Motor Driving Control Apparatus Interphase Short-Circuiting Unit
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Solution Overview
Problem
Conventional regenerative braking systems for three-phase brushless motors face increased burdens on electronic components when external forces are applied for long periods or with large loads, especially when there is no power supply, leading to inefficiencies and potential component overload.
Innovation Solution
A motor driving control apparatus that selectively energizes three-phase coils, switches energizing phases, and uses an interphase short-circuiting unit to short-circuit coils in different combinations, allowing for independent not-powered braking by utilizing counter electromotive force, thereby reducing the load on electronic components during increased external forces or power outages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If regenerative braking is used to stop the motor quickly, then braking efficiency is improved, but the burden on electronic components increases when external forces are applied for long periods or with large loads
Solution Approach 1:
A protecting operation unit is introduced as an intermediary between the brake control unit and the interphase short-circuiting unit. This protecting unit monitors voltage conditions and controls the timing of short-circuiting operations, preventing excessive current from damaging electronic components while maintaining effective braking performance
Solution Approach 2:
The brake control unit receives feedback about voltage conditions from the protecting operation unit and adjusts the short-circuiting control accordingly. When voltage exceeds safe thresholds, the protecting unit prevents further short-circuiting commands, creating a feedback loop that protects components while maintaining braking functionality within safe operating parameters
2Reliability
If the interphase short-circuiting unit continuously short-circuits coils to maintain braking, then braking effectiveness is maintained, but excessive current may damage the short-circuiting unit and parasitic diodes
Solution Approach 1:
The system dynamically adjusts the short-circuiting operation based on real-time voltage conditions. The protecting operation unit enables short-circuiting when voltage is within safe ranges and disables it when voltage exceeds thresholds, creating a dynamic control system that adapts to changing load conditions rather than operating in a fixed state
Solution Approach 2:
The brake control unit is designed with protective logic that anticipates dangerous voltage conditions and prevents excessive current flow before it can damage components. The controlling logic includes built-in protection that stops short-circuiting commands when voltage thresholds are approached, cushioning against potential component damage before it occurs
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 enables efficient and independent not-powered braking, reducing the burden on electronic components and preventing excessive load on the interphase short-circuiting unit and parasitic diodes, even during prolonged external forces or power interruptions, thus enhancing the reliability and longevity of the motor driving control system.
Implementation Method 1
By short-circuiting the motor coils, and short-circuiting the counter electromotive force generated between the motor coils, the rotation of the motor can be stopped quickly with the use of regenerative braking
Implementation Method 2
a protecting operation unit that causes the interphase short-circuiting unit to release short-circuiting the coils or that suppresses short-circuited current based on a voltage condition of a one-phase coil
Data Source
AI summary
A motor driving control apparatus according to an embodiment includes an interphase short-circuiting unit that is connected to at least two-phase coils of the three-phase coils, and that short-circuits at least a pair of coils among three pairs that are different combinations of two coils of the three-phase coils, in response to a short-circuiting signal; a short-circuiting signal output unit that is connected between the coil and the interphase short-circuiting unit, and that outputs a short-circuiting signal to the interphase short-circuiting unit when an input of the brake control signal is received; and a protecting operation unit that stops the interphase short-circuiting unit short-circuiting the coils, based on a voltage condition of a one-phase coil of the three-phase coils.