Motor Driving Apparatus Phase Transition Control
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Solution Overview
Problem
Conventional motor driving techniques face delays in response and potential vibration/noise due to deviations in the phase relationship between the rotor rotational phase and the driving waveform phase, especially during acceleration or deceleration, and have limitations in high-speed position detection accuracy.
Innovation Solution
A motor driving apparatus with a detection unit for rotational position and a generation unit that sets a phase difference and changing time for the driving waveform, ensuring smooth phase transitions and synchronization between the rotor position and the driving waveform, reducing vibration and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional position detection mechanism is used to detect rotor position, then the structure is simple, but the response delay occurs when acceleration or deceleration is performed
Solution Approach 1:
The system performs preliminary action by detecting changes in the phase relationship between rotor detection phase and driving waveform phase, and proactively adjusting the driving waveform phase before significant deviation occurs. The control unit continuously monitors the phase relationship and preemptively compensates for phase deviations, eliminating the need for lengthy compensation processes after detection.
2Measurement precision
If the resolution of square wave signal is enhanced to increase position detection accuracy, then measurement precision is improved, but frequency characteristics cause detection failure during high speed rotation
Solution Approach 1:
The system uses feedback by continuously detecting the rotor position using the square wave signal and monitoring the phase relationship between the detection phase and driving waveform phase. The control unit adjusts the driving waveform phase based on this feedback to maintain synchronization, enabling accurate position detection even during high-speed rotation where frequency characteristics would normally cause detection failure.
3Productivity
If the phase relationship instruction value is changed to improve driving efficiency, then productivity is improved, but the driving waveform becomes discontinuous causing vibration and noise
Solution Approach 1:
The system applies dynamics by dynamically adjusting the driving waveform phase in a continuous and smooth manner rather than making abrupt changes. The control unit modifies the phase incrementally, ensuring the driving waveform remains continuous and preventing vibration and noise while maintaining improved driving efficiency through optimized phase relationships.
4Measurement precision
If compensation process is performed after detecting phase deviation, then measurement precision is maintained, but response time is delayed
Solution Approach 1:
The system skips the lengthy compensation process by detecting phase deviations in real-time and immediately adjusting the driving waveform phase through continuous feedback control. The control unit rushes through the correction by proactively and continuously adapting the phase relationship, eliminating the delay between detection and compensation that characterizes conventional methods.
Data Source
AI summary
An apparatus includes at least one processor or circuit programmed to function as a detection unit that detects a rotational position of a rotor, and a generation unit that generates a driving waveform for a motor based on the detected rotational position. The generation unit includes a phase difference setting unit that sets a phase difference between the rotational position and the driving waveform, a changing time setting unit that sets a changing time, which is a time required for changing the phase difference from a phase difference before the change to a phase difference after the change, in a case where the set phase difference is changed, and a determination unit that determines a phase of the driving waveform based on the phase difference before the change, the phase difference after the change, and the changing time.