Stepping Motor Noise Reduction via One-Two Phase Excitation
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Solution Overview
Problem
Conventional printers using stepping motors generate uncomfortable noise due to resonance of harmonic components of vibration at frequencies within the audible range, leading to high noise levels that disturb users.
Innovation Solution
The drive transmission system incorporates a stacker exit motor with a two-phase hybrid stepping motor using the one-two phase excitation method, where the least common multiple of meshing and excitation fundamental frequencies exceeds the audible frequency threshold, reducing noise by preventing resonance of harmonic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a stepping motor is used to drive the rotating shaft, then precise rotational control is achieved, but noise is generated due to resonance of harmonic components within the audible frequency range
Solution Approach 1:
The patent changes the excitation frequency parameters of the stepping motor by using a one-two phase excitation method instead of conventional two-phase excitation. This parameter change shifts the peak frequency of harmonic components from the audible range (below 20kHz) to beyond the audible range (above 20kHz), thereby reducing perceived noise while maintaining precise rotational control.
Solution Approach 2:
The patent employs periodic excitation of the electromagnets in a one-two phase pattern, where phases are excited in a repeating sequence (one phase, then two phases). This periodic action creates a specific frequency spectrum that pushes harmonic resonance peaks beyond the human audible range, reducing uncomfortable noise while maintaining the periodic rotational motion needed for precise positioning.
2Ease of operation
If conventional two-phase excitation is used, then simple control is maintained, but noise increases due to resonance within audible frequency range
Solution Approach 1:
The patent modifies the excitation control parameters by implementing a one-two phase excitation sequence instead of uniform two-phase excitation. This parameter modification maintains the periodic nature of control (ease of implementation) while changing the frequency characteristics to push noise peaks beyond 20kHz, thereby reducing audible noise without significantly complicating the control system.
3Productivity
If the least common multiple of meshing frequency and excitation fundamental frequency is kept low, then synchronization is easier, but noise increases due to resonance within audible range
Solution Approach 1:
The patent changes the excitation fundamental frequency parameters such that the least common multiple of the meshing frequency (determined by gear teeth and rotation speed) and the excitation fundamental frequency exceeds 20kHz. This parameter change maintains synchronization efficiency (as the system still operates at the same rotation speed and gear meshing rate) while pushing the resonant peak frequency beyond the audible range, thereby reducing noise.
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 configuration significantly reduces uncomfortable noise levels by shifting the peak frequency beyond the human audible range, improving user experience by minimizing noise disturbance.
Implementation Method 1
The plural electromagnets are arranged in a circumferential direction of the rotating shaft, and surround the magnet. The drive source drives the rotating shaft to rotate by a predetermined rotation angle by exciting at least one of the plural electromagnets in accordance with an input of an input signal
Implementation Method 2
periodically changing a magnetic pole to which each of the plural electromagnets is excited in response to an input of the input signal
Data Source
AI summary
A drive transmission system includes a drive source and a gear. The drive source includes a rotating shaft, a magnet supported by the rotating shaft, and plural electromagnets. The plural electromagnets are arranged in a circumferential direction of the rotating shaft, and surround the magnet. The drive source drives the rotating shaft to rotate by a predetermined rotation angle by exciting at least one of the plural electromagnets in accordance with an input of an input signal and by periodically changing a magnetic pole to which each of the plural electromagnets is excited in response to an input of the input signal. The gear is supported by the rotating shaft.