Rotary Machine Stator Cooling Partition
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Solution Overview
Problem
Current rotary machine cooling techniques using coolants face inefficiencies in converting electric power to torque due to mechanical losses, particularly in preventing coolant from entering the air gap between the stator and rotor, which affects cooling efficiency and mechanical performance.
Innovation Solution
A rotary machine design featuring a rotor and stator with mold members covering the base parts of the coil end and partition members to separate the rotor and coil end spaces, preventing coolant entry into the air gap while allowing efficient cooling, using thermally conductive materials and optimized sealing methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a coolant is directly poured onto the coil end part to cool it, then cooling efficiency is improved, but the risk of coolant entering the air gap increases, causing mechanical loss
Solution Approach 1:
The space around the coil end part is segmented into a cooling space (where coolant flows) and a non-cooling space (air gap between stator and rotor) using the mold member and partition member. This segmentation allows coolant to contact the coil end part for cooling while being prevented from entering the air gap, thus resolving the contradiction between cooling efficiency and mechanical loss prevention
Solution Approach 2:
The mold member and partition member act as intermediary structures that guide and contain the coolant flow. These intermediaries enable the coolant to reach the coil end part effectively while blocking its path to the air gap, thus achieving both cooling efficiency and prevention of mechanical loss
2Temperature
If the stator core structure is modified to improve cooling, then cooling efficiency is improved, but device complexity increases
Solution Approach 1:
The mold member serves multiple functions: it covers the base part of the coil end part, forms the boundary of the cooling space, and works with the partition member to prevent coolant leakage. This multi-functionality reduces the need for additional separate components, thus improving cooling efficiency while limiting the increase in device complexity
Solution Approach 2:
The mold member is integrated into the stator core structure, with the partition member attached to it, creating a nested configuration. This nesting approach allows the cooling structure to be incorporated within the existing stator framework, improving cooling efficiency while minimizing structural complexity
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 enhances cooling efficiency without increasing costs or deteriorating performance, effectively reducing mechanical losses and improving the conversion of electric power to torque.
Implementation Method 1
a mold member formed at each end of the stator core, to cover a base part of the coil end part
Implementation Method 2
a partition member attached in contact with the mold member, to separate a first space in which the rotor is arranged from a second space in which the coil end part is arranged
Implementation Method 3
Cooling a rotary machine used for an electric vehicle and the like with the use of a coolant is useful to efficiently generate driving force (torque) by use of electric power
Data Source
AI summary
A rotary machine capable of carrying out efficient cooling without increasing costs or deteriorating performance is provided. A motor 1 serving as the rotary machine has a rotor 20 configured to be rotatable around a rotary shaft 10, a stator 30 having a stator core 31 arranged around the rotor 20 and a coil 32 attached to the stator core 31 so that a coil end part 32a protrudes from each end of the stator core 31, mold members 33a and 33b formed at both ends of the stator core 31, to cover base parts of the coil end parts 32a, and partition parts 42b and 43b attached in contact with the mold members 33a and 33b, to separate a space S1 in which the rotor 20 is arranged from a space S2 in which the coil end parts 32a are arranged.