Motor Stator Pseudo-Teeth Layout for Cogging Torque and Vibration
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Solution Overview
Problem
Existing motor designs face challenges in achieving desired cogging-torque characteristics while maintaining high torque levels, as they often compromise on vibration and resonance suppression.
Innovation Solution
The motor configuration includes a stator with a stator core and coils, a rotor with magnets arranged radially, and pseudo-teeth made of magnetic material located between teeth in the stator core, allowing for concentrated pseudo-teeth arrangement to optimize cogging-torque characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If non-winding magnetic poles are provided in the stator, then vibration and resonance are suppressed, but cogging-torque characteristics deteriorate
Solution Approach 1:
The stator magnetic poles are segmented into two distinct types: winding magnetic poles (with coils) and non-winding magnetic poles (without coils). This segmentation allows the non-winding poles to suppress vibration and resonance while the winding poles generate the necessary cogging torque, resolving the contradiction between vibration suppression and cogging-torque characteristics.
Solution Approach 2:
Different regions of the stator are given different properties: winding magnetic poles have coils for generating strong magnetic fields and cogging torque, while non-winding magnetic poles have no coils for suppressing vibration and resonance. This local differentiation allows each region to optimize its function, achieving both vibration suppression and desired cogging-torque characteristics simultaneously.
2Object-affected harmful factors
If the number of magnetic poles is increased to suppress vibration, then vibration suppression improves, but device complexity increases
Solution Approach 1:
The coil windings are extracted only from specific magnetic poles (winding magnetic poles) rather than being installed in all magnetic poles. This extraction reduces the overall complexity of the stator structure while maintaining the necessary functions: winding poles provide cogging torque and non-winding poles provide vibration suppression.
Solution Approach 2:
The stator structure achieves multiple functions through the alternating arrangement of winding and non-winding magnetic poles: vibration suppression, cogging torque generation, and magnetic field generation. This multi-functionality is achieved without increasing device complexity, as the same basic magnetic pole structure serves different purposes depending on whether it has coils or not.
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 enables the achievement of desired cogging-torque characteristics while maintaining high torque levels, suppressing vibration and resonance, and reducing the number of motor parts, thus enhancing overall motor performance.
Implementation Method 1
the rotor being configured to rotate upon supply of electric current to the coils
Implementation Method 2
a plurality of pseudo-teeth formed of a magnetic material
Data Source
AI summary
A motor includes a stator that includes a stator core and coils. The stator core is formed of a magnetic material and has a plurality of teeth arranged at intervals in a circumferential direction. The coils are formed of electrically-conductive windings wound around the teeth. Moreover, the motor also includes a rotor having a plurality of magnets arranged in radial opposition to the stator core and at intervals in the circumferential direction. The rotor is configured to rotate upon supply of electric current to the coils. Furthermore, the motor also includes a plurality of pseudo-teeth formed of a magnetic material and each located in a circumferentially intermediate area between a circumferentially-adjacent pair of the teeth. The pseudo-teeth are arranged so as to be concentrated in a part of the stator core in the circumferential direction.