Multiphase Fractional Slot Winding with End-Mounted Series Converter
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Solution Overview
Problem
Existing multiphase electric machines, such as induction and fractional slot permanent magnet machines, require separate dedicated cooling and converters, leading to increased cost and complexity due to the need for high-voltage components and separate installation, which complicates the variable speed drive system.
Innovation Solution
A multiphase fractional slot concentrated winding machine with an integrated or detachable end-mounted multiphase series converter circuit, where each stator tooth is individually wound with a coil, particularly using aluminum material, and a converter module is connectable to the machine module, allowing for multiphase operation with phase group converter circuits connected in series across the power supply voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If converters are installed in separate locations from the machine, then ingress protection is achieved, but installation complexity and system cost increase
Solution Approach 1:
The patent integrates the converter circuit directly into the motor assembly, combining two previously separate components (motor and converter) into a single unified device. This eliminates the need for separate installation locations while maintaining protection through the integrated housing structure.
2Temperature
If converters are installed in separate locations, then cooling requirements are met, but cost and complexity increase due to additional installation requirements
Solution Approach 1:
The converter circuit is integrated within the motor housing, allowing the motor's existing cooling system to serve both the motor and converter components. This eliminates the need for separate cooling infrastructure while managing thermal loads from both components.
3Power
If high voltage components are used to handle the entire supply voltage, then the machine can operate at high voltage, but component cost increases
Solution Approach 1:
The converter circuit divides the high supply voltage into multiple lower voltage segments, with each switching element handling only a portion of the total voltage. This segmentation allows the use of lower voltage, lower cost components while maintaining high voltage operational capability through series connection of multiple switching elements.
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 design reduces the cost and complexity of the motor and drive system by eliminating the need for separate cooling and high-voltage components, achieving a potential cost savings of up to 25% and improving efficiency, while also simplifying maintenance and reducing iron and rotor back iron losses.
Implementation Method 1
phase group converter circuits that drive coils in a phase group with a common phase and that are connectable in series across a power supply voltage to divide the power supply voltage
Implementation Method 2
Each tooth is individually wound with a coil, particularly using aluminum material
Implementation Method 3
The converter module includes a multiphase series converter circuit to energize the coils for multiphase operation
Data Source
AI summary
The subject matter described herein includes a multiphase fractional slot concentrated winding machine. One such machine includes a machine module including a rotor and a stator. The stator includes a plurality of radially extending teeth. Each tooth is individually wound with a coil. The machine further includes a multiphase series converter circuit physically connected to an end of the machine module to energize the coils for multiphase operation.