Field Or Armature Current Control TRIZ Cases

See how a cam-based speed control assembly uses magnetic coupling and Hall-effect sensing to ac

See how a control circuit adjusts PWM duty cycle based on real-time DC voltage detection to mai

See how a cam-lever-magnet assembly with Hall-effect sensing translates mechanical movement int

See how low-pass filtering of a single-point vacuum switch signal mimics analog sensor behavior

Voltage-based mode classification lets one battery-pack input control discharge current across operating modes with simpler circuitry and lower cost.

An arc-shaped shaft contact and PWM soft start cut friction loss and keep motor starting current within USB power limits.

A virtual neutral reference and timed PWM sampling detect Back-EMF zero crossings without filters, improving BLDC commutation accuracy.

A rotating passive wiper uses position sensing and fluid nozzles to keep sensor domes clear of dust and debris for reliable autonomous sensing.

Sampling each rectified voltage half-wave to generate a matched torque half-wave cuts torque ripple and control errors under distorted AC input.

Operating an eccentric motor at 10-40 Hz cuts perceived noise while preserving vibration output for more discreet stimulation.

Brush voltage drop is used to cap motor voltage under supply current and available voltage limits while preserving torque and reducing control burden.

Induced current integration improves brushed DC motor rotation estimation at startup and low speed, helping prevent anti-pinch control errors.

A shared half-bridge layout drives multiple vehicle door latch motors independently while cutting wiring, control units, and system cost.

Noise-shaped control alternates between forbidden-region boundaries to cut DC error and ripple in converter and motor-drive modulation.

Programmable control of isolated motor drive power rails adjusts voltage and EMI spectrum to support EMC compliance without hardware changes.

Adaptive PWM and feedback compensation keep multiple vehicle screens lifting in sync despite motor and load differences.

Direct limit-switch feedback cuts motor power without relays or software delay, reducing sparks and EMI in medical device motion control.

Encoding multiple BLDC control signals onto one wire cuts pin count and PCB area while preserving controller-to-pre-driver communication.

Feedforward and position-dependent torque compensation improves brushed DC motor speed control under high load and friction, reducing noise and vibration.

Dual speed parameters from detector signals and frequency analysis let small appliances hold DC motor speed under changing loads without extra sensors.

Motor shutdown reason is used to confirm whether a hand-held power tool completed its target task, giving users immediate operation feedback.

Programmable motor torque replaces bulky weights, delivering precise cable resistance profiles with low inertial mass across the full exercise stroke.

Current multiplication lets a small capacitor mimic larger gate-drain capacitance, regulating transistor slew rate while reducing motor stress and SoC area.

Preset PWM frequency bands let one controller run fans in different working areas, improving thermal stability while cutting noise and power use.

Limit-switch feedback lets the drive circuit cut motor power directly, avoiding relay sparks, EMI, delay, and motor burnout.

Four flat voice coil motors built into the VR head strap assist head turning from display cues, improving immersion without bulky add-ons.

PWM switching during DC motor start-up cuts peak current, reducing component stress, cost, and long-term burn risk.

Periodic PWM switching limits DC motor start-up current peaks, reducing component stress, burn risk, and electronics cost.

Direct displacement-sensor feedback bypasses controller lag, improving motor positioning accuracy while limiting interference and rapid drive defects.

Staggered PWM edges prevent simultaneous high-side MOSFET switching, cutting charge pump current and capacitor size in stepper motor control.

Motor current feedback adjusts stapler firing force in real time to keep staple formation and tissue cutting consistent across tissue conditions.

Boosted voltage and stored charge drive a rotary actuator directly, cutting flywheel-spring complexity, weight, and bulk in electric nail guns.

Motor shutdown reasons drive visual target-achievement feedback, helping users confirm screw completion and correct mode execution.

A rotating dome wiper uses Hall sensing and timed fluid spray to clear dust and debris, preserving autonomous vehicle sensor accuracy.

A dual-coil watch motor detects induced voltage in one coil while short-circuiting the other to suppress shock-driven rotor steps and save battery power.

Mechanical appendages and crisscrossed electrodes switch motor polarity and speed without software or internet exposure, reducing hacking risk.

A prescaler-based PWM circuit shifts frequency division from software to hardware, cutting CPU load while keeping motor speed control adjustable.

Dual-parameter back-EMF analysis enables coarse and fine DC motor voltage control, keeping shavers and toothbrushes stable under load.

Frequency-domain analysis of motor detector signals improves DC motor speed control under varying loads without extra sensors.

A secondary microelectronics override sets helicopter blade actuators to a default length, limiting maladjustment risk and stabilizing vibration.

An integrated rectifier, voltage sensing, and switching stage lets one switch drive motor handle AC or DC inputs with less wiring complexity.

Switching the fundamental period of pulse width modulation pulses minimizes electromagnetic compatibility noise in radio bands.

A fan detection chip uses current sensing modules to differentiate between DC and PWM fans without mechanical tachometers.