Portable Fan Motor Drive Circuit for High-Speed Noise Control
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Solution Overview
Problem
Existing portable fans are configured with low-speed DC motors, which limit air speed, increase noise, and reduce user comfort due to high vibration and complex control logic.
Innovation Solution
A portable fan equipped with a high-speed three-phase motor and a control method that adjusts the motor's operating voltage, current, and power to reduce noise and control air speed within a preset range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a high-speed three-phase motor is used in a portable fan, then the rotation speed and power output are improved, but the manufacturing cost increases
Solution Approach 1:
The patent applies parameter changes by operating the three-phase motor at low voltage (2-18V) and current (0.1-10A) ranges, which are significantly different from traditional high-voltage industrial applications. This parameter transformation enables the use of cheaper materials and simpler manufacturing processes while maintaining high rotation speeds (tens of thousands to over 100,000 rpm), thereby reducing manufacturing costs while preserving speed performance
Solution Approach 2:
The patent effectively creates a scaled-down version of industrial three-phase motors by adapting them for portable fan applications. By copying the core three-phase motor technology but modifying it for low-power operation, the invention brings industrial-grade high-speed performance to consumer portable devices without incurring industrial manufacturing costs
2Power
If a high-speed three-phase motor is used in a portable fan, then the power output is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic control through a control module that adjusts the operating parameters (voltage, current, rotation speed) of the three-phase motor based on actual usage conditions. This dynamic adjustment enables the motor to deliver high power output when needed while consuming minimal energy during low-demand periods, resolving the contradiction between power output and power consumption
Solution Approach 2:
By changing the operating parameters to low voltage (2-18V) and current (0.1-10A) ranges, the patent achieves high power output efficiency suitable for portable applications. The controlled parameter changes ensure that the motor operates within energy-efficient boundaries while still providing sufficient power for effective cooling
3Ease of manufacture
If a DC motor is used in a portable fan, then the manufacturing cost is reduced, but the rotation speed and air speed are limited
Solution Approach 1:
The patent replaces the traditional DC motor mechanical system with a three-phase motor system. This substitution brings significant advantages in rotation speed capability (achieving tens of thousands to over 100,000 rpm compared to limited DC motor speeds) while the low-voltage operation keeps manufacturing costs manageable, thus resolving the speed limitation of DC motors
4Speed
If a high-speed three-phase motor is used in a portable fan, then the air speed is improved, but the noise increases
Solution Approach 1:
The control module dynamically adjusts the motor's rotation speed based on actual cooling requirements, enabling the system to operate at high speeds when maximum air flow is needed while transitioning to lower speeds during normal operation to minimize noise. This dynamic control resolves the contradiction between air speed performance and noise generation
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 high-speed three-phase motor provides efficient rotation speed and power output, enhancing user comfort by reducing noise and improving air speed control, while the control method ensures stable operation and energy efficiency.
Implementation Method 1
a high-speed three-phase motor... has an operating voltage of 2V to 18V and an operating current of 0.1 to 10A, and/or has a rated operating power of 0.5 to 100W
Data Source
AI summary
A portable fan configured with a high-speed three-phase motor is provided, the portable fan includes: a control module, a drive module, and the high-speed three-phase motor. The high-speed three-phase motor has an operating voltage of 2V to 18 V and an operating current of 0.1 to 10 A, and/or has a rated operating power of 0.5 to 100 W. The control module is configured to control, via the drive module and based on the operating voltage, the operating current, and/or the rated operating power, a rated operating rotation speed of the high-speed three-phase motor to reduce noise generated due to a high rotation speed of the high-speed three-phase motor and to control an air speed to be within a preset air speed range.