DC Motor Control Circuit for Vibration Suppression
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Solution Overview
Problem
Variations in angular accuracy during DC motor manufacturing lead to difficulties in achieving smooth rotation and suppressing motor vibration/drive noise, even with ideal sine wave current control, and existing solutions involving high-accuracy encoders complicate systems and increase costs.
Innovation Solution
A motor control device with a detection circuit, control circuit, and drive circuit that detects induced voltage parameters in multiple windings and adjusts current amplitude control values to cancel differences, allowing for smooth rotation and reduced motor vibration/drive noise without the need for an encoder device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a current controlled in an ideal sine wave shape is applied to each winding, then motor vibration and drive noise are suppressed, but variations in angular accuracy due to manufacturing variations make it difficult to achieve smooth rotation
Solution Approach 1:
The patent changes the current amplitude parameters for each winding based on detected induced voltage characteristics. By adjusting the amplitude control values according to the detected parameters, the system compensates for manufacturing variations in angular accuracy while maintaining smooth rotation and suppressing motor vibration.
Solution Approach 2:
The patent implements a feedback mechanism where the detection circuit detects induced voltage parameters from each winding, and the control circuit uses this feedback information to adjust the current amplitude control values. This closed-loop approach allows the system to compensate for manufacturing variations and achieve smooth rotation despite angular accuracy variations.
2Manufacturing precision
If a highly accurate encoder device is used to correct current and improve angular accuracy, then motor vibration and drive noise are suppressed, but the system becomes complicated and manufacturing costs increase
Solution Approach 1:
The patent enables the motor system to self-diagnose and self-correct by using detection circuits that measure induced voltage parameters from the windings themselves. The control circuit processes this information and automatically adjusts current amplitudes to compensate for angular accuracy variations, eliminating the need for external encoder devices and reducing system complexity.
Solution Approach 2:
The patent replaces the mechanical encoder device with an electrical detection system that measures induced voltage parameters. This substitution uses electrical field measurements instead of mechanical sensing, simplifying the system structure while achieving the same goal of compensating for angular accuracy variations.
3Object-affected harmful factors
If current step resolution is improved to achieve a more ideal sine wave, then motor vibration and drive noise are suppressed, but the system complexity and manufacturing costs increase
Solution Approach 1:
The patent changes the current amplitude parameters dynamically based on detected induced voltage characteristics. By adjusting the amplitude control values according to the detected parameters, the system achieves smooth rotation and suppresses motor vibration without requiring high current step resolution, thereby avoiding increased control system complexity.
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
The solution effectively offsets variations in angular accuracy and suppresses motor vibration/drive noise by unbalancing current amplitude control values, achieving smooth rotation while maintaining manufacturing cost efficiency.
Implementation Method 1
a detection circuit to detect a first parameter related to an induced voltage generated in the first coil and a second parameter related to an induced voltage generated in the second coil
Data Source
AI summary
According to one embodiment, there is provided a motor control device including a detection circuit, a control circuit and a drive circuit. The detection circuit detects, in a direct current motor with a first coil and second coil, a first parameter related to an induced voltage generated in the first coil and a second parameter related to an induced voltage generated in the second coil. The control circuit changes, according to a difference between the first parameter and the second parameter, at least one of a first amplitude control value of a current of the first coil and a second amplitude control value of a current of the second coil. The drive circuit drives, according to the changed amplitude control value, the first coil and the second coil, respectively.