Revolving Door Drive Unit with Integrated Motor Braking
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Solution Overview
Problem
Conventional drive units for revolving doors with electronically commutated multi-pole motors require significant installation space due to the need for gears and braking devices, which compromises the compact design advantage of these motors.
Innovation Solution
A drive unit with a disk-shaped or cup-shaped multi-pole motor featuring a gearless connection between the stator and rotor parts, incorporating an engagement device for blocking and braking, allowing for a compact design with a high height-to-diameter ratio, and an integrated blocking device that can be remotely activated to secure the turnstile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional drive unit with gear and braking device is used, then the braking function is achieved, but the installation space requirement increases
Solution Approach 1:
The patent merges the braking device with the multi-pole motor by integrating the blocking device into the motor structure. The blocking device is positioned between the stator and rotor parts of the motor, combining two previously separate functions (motor drive and braking) into a single integrated unit, thereby reducing installation space while maintaining braking capability
Solution Approach 2:
The blocking device is nested within the multi-pole motor structure. The blocking element is arranged in the air gap between the stator and rotor parts, utilizing the existing motor geometry to house the braking function without requiring additional external space
2Reliability
If a wheel disc brake design is used, then the braking function is achieved, but the overall height of the drive unit increases
Solution Approach 1:
The patent transitions from a conventional wheel disc brake design (which requires significant axial height) to a blocking device that operates radially within the air gap of the motor. This dimensional change allows the braking function to be achieved without increasing the overall height of the drive unit, instead utilizing the radial space already present in the motor structure
3Ease of operation
If gears and transmitting components are used, then the drive function is achieved, but the device complexity increases
Solution Approach 1:
The patent removes gears and other transmitting components from the drive unit, achieving direct drive where the rotor part of the motor is directly connected to the turnstile. This extraction of unnecessary intermediate components simplifies the device structure while maintaining the drive function
Solution Approach 2:
The patent replaces the mechanical gear transmission system with a direct electromagnetic drive. The multi-pole motor provides direct torque to the turnstile through electromagnetic fields, eliminating the need for mechanical gears and reducing device complexity
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
The solution enables a compact, space-efficient drive unit that can achieve high holding torques and rapid braking of the turnstile, essential for safety, while maintaining the advantages of a minimal installation footprint and allowing for quick access control.
Implementation Method 1
coil elements (21) and magnet elements (22) which are arranged between the stator part (10) and the rotor part (12)
Implementation Method 2
The blocking device (27) has a magnet coil (17) and a magnet armature (18), which are connected to the blocking element (15)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The unit has an electronically commutated multipole motor (1) comprising a disk-shaped or cup-shaped stator part arranged at a stationary structural component part (11) of a revolving door (100). A disk-shaped or cup-shaped rotor part is gearlessly connectable to a star handle (13) of the revolving door. An engagement device (14) is arranged between the stator part and the rotor part and provided for intervening into rotational movement of the rotor part at the stator part, where the stator part and the rotor part are in a plane-parallel arrangement with respect to one another.