Ventilation Device Constant Air Volume Control Using Motor Parameters
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Solution Overview
Problem
Existing ventilation device systems face challenges in maintaining constant air volume due to dust accumulation, filter blocking, and varying internal static pressures, which can lead to inaccurate control and increased hardware costs when using sensors for measurement.
Innovation Solution
A method and system for constant air volume control in ventilation devices that calculates the present air volume using a selected air volume calculation formula based on the motor's rotational speed and torque, adjusting motor parameters to match the target air volume without relying on direct air volume sensors, thereby reducing costs and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If air volume sensors or static pressure sensors are installed for data collection to achieve constant air volume control, then the air volume control accuracy is improved, but the hardware cost increases and the system reliability decreases due to sensor malfunction risks
Solution Approach 1:
The patent extracts the air volume measurement function from the traditional sensor-based approach and implements it through calculation using motor parameters (rotational speed and torque) that are already available in the motor control system. This eliminates the need for separate air volume sensors while maintaining measurement capability through the calculation formula Q = f(n, T), where Q is air volume, n is rotational speed, and T is torque.
Solution Approach 2:
The patent makes the motor control system perform multiple functions: it not only controls motor operation but also measures air volume through calculation. By utilizing the existing motor sensors (for speed and torque) and the motor control unit, the system achieves both motor control and air volume measurement without requiring additional dedicated sensors, thereby improving reliability while maintaining measurement accuracy.
2Measurement precision
If air volume sensors or static pressure sensors are installed for data collection to achieve constant air volume control, then the air volume control accuracy is improved, but the hardware cost increases
Solution Approach 1:
The patent extracts the air volume measurement function from the traditional sensor-based approach and implements it through calculation using motor parameters (rotational speed and torque) that are already available in the motor control system. This eliminates the need for separate air volume sensors while maintaining measurement capability through the calculation formula Q = f(n, T), where Q is air volume, n is rotational speed, and T is torque.
Solution Approach 2:
The patent makes the motor control system perform multiple functions: it not only controls motor operation but also measures air volume through calculation. By utilizing the existing motor sensors (for speed and torque) and the motor control unit, the system achieves both motor control and air volume measurement without requiring additional dedicated sensors, thereby improving reliability while maintaining measurement accuracy.
Data Source
AI summary
A constant air volume control method includes acquiring a target air volume for a ventilation device, detecting a present rotational speed and a present torque of a motor of the ventilation device, selecting an air volume calculation formula corresponding to the target air volume according to a preset correspondence relation between air volumes and air volume calculation formulas, calculating a present air volume corresponding to the present rotational speed and the present torque, and adjusting motor parameters of the ventilation device according to a difference between the present air volume and the target air volume.