Motor Generator Unit Wiring and Shielding for Noise Reduction
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Solution Overview
Problem
Integrated motor/generator units in automotive vehicles face challenges with vibration resistance, water exposure, and magnetic noise interference due to the proximity of the invertor control circuit and wiring to the motor/generator, necessitating improved wiring rationalization and noise resistance.
Innovation Solution
The motor/generator unit design positions the control circuit and semiconductor control device on one side of the brushes, with a field circuit component mounting part between the field and armature windings, allowing for rationalized wiring patterns and reduced noise interference by isolating these components from the rotor and stator leakage flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the invertor control circuit and wiring are positioned close to the motor/generator for integration, then device complexity is reduced and mounting space is saved, but the circuit becomes more susceptible to magnetic noise interference and vibration
Solution Approach 1:
A magnetic shield plate is introduced as an intermediary component between the motor/generator and the control circuit. This shield plate blocks magnetic flux from reaching the control circuit and wiring, thereby eliminating magnetic noise interference while allowing the control circuit to remain integrated with the motor/generator unit.
Solution Approach 2:
The magnetic shield plate functions as a thin film barrier that selectively blocks magnetic field lines. This thin shield effectively separates the magnetic environment of the motor/generator from the sensitive control circuit, protecting against noise without adding significant bulk or complexity to the integrated design.
2Volume of moving object
If heat-producing components are mounted close to the control circuit for compactness, then device size is reduced, but the control circuit experiences temperature increases that affect reliability
Solution Approach 1:
The integrated unit is segmented into distinct thermal zones: a high-temperature zone for heat-producing components and a low-temperature zone for the control circuit. The magnetic shield plate serves as both a magnetic barrier and a thermal barrier, physically separating these zones to prevent heat transfer to the sensitive control electronics.
Solution Approach 2:
The magnetic shield plate acts as a thermal intermediary that blocks heat flow from hot components to the control circuit. This shield creates a thermal boundary that protects the control circuit from temperature increases while maintaining the compact integrated structure.
3Adaptability or versatility
If wiring connections are extended to connect remote invertor and motor/generator, then component placement flexibility is improved, but wiring complexity and vulnerability to vibration increase
Solution Approach 1:
The control circuit is merged with the motor/generator into a single integrated unit, eliminating the need for extended wiring connections. This combination reduces wiring complexity and vulnerability to vibration while maintaining placement flexibility through the integrated design that can be mounted as one assembly.
Data Source
AI summary
A motor/generator unit in which a motor/generator and an invertor part are integrated and the wiring of a field circuit part for supplying current to a winding on a rotor is rationalized. In a motor/generator unit in which a motor/generator body part having a field winding supplied with electricity via brushes and current-controlled by a semiconductor control device controlled by a control circuit part and an invertor power circuit part controlled by the control circuit part has the invertor power circuit part and the control circuit part mounted thereto, the brushes are disposed between the field winding and the armature winding on one side and the control circuit part on the other and the semiconductor control device is mounted on a control circuit mounting part on which the control circuit part is mounted.