Energy Retrieving Device for Motor Regenerative Energy Capture
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Solution Overview
Problem
Existing energy retrieving devices from motor systems waste regenerative energy during deceleration due to thermal consumption by regenerative resistors, rather than harnessing it effectively.
Innovation Solution
An energy retrieving device comprising a first rectifier circuit, DC link circuit, second rectifier circuit, energy retrieving unit, motor controller, and micro control unit, which detects motor deceleration signals to synchronize regenerative currents with AC phases and store energy through a PWM signal, allowing earlier energy retrieval before voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If regenerative current is consumed by regenerative resistor during motor deceleration, then motor deceleration is achieved, but energy is wasted through thermal consumption
Solution Approach 1:
The patent converts the harmful thermal consumption of regenerative current into beneficial energy storage by redirecting the regenerative current from the regenerative resistor to the DC link circuit during motor deceleration, thereby transforming wasted energy into usable energy for subsequent motor acceleration
Solution Approach 2:
The patent changes the operational parameters of the motor driving apparatus by implementing phase detection and PWM control to synchronize regenerative current with AC phases, enabling energy retrieval at optimal moments before voltage drops and maximizing energy capture efficiency
2Loss of energy
If energy retrieval is delayed until voltage drops, then system stability is maintained, but energy retrieval efficiency decreases
Solution Approach 1:
The patent performs preliminary energy retrieval by detecting motor deceleration signals and synchronizing regenerative current with AC phases before the DC link voltage drops, capturing energy at the optimal moment when regenerative current is available and voltage levels are still sufficient
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 device effectively captures and stores regenerative energy during motor deceleration, reducing energy wastage and enhancing energy efficiency by synchronizing regenerative currents with AC phases and controlling energy retrieval based on motor signals.
Implementation Method 1
a first rectifier circuit (10), connected to a power source (1), for converting three-phase AC, received from the power source (1), into DC
Implementation Method 2
a second rectifier circuit (30), connected to the DC link circuit (20) and the motor (2), for converting DC, received from the DC link circuit (20), into AC
Implementation Method 3
An energy retrieving device effectively captures and stores regenerative energy during motor deceleration, reducing energy wastage and enhancing energy efficiency by synchronizing regenerative currents with AC phases
Data Source
AI summary
An energy retrieving device includes a first rectifier circuit, a direct current (DC) link circuit, a second rectifier circuit, an energy retrieving unit, a motor controller, and a micro control unit (MCU). The MCU includes an energy retrieving control module, to control the energy retrieving unit to work according to control of a processing module. The processing module detects whether a motor deceleration signal is generated by the motor, and controls the energy retrieving control module to make the energy retrieving unit retrieve power when the motor deceleration signal is generated by the motor.