Piston Guide Ring Damping for Electromagnetic Brake Noise
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Solution Overview
Problem
Conventional quiescent-current-actuated electromagnetic spring pressure brakes generate noise due to abrupt deceleration and metal-on-metal contact between the armature plate and sleeve, particularly in low-noise applications like theatre stage and lift technologies, where existing noise damping solutions like O-rings are not optimal.
Innovation Solution
Incorporating at least one piston guide ring on the outer sleeve diameter, in addition to an O-ring, to facilitate axial movement of the armature plate and provide circumferential damping, preventing direct contact and absorbing high loads during braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the clearance between the armature plate and sleeve is made very small to reduce noise, then noise damping is improved, but the armature plate may directly strike the sleeve during abrupt deceleration, causing impact noises and squeals
Solution Approach 1:
A piston guide ring is introduced as an intermediary element between the armature plate and the sleeve. This ring prevents direct metal-to-metal contact while maintaining the small clearance necessary for noise damping. The piston guide ring absorbs impact loads during abrupt deceleration, eliminating impact noises and squeals that would occur with direct contact.
Solution Approach 2:
The piston guide ring functions as a flexible element that can deform elastically under load. This flexibility allows it to cushion the armature plate during abrupt deceleration, preventing direct strikes against the sleeve while maintaining continuous contact for noise damping purposes.
2Object-affected harmful factors
If an O-ring is used to maintain the coil carrier in its central position to attenuate noises, then noise damping is improved, but high braking torque surges may still cause the armature plate to strike the sleeve, resulting in undesirable noise
Solution Approach 1:
The solution combines two different damping elements: an O-ring for radial centering and a piston guide ring for axial impact damping. This composite approach uses materials with different properties - the O-ring provides radial compliance while the piston guide ring provides axial impact absorption, together achieving superior noise damping across all operating conditions.
3Object-affected harmful factors
If the armature plate is mounted on the sleeve for axial movement with a small clearance, then noise damping is improved, but the armature plate cannot easily move axially under high load conditions
Solution Approach 1:
The piston guide ring serves as a mediator that facilitates axial movement under load. By providing a low-friction contact surface and absorbing impact loads, it enables the armature plate to move axially easily during normal operation while preventing direct strikes during high-load deceleration events.
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 piston guide ring effectively reduces noise by allowing axial movement and distributing braking torque, preventing metal-on-metal contact and enhancing noise damping in low-noise applications.
Implementation Method 1
The piston guide ring permits an axial movement of the armature plate under very good slip conditions
Implementation Method 2
damping is obtained in the circumferential direction as the armature plate does not directly strike the sleeve any longer but is kept away from the sleeve by the piston guide ring
Data Source
AI summary
A quiescent-current-actuated electromagnetic spring pressure brake including torque transmission sleeves disposed between a machine wall and the brake, and an axially movable armature plate having bores along its periphery to receive the torque transmission sleeves. At least one piston guide ring is provided in the area of torque transmission sleeves on the outer periphery of the latter adjacent an O-ring disposed in a groove, said piston guide ring being placed in the groove of said O-ring or in a separate groove and acting to provide a damping action in the circumferential direction and a sliding displacement of the armature plate in the axial direction.