Synchronous Reluctance Fan Motor for High-Inertia Ventilation Startup
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Solution Overview
Problem
Conventional HVAC system fan devices face difficulties in starting due to high inertia, are inefficient, and require oversized, non-standard inverters to manage rotation speed, leading to increased costs.
Innovation Solution
A ventilation device utilizing a synchronous reluctance motor with a wound stator and a rotor made partially of ferromagnetic material, incorporating permanent magnets or recycled rare earth magnetic alloys to enhance performance and efficiency, reducing the need for oversized inverters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional motors are used with large impellers, then the ventilation device can handle high inertia loads, but starting becomes difficult and efficiency decreases
Solution Approach 1:
The patent changes the motor type from conventional induction motor to synchronous reluctance motor, fundamentally altering the operating parameters and magnetic field generation mechanism. This enables efficient operation with high inertia loads and improves starting capability through direct torque generation without requiring oversized inverters
Solution Approach 2:
The rotor employs a composite structure combining ferromagnetic material with permanent magnets or magnetic alloys containing recycled rare earth elements. This composite approach enhances magnetic field strength and torque production while maintaining cost-effectiveness through the use of recycled materials
2Productivity
If conventional motors with high inertia impellers are used, then the ventilation device can move large volumes of air, but the inverter must be oversized to manage the workload
Solution Approach 1:
By transitioning to a synchronous reluctance motor with optimized magnetic circuit design, the patent reduces the peak torque requirements and inertia effects, allowing the use of standard-sized inverters rather than oversized non-standard inverters, thereby simplifying the overall system
3Duration of action of stationary object
If conventional motors are used, then the ventilation device can operate continuously, but the system cost becomes particularly burdensome
Solution Approach 1:
The use of magnetic alloys containing recycled rare earth elements provides a cost-effective alternative to conventional permanent magnets, reducing material costs while maintaining the necessary magnetic properties for continuous operation
Solution Approach 2:
The synchronous reluctance motor design with optimized magnetic circuits achieves high efficiency across the operating range, reducing energy costs over time and eliminating the need for expensive oversized inverters, thereby reducing the total system cost
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 solution results in a more efficient, cost-effective, and cheaper ventilation device with improved torque ripple and power factor, facilitating easier acceleration of inertial loads and reducing inverter sizing, thereby lowering system costs.
Implementation Method 1
The rotor (3) is made at least partially of ferromagnetic material and, at least in one rotor active part (3A), comprises permanent magnets (12A, 12B) or a magnetic alloy
Implementation Method 2
stator (6) is positioned internally with respect to the rotor active part (3A)... synchronous reluctance motor
Data Source
Figure 1~4
Figure 5
Figure 6~7
AI summary
A ventilation device (1) comprising an electric motor (2) equipped with a rotor active part (3A) to which blades (4A, 4B, 4C) of a fan (5) and a stator (6) are torsionally coupled; the electric motor (2) is of the synchronous reluctance type, with a wound stator (6) which is positioned, at least partially, inside the rotor active part (3A), the rotor active part (3A) being made, at least partially, of ferromagnetic material.