Eccentric Shaft Phase Control for Low-Vibration Compaction
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Solution Overview
Problem
Vibratory compaction machines generate noise and vibrations due to the relative position of eccentric shafts, which need to be controlled to reduce environmental disturbances.
Innovation Solution
A computer system calculates lead and follower motor quadrature currents, determines the phase angle between them, and adjusts the rotation speed of the follower motor using closed-loop control to synchronize the eccentric shafts, achieving a target phase angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the rotation speed of the follower motor is adjusted to synchronize with the lead motor, then the phase angle control precision is improved, but the system complexity increases due to closed-loop control requirements
Solution Approach 1:
The patent implements closed-loop control by continuously monitoring the phase angle between lead and follower motors and adjusting the follower motor speed accordingly. The control system calculates the phase angle from quadrature currents and modifies the follower motor rotation speed to maintain the target phase angle, creating a feedback mechanism that improves precision while managing system complexity through automated control.
2Object-generated harmful factors
If real-time phase angle determination is implemented between lead and follower motors, then the vibration and noise control is improved, but the computational load and processing requirements increase
Solution Approach 1:
The patent calculates quadrature currents for both lead and follower motors in real-time and uses these pre-calculated values to determine the phase angle. By preparing the current data and phase angle calculations in advance within the control cycle, the system reduces the processing time required for real-time vibration and noise control without compromising the accuracy of phase angle determination.
Data Source
AI summary
A computer system detects and controls a relative position of two rotating eccentric shafts. Processing circuitry calculates a lead motor quadrature current of a lead motor driving a first eccentric shaft; calculates a follower motor quadrature current of a follower motor driving a second eccentric shaft; determines in real-time a phase angle between the lead motor and follower motor quadrature currents; modifies a rotation speed of the follower motor so that it is equal to a rotation speed of the leading motor; and when the rotation speed of the follower motor is equal to the rotation speed of the lead motor, modifies the rotation speed of the follower motor to adjust the phase angle to be equal to a main target phase angle.