Linear Compressor Magnetic Levitation Bearing Friction Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional linear compressors suffer from high frictional power loss and reduced mechanical efficiency due to unbalanced rotation mass and lateral forces on the piston, leading to inefficiencies compared to rotary compressors.
Innovation Solution
A linear compressor design incorporating a magnetic levitation bearing and resonant spring to minimize mechanical friction and optimize piston movement, featuring a linear motor stator, magnetic levitation bearing, and resonant spring connected to the mover rod and protrusion, allowing for frictionless operation and reduced driving force requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the piston is rigidly connected with the mover, then the structure is simple, but the piston cannot be ensured to be located at the center of the stator, generating large lateral force to the cylinder, thereby increasing frictional power loss and decreasing mechanical efficiency
Solution Approach 1:
A magnetic bearing is introduced as an intermediary component between the mover and the stator. The magnetic bearing uses magnetic fields to levitate and position the mover, ensuring the piston remains centered in the cylinder without mechanical contact. This mediator resolves the contradiction by maintaining structural simplicity while eliminating lateral forces and frictional losses.
Solution Approach 2:
The patent replaces mechanical connection and positioning systems with a magnetic field-based positioning system. Instead of using mechanical guides or bearings that would increase complexity, the magnetic bearing uses electromagnetic forces to achieve precise positioning and centering of the piston, thereby reducing frictional power loss while keeping the structure relatively simple.
2Device complexity
If the piston is rigidly connected with the mover, then the structure is simple, but the lateral force generated by the piston increases frictional power loss, thereby decreasing mechanical efficiency
Solution Approach 1:
The magnetic bearing acts as a mediator that eliminates direct mechanical contact between the mover and stator. By using magnetic fields for positioning and support, it prevents lateral forces from being transmitted to the cylinder, thereby improving mechanical efficiency without significantly complicating the overall structure.
Solution Approach 2:
The patent changes the fundamental parameter of connection from rigid mechanical connection to magnetic field-based connection. This parameter change allows the system to maintain structural simplicity while dramatically improving mechanical efficiency by eliminating friction and lateral forces through non-contact magnetic support.
3Device complexity
If conventional mechanical bearings are used, then the structure is simple, but direct contact between moving parts generates mechanical friction and power loss
Solution Approach 1:
The patent replaces conventional mechanical bearings with a magnetic bearing system. This substitution eliminates direct mechanical contact between moving parts, thereby eliminating mechanical friction and the associated power losses, while the overall structural complexity remains manageable due to the integration of the magnetic field generation into the existing motor structure.
Solution Approach 2:
The magnetic field serves as an intermediary that replaces physical mechanical contact. The magnetic bearing uses electromagnetic forces to provide support and positioning without direct contact, thereby eliminating frictional power loss while maintaining a relatively simple integrated structure.
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 significantly reduces frictional power loss and enhances mechanical efficiency, approaching theoretical maximum efficiency without direct contact between moving parts, thus improving the compressor's operational performance.
Implementation Method 1
a magnetic levitation bearing disposed on the cavity wall of the mounting cavity... the magnetic levitation bearing is configured to provide a radial magnetic levitation force to the rotor
Implementation Method 2
a resonant spring, two ends of which are respectively connected with the mover rod and the protrusion, and the resonant spring can resonate with the mover
Implementation Method 3
the linear motor stator acts with the magnetic member to push the rotor, driving the piston to move in an axial direction
Data Source
AI summary
Provided is a linear compressor comprising a cylinder, a piston, a cylinder shell, a linear motor stator, a magnetic levitation bearing and a mover. One end of the cylinder shell is sleeved on the cylinder, and another end of the cylinder shell is provided with a mounting cavity communicating with the cylinder cavity. A cavity wall of the mounting cavity is respectively provided with a stator mounting groove and a protrusion in a circumferential direction thereof. The linear motor stator is mounted in the stator mounting groove. The magnetic levitation bearing is disposed on the cavity wall of the mounting cavity. The mover includes a mover rod and a magnetic member disposed on the mover rod, and the mover rod is connected with the piston. The use of magnetic levitation bearing can avoid mechanical friction caused by direct contact of the mover with the linear motor stator.