Ac Motor Stoppers TRIZ Cases

When a machine brake fails or is overloaded, converter switches and a short-circuiting module dissipate back-EMF to hold elevator speed and position.

Reverse current between selected motor phases enables precise braking and prevents abnormal fan backspin when a fan is removed.

Separating shutoff and speed-based diagnosis from the driver circuit enables motor fault detection and stop across varying driver specifications.

Three-phase voltage sensing checks elevator contactor closure quality and detects abnormal contacts with a simple, low-cost safety circuit.

Regenerative motor energy powers inverter-based dynamic braking during elevator manual rescue, improving stability without oversized motors.

Selective switching in three-phase motor braking dissipates back-EMF energy while limiting return to the battery and protecting electric tools.

Active intermediate-circuit voltage control feeds braking energy back to series battery packs without overloading individual power supply devices.

Selective phase short-circuit braking for BLDC compressor motors limits current, preserves position sensing, and reduces mechanical stress.

Stored capacitor energy keeps the controller switching low-side switches after power loss, extending braking and preventing damaging voltage feedback.

Selective two-phase short-circuit braking keeps one BLDC phase open for back-EMF position tracking while limiting current and wear.

Kinetic energy from the permanent magnet motor powers damping control during voltage interrupts, avoiding passive losses in normal operation.

Dual braking control applies strong motor braking during kickback and gentler trigger-off braking to shorten stop time while limiting recoil.

A short-circuiting module discharges stored regenerative energy to limit back EMF and motor speed when the elevator machine brake is insufficient.

Manual bypass switching keeps elevator motor dynamic braking active during brake release, delivering stable torque in power outages.

A delayed low-frequency reverse phase sequence brakes lightly loaded motors faster, demagnetizes remnant flux, and limits current.

A parallel impedance path supplements the brake resistor to limit DC-link overvoltage and prevent excess energy from damaging the drive system.

Encoder duty cycle switching between half- and full-cycle timing preserves speed resolution and stable inverter motor control.

A fail-safe relay shorts motor leads when unsafe loading or kinetic energy release is detected, enabling controlled exercise machine stopping.

A controller adjusts inverter overcurrent thresholds based on motor rotation speed to manage switching device protection levels.

A bypass unit transmits input power to a motor driving unit, maintaining active braking functionality during normal operation.

Dynamic speed adjustment prevents brake resistor overload while reducing weight and cost.

Localizing brake control circuitry to specific axes reduces manufacturing costs while maintaining braking reliability.