Motor Drive Control Device Adaptive Current Pattern
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Solution Overview
Problem
Conventional motor drive control methods using pseudo-sine-waveform exciting current patterns do not effectively account for the unique characteristics of individual motors, leading to inefficiencies, vibrations, and noise during rotor rotation due to excess or deficient current.
Innovation Solution
A motor drive control device comprising a PWM control circuit, H-bridge circuit, current detection circuit, and determination circuit that adjusts the exciting current pattern based on real-time current detection to match the motor's operating characteristics, using NMOS transistors and resistors for precise control and correction of the current pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a pseudo-sine-waveform exciting current pattern is used for motor drive control, then an ideal rotating magnetic field is generated, but the motor does not operate efficiently due to mismatch with individual motor characteristics
Solution Approach 1:
The patent applies dynamics by making the exciting current pattern adjustable and adaptable rather than fixed. The determination circuit dynamically modifies the pseudo-sine-waveform parameters based on detected motor characteristics, allowing the system to transition from a static ideal pattern to a dynamic optimized pattern that adapts to each motor's unique properties.
Solution Approach 2:
The patent implements parameter changes by modifying the exciting current waveform parameters (amplitude, phase, frequency) based on detected motor characteristics. The determination circuit adjusts these parameters to match individual motor properties, transforming the universal pseudo-sine-waveform into a customized current pattern that optimizes efficiency for each specific motor.
2Device complexity
If a fixed pseudo-sine-waveform exciting current pattern is applied to all motors, then the control system is simple, but vibrations and noises are generated due to current excess and deficiency
Solution Approach 1:
The patent implements feedback by using the current detection circuit to monitor actual motor current consumption and the determination circuit to compare detected characteristics with the exciting current pattern. This closed-loop feedback mechanism automatically adjusts the current pattern to eliminate vibrations and noises caused by current mismatch, while maintaining relatively simple control architecture.
Solution Approach 2:
The determination circuit performs self-service by automatically detecting motor characteristics and autonomously adjusting the exciting current pattern without requiring complex external control or manual intervention. The system self-optimizes by using its own detection capabilities to identify and correct current imbalances that cause vibrations and noises.
3Productivity
If the exciting current pattern is adjusted according to motor characteristics, then good-efficiency motor drive is achieved, but the control system becomes more complex
Solution Approach 1:
The patent applies universality by designing the determination circuit to handle multiple functions: detecting motor characteristics, analyzing current patterns, comparing data, and generating correction signals. This multi-functional approach achieves customized motor control without requiring separate dedicated components for each function, thereby limiting the increase in system complexity while maintaining high drive efficiency.
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 solution enables efficient motor drive control by generating a magnetic field tailored to each motor's characteristics, reducing vibrations and noise, and improving controllability through adaptive adjustment of the exciting current pattern.
Implementation Method 1
a coil 10 to which an exciting current is supplied by the on/off of the switch transistors of the H bridge circuit (21 to 24)
Data Source
AI summary
According to one embodiment, a motor drive control device includes a PWM control circuit that generates PWM signals corresponding to a predetermined exciting current pattern, an H bridge circuit that is constituted of switch transistors whose on/off is controlled by the PWM signals, a coil to which an exciting current is supplied from the H bridge circuit, and a current detection circuit that detects a current flowing into the coil. A value of a parameter of the exciting current pattern is corrected by using the detection result of the current detection circuit.