Stepping Motor Driving Device Standby Phase Synchronization
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Solution Overview
Problem
Conventional printer devices using stepping motors face inefficiencies due to phase shifts between electrical and mechanical angles when transitioning from a standby mode, leading to unintended sheet conveyance during phase matching processes.
Innovation Solution
A driving device for stepping motors that includes a motor driving circuit, memory, and a controller to synchronize the electrical angle with the mechanical angle, storing the electrical angle value during standby and restoring it upon power resumption without rotating the motor, thus preventing unintended conveyance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phase matching is performed by driving the stepping motor when power is resumed from standby mode, then the electrical angle and mechanical angle are synchronized, but the sheet is unintentionally conveyed requiring extra reverse rotation driving
Solution Approach 1:
The patent applies preliminary action by storing the electrical angle value in memory before entering standby mode, and restoring this stored value when power is resumed. This preliminary preparation eliminates the need for motor-driven phase matching, preventing unintended sheet conveyance while achieving phase synchronization between electrical and mechanical angles.
2Reliability
If the stepping motor is driven for phase matching, then phase synchronization is achieved, but additional reverse rotation driving is required which consumes extra energy
Solution Approach 1:
The patent stores the electrical angle value in memory before standby mode and restores it upon power resumption. This preliminary action achieves phase synchronization without driving the motor, thereby eliminating the energy consumption associated with both the forward phase matching drive and the subsequent reverse rotation correction drive.
3Use of energy by moving object
If power is stopped during standby mode to reduce consumption, then energy efficiency is improved, but phase shift occurs between electrical and mechanical angles when power is resumed
Solution Approach 1:
The patent applies preliminary action by storing the electrical angle value in memory before power is stopped during standby mode. When power is resumed, this stored value is restored to the electrical angle register, enabling phase synchronization to be achieved without requiring motor rotation. This resolves the contradiction by maintaining energy efficiency during standby while ensuring phase synchronization upon power resumption.
Data Source
AI summary
A driving device for a stepping motor includes a motor driving circuit configured to generate a current waveform representing an electrical angle in synchronization with a mechanical angle of the stepping motor, and excite the stepping motor using the current waveform; a memory configured to store a value of the electrical angle; and a controller configured to: when a power supply to the stepping motor and the motor driving circuit is stopped, store a first value of the electrical angle held by the motor driving circuit in the memory; and when the power supply is resumed, replace a value of the electrical angle of the motor driving circuit with the first value while suppressing a rotational operation of the stepping motor.