Pulsed DC Injection Rotor Lock for Regenerative Braking
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Solution Overview
Problem
Conventional regenerative braking systems experience high current transients and power dissipation, leading to overheating, and struggle with achieving precise motor stopping positions due to nonlinear stopping behavior and the need for a constant DC power supply.
Innovation Solution
A regenerative electrical braking system incorporating a feedback loop to monitor electromagnetic field energy, utilizing pulsed DC injection rotor locking and dynamic braking techniques, which stores dissipated energy in charge storage elements and eliminates the need for a constant power supply by using kinetic energy to charge storage elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional regenerative braking systems are used, then braking function is achieved, but high current transients and power dissipation occur leading to overheating
Solution Approach 1:
The patent applies periodic pulsed DC injection to the motor windings instead of continuous braking. The controller delivers pulsed DC current at specific intervals during the braking cycle, creating periodic electromagnetic fields that maintain braking force while reducing overall power dissipation and heat generation compared to conventional continuous regenerative braking.
Solution Approach 2:
The patent changes the electrical parameters by injecting DC current into the motor windings during braking, altering the electromagnetic field characteristics. This parameter change enables the system to achieve braking while reducing current transients and power dissipation, thereby preventing overheating without sacrificing braking effectiveness.
2Manufacturing precision
If conventional regenerative braking systems are used, then braking is achieved, but precise motor stopping position cannot be achieved due to nonlinear stopping behavior
Solution Approach 1:
The patent implements a feedback mechanism where the controller monitors motor speed and braking conditions in real-time, then adjusts the pulsed DC injection timing and duration accordingly. This feedback control enables precise adjustment of the braking process, allowing the motor to stop at accurate positions despite nonlinear stopping behavior.
Solution Approach 2:
The patent employs dynamic braking control by adjusting the pulsed DC injection parameters based on real-time motor speed and load conditions. The controller dynamically modifies the braking torque profile throughout the stopping process, enabling precise position control and improving stopping behavior stability.
3Adaptability or versatility
If conventional DC injection brakes are used, then braking is achieved, but a constant DC power supply is required
Solution Approach 1:
The patent enables the motor itself to serve as the power source for DC injection during braking. The controller rectifies and stores the motor's generated electrical energy during deceleration, then uses this stored energy to power the pulsed DC injection braking process, eliminating the need for an external constant DC power supply.
Solution Approach 2:
The patent recovers the electrical energy generated by the motor during braking instead of dissipating it as heat. The controller captures this regenerative energy, stores it in capacitors, and reuses it to power the pulsed DC injection braking, thereby eliminating the need for external power supply infrastructure.
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 solution reduces the size of the braking resistor, improves nonlinear stopping characteristics, and enables precise motor control, enhancing energy efficiency and compliance while preventing overheating.
Implementation Method 1
a feedback loop to monitor electromagnetic field (EMF) energy generated by the motor
Implementation Method 2
pulsed DC injection rotor locking
Data Source
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AI summary
A regenerative braking system includes a motor (102) configured to rotate at a variable rotational speed in response to receiving power from a three-phase power supply, and a regenerative braking circuit (200) in signal communication with the three-phase power supply to control the rotational speed of the motor. A brake controller (206) is in signal communication with the regenerative braking circuit and is configured to selectively operate the regenerative braking circuit in a plurality of different braking modes based on the rotational speed of the motor.