Motor Current Reversal via Flyback Energy Recycling
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Solution Overview
Problem
Existing electric motor control systems require significant time to reverse current flow, which increases power consumption and limits motor rotation speed.
Innovation Solution
The implementation of a current switching structure with diodes and capacitors that exploit freewheeling inductive current to generate flyback voltages, reducing the time required for current reversal by storing and recycling energy within the motor winding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional current switching is used in electric motor control, then the motor can operate reliably, but the current reversal time is too long which increases power consumption and limits rotation speed
Solution Approach 1:
The patent converts the harmful effect of inductive kickback voltage (which normally causes delays and requires clamping circuits) into a beneficial flyback voltage that actively assists in reversing current direction. The inductive energy that was previously wasted or problematic is now回收利用 to accelerate the current reversal process, thereby reducing reversal time and power consumption simultaneously.
Solution Approach 2:
The patent changes the voltage parameter dynamically during current reversal by allowing the flyback voltage to rise to high levels (potentially exceeding the power supply voltage) to force rapid current reversal. This parameter change enables the current to switch directions much faster than conventional methods, directly addressing the time loss issue.
2Speed
If conventional H-bridge switching is used, then the motor winding current can be controlled, but the reversal process is slow and requires clamping circuits that increase complexity
Solution Approach 1:
The patent eliminates the need for clamping circuits by converting the inductive kickback into a useful flyback voltage. This not only reduces the current reversal time (improving motor rotation speed) but also simplifies the circuit by removing clamping components, thereby addressing both speed and time loss issues.
Solution Approach 2:
The patent extracts and utilizes the inductive energy from the motor winding itself to create the flyback voltage needed for current reversal. By taking out this previously wasted energy and putting it to productive use, the system achieves faster reversal without requiring additional external energy sources or complex control circuits.
3Loss of time
If higher power supply voltage is used to reduce current reversal time, then the reversal speed improves, but the power consumption increases
Solution Approach 1:
The patent implements self-service by having the motor winding's own inductive energy generate the flyback voltage needed for current reversal. The system uses its internal stored energy rather than requiring higher external power supply voltage, thereby reducing reversal time without increasing power consumption from the external source.
Solution Approach 2:
The patent changes the voltage parameter locally at the switching node by allowing flyback voltage to exceed the power supply voltage temporarily during reversal. This localized parameter change achieves fast reversal without requiring the entire power supply system to operate at higher voltages, thus avoiding increased power consumption.
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 the time needed for current reversal without increasing power consumption, enabling higher motor rotation rates and potentially lower power supply voltages, while maintaining efficient power usage.
Implementation Method 1
a capacitor coupled between a second node of the motor winding and a reference node. The capacitor charges when current flows through the motor winding in a first direction and discharges to cause current to flow through the motor winding in a second direction
Implementation Method 2
a diode having a first terminal coupled to a first node of the motor winding and a second terminal coupled to a second node of the motor winding. The diode conducts current flow in a second direction through the motor winding when current flow reverses direction
Data Source
AI summary
The time required to reverse current flow in an electric motor is reduced by exploiting inductive current that persists in the motor when power is temporarily removed. Energy associated with this inductive current is used to initiate reverse current flow in the motor.