Motor Drive Regenerative Power Buffer for Controller Hold-Up
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Solution Overview
Problem
Motor drive systems experience energy loss during braking operations due to heat dissipation, which reduces efficiency.
Innovation Solution
A motor drive system that utilizes regenerative energy to charge an energy storage device, which supplies electrical energy to the controller, minimizing energy loss and improving efficiency by using locally stored energy during braking operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If regenerative energy is captured during braking operation, then energy loss is reduced, but the energy storage device charge level may exceed the predetermined threshold value
Solution Approach 1:
The controller continuously monitors the charge level of the energy storage device and dynamically adjusts the charging process. When the charge level reaches or exceeds the predetermined threshold value during regenerative braking, the controller automatically stops charging or redirects the energy flow, ensuring the device remains within safe operating parameters while maximizing energy recovery.
Solution Approach 2:
The system changes the operating parameters of the energy storage device based on real-time conditions. During regenerative braking, when the charge level approaches the threshold, the controller modifies the charging rate or disconnects the charging path, allowing the device to operate at different charge states optimized for both energy recovery and reliable power supply.
2Duration of action of moving object
If the energy storage device is charged to full capacity by the second energy source, then the hold-up time is maximized, but no capacity remains to store regenerative energy during braking
Solution Approach 1:
Instead of charging the energy storage device to full capacity, the system intentionally charges it only to a predetermined threshold value that is below maximum capacity. This partial charging approach leaves sufficient headroom in the energy storage device to accommodate regenerative energy during braking operations, optimizing the balance between hold-up time and energy recovery capacity.
Solution Approach 2:
The second energy source pre-charges the energy storage device to a predetermined threshold level before braking operations occur. This preliminary charging ensures the device has sufficient charge to provide hold-up time while simultaneously preparing capacity to receive regenerative energy during subsequent braking events.
3Loss of energy
If the energy storage device supplies power to the controller during braking, then transmission losses are minimized, but the charge level may drop below the threshold required for hold-up time
Solution Approach 1:
The controller continuously monitors the charge level of the energy storage device and dynamically switches between power sources based on real-time conditions. When the charge level drops toward the threshold during operation, the controller transitions to drawing power from the second energy source, ensuring the hold-up time requirement is maintained while still utilizing stored energy to minimize transmission losses during normal operation.
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 system effectively reduces energy loss during braking by using regenerative energy to charge an energy storage device, ensuring efficient power supply to the controller and minimizing transmission losses, thereby enhancing overall system efficiency.
Implementation Method 1
During a braking operation, motor drive systems generate energy that is typically dissipated as heat... charge the energy storage device with regenerative energy from the motor
Data Source
Figure 1~2
AI summary
A motor drive system comprises: a motor; a controller; a first energy source configured to supply electrical energy to the motor; a second, different energy source configured to supply electrical energy to the controller; and an energy storage device, the energy storage device being configured to supply the controller with electrical energy when there is a loss of energy from the second energy source; wherein the motor drive system is configured to, during a braking operation, charge the energy storage device with regenerative energy from the motor.