Motor Driving Apparatus Latch Circuit Control
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Solution Overview
Problem
A current control apparatus for motors fails to switch the motor current when the current command value changes without pause, causing the latch circuit to remain latched in a high state and preventing current flow.
Innovation Solution
A motor driving apparatus with a driving circuit, a current feedback circuit including a latch circuit, and a controller that releases the latch state when the driving instruction signal changes, allowing the motor current to adapt to new current command values by switching the latch circuit from a latched high state to a low state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the latch circuit latches the high state when motor current exceeds the current command value, then the current control function is achieved, but the latch circuit cannot switch from high to low state when the current command value changes without pause
Solution Approach 1:
The controller proactively switches the driving instruction signal to the second state (low state) when detecting a change in current command value, before the latch circuit can remain latched. This preliminary action prevents the latch circuit from maintaining the high state indefinitely, ensuring it releases and allowing the motor current to follow the new command value.
Solution Approach 2:
The system uses feedback from the current command value changes to control the driving instruction signal. When the current command value changes, the controller detects this change and responds by switching the driving instruction signal state, which in turn controls the latch circuit release, creating a closed-loop control mechanism that adapts to command changes.
2Stability of the object's composition
If the latch circuit remains latched at high state, then the current control is maintained, but the motor current cannot be supplied based on the switched current command value
Solution Approach 1:
The system transitions from a static latch state to a dynamic control mechanism. The driving instruction signal is dynamically switched between first and second states based on the current command value changes, allowing the latch circuit to transition between latched and released states, thereby enabling continuous adaptation to new command values while maintaining operational stability.
3Reliability
If the driving instruction signal remains in the first state, then the latch circuit stays latched, but the motor cannot respond to new current command values
Solution Approach 1:
The controller switches the driving instruction signal to the second state in advance when detecting a current command value change, before the system would naturally fail to respond. This preliminary switching action ensures the latch circuit releases and the motor can immediately respond to the new command value without delay or failure.
Data Source
AI summary
A motor driving apparatus includes a driving circuit that drives a motor based on a driving instruction signal at a first state of the first state and a second state which are binarized, a current feedback circuit including a latch circuit, and a controller that outputs the driving instruction signal and a current command signal. The latch circuit latches a third state of the third state and a fourth state which are binarized if a motor current value exceeds a current command value. When the driving instruction signal becomes the second state, the latch circuit releases the latching of the third state and outputs a signal of the fourth state. The controller outputs the driving instruction signal of the second state along with the current command signal so as to release the latching of the latch circuit when outputting the current command signal with the current command value changed.