Outer-Rotor PMSM Motor and Maintenance-Free Concept
At the core of each Frigga fan is a CorTec PMSM motor. Compared to traditional gear motor HVLS fans, this outer-rotor design provides several distinct advantages: low noise, reduced spatial requirements, no regular maintenance, and an extended service lifetime. The motor delivers high starting torque with a short start-up time and possesses strong overload capacity. Manufacturing relies on specialized winding machines and complete testing equipment within a strict quality assurance system, all aimed at keeping the motor’s internal temperature low and stable over continuous operation.
The maintenance profile is notably simple. CorTec PMSM motors require no traditional oil changes. This design removes the need for periodic lubrication, eliminates the risk of oil leaks, and avoids the associated maintenance costs over the fan’s lifetime.
Intelligent Control with Recognized Components
The Frigga fan system includes a CorTec PMSM control box that integrates Holip converters, a brand belonging to the Danfoss group, together with Schneider brand electrical appliances. This unit incorporates radio interference suppression and braking functions. For operational safety, the controller is configured with multiple alarm protections, including monitoring for ground fault, over-temperature, over-current, under-voltage, over-voltage, short circuit, and phase loss. The enclosure features a transparent observation window, allowing real‑time visual checks of the operating status. On the front panel, users will find an operating indicator light, an infinite speed adjustment knob, and a three‑speed switch for straightforward local control.
Aerodynamic Blade Design and Reinforced Structure
The shape of the fan blades is developed using blade element-momentum theory. CorTec has performed repeated design iterations to find an optimal curve and angle. Detailed blade appearance is kept confidential, with patents already applied for, and interested parties can request a preview by contacting the company directly.
Inside each blade, a distinctive structure contributes to both lightness and durability. The blade contains two connected reinforcement ribs and four unconnected reinforcement ribs. This arrangement helps resist fracture while keeping the blade mass low. At the point where the blade attaches to the plug‑in bracket, the two "E‑shaped” reinforcement ribs offer a controlled level of deformation. As the tightening force is applied from top to bottom when securing the blade, these ribs bend slightly. This compression ensures a tight connection between the plug‑in and the fan blade while preserving the structural integrity of the assembly.
Beam Connection and Safety
The part connecting the fan to the building structure receives special attention. CorTec uses an 8‑millimeter-thick plate with a specialized bend profile. The fabrication process employs robot welding technology, intended to ensure consistent safety and reliability in the finished product.
A Broad Range of Size and Performance
The Frigga family includes multiple models covering a wide span of capabilities to suit different spatial requirements. Diameters range from 2.4 meters up to 7.3 meters. Motor power ratings extend from 400 watts to 1.5 kilowatts, with both single-phase 220‑volt and three‑phase 380‑volt options available depending on the specific model. Fan weight varies from approximately 50 kilograms for the most compact variant to around 120 kilograms for the largest. Maximum rotational speed varies by size, reaching from roughly 50 rpm on the largest diameter up to 120 rpm on the smallest. The corresponding air volume capacities range from approximately 6,800 cubic meters per minute up to around 16,000 cubic meters per minute. Across the entire series, the noise level is consistently rated at around 43 dBA.
CFD Service for Project Planning
For clients or large projects, CorTec can provide wind flow simulation using Computational Fluid Dynamics (CFD). This service requires the provision of 3D drawings of the project. Based on the simulation, CorTec engineers will select the appropriate fan size and calculate the required number of units, aiming to achieve the most suitable ventilation effect while keeping the solution economical.
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By integrating a maintenance‑free outer‑rotor PMSM motor, a controller with recognized components, aerodynamically optimized blades, and a robust beam connection, the Frigga HVLS fan series offers a dependable option for large‑scale air movement. For more specific details about the fan models or to explore CFD analysis for a project, contacting CorTec directly is recommended.
