10-Pole 9-Slot Synchronous Motor Stator Teeth Tip Design
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Solution Overview
Problem
Conventional synchronous motors with a 2:3 ratio of rotor poles to stator slots experience cogging torque, vibration, and noise due to uneven magnetic flux distribution, and a large excitation force in the radial direction, which increases vibration and noise further.
Innovation Solution
A 10-pole/9-slot synchronous motor design is implemented, where the stator iron core is configured such that the ratio of the thickness of the teeth tip to its width is greater than 0.5, reducing the excitation force and enhancing torque output while minimizing vibration and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If three-phase windings are continuously and intensively positioned in the stator, then the magnetic flux interlinkage is improved, but a large excitation force is generated in the radial direction causing vibration and noise
Solution Approach 1:
The patent applies local quality by making the teeth tip thickness non-uniform, specifically setting it to 0.4mm at certain positions and 0.6mm at other positions around the stator circumference. This local variation in thickness creates corresponding variations in magnetic flux density distribution, which balances the excitation force in the radial direction while maintaining effective magnetic flux interlinkage between the rotor and stator.
2Strength
If the teeth tip thickness is increased, then the structural strength is improved, but the magnetic flux distribution becomes uneven increasing cogging torque
Solution Approach 1:
The patent resolves this contradiction by implementing local quality through non-uniform teeth tip thickness. Different sections of the stator have different teeth tip thicknesses (0.4mm and 0.6mm), which locally compensates for magnetic flux distribution imbalances. This maintains adequate structural strength in each local region while the overall non-uniform pattern balances the total excitation force, reducing cogging torque.
Solution Approach 2:
The patent applies asymmetry by deliberately creating an asymmetric teeth tip thickness distribution around the stator circumference. This asymmetric configuration is designed to balance the magnetic flux density distribution and excitation force vectors, reducing the net radial excitation force and cogging torque while maintaining sufficient local structural strength.
3Power
If openings are provided between adjacent teeth, then magnetic flux interlinkage is facilitated, but cogging torque is generated due to disturbed magnetic flux density distribution
Solution Approach 1:
The patent applies parameter changes by modifying the teeth tip thickness parameter to create a non-uniform distribution pattern. This parameter variation compensates for the magnetic flux density disturbances caused by the openings between teeth, balancing the overall flux distribution and reducing cogging torque while preserving the beneficial magnetic flux interlinkage provided by the openings.
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 design effectively reduces vibration and noise while maintaining high torque output by optimizing the stator iron core configuration, resulting in a more balanced magnetic field and reduced excitation force.
Implementation Method 1
a synchronous motor using a permanent magnet, particularly as for a motor in which stator windings are wound intensively around teeth
Implementation Method 2
an attracting and repelling force between the permanent magnet of the rotor and the stator becomes unbalanced with respect to the rotary shaft
Implementation Method 3
a stator iron core is configured such that a value obtained by dividing b by a is larger than 0.5 where the a is a width of a teeth tip... and the b is a thickness of the teeth tip
Data Source
AI summary
A 10-pole/9-slot synchronous motor includes nine teeth that are divided into three phases, each having three adjacent teeth. A stator iron core is configured such that a value obtained by dividing b by a is larger than 0.5 where the a is a width of a teeth tip, which is provided on an inner diameter side of a tooth of the teeth formed on the stator iron core, from a base portion between the teeth tip and the tooth to a circumferential end of the teeth tip and the b is a thickness of the teeth tip from the base portion to an inner-diameter side surface of the teeth tip.