Stepping Motor Control for Wireless Charging Noise Reduction
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Solution Overview
Problem
Stepping motors used in wireless charging applications, especially in low-temperature environments, face challenges with synchronization loss and increased noise due to resonance frequency domains, which existing methods fail to adequately address.
Innovation Solution
A control apparatus that operates a stepping motor at a first driving frequency lower than the resonance frequency domain to initiate startup and transition to a second driving frequency higher than the resonance domain at a stable point, ensuring sufficient torque and preventing synchronization loss, while reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a stepping motor is driven to avoid the resonance frequency domain, then vibration and noise are reduced, but the likelihood of synchronization loss increases
Solution Approach 1:
The patent applies dynamics by making the driving frequency adjustable rather than fixed. The control device dynamically changes the driving frequency based on motor operating conditions, allowing the system to adapt between avoiding resonance (for noise reduction) and operating within resonance (for sufficient torque), thereby resolving the contradiction between noise reduction and synchronization stability
Solution Approach 2:
The patent changes the driving frequency parameter based on motor state. By detecting motor current and adjusting the driving frequency accordingly, the system can switch between frequency ranges to maintain both low noise operation and sufficient torque, preventing synchronization loss while reducing vibration
2Adaptability or versatility
If a stepping motor is driven at low temperature, then the motor can operate in cold environments, but the torque necessary to drive the motor increases due to increased grease viscosity
Solution Approach 1:
The patent changes the driving frequency parameter in response to temperature conditions. At low temperatures, the control device adjusts the driving frequency to a range that provides sufficient torque to overcome increased grease viscosity, while still managing to reduce noise by avoiding the resonance frequency domain when possible
3Productivity
If the driving frequency is increased to improve motor response, then speed and productivity are improved, but vibration and noise increase due to resonance
Solution Approach 1:
The patent makes the driving frequency dynamic rather than fixed. The control device continuously monitors motor operation and adjusts the driving frequency in real-time, allowing the system to achieve fast response when needed while avoiding resonance frequencies that cause noise, thus resolving the contradiction between productivity and noise reduction
Data Source
AI summary
A control apparatus controls the operation of a stepping motor. The output unit operates a motor in a stopped state at a first driving frequency and switches to a second driving frequency at a stable point. The first driving frequency is a frequency lower than a resonance frequency range of the motor, and the second driving frequency is a frequency higher than the resonance frequency range of the motor.