Electric Actuator Driver Motor Generator Transient Current
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Solution Overview
Problem
Conventional electric actuator drivers for spacecraft face challenges with high deceleration ratios, leading to increased inertial load, high instantaneous current consumption during acceleration, and regenerative current issues, resulting in a large and heavy power supply unit with voltage fluctuations.
Innovation Solution
An electric actuator driver incorporating a motor generator that rotates to supply instantaneous current during acceleration and deceleration, reducing the system's size and weight by converting electric energy into mechanical energy and back, thus managing transient high currents efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electric actuator has a high deceleration ratio, then the power transmission efficiency is improved, but the inertial load and consumption current during acceleration increase
Solution Approach 1:
The motor generator is operated in periodic cycles: during normal operation it functions as a motor driving the actuator, and during acceleration/deceleration phases it functions as a generator to recover energy. This periodic switching between motor and generator modes allows the system to maintain high deceleration ratio benefits while managing peak current demands through energy recovery during braking phases.
2Speed
If the power supply unit is designed to respond to transient high instantaneous current, then the acceleration performance is improved, but the size and weight of the power supply unit increase
Solution Approach 1:
The motor generator serves dual functions: it acts as a motor during normal operation and as a generator during acceleration and deceleration to supply instantaneous current and recover energy. This self-service capability eliminates the need for a separate large-capacity power supply unit, as the motor generator itself provides the necessary current bursts during high-demand phases.
3Reliability
If a large power supply unit is used to handle regenerative current, then the reliability is improved, but the device complexity and size increase
Solution Approach 1:
The motor generator is merged with the drive system, combining motor and generator functions in a single integrated component. This eliminates the need for separate power supply units and complex regenerative braking systems, as the same motor generator handles both propulsion and energy recovery, simplifying the overall system architecture while maintaining reliability.
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 effectively responds to transient high instantaneous currents, reduces the driver's size and weight, and enhances power supply resilience by minimizing the need for large capacitors or batteries, resulting in a more compact and environmentally resistant system.
Implementation Method 1
a motor generator (50) to drive the electric actuator (10); wherein the electric actuator driver (A1) further comprises: a motor generator driving means (C8) to rotate the motor generator (50) at a rotation speed with which the motor generator (50) supplies an instantaneous current which is consumption current of a power supply and regenerative current during acceleration / deceleration
Data Source
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AI summary
The present invention aims to respond a transient high instantaneous current that flows during acceleration of an electric actuator as well as to reduce the size and weight. The present invention is an electric actuator driver, including: an electric actuator (10); a motor generator (50) to drive the electric actuator (10); and a motor generator driving means (C8) to rotate the motor generator (50) at a rotation speed with which the motor generator (50) supplies a high instantaneous current that flows during acceleration / deceleration of the electric actuator (10).