Multiple Motor Speed/Torque Control TRIZ Cases

See how current-direction-based transistor switching reduces voltage errors and coupling when a

Stored stop current and speed let the controller match restart current to residual load, cutting peak current and start failures.

Integrated power electronics in each compressor, fan, pump, or valve cut redundant supply hardware and reduce EMI from long PWM lines.

A delayed FOC estimation stage identifies rotor speed and position before startup, enabling smooth sensorless PMSM restart during windmilling.

A single-board rectifier, capacitor, and power switch layout cuts tool volume, heat, and failure-prone inter-board connections.

Reverse fan rotation clears dust and hair from hair dryer inlet holes, reducing manual cleaning time and restoring airflow.

Real-time position feedback lets seat slide rail motors correct speed differences, improving synchronization accuracy, stability, and layout flexibility.

A molded terminal connector doubles as a cylindrical baffle to direct coolant around stator end windings, reducing overheating in vehicle motors.

Residual current sensing lets one inverter stabilize multiple sensorless EC motors, reducing sensors, computing load, and speed oscillations.

Reverse fan rotation blows dust and hair out through the inlet, cutting manual cleaning effort while maintaining hair dryer airflow.

A characteristic-function approach estimates PWM converter losses across similar motors by reusing reference motor data instead of repeated measurements.

Motor speed decoupling and torque compensation help a riding lawn mower hold direction and steer smoothly on slopes with less user correction.

A shared half-bridge frequency converter drives three-phase and single-phase motors with less circuitry, cutting space, cost, energy use, and heat.

Staggering excitation timing across multiple sensorless motors cuts power-supply ripple and voltage drop while keeping rotor detection fast.

Shared reference and position data let motor controllers coordinate multiple axes locally, easing host load while improving synchronization accuracy.

Automated identification of feed-forward parameters improves tracking precision, contour fidelity, and mechanical stress control in coupled axes.

Independent wheel-speed control and load compensation help a riding lawn mower hold direction on slopes without costly tire changes.

A single-board BLDC power tool layout cuts inter-board connections and uses heat sinks to reduce size, heat, and failure risk.

Hall sensor feedback adjusts motor duty ratios so two vehicle seats fold or unfold together despite motor and gear speed variation.

A multiplexed controller manages multiple variable-frequency motors through direct communication and signal prioritization.

An abnormality detection unit directly monitors axes to bypass coupling delays, enabling rapid safety operations that prevent tool damage.

Calculates magnet temperature via magnetic flux derived from phase voltage and rotational speed, resolving precision errors from stator temperature assumptions.

A motor controller positions a brushless motor rotor immediately upon power supply using phase coil current injection.

Segmenting the power supply isolates voltage instability across microprocessors, improving reliability while reducing manufacturing costs.

A five-step servo adjustment method measures load characteristics and maximizes stiffness indexes to enable proper motor drive tuning.

A boost converter control device sets voltage commands based on counter electromotive voltage and torque.

A control unit estimates calibration coefficients using measured current and angular acceleration data from an electronically commutated motor.

A motor drive controller detects rotation state by comparing phase counter-electromotive voltages against a reference voltage at zero-cross events.

A motor driving control device adjusts PWM signal overlapping periods to manage current flow across multiple motors.

A steering control apparatus differentiates command values for motor coils based on torque thresholds to distribute power supply across systems.

A brushless motor control module switches between Hall element and inductance detection methods to manage rotor position sensing.

A motor drive device calculates initial rotor angular position using voltage pulses and transitions to sensorless control.

A drive circuit senses residual rotor speed and direction to apply a calculated braking pulse before forward rotation.

The driving device uses back electromotive force and hall signals to determine initial rotation states, eliminating sensor costs while reducing startup noise.

Segmented magnet arrays with majority voting eliminate measurement errors from gaps, enabling accurate position determination on curved tracks.

A resilient recoverable component connects the handle to the scooter body, enabling precise directional control via elastic deformation.

Feedback from encoders and torque sensors adjusts motor speeds to prevent excessive speed and data loss.

A three-phase AC voltage startup signal accelerates brushless DC motors using a preprogrammed frequency ramp function.

A motor driving circuit uses a digital pulse width modulator to generate controlling pulses for an electric fan.

Segmented control architecture blends open loop current regulation with EMF-based observers to eliminate low-speed oscillations in sensorless AC motor drives.

Integrating rectifier, capacitors, and motor switches on one circuit board reduces heat generation and connection failures in handheld power tools.

Pre-charge circuitry isolates motor drives from common DC buses during faults, preventing in-rush current damage without bulky circuit breakers.

Segmenting torque calculation from feedback control balances processing load between dual motor controllers.

Segmenting the blower into multiple independent fans reduces noise while maintaining airflow, avoiding the trade-off between capability and volume.

A drive circuit synchronizes multiple parallel electric motors using a digital signal processor to generate PWM signals based on measured stator phase currents.