Sheet Conveyance Motor Control for Torque and Power Optimization
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Solution Overview
Problem
In image forming apparatuses, the motor control systems face challenges in efficiently managing torque and power consumption when conveying sheets, particularly due to varying load torques during sheet conveyance, leading to potential rotor synchronization issues and increased power consumption.
Innovation Solution
A sheet conveying apparatus with a motor control system that adjusts the torque current and excitation current components in a rotating coordinate system to maintain optimal magnetic flux, weakening the magnetic flux during sheet conveyance and strengthening it before the sheet reaches the conveyance roller, thereby optimizing torque and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If field weakening is performed by controlling excitation current to negative values, then induced voltage magnitude is reduced and available voltage is maintained, but torque is reduced due to weaker magnetic flux
Solution Approach 1:
The patent applies dynamics by making the excitation current component dynamically adjustable based on rotor speed. Instead of a fixed negative value, the excitation current is varied according to the rotor speed to optimize the balance between induced voltage reduction and torque maintenance, allowing the system to adapt to different operating conditions
Solution Approach 2:
The patent changes the parameter of excitation current from a fixed negative value to a variable parameter that depends on rotor speed. By adjusting the excitation current component based on rotor speed, the system optimizes the magnetic flux intensity to maintain torque while reducing induced voltage and power consumption
2Reliability
If excitation current component is controlled to negative value for field weakening, then induced voltage is reduced, but magnetic flux intensity is weakened reducing torque capability
Solution Approach 1:
The patent changes the excitation current parameter dynamically based on rotor speed to maintain optimal magnetic flux. By adjusting the excitation current component according to rotor speed, the system ensures sufficient torque capability while preventing rotor synchronization issues that would occur with excessive field weakening
3Reliability
If torque current component is increased to prevent step-out state, then rotor synchronization is maintained, but power consumption increases due to surplus torque
Solution Approach 1:
The patent applies feedback by continuously monitoring the rotor state and adjusting the torque current component accordingly. The vector control system uses feedback to maintain precise rotor synchronization while optimizing torque current to avoid surplus torque and reduce power consumption
Solution Approach 2:
The patent dynamically adjusts the torque current component parameter based on actual rotor conditions. By changing the torque current in response to load variations and rotor speed, the system maintains synchronization reliability while minimizing power consumption through precise torque control
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 approach ensures efficient torque management and reduced power consumption by aligning the magnetic flux with the sheet's position, preventing unnecessary current supply and maintaining rotor synchronization.
Implementation Method 1
In the winding of each phase of the motor, an induced voltage is generated by rotation of the rotor
Implementation Method 2
a current component generating torque for a rotor to rotate (a torque current component)
Implementation Method 3
a current component affecting intensity of a magnetic flux penetrating through the motor winding (an excitation current component)
Data Source
AI summary
A sheet conveying apparatus for conveying a sheet includes a conveyance roller, a motor, a phase determiner, and a controller. The phase determiner determines a rotor rotation phase of the motor that drives the conveyance roller to convey the sheet. The controller controls so that a value of a rotor torque current component becomes a target value of the torque current component and controls so that an excitation current component value becomes a target value of the excitation current component, and controls to reduce a deviation between a command phase and the determined rotation phase. The controller controls so that a magnetic flux penetrating through a winding is weaker than a magnetic flux of the rotor, and so that a magnetic flux penetrating through the winding in a second period is stronger than the magnetic flux penetrating through the winding in the first period.