Motor Control Apparatus Regeneration Threshold Adjustment
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Solution Overview
Problem
Existing motor control apparatuses face challenges in accurately determining motor abnormalities during regeneration operations, leading to potential incorrect determinations due to counterelectromotive forces and overshooting currents, which can result in misidentification of normal or abnormal states.
Innovation Solution
A motor control apparatus with a regeneration operation determination section that adjusts the determination threshold during regeneration operations, distinguishing it from power running operations, and using feedback control to align detected and command currents, thereby preventing incorrect abnormality determinations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed determination threshold is used for abnormality detection, then the motor control apparatus can protect circuit elements during power running operation, but it may cause incorrect abnormality determination during regeneration operation due to current overshooting
Solution Approach 1:
The determination threshold is changed from a fixed value to a dynamic value that adapts to different operation modes. The controller dynamically adjusts the threshold based on whether the motor is in power running mode or regeneration mode, ensuring accurate abnormality detection in both scenarios without false alarms
Solution Approach 2:
The patent changes the parameter of determination threshold based on operation mode. During power running operation, a first determination threshold is used, while during regeneration operation, a second determination threshold (different from the first) is applied. This parameter adaptation resolves the contradiction between reliable detection and operational versatility
2Reliability
If the determination threshold is increased to prevent false alarms during regeneration, then incorrect determinations are reduced, but the sensitivity to detect actual abnormalities during power running operation decreases
Solution Approach 1:
The patent applies different determination threshold parameters for different operation modes. A higher threshold can be used during regeneration to prevent false alarms, while a lower, more sensitive threshold is used during power running to detect actual abnormalities. This resolves the contradiction by making the threshold parameter adaptive rather than fixed
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 effectively protects circuit elements by accurately differentiating between normal and abnormal states during regeneration, preventing false alarms and ensuring reliable operation by setting a higher determination threshold during regeneration, thus preventing incorrect determinations.
Implementation Method 1
when the motor of the permanent magnetic field type performs power running, a counterelectromotive force is generated in a direction to reduce the motor current
Implementation Method 2
a counterelectromotive force is generated in a direction to increase the motor current, for example, when the motor performs a regeneration operation
Data Source
AI summary
A motor control apparatus can protect circuit elements in an appropriate manner while preventing an incorrect abnormality determination when a motor is in regeneration operation, etc. The apparatus includes a target current calculation section (51), a drive control section (52) that generates a drive signal based on a current deviation ΔI between a target current (IMT) and a detected current (IMS), an abnormality determination section (53) that generates an abnormality determination signal based on the target current (IMT) and the detected current (IMS), and a regeneration operation determination section (59) that determines whether the motor (4) is in a regeneration operation state. When it is determined that the motor (4) is in a regeneration operation, a determination threshold of the abnormality determination section (53) is set to a value larger than a determination threshold during power running operation.