Brake Magnetizing Coil Energizing Circuit Voltage Control
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Solution Overview
Problem
Energizing circuits for operational brakes in passenger conveyors, such as escalators and elevators, face challenges in extending the lifetime and reducing servicing requirements, particularly due to excessive heating of magnetizing coils when continuously energized.
Innovation Solution
The implementation of a reduced voltage circuit with a controllable operation switch that outputs two different voltage signals to the magnetizing coil, switching to a lower voltage after the brake is released to prevent excessive heating, and using a rectifying bridge as both the reduced voltage circuit and operation switch, allowing for efficient control of voltage based on the operational state of the brake.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full voltage is continuously applied to the magnetizing coil to keep the brake open, then the brake remains reliably open, but the magnetizing coil experiences excessive heating and reduced lifetime
Solution Approach 1:
The patent applies periodic action by switching the magnetizing coil between full voltage (during brake release) and reduced voltage (during brake holding) states. This periodic voltage adjustment prevents continuous overheating while maintaining brake reliability, directly resolving the contradiction between reliability and temperature.
Solution Approach 2:
The patent changes the voltage parameter applied to the magnetizing coil based on operational phase. Full voltage is applied during brake release, then switched to reduced voltage for brake holding. This parameter change allows the system to maintain reliability while reducing thermal stress and extending component lifetime.
2Speed
If full voltage is applied to the magnetizing coil, then the brake releases quickly and reliably, but energy consumption increases and lifetime decreases
Solution Approach 1:
The system uses periodic voltage application where full voltage is applied only during the brief brake release phase, then switches to reduced voltage or zero voltage during the holding phase. This periodic action achieves fast brake release when needed while minimizing overall energy consumption.
Solution Approach 2:
The patent applies partial action by using full voltage only when necessary for brake release, then reducing to minimal or zero voltage for brake holding. This partial application of voltage achieves the required brake release speed while significantly reducing energy consumption compared to continuous full voltage application.
3Reliability
If full voltage is continuously applied to the magnetizing coil, then the brake remains open, but the energizing circuit lifetime is reduced due to excessive heating
Solution Approach 1:
The patent implements periodic voltage switching where full voltage is applied during brake release and then switched to reduced voltage during brake holding. This periodic action maintains brake reliability while reducing thermal stress on the energizing circuit components, thereby extending their operational lifetime.
Solution Approach 2:
The system changes the voltage parameter from full voltage to reduced voltage after brake release. This parameter change maintains the brake in the open state while reducing heat generation in the energizing circuit, directly extending component lifetime while preserving reliability.
4Duration of action of stationary object
If a reduced voltage circuit with controllable switch is implemented, then heating is reduced and lifetime is extended, but device complexity increases
Solution Approach 1:
The patent applies multi-functionality by designing the controllable switch to serve multiple purposes: it acts as both the switching element for voltage reduction and as part of the control logic for detecting brake release completion. This universal approach reduces overall system complexity while achieving the goal of extended energizing circuit lifetime.
Solution Approach 2:
The patent merges the reduced voltage circuit and controllable switch into an integrated control unit that combines voltage regulation and switching functions. This merging reduces component count and simplifies the overall device structure while maintaining the benefit of reduced heating and extended lifetime.
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 solution significantly extends the lifetime of the energizing circuit, potentially beyond 10 million energizing events, reduces servicing needs, and minimizes heating of the magnetizing coil, leading to a more reliable and service-free operational brake system.
Implementation Method 1
a rectifying bridge as both the reduced voltage circuit and operation switch
Implementation Method 2
the magnetizing coil of the operational brake must be energized for opening the operational brake
Data Source
AI summary
The invention relates to an energizing circuit of at least one magnetizing coil of an operational brake, the energizing circuit being configured for energizing the magnetizing coil, which energizing circuit comprises a rectifying bridge connected to the supply network, the output terminals of the rectifying bridge being connectable/connected to the input points of the magnetizing coil,characterized in that the energizing circuit comprises at least one reduced voltage circuit or external DC supply, whose outputs are connectable via to the to the input points of the magnetizing coil via a controllable operation switch of the energizing circuit. The patent application also comprises claims for a passenger conveyor and for a method.