Motor control device, motor drive device, motor system, and electrical apparatus
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Solution Overview
Problem
Existing motor control systems for three-phase brushless motors face challenges in achieving precise control and miniaturization due to discrete peak value changes in drive signals, particularly in microcomputer-based systems, and lack efficient switching between two-phase and three-phase modulation control modes.
Innovation Solution
A motor control device that includes a generation unit capable of switching between two-phase and three-phase modulation control modes, generating analog voltages with continuous peak values, and utilizing a reverse unit to invert duty cycles for improved control accuracy and circuit sharing, thereby enabling miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If discrete peak value changes are used in microcomputer-based systems, then control implementation is simplified, but control precision deteriorates
Solution Approach 1:
The patent replaces microcomputer-based discrete digital control with an analog circuit system that generates continuous peak value drive signals. The analog voltage generation unit produces drive signals with continuously variable peak values, eliminating the discrete step changes inherent in microcomputer control. This substitution of analog for digital processing achieves both high precision (continuous variation) and simplicity (dedicated analog circuitry without complex software).
2Device complexity
If two-phase control means is used, then circuit complexity is reduced, but control performance deteriorates
Solution Approach 1:
The patent implements a dynamic switching mechanism that allows the system to adapt between two-phase and three-phase control modes based on operational requirements. The modulation unit can dynamically reconfigure which phases are active, enabling the system to use simpler two-phase control when sufficient and more complex three-phase control when needed for superior performance, thus optimizing both circuit complexity and control performance across different operating conditions.
3Reliability
If three-phase control means is used, then control performance is improved, but device complexity increases
Solution Approach 1:
The patent designs a universal control architecture where the same analog voltage generation unit and modulation unit can operate in both two-phase and three-phase modes. By making the control system multi-functional, the three-phase capability is integrated without requiring separate dedicated circuitry, thus improving control performance while minimizing the increase in device complexity through shared components.
4Ease of operation
If switching elements are controlled with discrete signals, then switching control is simplified, but miniaturization is hindered
Solution Approach 1:
The patent merges the voltage generation and modulation functions into an integrated analog circuit system that directly produces PWM drive signals for switching elements. By combining these functions in dedicated analog circuitry rather than using separate digital processing stages, the system achieves simplified switching control while reducing overall device volume, enabling miniaturization.
Data Source
AI summary
The present disclosure provides a motor control device that realizes a drive signal for each phase in a three-phase modulation control system with an analog circuit. The motor control device includes a generator, a modulation unit and inverting unit. The generator is configured to receive an input voltage and generate an analog voltage having a crest value corresponding to the input voltage and having a reference potential or higher. The modulation unit is configured to generate a PWM voltage based on the analog voltage output from the generation unit. The inverting unit is configured to invert a duty in a predetermined period of the PWM voltage.