Permanent Magnet Motor Winding Harmonic Reduction
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Solution Overview
Problem
Conventional rotary DC inverter compressors with permanent magnet motors experience harmonic magnetic potentials that lead to increased temperature rise, noise, reduced power factor, and efficiency due to low-order harmonic magnetic fields, which are challenging to optimize effectively.
Innovation Solution
A permanent magnet motor design featuring a stator winding with a combination of angular and star connections between coils, along with specific ratios of coil turns and wire diameters, to reduce copper and harmonic losses, and improve magnetic potential balance, thereby reducing motor vibration and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional single-layer cross-type or concentric winding is used, then the structure is simple, but copper loss and harmonic additional loss are high
Solution Approach 1:
The stator winding is divided into two distinct layers: a first layer winding and a second layer winding. Each layer has specific connection patterns (angular connection for first layer, star connection for second layer) that work together to reduce copper loss and harmonic additional loss while maintaining manageable structural complexity through systematic segmentation of the winding function.
2Object-affected harmful factors
If pole slot fit is determined, then the motor structure is fixed, but the lowest order radial electromagnetic force cannot be eliminated
Solution Approach 1:
The invention changes the electrical connection parameters of the windings (angular connection ratio, star connection configuration) to alter the harmonic content of the magnetic field. This modifies the radial electromagnetic force characteristics without changing the mechanical pole slot fit, thereby reducing harmful electromagnetic forces while maintaining the fixed motor structure.
3Temperature
If harmonic magnetic potential is present, then the motor can operate, but temperature rise increases and efficiency reduces
Solution Approach 1:
By adjusting the connection parameters (angular connection ratio, star connection configuration) of the two-layer winding system, the invention modifies the harmonic spectrum of the armature magnetic field. This reduces harmonic magnetic potential, thereby decreasing temperature rise and improving motor efficiency without altering the fundamental operating characteristics.
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 effectively reduces copper and harmonic losses, enhances motor efficiency, and decreases vibration and noise, improving the overall performance of the compressor.
Implementation Method 1
a stator winding, including a plurality of coupled coils, the coils are disposed in the stator slot and are wound around the stator teeth
Implementation Method 2
The low-order harmonic magnetic potential of the harmonic magnetic potential is particularly critical. These harmonic magnetic potentials synthesize rotating harmonic magnetic potentials
Implementation Method 3
permanent magnet motor
Data Source
AI summary
A permanent magnet motor and a compressor are provided. The motor has a rotor, a stator core, and a stator winding. A plurality of coupled coils are disposed on the stator core. The coil includes a first type coil and a second type coil. The stator winding is a three-phase stator winding. Each phase of the stator winding is provided with three joints In each phase, a first joint and a second joint are disposed on the first type coil, a third joint in the stator winding of each phase is disposed on the second type coil. The permanent magnet motor provided by the present disclosure can improve the efficiency of the motor and reduce noise.