Electromagnetic Damper Coil Short-Circuit for Energy Saving
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Solution Overview
Problem
Electromagnetic dampers face challenges in maintaining oscillation damping force when the vehicle is stopped, as continuous power supply is required, leading to rapid energy consumption and difficulty in damping vehicle body changes due to load variations, and they struggle to function during anomalies or specific vehicle states like starting and deceleration without consuming power.
Innovation Solution
An electromagnetic damper with an electrical circuit that short-circuits the motor coil when power is interrupted, allowing the motor to generate counter-electromotive force and provide damping without external energy, and includes variable resistors to adjust damping force based on vehicle states, ensuring ride comfort and stability without continuous power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous power is supplied to the motor from the power source, then the electromagnetic damper can maintain oscillation damping force, but energy is consumed quickly
Solution Approach 1:
The patent applies periodic action by switching the power supply to the motor on and off based on vehicle operating conditions. The control unit determines whether to supply power based on vehicle speed and acceleration conditions, providing power only during periods when damping is most needed (during motion) and cutting power during periods when damping is less critical (at rest or steady state), thus achieving periodic power supply that maintains damping effectiveness while reducing overall energy consumption
Solution Approach 2:
The patent implements self-service by using the motor's back-EMF (counter-electromotive force) generation capability during vehicle deceleration or regenerative braking conditions. When the vehicle is decelerating, the motor automatically generates electrical energy through electromagnetic induction, which can be fed back to the power source or used to maintain damping force without additional energy consumption from the battery, allowing the system to serve itself during specific operating conditions
2Use of energy by moving object
If power supply from the power source to the motor is stopped while the vehicle is stopped, then energy consumption is reduced, but it becomes difficult to damp the oscillation of the vehicle body
Solution Approach 1:
The patent applies preliminary action by pre-setting the control unit with decision logic that evaluates vehicle conditions (speed, acceleration, operating state) before determining whether to supply power. The control unit proactively decides to maintain power supply during conditions where damping is critical (vehicle moving, accelerating, or decelerating) and stops power only when the vehicle is completely stopped and stable, thus preparing the system in advance to maintain damping capability when needed while avoiding unnecessary energy consumption
3Use of energy by moving object
If the coil is short-circuited when power is interrupted, then the motor functions as a power generator and causes counter-electromotive force, but the electrical circuit complexity increases
Solution Approach 1:
The patent applies universality by designing the motor to serve multiple functions: it acts as a motor when power is supplied to generate damping force, and automatically functions as a generator when power is interrupted and the coil is short-circuited, producing back-EMF that can be used for energy recovery or maintained damping. This multi-functionality allows the same component to provide energy saving benefits without requiring separate dedicated components for each function, thereby limiting the increase in overall system complexity
Solution Approach 2:
The patent uses the control unit as an intermediary that manages the switching between power supply and coil short-circuiting modes. The control unit intermediates between the power source and the motor coil, intelligently deciding when to connect the coil to the power source and when to short-circuit it based on vehicle conditions. This intermediary control mechanism automates the complex switching decisions, reducing the need for complex manual circuit design while achieving energy saving through coordinated power management
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 enables efficient energy saving by generating damping force without power supply, maintaining ride comfort and stability during vehicle stops, starts, and decelerations, and allows for adjustable damping force based on vehicle conditions, optimizing power usage and performance.
Implementation Method 1
when torque is added to an output shaft of the motor as input torque, the motor functions as a power generator, and causes torque in the direction opposite the input torque or causes counter-electromotive force
Data Source
AI summary
An electromagnetic damper is attached to a vehicle and causes oscillation damping force using a motor driven with energy from a power source. The electromagnetic damper includes an electrical circuit that causes a coil of the motor to be short-circuited in a state where the energy from the power source to the motor is interrupted.