Brushless Motor Inverter Forcible Stop Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In motor-driven apparatuses with brushless motors, inefficiencies occur due to continued switching operations during periods when the full-wave rectified voltage is smaller than the induced voltage, leading to wasteful power consumption.
Innovation Solution
Incorporating a forcible stop unit that temporarily stops the switching operation of the drive circuit when the full-wave rectified voltage is smaller than the induced voltage, utilizing multiple obtainment units for accurate rectified and induced voltage information to determine optimal stop periods, and employing a controller to manage these operations effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the inverter circuit continues to perform switching operation during the period when pulsating voltage is smaller than induced voltage, then the brushless motor can be driven continuously, but power consumption increases due to wasteful switching operations
Solution Approach 1:
The inverter circuit performs switching operations periodically based on the pulsating voltage waveform, specifically activating switching during periods when pulsating voltage exceeds induced voltage and stopping during periods when it is lower, converting continuous operation into periodic effective action to eliminate wasteful energy consumption
Solution Approach 2:
The control system dynamically adjusts the switching operation timing based on real-time comparison between pulsating voltage and induced voltage, making the switching operation adaptive to voltage conditions rather than operating at fixed intervals, thereby optimizing energy efficiency while maintaining continuous motor operation
2Loss of energy
If the switching operation is stopped when full-wave rectified voltage is smaller than induced voltage, then power consumption is reduced, but the control system complexity increases
Solution Approach 1:
The control system continuously monitors and compares the full-wave rectified voltage and induced voltage levels, using this feedback information to determine when to start and stop switching operations, thereby automatically adjusting power consumption based on real-time voltage conditions without requiring complex manual control
Solution Approach 2:
The system uses its own voltage measurements and comparisons to automatically control the switching operation timing, with the control unit making decisions based on internal voltage state assessment rather than external control signals, simplifying the overall control architecture while achieving energy 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 approach reduces power consumption and enhances the efficient driving of brushless motors by aligning switching operations with voltage conditions, thereby optimizing energy use.
Implementation Method 1
a full-wave rectifier circuit; The full-wave rectifier circuit full-wave rectifies an alternating-current power supply voltage
Implementation Method 2
an induced voltage generated by the brushless motor
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A motor-driven apparatus (1; 40; 70) in one aspect of the present disclosure includes: a brushless motor (10); a full-wave rectifier circuit (16); a drive circuit (18); a controller (20; 43; 72); and a forcible stop unit (20; 43; 72). The forcible stop unit (20; 43; 72) performs a forcible stop control to temporarily forcibly stop a switching operation of a plurality of switching elements (Q1-Q6) during a stop period when a full-wave rectified voltage is smaller than an induced voltage generated by a plurality of coils, and the switching operation of the plurality of switching elements (Q1-Q6) is to be stopped.