Motor Driver Waveform Switching for Heat and Noise
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Solution Overview
Problem
Current motor driving systems are inadequate in efficiently managing heat dissipation and noise levels across varying speed requirements, as common waveform patterns fail to simultaneously achieve low noise at low speeds and high heat dissipation at high speeds.
Innovation Solution
A system comprising a lookup table module, command detector, and motor driver that stores and selects between reference and modulated waveform patterns based on rotating speed commands, switching between sinusoidal/third harmonic waveforms for low noise and trapezoidal/square waveforms for high speed to enhance heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the motor is driven to rotate at high speed to meet maximum heat dissipation requirement, then heat dissipation efficiency is improved, but noise level increases due to blade cutting into air
Solution Approach 1:
The patent applies dynamics by making the waveform pattern adjustable based on operating conditions. The motor driver device dynamically switches between different waveform patterns (sinusoidal, third harmonic, square wave) depending on the duty cycle threshold, allowing the system to adapt to varying speed and noise requirements while maintaining optimal heat dissipation performance.
2Object-generated harmful factors
If the motor is driven to rotate at low speed to meet minimum heat dissipation and low noise requirements, then noise level is reduced, but heat dissipation efficiency decreases
Solution Approach 1:
The patent applies parameter changes by modifying the waveform pattern parameters based on the duty cycle. When the duty cycle exceeds a predetermined threshold, the system switches from low-amplitude sinusoidal or third harmonic waveforms to high-amplitude square wave patterns, thereby changing the motor's operating characteristics to achieve both low noise and adequate heat dissipation.
3Device complexity
If common driving waveform patterns are used, then device complexity is reduced, but the ability to simultaneously achieve low noise at low speeds and high heat dissipation at high speeds is lost
Solution Approach 1:
The patent applies segmentation by dividing the waveform patterns into distinct segments stored in separate memory locations. The lookup table is segmented to store different waveform patterns (sinusoidal, third harmonic, square wave) that can be selectively accessed based on the duty cycle threshold, allowing the system to maintain low complexity while achieving versatile performance optimization across different operating conditions.
Data Source
AI summary
A system and a method for driving a motor to rotate at a high speed are provided. The system includes a lookup table, a command detector, a pattern selector and a motor driver. The lookup table module is configured to store a reference waveform pattern and a modulated waveform pattern. An amplitude of the modulated waveform pattern is larger than an amplitude of the reference waveform pattern. The command detector is configured to receive a rotating speed command. The pattern selector is configured to receive the reference waveform pattern and the modulated waveform pattern, and select the reference waveform pattern or the modulated waveform pattern according to the rotating speed command. The motor driver is configured to output a driving signal to drive the motor according to the selected reference waveform pattern or modulated waveform pattern.