Electromagnetic Actuator Control for Thrust Pulsation Suppression
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Solution Overview
Problem
Pulsations in thrust and torque output from force generating mechanisms, such as electromagnetic actuators, due to cogging force and iron loss, cause deviations from desired force values, affecting ride comfort and steering stability in vehicles.
Innovation Solution
A control device that includes a command value acquisition means, relative displacement acquisition means, and actual movement direction acquisition means to correct the generation force command value based on the movement direction and actual direction of the armature, using a controller to adjust thrust in electromagnetic actuators to suppress pulsations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a force generating mechanism including a permanent magnet and an armature is used to generate adjustable force, then the force generation capability is improved, but pulsations (thrust pulsation and torque pulsation) are generated due to cogging force and iron loss, causing the thrust or torque output to deviate from the desired value
Solution Approach 1:
The control device employs feedback control by acquiring the actual movement direction of the armature with respect to the permanent magnet through a stroke sensor, comparing it with the movement direction command, and correcting the generation force command value based on the deviation. This closed-loop feedback mechanism compensates for pulsations and cogging forces, maintaining thrust output accuracy while preserving force generation capability.
Solution Approach 2:
The control device dynamically changes the generation force command value parameter based on the relative displacement and movement direction between the armature and permanent magnet. By adjusting the command value in response to detected positional deviations and movement directions, the system compensates for cogging forces and iron losses, reducing thrust pulsation and improving output accuracy.
2Manufacturing precision
If the generation force command value is corrected based on relative displacement and movement direction, then thrust output accuracy is improved, but the device complexity increases due to additional sensors and control mechanisms
Solution Approach 1:
The control device integrates multiple functions into a single control unit that performs command value acquisition, stroke position detection, movement direction determination, and command value correction. By consolidating these functions, the system achieves improved thrust output accuracy while minimizing the increase in device complexity through functional integration rather than adding separate dedicated components for each function.
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
Suppresses pulsations in force generating mechanisms, improving ride comfort and steering stability by aligning thrust output with command values.
Implementation Method 1
a force generating mechanism (e.g., an electromagnetic actuator) including a permanent magnet and an armature that generate an adjustable force between a first member and a second member
Implementation Method 2
a stroke sensor that detects a stroke position of the mover
Data Source
AI summary
A control device controls a generation force of a force generating mechanism including a permanent magnet and an armature that generate an adjustable force between a first member and a second member. The control device includes: a command value acquisition unit that acquires a generation force command value of the force generating mechanism; a relative displacement acquisition unit that acquires a relative displacement of the permanent magnet and the armature; a movement direction command acquisition unit that acquires a movement direction command of the armature with respect to the permanent magnet from the generation force command value; and an actual movement direction acquisition unit that acquires an actual movement direction of the armature with respect to the permanent magnet from the relative displacement. The generation force command value is corrected by acquiring a correction value based on the movement direction command and the actual movement direction.