers detect track angle so the controller can add gravity compensation and keep linear motor movers on target on ramps.

Motor back-EMF and current oscillations are used to track window position without sensors, enabling reliable anti-pinch reversal with lower hardware complexity.

A shunt resistor and op-amp circuit compensates parasitic resistance to detect steering assist current accurately and reduce torque vibration.

Segmented forward and reverse signal-line wiring helps coordinate multiple lens drives through via points with accurate positioning and fewer sync conflicts.

Hall-sensor feedback and magnet-disc tracking correct counter-rotation false steps, keeping RET antenna downtilt positioning accurate.

Vehicle load is inferred from speed, handwheel torque, and motor current to avoid a separate height sensor, saving space and cost.

A spacer-separated resistor film and multi-point contact layout stabilizes DC motor speed control while reducing wear, short circuits, and space use.

Excess braking energy in vehicle door drives is dissipated through motor winding resistance via injected AC, avoiding bulky braking resistors.

A calibrated power-based model predicts motor constant drift from self-heating, improving optical actuator positioning without temperature sensors.

When power is cut, a short-circuited motor generates electromagnetic damping to restrain surgical manipulator motion and prevent collisions.

A filter-shaped driving force adds anti-resonance at the mass-spring frequency to damp structural vibration with lower frame stress.

Calculating dead time, resistance, and inductance voltages improves MDPS DC motor speed estimation without a voltage measurement circuit.

A bidirectional converter with waveform shaping matches motor back-EMF, cutting current spikes, internal losses, and battery stress.

Position feedback and timed speed control keep multiple roller blinds moving in unison despite differences in tube size and covering thickness.

A dedicated backup capacitor keeps the motor drive control circuit powered through voltage dips and outages while the main circuit remains supported.

Voltage monitoring across the triac gates the motor drive only above threshold conditions, cutting wasted trigger power and avoiding unstable near-zero firing.

A torque sharing system balances mechanical loads across parallel generators using real-time sensor feedback and controller adjustments.