Motor Control Device for Vehicle Drive Shaft Vibration Suppression
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Solution Overview
Problem
Existing motor control methods for induction motors result in high battery power consumption and inability to effectively suppress vibration caused by drive shaft torsion, especially when starting from a steep slope or similar conditions.
Innovation Solution
A motor control device and method that adjusts the excitation current and magnetic flux in response to drive shaft torsion, channeling excitation current only when necessary to suppress vibration and optimize battery power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If excitation current is constantly channeled to improve torque responsiveness and suppress drive shaft torsion vibration, then vibration suppression is improved, but battery power consumption increases
Solution Approach 1:
The patent applies periodic action by controlling the inverter to output excitation current only during specific periods when vibration is detected, rather than continuously. The control unit monitors vibration levels and activates excitation current supply only when vibration exceeds a threshold, thereby reducing overall power consumption while maintaining effective vibration suppression when needed.
Solution Approach 2:
The patent changes the parameter of excitation current supply from constant to variable based on vibration conditions. The control unit dynamically adjusts the excitation current magnitude and timing according to detected vibration levels, optimizing the balance between vibration suppression effectiveness and power consumption by supplying current only at appropriate moments and intensities.
2Reliability
If magnetic flux is raised in conformity with lock release to suppress vibration, then vibration suppression is improved, but battery power consumption increases
Solution Approach 1:
The patent applies preliminary action by raising the magnetic flux in advance in conformity with lock release detection. When the control unit detects lock release, it proactively increases the magnetic flux before vibration occurs, preparing the system to suppress vibration effectively while minimizing the duration of high power consumption by timing the flux increase with the lock release event.
3Speed
If excitation current is channeled to improve torque command responsiveness, then torque responsiveness is improved, but battery power consumption increases
Solution Approach 1:
The patent applies periodic action by supplying excitation current intermittently based on vibration detection rather than continuously. The control unit monitors vibration conditions and activates current supply only when vibration is detected, achieving torque responsiveness improvement during vibration events while reducing overall power consumption through periodic rather than continuous 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 battery power consumption while efficiently suppressing drive shaft torsion-induced vibrations, improving torque responsiveness and vehicle safety.
Implementation Method 1
an inverter 2, which converts a voltage from the battery 1 into AC voltage and outputs the AC voltage
Implementation Method 2
a drive motor 3, which is an induction motor that rotates by use of the AC voltage to thereby transfer a torque
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A motor control device of a vehicle provided with a motor and a lock mechanism (11) for locking the rotation of vehicle wheels; wherein the motor control device comprises detection means for detecting that the lock mechanism (11) will be released, damping control means for suppressing torsional vibration of a drive shaft, and current control means for controlling current flowing to the motor on the basis of a motor torque command value set by the damping control means; and the current control means channels an excitation current for generating a magnetic flux in the motor on the basis of the detection result of the detection means.