Gearless Revolving Door Drive Torque and Vibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional revolving door drives are bulky, costly, and lack flexibility for different door variants, with high cogging torque issues at low speeds and small masses, which affects vibration and quiet operation.
Innovation Solution
A compact, gearless electric drive using an electronically commutated multi-pole motor with laminated cores and permanent magnets, optimized for low detent torque and high power density, allowing for flexible design and installation in various door sizes with minimal vibration and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional electric drives with asynchronous motors and multi-stage gears are used, then sufficient drive torque is achieved, but the drive becomes bulky and loses compactness
Solution Approach 1:
The patent extracts and eliminates the gear transmission stages from the drive system, using a direct-drive configuration where the motor rotor is directly coupled to the turnstile. This removes the bulky gear components while maintaining sufficient drive torque through optimized motor design with permanent magnets and laminated cores.
Solution Approach 2:
The patent transitions from a multi-stage mechanical transmission approach to a direct electromagnetic drive, changing the dimensional arrangement by eliminating intermediate transmission components and achieving compactness through optimized motor geometry with radial and axial dimensions carefully balanced.
2Power
If high cogging torque is present in the motor, then sufficient drive torque is achieved, but vibration and noise increase affecting quiet operation
Solution Approach 1:
The patent optimizes motor parameters including the number of magnets, their arrangement, and the laminated core structure to achieve a balance where sufficient drive torque is produced while cogging torque is minimized. The electronically commutated multi-pole motor design with specific pole configurations reduces vibration and noise during operation.
3Reliability
If conventional multi-stage gear drives are used, then reliable torque transmission is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent removes the complex multi-stage gear transmission system and replaces it with a simple direct-drive configuration. The motor rotor is directly connected to the turnstile, eliminating gears, shafts, and associated components, thereby reducing device complexity and manufacturing cost while maintaining reliable torque transmission.
4Power
If conventional drives are used, then adequate performance is achieved, but adaptability to different revolving door variants is limited
Solution Approach 1:
The patent designs a universal motor platform with electronically commutated multi-pole configuration that can be adapted to different revolving door variants by adjusting motor parameters such as number of poles, magnet arrangement, and control electronics. This single platform design provides adequate performance across multiple applications while enhancing adaptability.
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 provides a compact, low-maintenance drive with high power density, enabling quiet and smooth operation while offering design flexibility for different revolving door sizes, reducing cogging torque and enhancing installation options.
Implementation Method 1
The rotor includes a rotor lamination stack mounted on a rotor disk... In the rotor, several permanent magnets are arranged radially on the inside of the laminated rotor core... The stator includes a stator core and several coils
Implementation Method 2
The correspondingly high power density of the drive is achieved through the use of laminated cores for the stator and for the rotor... the laminated stator core being mounted on the stator disk... the laminated rotor core
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a revolving door (1) comprising a turnstile (2) with at least two door leaves (3), wherein the turnstile (2) is rotatable about a pivot axis (5), wherein an axial direction (5) and a radial direction (6) perpendicular to the axial direction (5) are defined along the pivot axis (5), and an electric drive (8) designed as an electronically commutated multipole motor with a stator (10) comprising a stator lamination stack (11) and several coils (13), and a rotor (17) comprising a rotor lamination stack (18) and several permanent magnets (19), wherein the rotor (17) is arranged coaxially to the pivot axis, and is connected to the turnstile (2) for direct, gearless drive.