Motor Control Circuit with Segmented Determination for Speed Responsiveness
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Solution Overview
Problem
Existing motor control systems face increased processing loads when determining motor malfunctions or deterioration, leading to decreased responsiveness and accuracy in controlling motor rotational speed changes.
Innovation Solution
A motor control circuit that includes a determination circuit to detect motor malfunctions or deterioration by analyzing current, temperature, and voltage data, allowing for concurrent determination and control processes without interrupting motor operation, thus reducing the processing load on the control unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control unit performs both motor control and malfunction determination processes, then comprehensive monitoring is achieved, but the processing load increases and responsiveness to speed command changes decreases
Solution Approach 1:
The patent divides the control system into two independent parts: a control unit for motor control operations and a determination circuit for malfunction detection. This segmentation allows each component to specialize in its function, with the determination circuit handling monitoring tasks independently without burdening the control unit, thereby maintaining high responsiveness to speed commands while ensuring reliable malfunction detection
Solution Approach 2:
The determination circuit acts as an intermediary component that monitors motor operations independently. It receives operational data from the motor system and performs malfunction determination separately from the control unit, enabling parallel processing that prevents interference between control and monitoring functions
2Device complexity
If the control unit handles all processing including malfunction determination, then centralized control is maintained, but the processing load increases and control accuracy decreases
Solution Approach 1:
The patent segments the processing functions by separating malfunction determination from the control unit and placing it in an independent determination circuit. This division reduces the processing load on the control unit, allowing it to focus on precise motor control operations while the determination circuit handles monitoring, thereby improving overall control accuracy without significantly increasing system complexity
3Reliability
If the control unit processes malfunction determination during motor operation, then real-time monitoring is achieved, but responsiveness to speed command changes is delayed
Solution Approach 1:
The patent implements real-time malfunction monitoring through a separate determination circuit that operates independently and concurrently with the control unit. This parallel architecture enables both functions to execute simultaneously without interfering with each other, ensuring that speed command responses are not delayed by monitoring operations
Solution Approach 2:
The determination circuit continuously monitors motor operations in parallel with the control unit's speed control functions. This continuous parallel operation ensures that malfunction detection occurs in real-time without interrupting or delaying the control unit's responsiveness to speed command changes
Data Source
AI summary
A motor control circuit includes a control circuit configured to output a pulse width modulation signal for controlling a switching operation of an inverter circuit, the inverter circuit being configured to supply an alternating current power to a motor, and includes a speed-change detecting circuit configured to detect a change in a speed command signal and, output, in response to the change meeting and exceeding a predetermined limit, a signal indicating that the speed command signal has changed to the control circuit to cause the control circuit to change a duty cycle of the pulse width modulation signal, the speed command signal specifying a target value of a rotational speed of the motor.