Alternating Capacitor and Semiconductor Layout for Rotary Electric Machine
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Solution Overview
Problem
Conventional rotary electric machines experience performance deterioration due to increased voltage variation and inductance caused by uneven spacing between capacitors and power semiconductor components, leading to larger device sizes and ripple variations.
Innovation Solution
The rotary electric machine design alternately positions power semiconductor components and capacitors on a plane perpendicular to the rotary shaft within a metal casing, reducing the size of the power supply unit while minimizing voltage variation by equalizing wiring distances and inductance values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the capacitor is disposed in a single uncorrelated location with respect to the power semiconductor components, then the device size can be reduced, but the wiring distance increases leading to increased inductance and voltage variation
Solution Approach 1:
The capacitor is divided into multiple capacitor units (first capacitor unit and second capacitor unit) that are disposed at different locations on the heat sink. Each capacitor unit serves a specific power semiconductor component, segmenting the capacitance function across multiple locations rather than using a single centralized capacitor. This segmentation reduces wiring distances and inductance while maintaining effective voltage suppression.
Solution Approach 2:
Different capacitor units are strategically positioned at specific locations on the heat sink surface to serve specific power semiconductor components. The first capacitor unit is disposed near the first power semiconductor component and the second capacitor unit is disposed near the second power semiconductor component. This local quality approach ensures that each capacitor unit is optimally positioned to minimize wiring distance and inductance for its associated component, thereby reducing voltage variation locally where it is most needed.
Data Source
AI summary
In a rotary electric machine, a power supply unit includes a metal casing, a power circuit unit mounted in the metal casing, and a control board for controlling an operation of the power circuit unit, and supplies power to a motor main body. The power circuit unit includes a plurality of power semiconductor components and a capacitor unit. The plurality of power semiconductor components and the capacitor unit are disposed alternately on a plane perpendicular to a rotary shaft of the motor main body.