Electric Motor Control TRIZ Cases

Filtered rotor position estimation removes fundamental-frequency error components, cutting torque and power pulsations in sensorless rotating machine control.

Inductive position sensing lets a lock controller reverse on blockage, then apply boost current to reach the target state with less excess draw.

A battery and supercapacitor power path lets motorized shades handle motor surges while keeping battery current at a lower average level.

Separate filtered voltage sensing for each inverter offsets wire impedance differences, reducing noise-driven overvoltage detection errors.

Continuous voltage pulses derive phase inductance to detect BLDC rotor position accurately at zero and ultra-low speed without sensors.

Switches between magnetic flux and q-axis energy maps to estimate rotor magnet temperature accurately without added sensors or cost.

Piezo elements in the motor force flow enable automated inverter calibration from force and torque data, cutting torque ripple and energy loss.

Temperature-based voltage thresholds let the inverter detect DC disconnection quickly while avoiding false shutdowns and overvoltage damage.

Electromagnetic emission comparison reveals converter faults and remaining life without extra sensors, supporting reliable propulsion maintenance.

Dual controllers synchronize PWM timing across abc and xyz phases so a 6-phase motor can keep operating if one controller fails.

Precomputed angle-based lookup tables reconstruct missing BLDC phase currents for FOC while cutting processing time and external sensing parts.

Electronic pole reconfiguration lets an electric motor adjust speed and torque in real time while improving efficiency across varying loads.

Braking energy from one machine tool drive is split between a shared battery and resistor, then reused across other drives to cut waste and cost.

Sequential current-path switching detects winding shorts before startup and separates phase winding faults from inverter failures.

A multiplexer and comparator-based scaling path improves DC link voltage resolution while detecting overvoltage and undervoltage faults.

Dynamic amplifier gain boosts motor winding current sensing accuracy across wide load ranges without requiring higher ADC resolution.

Independent balancing currents in winding segments retrofit flux control to cut vibration, noise, and THD without rebuilding the machine.

By extending on-time only when low duty cycles miss sampling timing, this case improves direct current measurement without upsetting voltage control.

Continuous rotor flux monitoring triggers d-axis pulse remagnetization when flux drops, limiting demagnetization in lower-cost electric motors.

When cold oil raises drag and vibration, the power control unit is driven to generate heat and warm the oil through a water-oil exchanger.

Complementary PWM across opposite-phase machine windings cancels common-mode emissions, cutting shaft voltage, bearing currents, and EMI filter weight.

Processed wind turbine detection data is turned into abnormality alerts that trigger maintenance and parts delivery with less downtime.

Multiple swing, vibration, and oscillation modes help an electric toothbrush clean missed tooth areas more completely.

By estimating phase resistance at standstill during start-up, the controller cuts FOC computation while preserving efficient, low-noise motor speed control.

Gradual inverter current control heats a parked vehicle battery through motor windings while keeping torque below the brake holding limit.

Predictive switching from SMO to high-frequency injection maintains rotor position detection during stall and reduces torque ripple.

A secondary motor tracks standby rotation to cool dynamic brake resistors and prevent heat-driven reliability loss.

Series-connected AC-to-AC converter modules cut traction voltage stress, enabling lighter, smaller, and more fault-tolerant motor drives.

Excess regenerative current is diverted through a resistor while torque or speed is limited by current and resistor heat to avoid breakdown without longer deceleration.

A step-up converter keeps battery voltage above IC thresholds during high loads, preventing cordless tool shutdowns and component damage.

An out-of-phase counterweight, linkage, leaf spring, and foam bumper cut axial vibration transmission in a percussion tool and reduce operator fatigue.

A voltage-follower and gain-amplifier test sequence verifies redundant generator overvoltage trips without multiple regulation voltages.

Back-EMF phase voltage sensing lets an eVTOL motor controller detect rotor position and quickly resynchronize inverter commutation after shutdown.

Independently actuated bipod legs stabilize and steer long utility poles in wind, reducing worker strain and improving positioning precision.

A control gain estimator aligns motion and servo parameters across separate unit systems, reducing manual tuning and improving motor response.

Low-pass filtering and averaged current sampling improve motor inverter RMS current detection without relying on a high-speed ADC.

Separate harmonic current control for each winding set cuts torque ripple from stator and rotor deviations while limiting noise and vibration.

Redundant primary and backup actuator channels verify commands and average duty cycles to resist common-mode failures with less hardware.

Deceleration torque based on rotor speed and acceleration damps DC-excitation oscillation and shortens magnetic pole position detection.

An operation mode determination circuit checks tentative and communicated settings with error detection to prevent load control malfunctions.

A predicted current-vector trajectory guides electric machine short-circuiting to reach a safe state fast while limiting transient current and voltage.

Hall sensors read axial leakage flux from rotor magnets to track shaft angle without sense magnets, cutting motor length, weight, and cost.

Sequential current-path switching helps distinguish phase winding shorts from switching circuit faults, cutting misdiagnosis and repair time.

Isolation switches and diode freewheeling paths manage OSSC faults, cutting drag torque and sustaining useful inverter output.

Variable dead-time control in a current-compensated power converter cuts harmonic current and helps meet IEC61000-3-2 limits.

Separate fault detection on primary and secondary circuits plus a self-test path improve isolated drive-signal reliability in vehicles.

Separate pre-drivers for main and backup EPS control units prevent shared-driver faults and keep motor control stable during failures.

Independent current-limit calculation lets steer-by-wire controllers maintain torque and turning accuracy when temperature sensors disagree.

A semiconductor switch and Zener decay path interrupt exciter current quickly, enabling fast rotor demagnetization during emergency shutdown.

N-division rotor region search and a stator-current cost model speed sensorless permanent magnet motor position estimation with less computation.