Fan Motor Speed-Torque Mapping for Constant Air Volume
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Solution Overview
Problem
Conventional motor drive control devices for fans require complex configurations and calculations to maintain constant air volume, leading to higher costs and a need for more expensive microcontrollers.
Innovation Solution
A motor drive control device with a control circuit that stores correspondence information between rotation speed and torque, allowing for the determination of target torque and rotation speed to generate a drive control signal that maintains constant air volume using a simpler configuration and calculation, utilizing a storage unit, target torque determination unit, torque acquisition unit, target rotation speed determination unit, and drive control signal generation unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional control techniques are used to maintain constant air volume, then air volume control is achieved, but device complexity and calculation complexity increase
Solution Approach 1:
The patent transforms the control approach by changing from direct air volume control to torque-based control. By storing correspondence information between rotation speed and torque in a lookup table, the system determines target torque values based on detected rotation speed, eliminating complex real-time calculations while maintaining constant air volume through torque optimization
2Reliability
If conventional control techniques are used to maintain constant air volume, then air volume control is achieved, but calculation complexity increases
Solution Approach 1:
The patent performs preliminary calculation by pre-storing correspondence information between rotation speed and torque in a lookup table during system setup. This allows the control device to simply retrieve pre-calculated target torque values based on detected rotation speed, eliminating the need for complex real-time polynomial calculations or iterative algorithms
Solution Approach 2:
The patent replaces complex computational mechanisms with a simpler lookup-based approach. Instead of using microcontrollers to perform complex mathematical calculations in real-time, the system substitutes this with pre-computed data storage and simple retrieval operations, significantly reducing calculation complexity
Data Source
AI summary
A motor drive control device includes a control circuit to output a drive control signal for controlling the drive of a motor of a fan and a motor drive circuit to drive the motor, based on the drive control signal. The control circuit includes a storage unit to store correspondence information indicating a relationship between rotation speed and torque of the motor when the fan supplies a predetermined air volume, a target torque determination unit to determine a target torque from the rotation speed using the correspondence information corresponding to a specified target air volume, a target rotation speed determination unit to determine a target rotation speed such that a difference between the target torque and a torque value of the motor is reduced, and a drive control signal generation unit to generate the drive control signal such that the rotation speed of the motor approaches the target rotation speed.