Electromagnetic Pump Overheat Detection via Stator Core Monitoring
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Solution Overview
Problem
Conventional pumps equipped with overheat detection elements face challenges in reliably detecting abnormal overheating of coils, especially when multiple coils are present, due to unstable contact states and the need for multiple detection elements.
Innovation Solution
A pump design where a single overheat detection element is disposed on the stator core, which can detect abnormal overheating of multiple coils by monitoring the temperature of the stator core, and is held in a stable contact state using an elastic retaining member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple overheat detection elements are provided (one for each coil), then the reliability of overheating detection is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
Multiple overheat detection elements are merged into a single integrated detection element that contacts the stator core. This single element can detect temperature rises caused by any of the multiple coils, thereby reducing device complexity while maintaining detection reliability through the common thermal pathway of the stator core.
Solution Approach 2:
The stator core serves as a universal thermal conduction path that distributes heat from multiple coils to a single detection point. The single overheat detection element on the stator core performs the function of monitoring all coils simultaneously, making the detection system multi-functional without requiring multiple separate elements.
2Speed
If the overheat detection element is attached directly to the coil, then the detection responsiveness is improved, but the contact stability deteriorates due to the uneven coil surface
Solution Approach 1:
The stator core acts as an intermediary between the coils and the overheat detection element. Heat from the coils is conducted through the stator core to the detection element, providing stable thermal contact while maintaining fast detection response. The stator core's flat surface ensures stable mechanical contact with the detection element.
3Stability of the object's composition
If resin filling is used to stabilize the contact between detection element and coil, then the contact stability is improved, but the manufacturing complexity increases
Solution Approach 1:
The detection element is extracted from direct contact with the uneven coil surface and repositioned on the flat stator core surface. This eliminates the need for resin filling or other complex manufacturing steps to achieve stable contact, as the flat stator core provides inherent contact stability.
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 allows for reliable detection of abnormal overheating in multiple coils with a single overheat detection element, ensuring stable contact and rapid detection of overheating issues.
Implementation Method 1
an electromagnet having a stator core and a coil wound around the stator core, and configured to reciprocate the reciprocating pumping member by electromagnetic force
Implementation Method 2
the electromagnet heats up due to the flow of electric current through the coils
Implementation Method 3
an overheat detection element disposed on the stator core... when the overheat detection element detects that the stator core has heated up above a predetermined temperature
Data Source
AI summary
The pump has an electromagnet for reciprocating a piston, and a first casing member at least partially accommodating the piston and the electromagnet. The electromagnet has a stator core and coils wound around the stator core. The pump further includes a thermal protector disposed on the stator core. The thermal protector is held between the casing member and the stator core. When the thermal protector detects that the stator core has heated up above a predetermined temperature, the supply of electric power to the electromagnet is interrupted to stop the drive of the piston.