Motor Control for Recording Apparatus Counter Electromotive Force
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Solution Overview
Problem
Existing recording apparatuses face issues with counter electromotive force generation during manual introduction of a roll-shaped recording medium, which can affect motor control sections with high voltage or current, leading to adverse influences and increased complexity and cost.
Innovation Solution
A recording apparatus with a motor control section that alternates between braking and non-braking states to weaken momentum and suppress counter electromotive force, using an H-bridge motor driving circuit to control the motor's states and potentially incorporating a counter electromotive force detection section to adjust control accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a discharge circuit is provided to suppress counter electromotive force, then adverse influences on the motor control section are suppressed, but the apparatus becomes complicated and cost increases
Solution Approach 1:
The patent extracts and eliminates the discharge circuit from the system by using the motor driving circuit's existing transistors to directly control the motor in braking and non-braking states, thereby suppressing counter electromotive force without adding protective components
Solution Approach 2:
The motor driving circuit is made multi-functional by enabling it to both drive the motor and suppress counter electromotive force through alternating braking states, eliminating the need for a separate discharge circuit
2Object-affected harmful factors
If the motor is continuously braked to suppress counter electromotive force, then high voltage and current are suppressed, but the motor cannot rotate properly for recording medium transport
Solution Approach 1:
The patent applies periodic action by alternating the motor between braking states and non-braking states, creating a rhythmic control pattern that suppresses counter electromotive force while allowing necessary rotation for recording medium transport
3Speed
If the motor rotates rapidly when recording medium is manually introduced, then the recording medium can be fed quickly, but counter electromotive force is generated and affects the motor control section
Solution Approach 1:
The patent applies preliminary anti-action by proactively controlling the motor to enter braking states before counter electromotive force can be generated during manual recording medium introduction, preventing the harmful effect before it occurs
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
Effectively suppresses counter electromotive force and adverse influences on motor control sections, reducing the risk of high voltage or current application and simplifying the apparatus design, thereby enhancing operational safety and reducing costs.
Implementation Method 1
the motor is rotated for rotating the roll of the recording medium, and thereby a counter electromotive force is generated
Data Source
AI summary
A recording apparatus includes a support shaft that supports a roll-shaped recording medium; a motor that applies a rotational force to the support shaft; a motor control section that controls the motor; and a recording section that performs recording on the recording medium transported from the support shaft, in which the motor control section is capable of controlling the motor so that the motor alternately enters a braking state and a non-braking state.