Active Sound Generation Using Motor Vibration
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Solution Overview
Problem
Existing active sound generation technologies for vehicles require external amplifiers or separate actuators, increasing cost and weight, necessitating a solution to generate desired sounds using components already installed in the vehicle without additional hardware.
Innovation Solution
An active sound generation apparatus using a motor, which includes a target sound generating signal generator, motor controller, and radiated noise generator to control a three-phase motor installed in the vehicle, generating desired sounds through vibration without external amplifiers or actuators, utilizing components like a d-q converter, PWM controller, and radiated noise generator to adjust and amplify sound effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external amplifiers or separate actuators are added to generate desired sound, then sound generation capability is improved, but cost and weight increase
Solution Approach 1:
The motor is made to perform dual functions: its primary function of driving the load and a secondary function of generating sound through controlled vibration. By utilizing the motor's existing vibration characteristics and coupling it with a sound radiation structure, the system eliminates the need for separate sound generation actuators, thereby reducing weight while maintaining sound generation capability
Solution Approach 2:
The sound generation function is merged with the motor structure itself. The motor body and its mounting bracket are integrated to form a combined actuator-sound radiator system, where the motor's vibration is directly transferred to the mounting bracket to generate desired sound, eliminating the need for separate external amplifiers or actuators
2Reliability
If external amplifiers or separate actuators are added to generate desired sound, then sound generation capability is improved, but cost increases
Solution Approach 1:
The motor is made to perform dual functions: its primary function of driving the load and a secondary function of generating sound through controlled vibration. By utilizing the motor's existing vibration characteristics and coupling it with a sound radiation structure, the system eliminates the need for separate sound generation actuators, thereby reducing weight while maintaining sound generation capability
Solution Approach 2:
The sound generation function is merged with the motor structure itself. The motor body and its mounting bracket are integrated to form a combined actuator-sound radiator system, where the motor's vibration is directly transferred to the mounting bracket to generate desired sound, eliminating the need for separate external amplifiers or actuators
3Device complexity
If motor vibration is used to generate sound, then separate actuators are eliminated, but noise control becomes more challenging
Solution Approach 1:
The motor's vibration, which could be considered harmful noise, is converted into a beneficial sound generation mechanism. By controlling the motor's vibration characteristics and coupling it with a sound radiation structure, the system transforms what would normally be unwanted motor noise into desired audible sound output
Solution Approach 2:
The system dynamically controls the motor's operating parameters to optimize sound generation while minimizing unwanted noise. By adjusting the motor's vibration frequency and amplitude in real-time, the system can generate desired sound while suppressing harmful noise components
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
Enables the active generation of desired sounds in vehicles using existing motor components, reducing overall weight and cost by eliminating the need for external amplifiers or actuators, while effectively managing noise and optimizing sound production.
Implementation Method 1
an active sound generation apparatus using a motor for actively generating desired sound by controlling a permanent magnet synchronous motor (PMSM)
Implementation Method 2
a motor controller configured to generate a voltage command for driving the motor to generate the target sound and to control driving of the motor based on a current command signal generated by the target sound generating signal generator, actual current information of a motor, sensed by the current sensor, and a counter electromotive force compensation value of the motor
Data Source
AI summary
Disclosed is an active sound generation apparatus using a motor, the apparatus including a target sound generating signal generator configured to select the target sound and to generate a current command signal for driving the motor to generate the target sound, a current sensor configured to sense phase current of the motor, a motor controller configured to generate a voltage command for driving the motor to generate the target sound and to control driving of the motor based on a current command signal generated by the target sound generating signal generator, the phase current of the motor sensed by the current sensor, and a counter electromotive force compensation value of the motor, and a radiated noise generator configured to generate the target sound using vibration generated from the motor driven by the motor controller.