Motor Stator Tooth Tip Layout for Cogging Torque and Winding Space
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Solution Overview
Problem
Existing motor designs face challenges in achieving desired cogging torque characteristics while avoiding hindrances to torque increase, particularly due to the presence of non-winding magnetic poles which narrow the space for winding and potentially decrease motor torque.
Innovation Solution
The motor design incorporates a rotor with a magnet and a stator core featuring tooth main body portions and tooth tip portions, where the tooth tip portions include both uniform and varying shapes and sizes, allowing for increased cogging torque without the need for additional non-winding magnetic poles, thus maintaining space for winding and preventing torque hindrance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If non-winding magnetic poles are added to achieve desired cogging torque characteristics, then cogging torque is improved, but the space for winding is narrowed and motor torque decreases
Solution Approach 1:
The patent applies local quality by making the tooth tip portions have different shapes and sizes from each other, while the main body portions remain uniform. This localized variation in the tooth tip geometry allows for optimized cogging torque characteristics without requiring additional non-winding magnetic poles, thereby maintaining sufficient winding space and motor torque.
Solution Approach 2:
The patent employs asymmetry by configuring the tooth tip portions with different shapes and sizes, breaking the uniform symmetry of traditional motor designs. This asymmetric configuration at the tooth tips enables improved cogging torque characteristics while avoiding the need for extra non-winding magnetic poles that would reduce winding space and motor torque.
2Object-generated harmful factors
If non-winding magnetic poles are added to improve cogging torque, then cogging torque characteristics are improved, but the space factor decreases due to reduced winding space
Solution Approach 1:
The patent applies local quality by making the tooth tip portions have different shapes and sizes from each other, while the main body portions remain uniform. This localized variation in the tooth tip geometry allows for optimized cogging torque characteristics without requiring additional non-winding magnetic poles, thereby maintaining sufficient winding space and motor torque.
Solution Approach 2:
The patent employs asymmetry by configuring the tooth tip portions with different shapes and sizes, breaking the uniform symmetry of traditional motor designs. This asymmetric configuration at the tooth tips enables improved cogging torque characteristics while avoiding the need for extra non-winding magnetic poles that would reduce winding space and motor torque.
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 motor to achieve desired cogging torque characteristics while suppressing torque increase hindrances, reducing vibration and noise, and maintaining a high space factor for efficient operation.
Implementation Method 1
a rotor (12) that includes a magnet (20) and is rotatably supported; and a stator (14) that includes a stator core (23)
Implementation Method 2
a plurality of tooth main body portions (40) that are made of a magnetic material and disposed with space therebetween in a circumferential direction
Data Source
AI summary
A motor includes a rotor and a stator. The rotor includes a magnet and is rotatably supported. The stator includes a stator core that includes a plurality of tooth main body portions made of a magnetic material and disposed with space therebetween in a circumferential direction, and a plurality of tooth tip portions disposed opposing the magnet and each formed in an end portion on the rotor side of the plurality of tooth main body portions, and a plurality of coils formed around the plurality of tooth main body portions by a conductive winding being wound. In the motor, the tooth tip portions are configured to include a plurality of first tooth tip portions that have the same shape and size as one another, and one or more second tooth tip portions that are different from the first tooth tip portions in at least either of the shape and size.