Trapezoidal Inverter Module Annular Arrangement
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Solution Overview
Problem
Existing inverter-integrated motor designs require significant space for wire routing and connection work due to concentrated electrical connections near the motor shaft center, leading to upsizing of the inverter module.
Innovation Solution
The inverter module is configured with trapezoidal power modules arranged in an annular pattern, where motor connection terminals are on the outer periphery and power supply terminals are on the inner side, minimizing wiring length and separating connection workspaces, and optimizing the placement of switching elements and control signal terminals to reduce parasitic inductance and heat dissipation area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrical connection terminals are concentrated near the motor shaft center, then connection work is simplified, but space for wire routing and connection work increases
Solution Approach 1:
The inverter module is divided into multiple power modules (first, second, third, and fourth power modules) arranged in an annular pattern. Each power module has its own electrical connection terminals positioned at different locations (outer peripheral side for motor connections, inner peripheral side for power supply connections), distributing the connection work across multiple separated locations rather than concentrating all connections at a single point.
Solution Approach 2:
The electrical connection terminals are arranged in an annular pattern around the motor shaft, utilizing the radial dimension. Motor connection terminals are positioned on the outer peripheral side while power supply connection terminals are positioned on the inner peripheral side, creating a radial distribution that eliminates the need for wire routing through the motor shaft center region.
2Ease of operation
If wire routing space is provided near the motor shaft center, then electrical connection is enabled, but inverter module size increases
Solution Approach 1:
The wire routing function is extracted from the motor shaft center region. Instead of routing wires through the center, the power modules are positioned with their terminals facing the outer periphery, and wires are routed from the outer peripheral side directly to the motor terminals, eliminating the need for central wire routing space.
Solution Approach 2:
The connection architecture transitions from a centralized radial connection (through the motor shaft center) to a distributed annular connection pattern. The power modules are arranged in an annular pattern with terminals positioned on the outer periphery, allowing wire routing to occur in the radial direction from outer to outer, bypassing the need for central routing space.
Data Source
AI summary
Provided is an inverter module for use in an inverter-integrated motor, the inverter module being arranged at an axial end portion of a motor, the inverter module including trapezoidal power modules, each of which has a single-phase inverter circuit mounted thereon, and includes an electrical connection terminal for a power supply arranged on a short side thereof and an electrical connection terminal for the motor arranged on a long side thereof. A plurality of the trapezoidal power modules are arranged in an annular pattern so that the long side of the each of the plurality of the trapezoidal power modules faces toward an outer periphery, to thereby construct a polyphase inverter circuit.