Electric Motor Temperature Sensor Mounting via Elastic Retainer
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Solution Overview
Problem
Conventional electric motors with embedded temperature sensitive devices are difficult to repair or replace, and the resin injection pressure can damage these devices, while retrofitted motors with brackets for maintenance are hard to assemble.
Innovation Solution
An electric motor design featuring a synthetic resin sealing body with a recessed portion for the temperature sensitive device, which is retained by an elastic retaining member between the end cover and the sealing body, allowing for easy assembly and maintenance without risk of resin-induced damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the temperature sensitive device is embedded in the sealing body, then the assembly is simple, but the device cannot be repaired or replaced and may be damaged by resin injection pressure
Solution Approach 1:
The temperature sensitive device is separated from the sealing body and placed in a dedicated accommodating space formed by the end cover and sealing body, allowing independent access and maintenance while maintaining integrated assembly benefits
Solution Approach 2:
A retaining member is introduced as an intermediary component to secure the temperature sensitive device in the accommodating space, enabling easy installation and removal without direct embedding in the sealing body
2Ease of repair
If the temperature sensitive device is retained by a bracket, then the device can be easily maintained, but the assembly process becomes difficult
Solution Approach 1:
The bracket structure is merged with the end cover and sealing body to form an integrated accommodating space, eliminating separate bracket installation steps while maintaining device accessibility for maintenance
Solution Approach 2:
The accommodating space is pre-formed by the end cover and sealing body structure during assembly, so the retaining member and temperature sensitive device can be directly installed without additional bracket fabrication or attachment steps
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 design enables easy assembly and maintenance of the electric motor while preventing damage to the temperature sensitive device from resin injection pressure, offering the benefits of retrofitted motors with enhanced stability and accuracy in temperature measurement.
Implementation Method 1
a retaining member having elasticity. The temperature sensitive device is retained between the end cover and the temperature-sensitive-device support surface in a state that the retaining member is interposed between the temperature sensitive device and the end cover
Implementation Method 2
the sealing body being formed of sealant made of synthetic resin material having a heat conductive property and electrical insulation property
Data Source
AI summary
An electric motor to be easily assembled while taking the advantages of a retrofitted electric motor, excellent maintenance performance and no fear of damage in a temperature sensitive device due to resin injection pressure. The electric motor includes an electric motor shaft, a rotor, a stator, a housing, a sealing body formed of sealant to cover a coil end of the stator, a temperature sensitive device, an end cover, and a resilient retaining member. The electric motor shaft passes through the end cover. The sealing body includes a temperature-sensitive-device support surface opposed to the end cover. The temperature sensitive device is retained between the end cover and the temperature-sensitive-device support surface while the retaining member is interposed between the temperature sensitive device and the end cover.