High-Temperature Torque Motor Actuator Design
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Solution Overview
Problem
Torque motor actuators used in high-temperature environments, such as near aircraft gas turbine engines, require remote mounting due to their inability to withstand high temperatures, increasing system complexity and cost.
Innovation Solution
A torque motor actuator design featuring a first and second magnetic pole piece of opposite polarities, an armature rotationally mounted between them, and a coil that generates a magnetic force to rotate the armature, with the coil being external to the pole pieces and capable of withstanding high temperatures, allowing direct mounting on air valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the torque motor actuator is remotely mounted away from the engine, then the actuator can avoid high temperatures, but the system complexity and cost increase
Solution Approach 1:
The patent changes the temperature parameter threshold by selecting materials and designing a coil structure that can withstand temperatures up to 260°C or higher, allowing the actuator to be mounted directly on the engine without remote positioning
Solution Approach 2:
The patent extracts the coil from the traditional enclosed magnetic circuit structure and positions it externally between the pole pieces, allowing the coil to be exposed to cooling airflow while the magnetic pole pieces remain protected, thereby enabling high-temperature operation
2Use of energy by moving object
If the coil is surrounded by magnetic pole pieces, then magnetic flux efficiency is improved, but the coil cannot withstand high temperatures
Solution Approach 1:
The patent uses the magnetic pole pieces as intermediaries that conduct magnetic flux from the externally positioned coil to the armature, allowing the coil to be positioned externally where it can be cooled while still achieving efficient magnetic flux through the pole piece mediation
Solution Approach 2:
The patent repositions the coil from an internal enclosed position to an external position between the pole pieces, changing the spatial dimension of coil placement to enable both efficient magnetic flux generation and thermal management through external cooling airflow
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
Enables direct mounting on air valves, reducing system complexity and cost while maintaining high-temperature operation, with increased efficiency and reduced power requirements due to optimized magnetic flux usage and larger coil wire size.
Implementation Method 1
The coil is adapted to receive electric current and is configured, upon receipt thereof, to generate a magnetic force that causes the armature to rotate
Implementation Method 2
The first magnetic pole piece is of a first magnetic polarity. The second magnetic pole piece is of a second magnetic polarity, and is spaced apart from the first magnetic pole piece to define a gap
Data Source
AI summary
A torque motor valve actuator includes a first magnetic pole piece, a second magnetic pole piece, an armature, and a coil. The first magnetic pole piece is of a first magnetic polarity. The second magnetic pole piece is of a second magnetic polarity, and is spaced apart from the first magnetic pole piece to define a gap. The armature is rotationally mounted and disposed in the gap between the first and second magnetic pole pieces. The coil surrounds at least a portion of the armature and is disposed such that it is not surrounded by either the first magnetic pole piece or the second magnetic pole piece. The coil is adapted to receive electric current and is configured, upon receipt thereof, to generate a magnetic force that causes the armature to rotate.