Electric Actuator Motion Conversion With Capacitor Regeneration
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Solution Overview
Problem
Conventional electric vehicles only regenerate electric power during inertial driving and braking, leaving room for improvement in power-saving performance.
Innovation Solution
An electric actuator comprising an electric motor, a drive device that outputs a first rotary motion using power from a capacitor, and a motion converter that converts this motion into a unidirectional rotary motion, allowing for efficient regenerative power generation and reuse by alternating forward and reverse rotations of the motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If regenerative power generation is only performed during inertial driving and braking, then the system structure remains simple, but power-saving performance is insufficient
Solution Approach 1:
The electric motor performs periodic forward and reverse rotations to enable regenerative power generation during both acceleration and deceleration phases, rather than only during inertial driving and braking. This periodic bidirectional operation allows the system to recover energy continuously throughout the operating cycle, significantly improving power-saving performance without requiring fundamental structural changes
Solution Approach 2:
The electric motor serves dual functions: it acts as both a drive motor during acceleration and as a generator during deceleration. By utilizing the motor's own rotational motion to generate regenerative power, the system eliminates the need for separate dedicated regenerative components, thereby improving energy efficiency while maintaining relatively simple system architecture
2Loss of energy
If the electric motor repeats forward and reverse rotation for regenerative power generation, then energy saving rate increases to over 70%, but the control system complexity increases
Solution Approach 1:
The control system implements periodic forward and reverse rotation cycles of the electric motor. By systematically alternating between forward acceleration (power consumption) and reverse deceleration (power generation) phases, the system achieves energy saving rates exceeding 70%. The periodic nature of this control strategy allows for predictable energy management while maintaining manageable control complexity through established motor control algorithms
3Use of energy by moving object
If regenerative power is supplied to capacitor for repeated use, then power consumption decreases significantly, but the energy storage and management system becomes more complex
Solution Approach 1:
The capacitor serves as an energy buffer that stores regenerative power during deceleration phases and supplies it during acceleration phases. This feedback mechanism creates a closed-loop energy management system where excess energy is captured and reused, reducing overall power consumption by over 70%. The capacitor-based approach provides a relatively simple energy storage solution compared to battery systems, as it only requires handling transient energy fluctuations rather than large-scale energy storage
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 electric actuator achieves significant energy savings by efficiently utilizing regenerative power, reducing electric power consumption by over 70% at frequencies below 200 Hz, with energy saving rates exceeding 90% in low frequency ranges.
Implementation Method 1
Regenerative electric power generated in the electric motor by the electric motor repeating the forward rotation and the reverse rotation is supplied to the capacitor
Implementation Method 2
a drive device that drives the electric motor to output a first rotary motion using power accumulated in a capacitor
Data Source
AI summary
An electric actuator includes an electric motor, a drive device that drives the electric motor to output a first rotary motion using power accumulated in a capacitor, and a motion converter that is coupled to the electric motor and converts the first rotary motion into a second rotary motion. The first rotary motion is forward and reverse rotary motions that are output by the electric motor as the drive device drives the electric motor to repeat forward rotation and reverse rotation. The second rotary motion is a unidirectional rotary motion. Regenerative electric power generated in the electric motor by the electric motor repeating the forward rotation and the reverse rotation is supplied to the capacitor.