Electric Motor Control TRIZ Cases

A separate DC motor switch within a shared drive circuit simplifies switch management while independently controlling DC and multiphase machines.

Temperature-based control reduces motor cooling water flow while running the oil pump to protect gearbox oil temperature and limit friction.

Supply-side voltage detection helps distinguish MOSFET faults from ground faults, improving motor power diagnosis accuracy and reliability.

By adapting a predefined electrical command to reach stable speed, the drive estimates rotor magnetic flux for reliable synchronous motor control.

A thermal model predicts inverter current sensor temperature from switch heat and current, enabling power derating only when overheating is likely.

Average current sensing adjusts inverter PWM duty ratio to curb overload current in power tools, extending runtime and reducing heat.

Block commutation at low speed enables cleaner Back-EMF rotor position detection in electric machines while maintaining torque across the full speed range.

By detecting voltage differences across fully on low-side switches, this circuit protects motor current while avoiding resistor power loss.

Adaptive protection inside a VFD tracks load conditions and adjusts trip settings to protect motors across variable frequency and voltage ranges.

A shared switching unit cuts switch count, controller size, and cost while protecting individual heating elements in motor-heater control.

Distributed electronic units share sensor data across geared motors, simplifying automated drive control without a higher-level controller.

Phase change material beside stator coils stores transient heat, helping slotless motors handle peak loads without adding much weight.

A neutral-point filter grounded through a current detection resistor suppresses noise while protecting the motor circuit from overcurrent damage.

Computed MOSFET duty ratio and motor current reveal partial open, short, and low-current torque motor faults before hardware failure.

A segmented motor drive circuit preserves bidirectional rotation and detects switch short circuits from voltage information.

Phase current sensing and thermodynamic control detect winding imbalance faults early, cutting losses and slowing stator aging.

A preset startup delay keeps the pre-charge circuit from turning on during jump-start overvoltage, preventing false checks and circuit damage.

Free-rotation motor voltage and induced EMF guide inverter restart timing and phase matching to avoid inrush current after supply faults.

Dynamic speed thresholds tied to power source voltage narrow fail-safe operation, reducing overcharging risk and unnecessary brake torque.

Timed pre-start braking stops a coasting brushless motor so rotor position can be detected accurately, reducing restart delay in power tools.

By discarding PWM-commutation-corrupted current segments, the drive estimates AC motor state in real time without sensors or added signal injection.

Common-mode voltage clamping redistributes inverter switching losses to balance switch temperatures and extend power device life.

Periodic current-vector variation calibrates motor encoder offset from speed oscillations, maintaining constant torque without a precise machine model.

A disturbance observer and compensation current scheme reduces front and rear wheel motor interference while enabling higher controller bandwidth.

A single drive and common current sensor keep parallel synchronous motors power-balanced, avoiding voltage mismatch and excessive current.

Redundant switching units short motor windings and trigger an electromechanical brake with fault feedback for reliable stopping in mobile devices.

A layered corrosion barrier, coatings, and sealed connectors protect power converters from sulfur and chlorine gases that cause arcing and failure.

A field weakening current offsets neutral-point sensing angle errors in y-connected EC motors, improving commutation stability and preventing failure.

Compares absolute-angle diagnostic signals from different conversion timings to detect rotation sensing failures without AD synchronization.

3rd harmonic feedforward compensation cuts common-mode current in open-end winding motor drives, reducing loss, ripple, and motor damage.

Offset voltage is tuned to match positive and negative side heating peaks, balancing switching-device heat with lower calculation load.

PWM pulse widths are used to derive inverter output frequency and rotational speed, enabling fail-safe overspeed shutdown without extra sensors.

Slip-rate control switches an escalator motor between star and delta wiring to cut energy use with lower cost than passenger counting.

A single-pair Ethernet link with PoE powers an analytics module near the motor, reducing controller processing load and wiring.

Measured input temperatures replace Luenberger scaling in inverter thermal circuits, improving operating temperature estimates and coolant flow control.

Slip rate detection guides star-delta switching in an escalator three-phase motor, improving energy-saving control without passenger counting.

Predictive duty-cycle averaging and carrier selection smooth the shift from overmodulation to six-step PWM, reducing motor-drive transients.

Estimated DC current from PWM duty and two-phase AC sensing identifies failed current sensor phases without adding a DC current sensor.

Torque feedback is compared with baseline data to detect rotation-lift assembly wear early and prevent chamber downtime and substrate loss.

Independent protection circuits detect coil overcurrent in hardware, cutting VDE compliance evaluation time and cost while preserving redundancy.

Transient current analysis across three-phase windings locates the initial PMSM rotor position without sensors, helping prevent startup reversal.