Revolving Door Drive Compensating Force Fluctuation
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Solution Overview
Problem
Revolving door systems experience non-uniform external friction forces leading to speed fluctuations and operating noise inconsistencies, affecting user comfort and perceived quality.
Innovation Solution
A method and apparatus that utilize an electronically commutated multi-pole motor with a laminated stator and rotor for direct, gearless drive, coupled with an evaluation unit to determine and compensate for force and torque fluctuations through a learning process, generating a predefined electrical signal to maintain uniform rotational movement and sound patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional electric drive with gear is used to drive the turnstile, then the door leaf can be driven, but non-uniform external friction forces cause speed fluctuations and operating noise inconsistencies
Solution Approach 1:
The system performs a learning run before normal operation to detect and store the non-uniform external friction forces as a function of rotational position. This preliminary measurement allows the control unit to prepare compensation values in advance, which are then applied during actual operation to counteract the friction variations and maintain uniform rotational speed.
Solution Approach 2:
The system uses sensors (force sensor, current sensor, or high-resolution position sensor) to continuously monitor operational parameters during the learning run. The control unit processes this feedback information to determine the actual friction characteristics, then uses this data to generate compensating control signals that are applied to the electric drive, creating a closed-loop system that eliminates speed fluctuations.
2Object-generated harmful factors
If a conventional electric drive with gear is used, then the turnstile can be driven, but torque fluctuations result in non-uniform operating noise
Solution Approach 1:
During the learning run, the system preliminarily identifies the torque fluctuations and their relationship to rotational position. The control unit stores this information and prepares compensating control signals in advance, which are then applied during normal operation to maintain uniform torque delivery and eliminate noise variations, ensuring consistent quality perception.
3Speed
If a learning run is performed to detect force fluctuations, then compensation can be applied, but additional time is required for the learning process
Solution Approach 1:
The learning run can be performed partially or incrementally, focusing on detecting the critical friction characteristics needed for compensation. The system applies compensation based on the detected patterns, which may not require complete precision but sufficient accuracy to eliminate noticeable speed fluctuations, thereby reducing the time investment while maintaining effectiveness.
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 ensures a uniform rotational movement and consistent sound pattern, enhancing user comfort and quality perception by effectively compensating for external force and torque fluctuations.
Implementation Method 1
an electric drive with a stator and a rotor... an electronically commutated multi-pole motor with a stator comprising a laminated stator core and a plurality of coils, and a rotor comprising a laminated rotor core and a plurality of permanent magnets
Implementation Method 2
a rotor comprising a laminated rotor core and a plurality of permanent magnets
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A revolving door arrangement and a method for compensating a force fluctuation acting non-uniformly on a door leaf (3) of a revolving door arrangement (1) depending on a rotation position from the outside are proposed.The revolving door arrangement (1) comprises: - a turnstile (2) supporting the door leaf (3), - an evaluation unit and - an electric drive (8) with - a stator and - a rotor, wherein the rotor can be arranged coaxially to a rotation axis (4) of the turnstile (2) and can be connected to the turnstile (2) for direct, gearless drive, and the method comprises the steps of: - rotating the turnstile (2), - determining the force fluctuation and/or a rotational speed fluctuation and/or torque fluctuation acting externally on the door leaf (3) as a function of the rotational position and - controlling the stator with an electrical signal predefined on the basis of the force fluctuation and/or the rotational speed fluctuation determined as a function of the rotational position, by means of which the force fluctuation and/or the rotational speed fluctuation and/or the torque fluctuation are compensated.