Motor Drive Power Converter With Set Value Validation
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Solution Overview
Problem
Existing electrical power converters fail to ensure stable motor drive when inappropriate set values, such as electrical power converter specifications or electric motor constants, are used, leading to potential overcurrent and damage.
Innovation Solution
The electrical power converter includes a set value determining section that assesses and adjusts electric motor specification and constant values using predefined relationships and conversion methods to ensure appropriate settings, employing vector control and other methods to stabilize motor operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a three-phase to single-phase converter is constructed using a conventional bridge circuit, then the converter can perform power conversion, but the circuit requires many switching devices and control circuits making the structure complex
Solution Approach 1:
The three-phase to single-phase converter is divided into two separate two-phase to single-phase converter circuits. Each converter handles a specific phase combination (first converter: U and V phases, second converter: V and W phases), reducing the complexity of individual circuits while maintaining overall three-phase to single-phase conversion capability.
Solution Approach 2:
The two separate two-phase to single-phase converter circuits are combined in parallel to achieve three-phase to single-phase power conversion. The output terminals of both converters are connected to common output lines, merging their capabilities to handle the full three-phase input while simplifying individual circuit designs.
2Power
If the converter uses a bridge circuit with many switching devices, then power conversion can be achieved, but the switching devices and control circuits become numerous increasing device complexity
Solution Approach 1:
The power conversion function is segmented across two independent converter circuits, each with fewer switching devices than a full three-phase bridge. This segmentation reduces the number of switching devices required in each individual circuit while collectively achieving three-phase to single-phase conversion.
Solution Approach 2:
Each two-phase to single-phase converter circuit is designed to handle multiple phase combinations. The first converter processes U and V phases, while the second handles V and W phases, with both circuits capable of operating independently or in combination to provide flexible power conversion with reduced component counts.
3Adaptability or versatility
If the converter is designed to handle unbalanced loads, then versatility is improved, but the circuit structure becomes more complex requiring additional switching devices
Solution Approach 1:
The converter system is segmented into two independent two-phase to single-phase converter circuits, each capable of handling unbalanced loads from their respective phase combinations. This segmentation allows each circuit to independently manage load imbalances without requiring complex coordination, achieving versatile unbalanced load handling through simple parallel operation.
Solution Approach 2:
The converter system adapts to unbalanced load conditions by dynamically utilizing different phase combinations through the two parallel circuits. When load imbalance occurs, the system can adjust the contribution of each converter circuit based on the specific phase load conditions, providing versatility through parameter adaptation rather than structural complexity.
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
Ensures stable motor drive even with inappropriate set values by dynamically adjusting settings, preventing overcurrent and protecting the converter and motor.
Implementation Method 1
an inverter for converting direct current to alternating current
Data Source
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Figure 5~6
AI summary
Provided is an electrical power converter that can realize stable driving of an electric motor even if the specification value of the electrical power converter, the specification value of the electric motor, or the electric motor constant is set to an inappropriate value. An electrical power converter performing drive control of an electric motor by converting alternating current or direct current voltage to a desired voltage, wherein the electrical power conversion device is characterized in determining whether or not at least one item of data from among the data of the values set as the electric motor constant satisfies a maximum value or a minimum value set on the basis of at least one item of data from among the data of the specification values set for the electric motor.