Brushless Motor Speed Control Using Temperature and Clock Signals
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Solution Overview
Problem
Existing methods for controlling brushless direct current motor rotation speed in cooling fans are either energy inefficient, inflexible, or reactive, as they rely solely on fixed speeds, clock signals, or temperature feedback, failing to provide proactive and efficient speed regulation.
Innovation Solution
A motor rotation speed control system that utilizes both environmental temperature and clock signals to regulate the speed of a brushless direct current motor, employing a pulse generating circuit with temperature and clock signal processing circuits to generate a control pulse signal with a duty cycle linearly related to both inputs, allowing for adaptive speed control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed speed control is used, then the motor operates continuously at maximum power, but this causes energy inefficiency and excessive noise
Solution Approach 1:
The patent implements dynamic speed control by transitioning from fixed speed to variable speed operation. The motor speed is dynamically adjusted based on real-time temperature feedback from the monitored component, allowing the system to adapt its power consumption to actual cooling requirements rather than operating continuously at maximum power.
Solution Approach 2:
The patent employs temperature feedback control where a temperature sensor continuously monitors the component temperature and feeds this information back to the control circuit. The control circuit then adjusts the motor speed accordingly, creating a closed-loop system that optimizes energy consumption while maintaining reliable cooling when needed.
2Use of energy by moving object
If variable speed control by PWM signal is used, then energy efficiency is improved, but the control flexibility and adaptability to temperature conditions are insufficient
Solution Approach 1:
The patent enhances PWM control by adding temperature feedback. The control circuit receives both the PWM signal and temperature sensor input, then dynamically adjusts the motor speed based on actual temperature conditions. This combines the energy efficiency of PWM with the adaptability of feedback control, allowing the system to respond to real-time thermal conditions while maintaining low power consumption during normal operation.
3Use of energy by moving object
If variable speed control by temperature feedback alone is used, then energy efficiency and noise reduction are achieved, but the control is reactive rather than proactive, causing delayed cooling response
Solution Approach 1:
The patent implements preliminary action by using the PWM signal to proactively control motor speed based on anticipated cooling requirements, while the temperature feedback provides reactive adjustment. The control circuit processes both signals to determine motor speed before temperature critical thresholds are reached, combining proactive PWM-based control with reactive temperature-based adjustment to reduce both power consumption and response delay.
4Use of energy by moving object
If temperature feedback control is used, then the fan speed adjusts to reduce power consumption and noise, but the control system becomes overly complex
Solution Approach 1:
The patent merges PWM signal processing with temperature feedback processing in a unified control circuit. The control circuit integrates both input signals to generate the motor speed control signal, combining the advantages of both control methods while avoiding the need for separate, complex control systems. This integration reduces overall system complexity while maintaining the energy efficiency and adaptability benefits.
Data Source
AI summary
The present invention relates to a system and method controlling motor rotation speed and provides a cooling system and method configured to control a temperature associated with an integrated circuit. The cooling system includes a brushless motor, a temperature monitoring input, a clock input, and a motor controller. The motor controller is configured to control the rotational speed of the motor using at least a speed control method by comparing the environmental temperature signal to a predetermined threshold: if the environmental temperature signal is less than the predetermined threshold T1 or higher than T2, controlling the rotational speed of the motor uses the speed control method and only one of the environmental temperature signal and the clock signal; and if the environmental temperature signal is greater than the predetermined threshold T1 and less than T2, controlling the rotational speed of the motor uses the speed control method and both of the environmental temperature signal and the clock signal.