Linear Motor Suspension Damping in Irregular Stroke Regions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrically powered suspension systems using linear motors for vibration damping fail to provide accurate damping with low power consumption when the stroke reaches an irregular region.
Innovation Solution
The system incorporates a linear motor with a rod member and a housing that are freely movable along the axis, where the rod member is equipped with armature coils and the housing has permanent magnets for electromagnetic induction, and the armature coils at the ends have electromagnetic braking parts to restrict movement, allowing for efficient damping even in irregular regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the stroke of the linear motor reaches an irregular region, then the vibration damping accuracy deteriorates, but the power consumption increases
Solution Approach 1:
The stroke range is divided into a regular region and an irregular region. Different control strategies are applied to each region: in the regular region, standard vibration damping control is used, while in the irregular region, the driving force is restricted to prevent excessive power consumption and maintain damping accuracy.
Solution Approach 2:
The control parameter (driving force) is changed based on the stroke region. When the stroke reaches the irregular region, the driving force is restricted or limited, whereas in the regular region, the full vibration damping control is applied. This dynamic parameter adjustment resolves the contradiction between damping accuracy and power consumption.
2Force
If the linear motor operates in the irregular region, then the damping force decreases, but the system stability is compromised
Solution Approach 1:
The system takes preliminary action by detecting when the stroke approaches the irregular region and restricts the driving force before the system stability is compromised. This preventive measure ensures that the linear motor does not operate in a state that would cause excessive damping force loss or instability.
Solution Approach 2:
The control system dynamically adjusts the driving force restriction based on the real-time stroke position. When the stroke is within the regular region, full damping force is applied; when it reaches the irregular region, the driving force is dynamically restricted. This dynamic adaptation maintains system stability while optimizing damping performance.
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
This configuration enables accurate vibration damping with low power consumption and improved system efficiency by utilizing electromagnetic braking to suppress movements in irregular stroke regions.
Implementation Method 1
The stator is provided with an armature coil along the axis over an outer peripheral surface of its cylinder. On the other hand, the moving element is provided with a permanent magnet along the axis on its entire inner peripheral surface of the hollow cylinder. The electrically powered suspension system generates an attractive force and a repulsive force between the armature coil of the stator and the permanent magnet of the moving element to cause the forces to drive the moving element to extend and contract in the axis with respect to the stator when the armature coil of the stator is excited.
Implementation Method 2
the armature coils located on ends of the rod member among the plurality of the armature coils are provided with electromagnetic braking parts that restrict the relative back and forth movements along the axis between the rod member and the housing
Data Source
AI summary
An electrically powered suspension system performs an accurate vibration damping of a vehicle with low power consumption even if a linear motor of an electromagnetic actuator strokes to reach an irregular region and includes an electromagnetic actuator generating a driving force for the vibration damping. A linear motor of the actuator includes a cylindrical rod member provided with a plurality of on-rod armature coils along its axis and a housing surrounding the rod member, mounted movable back and forth along the axis with respect to the rod member, and provided with a plurality of permanent magnets along the axis. The on-rod armature coils located on ends of the rod member are provided with short-circuit parts b suppressing the rod member and the housing from moving back and forth with respect to each other.