Compressor Rotor Magnet Layout for Crankshaft Vibration Control
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Solution Overview
Problem
Conventional compressors in heat pump devices experience torque variation due to differences in magnetic force during refrigerant compression, leading to shaft deflection, vibration, and noise, which are not effectively addressed without balance weights that reduce effective magnetic flux.
Innovation Solution
The compressor design includes a rotor with opposed magnets arranged to create a balanced magnetic field, eliminating shaft deflection by making the magnetic forces acting on the crankshaft equal and opposite, thus balancing the force on the rotating portion without the need for balance weights, while maintaining effective magnetic flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If balance weights are arranged on the end portions of the rotor to suppress vibration and noise, then the force acting on the rotating portion is balanced, but the device complexity increases and manufacturing cost increases
Solution Approach 1:
The invention extracts and eliminates the balance weights from the rotor structure. Instead of adding balance weights to suppress vibration, the patent redesigns the magnetic field distribution so that the magnetic forces themselves balance the deflecting force, removing the need for separate balancing components and simplifying the device structure.
Solution Approach 2:
The invention replaces the mechanical balance weight system with a magnetic field-based balancing system. By controlling the distribution of magnetic forces between the stator and rotor magnets, the patent achieves force balance without mechanical additives, substituting a mechanical solution with an electromagnetic one.
2Object-affected harmful factors
If balance weights are arranged on the end portions of the rotor to suppress vibration and noise, then the force acting on the rotating portion is balanced, but the manufacturing cost increases
Solution Approach 1:
The invention extracts and eliminates the balance weights from the rotor structure. Instead of adding balance weights to suppress vibration, the patent redesigns the magnetic field distribution so that the magnetic forces themselves balance the deflecting force, removing the need for separate balancing components and simplifying the device structure.
3Device complexity
If the air gap between the stator and permanent magnets is increased to eliminate balance weights, then the device complexity is reduced, but the amount of effective magnetic flux is reduced
Solution Approach 1:
The invention changes the parameter distribution of the magnetic field rather than simply increasing the air gap uniformly. By creating an asymmetric air gap or varying the magnetic strength of opposite magnets, the patent maintains sufficient effective magnetic flux while using the magnetic force difference to balance the deflecting force, thus avoiding the energy loss that would result from a uniform air gap increase.
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 effectively balances the force on the rotating portion, suppressing vibration and noise, and allows for cost reduction and resource savings by eliminating the need for balance weights without reducing the effective magnetic flux.
Implementation Method 1
the magnets are arranged such that a difference in magnetic force between the opposed magnets eliminates a force that deflects the crankshaft when the motor is rotationally driven
Data Source
AI summary
A compressor includes: a motor that includes a rotor including opposed magnets; a compression unit that compresses a refrigerant; and a crankshaft that is connected to the motor and the compression unit and is configured to transmit rotational driving of the motor to the compression unit, wherein the magnets are arranged such that the difference in magnetic force between the opposed magnets eliminates a force that deflects the crankshaft when the motor is rotationally driven.