Bicycle Motor Audio Notifications Without Separate Speakers
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Solution Overview
Problem
Existing electronic bicycle components rely on small LEDs for notifications, which are difficult to see in bright light or when the rider is not looking directly at them, and incorporating speakers or buzzers is costly and space-prohibitive.
Innovation Solution
Utilizing an electric motor on the bicycle to generate acoustic notifications by controlling it with a periodic current between 20 Hz and 20 kHz, converting DC current to AC current through an H-bridge, and alternating the motor's direction to produce sound without moving components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If small LEDs are used for notifications, then the device complexity is reduced, but the notification effectiveness deteriorates in bright light or when the rider is not looking at them
Solution Approach 1:
The motor is made multi-functional by enabling it to perform both its primary function (driving the bicycle component) and a secondary function (generating acoustic notifications). The motor can operate in different modes: normal operation for mechanical work, and notification mode when supplied with periodic current in the 20 Hz to 20 kHz range. This eliminates the need for separate notification devices while maintaining reliable audio feedback that works in all lighting conditions.
Solution Approach 2:
The motor serves itself by using its own structure and capability to generate notifications. Instead of requiring an external speaker or buzzer, the motor's existing electromagnetic structure is utilized to produce sound waves directly. The periodic current causes the motor components to vibrate and generate audible notifications, allowing the motor to provide both mechanical power and acoustic feedback functions.
2Reliability
If speakers or buzzers are incorporated for acoustic notifications, then the notification effectiveness is improved, but the device complexity and cost increase
Solution Approach 1:
The motor is made multi-functional by enabling it to perform both its primary function (driving the bicycle component) and a secondary function (generating acoustic notifications). The motor can operate in different modes: normal operation for mechanical work, and notification mode when supplied with periodic current in the 20 Hz to 20 kHz range. This eliminates the need for separate notification devices while maintaining reliable audio feedback that works in all lighting conditions.
Solution Approach 2:
The notification function is merged with the motor function. Instead of having separate components for mechanical drive and acoustic notification, the system combines these functions into a single motor unit. The motor's electromagnetic structure serves dual purposes: generating mechanical motion and producing sound waves when excited with periodic current, thereby reducing overall system complexity and component count.
3Reliability
If speakers or buzzers are incorporated for acoustic notifications, then the notification effectiveness is improved, but the cost increases
Solution Approach 1:
The solution uses the existing motor as a free resource for notification purposes. Rather than adding expensive speaker or buzzer components, the system repurposes the motor's existing structure to generate sound. The periodic current excites the motor's electromagnetic components to vibrate and produce audible notifications, eliminating the need for additional expensive notification hardware and reducing overall manufacturing costs.
4Reliability
If periodic current with frequency between 20 Hz and 20 kHz is applied to the motor, then acoustic notifications are generated, but the motor does not perform mechanical work
Solution Approach 1:
The system uses periodic action by supplying the motor with periodic current in the 20 Hz to 20 kHz frequency range. This periodic electrical input causes the motor's electromagnetic components to vibrate and generate acoustic notifications. The periodic nature of the current prevents the motor from completing full rotational cycles that would produce mechanical work, instead causing rapid oscillations that generate sound waves suitable for notifications.
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
Provides effective acoustic notifications in various scenarios without the need for additional speakers or buzzers, ensuring riders are informed of battery state, pairing status, and mode configuration even in bright conditions.
Implementation Method 1
The generation of the audio notification includes control of the current from the power source to the motor, such that a periodic current with a frequency between 20 Hz and 20 kHz is applied to the motor
Implementation Method 2
The processor is further configured to control the electronic circuitry, such that the application of the voltage of the battery is switched between the first terminal and the second terminal of the battery and the periodic current is AC current with the frequency between 20 Hz and 20 kHz
Implementation Method 3
The motor is configured to rotate in a first rotational direction and move a movable part of the bicycle in a first direction when the voltage of the battery is applied to the first terminal of the motor, and rotate in a second rotational direction and move the movable part of the bicycle in a second direction when the voltage of the battery is applied to the second terminal of the motor
Data Source
AI summary
A motorized component for a bicycle includes a motor, a power source configured to generate current for the motor, and a processor. The processor is configured to identify a state of the bicycle and, based on the identified state of the bicycle, generate an audio notification. The generation of the audio notification includes control of the current from the power source to the motor, such that a periodic current with a frequency between 20 Hz and 20 kHz is applied to the motor.