Brushless Motor Stabilizer Control Reducing Torque Fluctuations
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Solution Overview
Problem
Existing stabilizer control devices with brushless motors experience torque fluctuations and noise when switching the rotating direction, which affect the reduction of rolling movement and stability in vehicles.
Innovation Solution
A stabilizer control device with a brushless motor, rotating direction switching elements, and an excitation control system that adjusts the power supplied to the exciting coil based on vehicle and motor states to minimize torque fluctuations and noise, utilizing a brake mode to control the switching elements and reduce rolling movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the rotating direction of the brushless motor is switched by changing the phase switching signal pattern, then the stabilizer can be controlled to reduce rolling movement, but torque fluctuations and noise are generated
Solution Approach 1:
The control device determines whether to switch rotating direction before actually switching, checking if the absolute value of the output torque would exceed the threshold. This preliminary check prevents harmful torque fluctuations from occurring in the first place, rather than trying to mitigate them after they occur.
Solution Approach 2:
The control device continuously monitors the output torque of the brushless motor and uses this feedback to determine whether to allow rotating direction switching. By comparing the absolute value of the output torque against a threshold, the system dynamically adjusts switching behavior to prevent torque fluctuations and noise while maintaining effective stabilizer control.
2Device complexity
If the brushless motor is used to control the stabilizer, then the device complexity is reduced compared to electromagnetic actuators, but torque fluctuations occur during direction switching
Solution Approach 1:
The control device uses feedback from the output torque sensor to dynamically control rotating direction switching. By monitoring the absolute value of the output torque and comparing it to a threshold, the system ensures that direction switching only occurs when torque stability is maintained, thus preserving reliability while using the simpler brushless motor structure.
Solution Approach 2:
The control strategy dynamically adjusts the permission for rotating direction switching based on real-time torque conditions. The control device changes the switching behavior adaptively - allowing switching when torque is within acceptable ranges and preventing switching when it would cause fluctuations - thus maintaining torque stability throughout operation.
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 reduces torque fluctuations and noise, allowing for smoother control of rolling movement and improved stability in vehicles by adjusting the power supply and switching patterns in response to vehicle and motor states.
Implementation Method 1
a brushless motor provided between the first torsion bar and the second torsion bar and having an exciting coil, the brushless motor rotating in accordance with an excited state of the exciting coil
Data Source
AI summary
A stabilizer control device includes a stabilizer having torsion bars and a brushless motor having an exciting coil, a rotating direction switching device switching a rotating direction of the brushless motor, an excitation control device for controlling power supplied to the exciting coil, a vehicle state detecting device, a rotating state detecting device, a roll control device for reducing a rolling movement of the vehicle, a brake mode by which all the switching elements of one of the first switching element group and the second switching element group are controlled to be in a conducting state, and all the switching elements of the other of the first switching element group and the second switching element group are controlled to be in a non-conducting state; and a brake mode executing device for executing the brake mode in accordance with the state of the roll control device.