Conveyance Device Motor Control Delay Cancellation

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Solution Overview

Problem

Conventional conveyance devices face challenges in accurately controlling the motor revolution speed and position feedback control, leading to variations in the time it takes for a conveyance object to reach the target stop position due to changes in motor load and temperature, affecting the accuracy and productivity of image forming and paper processing applications.

Innovation Solution

A conveyance device with a motor, sensor, instruction unit, and control unit that performs speed feedback control based on reference position information, motor revolution speed information, and position information to cancel delays and maintain accurate motor control, using a predetermined number of pulses for position feedback control to ensure consistent arrival at the target position.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If position feedback control is performed based on the number of remaining pulses to the target stop position, then the control simplicity is improved, but the period between the start of position feedback control and the arrival at the target position varies depending on motor load

Engineering Contradiction:

Improvecontrol simplicityVSAvoidcontrol timing consistency

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent implements speed feedback control that continuously monitors the actual motor speed and compares it with the target speed, adjusting the control signals to compensate for load variations. This feedback mechanism ensures that the period from the start of position feedback control to arrival at the target position remains constant regardless of motor load changes.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent performs preliminary speed adjustment before entering the deceleration phase by controlling the motor speed to be a predetermined value before the deceleration area is entered. This preliminary action ensures that the subsequent position feedback control period remains consistent by establishing a known initial condition.

Inventive Principle:

Principle #10Preliminary action

2Loss of energy

If speed feedback control is terminated and position feedback control is performed based on remaining pulses in the deceleration area, then the energy consumption is reduced, but the stop position accuracy deteriorates due to motor load variations

Engineering Contradiction:

Improveenergy consumptionVSAvoidstop position accuracy

Core Design Contradiction:

Loss of energyVSManufacturing precision

Solution Approach 1:

The patent dynamically adjusts the control strategy based on the operational phase. During the deceleration area, it maintains speed feedback control rather than switching to position feedback control based on remaining pulses. The control unit continues to adjust the target revolution speed according to actual speed feedback, ensuring accurate stop position even under varying motor load conditions.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent maintains continuous speed feedback control during the deceleration phase, using real-time speed information to adjust control signals. This feedback mechanism compensates for motor load variations and ensures the conveyance object stops at the accurate target position, preventing the deterioration of stop position accuracy.

Inventive Principle:

Principle #23Feedback

3Device complexity

If the target revolution speed is not adjusted based on actual speed feedback during deceleration, then the control complexity is reduced, but the conveyance object cannot be stopped at the accurate target position under varying motor load

Engineering Contradiction:

Improvecontrol complexityVSAvoidstop position accuracy

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent implements continuous speed feedback control during the deceleration phase, where the control unit adjusts the target revolution speed based on actual speed feedback from the motor. This feedback loop compensates for motor load variations and ensures the conveyance object stops at the accurate target position, maintaining stop position accuracy without excessive complexity.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent dynamically changes the target revolution speed parameter based on actual speed feedback and motor load conditions. By adjusting this key parameter in real-time, the system achieves accurate stop position under varying loads without requiring complex additional hardware or control mechanisms.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9272866B2Conveyance device, conveyance device control method, and computer program product

Publication Date: 2016.03.01 RICOH CO LTD

AI summary

Provided is a conveyance device that includes: a conveyance unit configured to convey a conveyance object; a motor configured to drive the conveyance unit; a sensor configured to detect a position of the conveyance object; an instruction unit configured to generate an instruction signal for conveying the conveyance object to a target position; and a control unit configured to control the motor by performing a speed feedback control and control the motor so as to cancel a delay between a time when the position of the conveyance object is detected and a time when the speed feedback control is reflected on the motor.