Rotary Motor Coil Layout for Accurate Temperature Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In rotary electric machines, temperature sensors placed on the outer peripheral side of coils face heat radiation from the housing, leading to lower detected temperatures compared to the actual coil temperature, which can decrease detection accuracy.
Innovation Solution
A rotary electric machine design with a heat radiation accelerating portion on one side of the coil and a temperature detection unit on the opposite side, enhancing cooling effects and improving temperature detection accuracy by minimizing the difference between detected and actual coil temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If temperature sensors are placed on the outer peripheral side of coils to detect coil temperature, then the sensors can be easily positioned and installed, but the detected temperature becomes lower than the actual coil temperature due to heat radiation from the housing, decreasing detection accuracy
Solution Approach 1:
The patent introduces a heat radiation shielding member as an intermediary between the temperature sensor and the housing. This shielding member blocks heat radiation from the housing from reaching the sensor, allowing the sensor to accurately detect coil temperature without being influenced by housing heat radiation, thus resolving the contradiction between easy installation and accurate measurement
Solution Approach 2:
The patent extracts the heat radiation factor from the sensor's detection environment by positioning the sensor in a location shielded from housing heat radiation. This allows the sensor to measure only the coil's thermal influence, separating the measurement from the interfering housing heat radiation and improving detection accuracy
2Loss of energy
If heat radiation accelerating portions are added to enhance cooling effects, then heat dissipation efficiency is improved, but device complexity increases
Solution Approach 1:
The housing serves multiple functions: it provides structural support, contains the motor components, and acts as a heat radiation surface for cooling. By making the housing itself the heat radiation accelerating portion through surface treatment or fin structures, the patent enhances heat dissipation without adding separate cooling components, thus improving energy loss while minimizing increased device complexity
Solution Approach 2:
The patent merges the heat dissipation function with the existing housing structure. Instead of adding separate cooling mechanisms, the housing is designed with heat radiation accelerating features such as increased surface area or enhanced emissivity, combining the structural and thermal management functions into a single component
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
The configuration improves temperature detection accuracy for the coil while enhancing the cooling effect, ensuring more precise temperature monitoring and efficient heat dissipation.
Implementation Method 1
a heat radiation accelerating portion provided on one of an inner side and an outer side of the coil in a radial direction of the rotation axis and configured to accelerate heat radiation of the coil toward one side
Implementation Method 2
a temperature detection unit accommodated in the housing, provided on an opposite side of the coil from the heat radiation accelerating portion in the radial direction, and configured to detect an internal temperature of the housing
Data Source
AI summary
A motor device includes a motor housing, a stator coil, and a temperature sensor. The motor housing accommodates the stator coil and the temperature sensor. In the motor housing, motor fins are provided on a motor outer peripheral surface. The motor fins are provided on a radially outer side of the stator coil. The temperature sensor is provided on a radially inner side of the stator coil. In the motor device, heat radiation of the stator coil toward the radially outer side is accelerated by the motor fins such that heat radiated from the stator coil toward the radially outer side is more than heat radiated from the stator coil toward the radially inner side.