Multi-phase Wheel Motor with Isolated Stator Sections
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Solution Overview
Problem
Traditional brushless electrical motors with magnetically isolated stator sections experience high cogging torque, leading to undesirable motor vibrations, which existing configurations have not adequately addressed.
Innovation Solution
A rotary multi-phase electrical motor design with magnetically isolated stator sections, where the number of stator teeth on each section is an odd number of at least three, and the difference between the total number of stator teeth and rotor permanent magnets is one, minimizing cogging torque by optimizing the angular distance between teeth and magnets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If magnetically isolated stator sections are used, then manufacturing and maintenance become easier, but cogging torque increases causing undesirable vibrations
Solution Approach 1:
The stator is divided into multiple magnetically isolated sections, each carrying coils driven by the same phase. This segmentation isolates the magnetic circuit of each phase, reducing mutual inductance while the specific tooth configuration minimizes cogging torque
Solution Approach 2:
The patent applies specific parameter relationships: the number of stator teeth per section is an odd number of at least three, and the difference between total stator teeth and rotor permanent magnets is exactly one. These parameter changes optimize the angular distance between teeth and magnets to minimize cogging torque while maintaining the benefits of magnetically isolated sections
2Device complexity
If the number of stator teeth and rotor permanent magnets follows traditional configurations, then motor construction is simpler, but cogging torque magnitude is high causing undesirable vibrations
Solution Approach 1:
The patent changes the parameters of stator teeth and rotor permanent magnets configuration. Specifically, the number of stator teeth per section is an odd number of at least three, and the difference between total stator teeth and rotor permanent magnets is one. This optimized configuration minimizes cogging torque while maintaining relatively simple motor construction
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 significantly reduces cogging torque, enhancing motor stability and reducing undesirable vibrations, while allowing for easier manufacturing and maintenance due to separate phase sections.
Implementation Method 1
a stator (50) comprising a plurality of stator sections (52) arranged to create an annular stator (50), each stator section (52) being magnetically isolated from the other stator sections (52) by a non-magnetic material (65) so as to create magnetically isolated magnetic circuits; wherein two stator teeth (54), the coiled teeth (76), of each stator section (52) each holds one copper wire coil (68)
Implementation Method 2
a rotor (51) surrounding said stator (50) and comprising permanent magnet poles (58) alternately polarized and equidistantly arranged; wherein the array of teeth (54) faces the array of magnets (58) with a constant air-gap
Implementation Method 3
each section holding only one phase; Two stator teeth (54), the coiled teeth (76), of each stator section (52) each holds one copper wire coil (68)
Data Source
AI summary
The invention relates to a rotary multi-phase electrical motor wherein stator teeth corresponding to one same phase are grouped on a distinct and magnetically isolated stator section. The number of teeth per stator section is an odd number of a value of at least three and the difference between the total number of stator teeth and the number of rotor permanent magnet poles is one. The teeth are preferably equidistantly distributed along the stator. The invention also relates to a wheel motor using the rotary multi-phase electrical motor described above.