Elevator Control Device Segmentation for Braking Torque
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Solution Overview
Problem
Existing elevator systems face challenges in maximizing braking torque during emergency stops and rescue operations, particularly when the control panel is located at the uppermost part of the hoistway, leading to increased resistance in the three-phase short circuit and reduced braking effectiveness.
Innovation Solution
The elevator control device incorporates independent circuits for emergency-stop and brake-release short-circuiting, with the emergency-stop circuit being automatically short-circuited in the control panel and the brake-release circuit being manually short-circuited in the hall indicator box, reducing wiring resistance and maintaining high braking torque utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control panel is located at the uppermost part of the hoistway, then the braking torque utilization is maximized during emergency stops, but the accessibility for manual operations becomes difficult
Solution Approach 1:
The patent divides the short-circuiting function into two independent circuits: an automatic short-circuit circuit located in the control panel at the uppermost part of the hoistway, and a manual short-circuit circuit located in the hall indicator box at accessible floors. This segmentation allows the automatic braking function to remain in the optimal location while providing manual operation capability at accessible locations.
2Reliability
If the control panel is located at the uppermost part of the hoistway, then the braking torque is maximized, but the wiring resistance increases reducing braking effectiveness
Solution Approach 1:
The patent segments the short-circuiting function into two independent circuits with different locations and purposes. The automatic short-circuit circuit in the control panel uses short wiring for maximum braking torque during emergencies, while the manual short-circuit circuit in the hall indicator box provides operational accessibility without compromising the automatic circuit's performance.
3Device complexity
If a single short-circuit circuit is used for both emergency stop and brake release, then the device complexity is reduced, but the braking torque utilization is insufficient during rescue operations
Solution Approach 1:
The patent implements two independent short-circuit circuits: an automatic short-circuit circuit for emergency stops that provides immediate maximum braking torque, and a manual short-circuit circuit for rescue operations that allows controlled braking torque application. This segmentation enables optimal braking torque utilization for each specific operational scenario.
Solution Approach 2:
The patent provides dynamic control over braking torque application through two independent circuits. The automatic circuit provides immediate full braking torque for emergency stops, while the manual circuit allows operators to control braking torque application during rescue operations, adapting the braking force to the specific rescue situation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration facilitates efficient brake release operations while maximizing braking torque by minimizing circuit resistance during emergency stops and maintaining effective braking torque utilization, even when the control panel is inaccessible due to its elevated location.
Implementation Method 1
a braking torque obtained from a three-phase short circuit in windings of a hoist motor
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
To provide an elevator control device which facilitates an operation at the time of brake release while maximizing the utilization of a braking torque by reducing the resistance value of a circuit to be short-circuited at the time of emergency stop. The control device is provided with a manual short-circuit portion (second short-circuit portion) 7 which uses the braking torque obtained from a three-phase short-circuit in windings of a hoist motor 1 for prevention of speed increase of an elevator car at the time of a rescue operation by means of brake release. A manual short terminal 7A of the manual short-circuit portion 7, which is short-circuited by a shorting connector 6, is disposed in a hall indicator box 9 provided at a floor. An automatic short-circuit portion (first short-circuit portion) 5 for generating the braking torque by short-circuiting the windings of the hoist motor 1 in three phases at the time of emergency stop is disposed in a control panel 8 accommodating the control device.