Electromagnetic Actuator Armature Geometry for Low Thrust Pulsation
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Solution Overview
Problem
Existing electromagnetic actuator devices using linear motors face issues with magnetic flux imbalance leading to thrust pulsation and increased magnetic saturation, which affects thrust efficiency.
Innovation Solution
The electromagnetic actuator device is designed with a specific relationship between the minimum sectional areas of tooth end portions and the yoke, optimizing the armature and magnet configuration to balance magnetic flux and reduce pulsation while maintaining thrust.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the sectional area of teeth located at one end portion is reduced to reduce pulsation, then thrust pulsation is reduced, but magnetic saturation occurs and thrust decreases
Solution Approach 1:
The patent applies local quality by creating an asymmetric tooth structure where one end portion has a smaller sectional area than the other. Specifically, the first end portion of the teeth has a smaller cross-sectional area than the second end portion, which locally modifies the magnetic flux distribution to reduce pulsation while maintaining adequate thrust through the larger second end portion
Solution Approach 2:
The patent implements asymmetry by designing the teeth with unequal end portion areas. The first end portion area is deliberately made smaller than the second end portion area, creating an asymmetric magnetic circuit that balances the magnetic flux interlinking across different phases and reduces thrust pulsation without causing magnetic saturation
2Device complexity
If the sectional area of teeth located at the end portion is excessively reduced, then magnetic flux imbalance occurs due to saturation, but thrust pulsation increases
Solution Approach 1:
The patent applies parameter changes by optimizing the sectional areas of the tooth end portions. The first end portion has a smaller area than the second end portion, creating a specific area ratio that changes the magnetic flux distribution parameters to achieve balance across phases while preventing saturation and reducing pulsation
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 results in reduced thrust pulsation and increased thrust efficiency by minimizing magnetic saturation and optimizing magnetic flux distribution.
Implementation Method 1
a winding wound around the plurality of slots
Implementation Method 2
an electromagnetic actuator device using a linear motor
Implementation Method 3
a magnet portion includes a plurality of magnets that face the plurality of teeth via an air gap
Data Source
AI summary
An electromagnetic actuator device reduces pulsation and improves thrust, and includes: a magnet; and an armature that moves relative to the magnet. The armature includes: a plurality of teeth formed in a relative movement direction; a plurality of slots between the plurality of teeth; a yoke connecting the plurality of teeth; and a winding around the plurality of slots. The magnet includes a plurality of magnet portions facing the plurality of teeth via a gap and are disposed in the relative movement direction. A relationship between a minimum sectional area Sc1 of one tooth end portion of the armature and a minimum sectional area Sc2 of the other tooth end portion is Sc1>Sc2; and a relationship between the minimum sectional area Sc2 of the other tooth end portion and a sectional area Sy of the yoke in a direction crossing the relative movement direction is Sc2≥Sy.