Interference Suppression Module for Electric Motors
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Solution Overview
Problem
Electrically commutated electric motors require effective interference suppression to smooth voltage peaks caused by pulse-width modulation, but existing solutions like ceramic or electrolytic capacitors have low thermal stability and occupy significant space, limiting their installation and longevity.
Innovation Solution
A separate interference suppression module with a circuit carrier, electronic circuit arrangement, and encapsulation, featuring capacitors and a modular, scalable design that can be easily connected to the control unit, providing improved thermal stability and reduced space requirements, and allowing for easy replacement and protection from external influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ceramic or electrolytic capacitors are used as interference suppression components, then interference suppression is achieved, but thermal stability is low and space requirements are large
Solution Approach 1:
The patent divides the control unit into two separate modules: a control unit proper and a separate interference suppression module. This segmentation allows the interference suppression components (capacitors) to be isolated in a dedicated module with optimized space requirements and thermal management, while the control unit maintains its compact design. The separate module can be populated with larger capacitance values without compromising the overall system footprint.
Solution Approach 2:
The interference suppression module is designed as a separate three-dimensional component that can be mounted adjacent to the control unit. This dimensional separation allows the capacitors to be arranged in space-optimal configurations (including vertical stacking and multi-level arrangements) rather than being constrained to a two-dimensional PCB layout, thereby reducing the overall space footprint while accommodating larger capacitance values.
2Duration of action of stationary object
If interference suppression components are integrated in the control unit, then compact design is achieved, but thermal stability and lifetime are reduced
Solution Approach 1:
The control system is segmented into a control unit and a separate interference suppression module. This separation extends the lifetime of the interference suppression components by providing them with dedicated thermal management and optimal operating conditions, while the control unit remains compact. The modules can be independently replaced or maintained, extending system longevity.
Solution Approach 2:
The interference suppression components are extracted from the control unit and placed in a separate module. This extraction improves thermal stability and lifetime by allowing the capacitors to be mounted with optimal thermal characteristics and accessed for maintenance. The control unit itself remains unchanged, preserving its compact design while gaining the benefits of extended component lifetime.
3Reliability
If a separate interference suppression module is used, then thermal stability and space optimization are improved, but additional assembly steps are required
Solution Approach 1:
The interference suppression module is pre-populated with capacitors and other components on a dedicated PCB substrate before assembly to the control unit. This preliminary action allows for optimized component placement and thermal design in a controlled manufacturing environment, improving thermal stability. The pre-assembled module then requires only a single assembly step to integrate with the control unit, minimizing the impact on manufacturing simplicity.
Solution Approach 2:
The interference suppression module combines multiple functions into a single integrated unit: interference suppression capacitors, current sensing resistors, and signal conditioning circuits are all integrated into one module. This merging reduces the number of separate assembly steps required, as the entire interference suppression subsystem is installed in a single operation rather than multiple separate assembly steps.
Data Source
AI summary
An interference suppression module for an electrically commutated electric motor has the following components: a circuit carrier, an electronic circuit arrangement, which is arranged on the circuit carrier, an encapsulation, which surrounds the electronic circuit arrangement in a form-fitting and material-bonding manner, and at least one interface, which is provided for the purpose of electrical contact-connection of the electronic circuit arrangement to a control unit of the electrically commutated electric motor. The specification details an interference suppression module, a method for producing an interference suppression module, and a vehicle equipped with an interference suppression module.