Entrance Control
Safe Entry, Safe Exit
Safety and Reliability – Overload Clutches for Entrance Control Systems
Why Entrance Control Systems Require Specialised Drive Technology
Turnstiles, barriers and access control systems are designed to attract as little attention as possible. They open when access is authorised, remain closed when it is not, and operate reliably whether employees are arriving at the start of the day, stadium gates are opening to thousands of visitors, or passengers are flowing through a busy transport hub.
Behind this apparent simplicity lies sophisticated drive technology. Every movement must be executed quickly, precisely and reliably.
Mechanical components require protection against blockages, misuse and unexpected loads. At the same time, these systems are expected to operate quietly, efficiently and with minimal maintenance, often across millions of operating cycles.
Couplings and brakes play a central role in achieving this. They control motion, secure positions, limit torque and help protect the mechanical system when someone walks into a barrier arm or a turnstile becomes obstructed.
When Access Must Be Secure and Seamless
Mönninghoff components can be used in a wide range of entrance control systems, including
- Tripod turnstiles and speed gates
- Swing gates and flap barriers
- Vehicle and parking barriers
- Ticketing, access control and pedestrian management systems
- Access systems for office buildings, stadiums, airports and transport facilities
- Automated gates and barrier elements
- Systems that must execute movement quickly and predictably following authorisation
The requirements are often contradictory. A barrier should open quickly but without impact. A turnstile should move freely but not continue rotating uncontrollably. A system must switch reliably during normal operation while protecting the mechanics if a blockage occurs.
Requirements for Couplings and Brakes
Entrance control systems place a number of specific demands on drive technology:
- Fast, repeatable switching operations: Opening, closing and locking functions must occur reliably within defined timeframes.
- Reliable overload protection: Obstructions or impacts must not automatically lead to damage to motors, gearboxes or barrier elements.
- Defined torque transmission: Torque must match the mechanical design and desired motion characteristics.
- Controlled acceleration and stopping: Movements should be dynamic yet smooth.
- Secure holding functions: Barrier elements must remain securely positioned when required.
- Long service life: Many systems operate continuously and achieve extremely high cycle counts.
- Compact design: Drives are often housed within narrow columns or confined enclosures.
- Low energy consumption: Efficient operation is particularly valuable where systems spend significant time in standby or holding modes.
- Minimal maintenance requirements: Access systems should remain operational without frequent servicing.
- Straightforward integration: Clutches and brakes must work seamlessly with mechanics, sensors and control systems.
The best solution does not merely protect the equipment. It also considers how people interact with it. In real-world environments, users do not always behave as predictably as a test cycle.
Switching, Protecting and Controlling Motion
Mönninghoff develops clutch and brake systems for entrance control equipment that are tailored to motion profiles, torque requirements, switching frequency and available installation space.
Tooth Clutches as Overload Clutches
When configured appropriately, a tooth clutch can also serve as an overload protection clutch. If torque exceeds a defined threshold, power transmission is interrupted or the mechanism is protected against excessive loading.
This can be particularly beneficial when:
- A turnstile becomes blocked
- A barrier arm encounters an obstacle
- A gate element is physically restrained
- A drive is overloaded due to misuse or foreign objects
- A fault occurs within downstream mechanical components
The overload function can help prevent damage to sensitive components and simplify recommissioning. After all, a minor jam should not necessarily result in major downtime.
Electromagnetic Tooth Clutches
Electromagnetic tooth clutches provide positive engagement and are ideal where a clearly defined mechanical connection between the driving and driven elements is required. In turnstiles, barriers and ticketing systems, they can support controlled engagement and disengagement of motion.
Typical functions include:
- Positive engagement of rotational movement
- Controlled connection and disconnection of drives
- Precise control of locking and opening movements
- Reliable connection between motor, gearbox and output shaft
- Switching operations with minimal backlash
A clearly defined engagement state makes motion more predictable for the control system. And predictability is a highly desirable characteristic in systems designed to manage the movement of people.
Magnetorheological Fluid Brakes
Not every movement should end abruptly. In turnstiles, swing gates and barriers, controlled deceleration can help reduce impact forces, vibration and unnecessary mechanical stress.
Magnetorheological fluid brakes provide continuously adjustable braking torque and can therefore accommodate variable loads and movement profiles.
Typical applications include:
- Smooth deceleration at the end of opening or closing movements
- Controlled operation of gates and barriers with varying masses
- Applications requiring quiet and smooth motion
- Defined deceleration where enhanced safety requirements apply
This transforms a simple "stop" into a carefully controlled movement sequence.
Holding and Braking Systems
Entrance control systems frequently need to hold barrier elements in precisely defined positions. Depending on the design, a holding brake or a combined clutch and brake solution may be appropriate.
Typical functions include:
- Holding a turnstile in a defined position
- Securing a barrier arm during standstill
- Preventing unintended movement during power failures
- Supporting emergency-stop and safety functions
- Enabling controlled restart following interruption
The ideal braking and holding solution depends on factors such as weight, geometry, operating speed and the overall safety concept of the system.
Overload Protection as Part of the Access Concept
Overload protection is often viewed solely as a means of safeguarding the mechanics. In reality, it can contribute simultaneously to equipment longevity, user safety and rapid restoration of service.
A customised solution should therefore consider:
- The torque level at which overload protection activates
- Whether and how the system is reset
- How an overload event is detected by the control system
- The position adopted by the barrier element following activation
- Safe fault-clearing procedures
- Requirements for emergency release and restart
The goal is to ensure that, in the event of a problem, the mechanics respond in a controlled manner rather than continuing to force movement.
Access Technology That Keeps Everything Moving
Whether for turnstiles, barriers, ticketing systems or automated access gates, Mönninghoff develops clutches, brakes and overload protection systems that provide precise switching, secure holding and reliable protection for mechanical components.
Are you developing a new access control system, looking to improve the robustness of an existing installation or searching for a compact solution for high switching frequencies? Speak with our experts about torque requirements, overload protection, braking performance, installation space and control integration. Together, we can ensure secure, reliable and seamless access management.
The Right Solution for Every Access Scenario
A speed gate in an office building operates very differently from a heavy-duty vehicle barrier in a car park or an access system at a stadium. Differences in user frequency, moving masses, operating environments and safety requirements create distinct technical challenges.
When specifying a solution, the following parameters may be relevant:
- Torque and rotational speed
- Mass and inertia of the barrier element
- Opening and closing speed
- Switching frequency and required service life
- Desired braking and damping characteristics
- Overload threshold and reset behaviour
- Available installation space and interface geometry
- Temperature, dust, moisture and other environmental conditions
- Sensors, control systems and diagnostic capabilities
- Requirements for emergency stop, emergency release and safe restart
Mönninghoff develops integrated combinations of clutches, brakes and overload protection systems that are tailored both to the machine design and to the actual operating profile of the installation.
Validate Early, Deploy with Confidence
For entrance control systems, early-stage validation is particularly valuable. Switching behaviour, load handling and overload scenarios can be assessed during prototype development before a solution progresses into large-scale production.
Key questions that can be addressed include:
- Does the system open and close at the required speed?
- Does the barrier element stop smoothly and without excessive vibration?
- Does the overload protection respond reliably to impacts and blockages?
- Does the system remain precise and smooth after extensive cycling?
- Can the solution be integrated effectively with the control and sensor systems?
- Do holding, emergency-stop and restart functions perform as intended?
The result is a robust foundation for a safe, durable and low-maintenance production solution.
Personen >
News >
Jobs >
Kontakt >