Motor, compressor, and refrigeration device
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Solution Overview
Problem
Single-cylinder rolling rotor compressors experience significant speed fluctuations and reduced energy efficiency due to poor resistance against disturbances during low-frequency operations, primarily due to their small inner rotor diameter and pulsatile load.
Innovation Solution
A motor design with a stator core having an inner-to-outer diameter ratio greater than 0.5, a rotor with a magnetic member, and optimized dimensions to increase the rotor's outer radius, enhancing resistance and energy efficiency while maintaining miniaturization, using a rare earth permanent magnet synchronous motor with concentrated winding and specific tooth slot configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inner diameter of the rotor is increased to improve resistance against disturbance, then the resistance and energy efficiency are improved, but the motor volume increases
Solution Approach 1:
The patent applies parameter changes by optimizing the ratio of inner diameter to outer diameter of the stator core (k>0.5) and the relationship between exhaust volume, rotor mass, and rotor radius (V/(M*R^2)*1000 ≥ 2.22). These parameter optimizations allow the rotor to achieve sufficient moment of inertia for resistance against disturbance while controlling the overall motor volume through efficient spatial utilization.
Solution Approach 2:
The patent employs dynamics by using a permanent magnet synchronous motor with optimized rotor inertia characteristics. The dynamic performance is enhanced through the relationship V/(M*R^2)*1000 ≥ 2.22, which balances the rotor's resistance against disturbance with the motor's compact size, allowing the system to adapt to varying load conditions while maintaining compact dimensions.
2Reliability
If the rotor mass is increased to improve resistance against disturbance, then the resistance and energy efficiency are improved, but the motor weight increases
Solution Approach 1:
The patent applies parameter changes by optimizing the relationship between exhaust volume, rotor mass, and rotor radius (V/(M*R^2)*1000 ≥ 2.22). This parameter optimization allows the rotor to achieve sufficient moment of inertia for resistance against disturbance while controlling the overall motor weight through efficient spatial utilization and material distribution.
Solution Approach 2:
The patent uses composite materials by combining the rotor core with magnetic members (permanent magnets) to create a composite rotor structure. This composite construction enhances the magnetic field strength and moment of inertia without proportionally increasing the weight, as the magnetic members provide functional properties while the rotor core provides structural support and mass.
3Reliability
If the stator core inner diameter is increased to accommodate a larger rotor, then the rotor resistance is improved, but the motor volume increases
Solution Approach 1:
The patent applies parameter changes by optimizing the ratio of inner diameter to outer diameter of the stator core (k>0.5). This parameter optimization allows the stator core to provide sufficient inner diameter for an enlarged rotor while controlling the overall motor volume by efficiently utilizing the space between the stator and rotor, achieving a balance between rotor size and compact motor dimensions.
Solution Approach 2:
The patent employs dynamics by using a permanent magnet synchronous motor with optimized spatial configuration. The dynamic performance is enhanced through the stator core ratio optimization (k>0.5), which allows the rotor to have sufficient diameter for resistance against disturbance while the motor maintains compact dimensions through efficient spatial arrangement of magnetic circuits and windings.
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 solution reduces speed fluctuations, improves operational stability, increases energy efficiency, and decreases compressor noise, ensuring effective performance in low-frequency operations while maintaining motor miniaturization.
Implementation Method 1
a motor for a compressor, comprising: a stator (2) comprising a stator core (22) in a circular tubular shape
Implementation Method 2
a rotor (4) provided in a cylindrical space formed by the stator core (22) and comprising a rotor core (42) and a magnetic member (44) provided on the rotor core (42)
Data Source
AI summary
A motor and a compressor having the motor are provided. The motor has a stator and a rotor. The stator has a circular tubular stator core having an inner diameter and an outer diameter. The ratio k of the inner diameter to the outer diameter satisfies k>0.5. The rotor is provided in the cylindrical space formed by the stator core and has a rotor core and a magnetic member provided on the rotor core. The exhaust volume V of the compressor, the mass M of the rotor core and the magnetic member, and the maximum radius of an outer edge of the rotor satisfy 2<V/(M*R2)*1000<4. The motor reduces speed fluctuation while ensuring motor miniaturization, effectively improves the operational stability of the compressor in the low-frequency operation process of the compressor, increases the machine efficiency of the compressor, and reduces the compressor noise.