Motor of compressor and refrigeration cycle apparatus
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Solution Overview
Problem
Conventional motors for compressors face inefficiencies due to low magnetic permeability in stainless steel magnetic tubes, leading to reduced demagnetization resistance and output, especially under varying compression torque conditions.
Innovation Solution
A compressor motor design featuring a stator core with aluminum winding wire wound in a concentrated manner around teeth, a rotor core with ferrite magnets, and a specific stator core shape that satisfies the relation 0.3<S×A÷L<2.2, enhancing demagnetization resistance while minimizing efficiency reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic tube made of stainless steel is used to prevent demagnetization, then demagnetization resistance is improved, but magnetic permeability is low which reduces motor efficiency
Solution Approach 1:
The patent changes the material parameter from stainless steel to ferrite magnets, which have different magnetic permeability characteristics. Ferrite magnets provide adequate demagnetization resistance while allowing for better magnetic circuit design that reduces energy losses in the motor.
Solution Approach 2:
The patent uses composite construction with ferrite magnets combined with specific stator core geometries. This composite approach allows the system to achieve both demagnetization protection and efficient magnetic flux transmission, resolving the contradiction between reliability and energy efficiency.
2Power
If compression torque is maximized for high power output, then motor power is improved, but peak current increases causing demagnetization
Solution Approach 1:
The patent applies preliminary anti-action by pre-configuring ferrite magnets with inherent resistance to demagnetization. This preliminary protection allows the motor to handle peak compression torque and peak currents without suffering demagnetization, enabling high power output while maintaining reliability.
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 improves demagnetization resistance while maintaining motor efficiency by effectively transmitting heat to ferrite magnets, increasing coercive force and reducing copper losses.
Implementation Method 1
effectively transmitting heat to ferrite magnets, increasing coercive force
Implementation Method 2
a plurality of ferrite magnets inserted into the magnet insertion holes
Data Source
AI summary
A compressor includes: a stator core including a plurality of teeth around which an aluminum winding wire is wound in a concentrated manner; a rotor core disposed on an inner diameter side of the stator core and including a plurality of magnet insertion holes; and a plurality of ferrite magnets inserted in the magnet insertion holes, in which when a width of a winding wire portion formed in each of the teeth is represented as A, a length in an axis direction of the stator core is represented as L, and the number of slots is represented as S, the stator core has a shape that satisfies a relation of 0.3<S×A÷L<2.2.