Concentrated Winding Motor Pole-Teeth Configuration for Vibration Reduction
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Solution Overview
Problem
Concentrated winding motors used in electric power steering systems face issues with low-spatial order electromagnetic excitation forces causing vibration and noise, as well as machinability challenges due to current unbalance and thick armature windings.
Innovation Solution
A permanent magnet type concentrated winding motor design with specific configurations, including 18±4 magnetic poles and 18 teeth, 3-phase armature windings forming parallel circuits, and coils connected in series to reduce second-spatial order electromagnetic excitation forces, improve machinability, and minimize torque ripple.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If concentrated winding is used around stator teeth, then the motor structure is compact and easy to manufacture, but low-spatial order electromagnetic excitation forces cause vibration and noise
Solution Approach 1:
The patent applies parameter changes by optimizing the number of poles M and teeth N to specific relationships (M=(18±4)n, N=18n), and configuring the armature winding with m parallel 3-phase windings where each phase has 6n/m coils in series. This specific parameter configuration reduces low-spatial order electromagnetic excitation forces while maintaining the concentrated winding structure's manufacturing advantages
2Force
If thick armature windings are used, then the motor produces sufficient torque, but the machinability and winding space factor deteriorate
Solution Approach 1:
The patent segments the armature winding into m parallel 3-phase armature windings, where each phase winding consists of 6n/m coils connected in series. This segmentation allows the use of thinner individual windings while maintaining sufficient torque output through parallel circuit configuration, thereby improving machinability and winding space factor
3Power
If the number of poles and teeth are increased, then the motor efficiency is improved, but the complexity of winding configuration increases
Solution Approach 1:
The patent establishes a universal winding configuration formula where the number of poles M=(18±4)n, teeth N=18n, and each phase has 6n/m coils in series with m parallel 3-phase windings. This universal configuration can be scaled for different motor sizes while maintaining consistent winding patterns, thereby improving motor efficiency without proportionally increasing winding configuration complexity
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 results in a high-efficiency, compact motor with reduced vibration, noise, and improved machinability, achieving low torque ripple and efficient operation in electric power steering systems.
Implementation Method 1
a rotor has magnetic poles that are configured to have magnetized permanent magnets... an armature winding formed by the coils... a 1-phase circuit of each of the 3-phase armature windings that form the parallel circuits is configured to have a 6n/m number of coils connected in series with each other
Data Source
AI summary
In a permanent magnet type concentrated winding motor, the number of magnetic poles is M, a stator Sr has an N number of teeth T around which coils are concentratedly wound and which are circumferentially arranged at equal intervals, M is equal to (18±4)n and N is equal to 18n, an armature winding AW has an m number of parallel circuits, and a 1-phase circuit of the parallel circuits is configured to have a 6n/m number of coils connected in series with each other.