Motor Control Device Preventing Reverse Start Voltage Spikes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional image forming apparatuses face issues with motor breakdown when starting a motor in reverse direction, as counterelectromotive force and applied voltage can result in high voltage spikes, necessitating a solution that does not require detecting the motor's rotation direction.
Innovation Solution
A motor control device that receives a drive command with a rotation direction command, stores the motor's rotation direction, and controls rotation reversing based on the received and stored directions, allowing for safe startup and reversal without detecting the motor's current rotation direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a motor is started to rotate in reverse direction when the motor is rotating, then the rotation direction can be changed, but a high voltage is applied to the armature which can result in breakdown of the motor
Solution Approach 1:
The control device stores the rotation direction command before executing reverse rotation. By preliminarily recording the intended rotation direction in storage, the system can safely manage the reverse rotation process without applying harmful high voltage to the armature, thus preventing motor breakdown while enabling rotation direction changes.
2Reliability
If rotation direction detection is implemented to prevent reverse starting, then motor protection is improved, but device complexity increases
Solution Approach 1:
Instead of detecting the actual rotation direction of the motor, the control device uses a storage unit to copy and retain the rotation direction command that was issued. This copied command information is sufficient to determine whether reverse rotation should be permitted, eliminating the need for complex rotation direction detection hardware while maintaining motor protection.
3Measurement precision
If rotation direction detection is required to control reverse rotation, then rotation control precision is improved, but ease of operation deteriorates
Solution Approach 1:
The control device performs self-service by using its own stored rotation direction command to determine whether reverse rotation should be executed. The storage unit already contains the necessary rotation direction information from the original command, eliminating the need for external or complex detection systems and simplifying the overall operation while maintaining control precision.
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 prevents motor breakdown by ensuring safe reverse starting and operation, avoiding high voltage spikes and eliminating the need for rotation direction detection, thus enhancing motor control reliability.
Implementation Method 1
because a counterelectromotive force and a voltage applied to drive the motor are in the same direction, a high voltage is undesirably applied to an armature
Data Source
AI summary
A motor control device for driving a motor, the motor control device includes: a receiver configured to receive, from an external source, a drive command containing a rotation direction command designating a rotation direction of the motor; a storage part configured to store the rotation direction of the motor indicated by the rotation direction command when the motor is driven using the rotation direction command; and a controller configured to, when a new piece of the drive command is received from the external source, control rotation reversing of the motor based on a rotation direction of the motor indicated by the rotation direction command contained in the received piece of the drive command and the rotation direction of the motor stored in the storage part.