Remote Power Supply Module for Motor Control Assembly
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Solution Overview
Problem
Existing electric motor control systems are large and inefficient, impeding fluid flow and increasing costs due to the need for larger, more expensive motors and transformers to handle varying line voltages, which also lead to reduced efficiency and increased maintenance.
Innovation Solution
A motor control system with a remote power supply module that converts high-voltage AC to lower-voltage DC, separate from the electric motor, allowing the inverter module to operate within the motor control assembly, reducing size and heat exposure while enabling higher-voltage input acceptance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a motor control assembly is integrated close to the electric motor, then control efficiency is improved, but the assembly size increases and impedes fluid flow
Solution Approach 1:
The motor control system is divided into separate functional modules: a power supply module that can be remotely located and an inverter module that remains integrated with the motor. This segmentation allows the control functions to be distributed, reducing the size of the integrated control assembly while maintaining control efficiency.
Solution Approach 2:
The power supply module is extracted from the integrated motor control assembly and can be located remotely. This extraction removes bulky power conversion components from the fluid flow path, reducing the volume of the motor control assembly that is integrated with the motor while preserving all control functions.
2Adaptability or versatility
If transformers are used to step-down line voltage, then compatibility with different voltages is achieved, but cost and size increase
Solution Approach 1:
The patent replaces traditional mechanical/electromagnetic transformers with an electronic power supply module that uses semiconductor switching and electronic conversion to step-down line voltage. This electronic approach achieves the same voltage compatibility function with reduced size, weight, and improved efficiency.
Solution Approach 2:
The power supply module dynamically adjusts electrical parameters (voltage, current, frequency) through electronic switching and control to accommodate different line voltages. This parameter-based adaptation replaces fixed-ratio transformers, providing voltage compatibility without the size and cost penalties of traditional transformer solutions.
3Productivity
If motor control assembly size is reduced, then fluid flow efficiency is improved, but heat management becomes more challenging
Solution Approach 1:
Heat-generating power conversion components are extracted from the integrated motor control assembly and placed in a remotely located power supply module. This extraction removes the primary heat sources from the compact motor assembly, allowing the reduced-size control assembly to maintain efficient fluid flow while avoiding overheating issues.
Solution Approach 2:
A DC link serves as an intermediary between the remotely located power supply module and the integrated inverter module. This DC link allows power to be transmitted from the remote power supply (where heat management is easier) to the motor control assembly (where space is limited), enabling heat-generating components to be separated from the compact motor assembly while maintaining functional integration.
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 solution reduces the size and cost of motor control assemblies, eliminates the need for transformers, improves efficiency by minimizing airflow impedance, and lowers maintenance costs through modular packaging and separate replacement of power supply and inverter modules.
Implementation Method 1
a power supply module disposed external to the electric motor and configured to convert an alternating current (AC) voltage at a first level to a direct current (DC) voltage at a second level lower than a DC-equivalent voltage of the AC voltage at the first level
Implementation Method 2
The inverter module is configured to convert the DC voltage at the second level to an AC motor voltage to operate the electric motor
Data Source
AI summary
A motor control system for operating an electric motor is described. The motor control system includes a power supply module disposed external to the electric motor and configured to convert an alternating current (AC) voltage at a first level to a direct current (DC) voltage at a second level lower than a DC-equivalent voltage of the AC voltage at the first level, and a motor control assembly coupled to the electric motor. The motor control assembly includes an input power connector configured to receive the DC voltage at the second level from the power supply module. The motor control assembly also includes an inverter module coupled to the input power connector. The inverter module is configured to convert the DC voltage at the second level to an AC motor voltage to operate the electric motor.