Actuator Motor Thermal Management via Extraction and Housing Integration
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Solution Overview
Problem
Conventional electronically controlled actuators for turbochargers face issues with increased motor temperature due to radiation heat from the turbine housing, leading to reduced lifespan and complex assembly processes.
Innovation Solution
The actuator design includes a top-opened actuator housing with motor support posts to position the motor away from the turbine housing, reducing radiation heat exposure and simplifying assembly with a cover that guides attachment and integrates anti-rotation and pressurizing functions into a single plate, reducing component count and improving workability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the motor is arranged close to the turbine housing to transmit rotation driving force, then the actuator structure is compact, but the motor temperature increases due to radiation heat from the turbine housing, shortening the lifetime of the motor
Solution Approach 1:
The motor is extracted from the heat-affected zone by arranging it on the compressor housing side away from the turbine housing, while maintaining the compact actuator structure through integrated housing design. The motor support post positions the motor optimally to reduce heat exposure while preserving structural compactness.
Solution Approach 2:
The actuator housing serves as an intermediary structure that spatially separates the motor from the heat source (turbine housing) while still enabling functional integration. The housing acts as a thermal barrier and structural mediator between the motor and the turbine system.
2Reliability
If the control board, motor, and reduction gear mechanism are housed in separate housings fastened with screws, then each component is protected, but the configuration becomes complicated with a great number of parts, increasing assembly time
Solution Approach 1:
Multiple protective functions (control board housing, motor housing, reduction gear housing) are merged into a single integrated actuator housing structure. This consolidation reduces the number of separate parts and fastening operations while maintaining comprehensive protection for all internal components through the unified housing design.
Solution Approach 2:
The actuator housing performs multiple functions simultaneously: it protects the control board, motor, and reduction gear mechanism; provides structural support; and serves as a mounting interface. This multi-functionality eliminates the need for separate protective housings for each component.
3Reliability
If a heat shield is added to protect the motor from radiation heat, then the motor lifetime is extended, but the device complexity increases and assembly becomes more complicated
Solution Approach 1:
Instead of adding a heat shield, the motor is extracted from the heat-affected zone by repositioning it on the compressor housing side. This eliminates the need for additional heat protection components while extending motor lifetime through reduced thermal exposure.
Solution Approach 2:
The compressor housing, which is naturally cooler than the turbine housing, is utilized as a beneficial thermal environment for the motor. By positioning the motor on the compressor housing side, the cooler thermal characteristics of the compressor housing provide passive heat protection, converting the housing arrangement into a thermal benefit.
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 effectively reduces motor temperature, prolongs actuator lifespan, and simplifies assembly by minimizing heat exposure and component complexity, while maintaining vibration resistance and efficient operation of the nozzle vanes.
Implementation Method 1
the temperature of the motor is increased by receiving the radiation heat from the turbine housing 3 heated by the exhaust gas of the engine
Data Source
AI summary
The base of an actuator housing 10 is arranged to face the side of a turbine housing, and a motor 16 is fixed to a motor support post that is protrusively provided toward the top of the actuator housing 10 such that the motor 16 is kept at a distance from the turbine housing.