--- title: "PMSM Servo HVLS Ceiling Fan" url: https://tiercooling.com/product/pmsm-servo-hvls-ceiling-fan/ date: 2026-09-07 modified: 2026-10-09 lang: en author: "info@tiercooling.com" description: "HVLS-PMSM — HVLS ceiling fan for high, open buildings — factory, warehouse, gym, farm, market and sports-hall air movement with energy-saving PMSM direct drive." image: https://tiercooling.com/wp-content/uploads/2026/09/projects-fitness-centre-hd-1024x768.jpg word_count: 926 --- # PMSM Servo HVLS Ceiling Fan This page documents the technology at the centre of every RDF HVLS fan: the **permanent-magnet synchronous servo motor with direct drive**. There is no gearbox, oil bath or belt - the six-blade rotor is the motor rotor. The result: very high drive efficiency, zero routine drivetrain maintenance and sound below 39 dB(A) across the 3.6-7.2 m range. ## Why projects specify this RDF HVLS fan - **Gearless, brushless, sealed.** The PMSM rotor carries the blade hub directly; the IP64 housing keeps dust and moisture out of a stator with a patent-protected cooling structure. - **Servo-grade vector control.** Closed-loop vector drive with IPD soft start removes the inrush and mechanical shock of direct-on-line motors; RFI filtering and overload protection are built in. - **Independent conformity assessment.** The permanent-magnet motor (model DLM 0320) was assessed by an independent laboratory against EMC 2014/30/EU (EN 61000-6 series) and LVD 2014/35/EU (EN 60204-1:2018). - **Low speed, high torque.** Servo control holds 55-90 rpm steadily even as blade load changes with door cycles or seasonal air density - the key to the gentle, non-turbulent HVLS breeze. - **No maintenance calendar.** No gear oil, brushes or belts. The controller logs faults for planned servicing rather than breakdown response. - **Patent portfolio.** Motor, rotor, stator cooling, multi-protection fan control and the IoT controller are covered by the manufacturer's Chinese utility patents. ## Technical specifications | Model | Diameter | Power supply | Current | Power | Max. speed | Max. airflow | Noise | Net weight | Coverage | | ----- | -------- | ------------ | ------- | ----- | ---------- | ------------ | ----- | ---------- | -------- | | RDF-S3600 | 3,600 mm (12 ft) | 220V/50Hz, 1-phase | 3.0 A | 0.66 kW | 90 rpm | 4,522 m3/min | <38 dB | 72 kg | O 20-24 m | | RDF-S4200 | 4,200 mm (14 ft) | 220V/50Hz, 1-phase | 3.0 A | 0.66 kW | 80 rpm | 5,306 m3/min | <38 dB | 75 kg | O 22-26 m | | RDF-S5200 | 5,200 mm (17 ft*) | 220V/50Hz, 1-phase | 3.0 A | 0.66 kW | 70 rpm | 7,065 m3/min | <39 dB | 78 kg | O 25-30 m | | RDF-B6200 | 6,200 mm (20 ft) | 220V/50Hz, 1-phase | 4.4 A | 1.3 kW | 65 rpm | 10,747 m3/min | <39 dB | 100 kg | O 32-37 m | | RDF-B6200 | 6,200 mm (20 ft) | 380V/50Hz, 3-phase | 3.0 A | 1.3 kW | 65 rpm | 10,747 m3/min | <39 dB | 100 kg | O 32-37 m | | RDF-B6700 | 6,700 mm (22 ft) | 220V/50Hz, 1-phase | 4.4 A | 1.3 kW | 60 rpm | 12,560 m3/min | <39 dB | 105 kg | O 35-40 m | | RDF-B6700 | 6,700 mm (22 ft) | 380V/50Hz, 3-phase | 3.0 A | 1.3 kW | 60 rpm | 12,560 m3/min | <39 dB | 105 kg | O 35-40 m | | RDF-H7200 | 7,200 mm (24 ft) | 220V/50Hz, 1-phase | 4.4 A | 1.3 kW | 55 rpm | 15,197 m3/min | <39 dB | 115 kg | O 38-44 m | | RDF-H7200 | 7,200 mm (24 ft) | 380V/50Hz, 3-phase | 3.0 A | 1.3 kW | 55 rpm | 15,197 m3/min | <39 dB | 115 kg | O 38-44 m | Airflow at maximum speed per the manufacturer type test; running speed is infinitely variable. The 5.2 m model's printed "14 ft" in the source brochure is a brochure typo; the manufacturer's Chinese-market spec table lists 5.2 m = 17 ft, the correct conversion. ## What direct drive changes in practice Conventional HVLS fans use a geared motor: the gearbox multiplies torque but contains oil, seals and bearings that need periodic attention several metres above the floor - often above production lines or stored goods. Eliminating the gearbox removes both the maintenance-access problem and the most common failure mode. The trade-off is a motor that must deliver high torque at very low speed, which is exactly what a PMSM servo does well. Combined with the vector controller's soft start, the fan reaches set speed smoothly, with none of the start-up sway typical of induction-motor HVLS units. ## Backed by a specialist air-treatment manufacturer - 20+ years focused on evaporative cooling and large industrial fans; National High-Tech Enterprise and CRAA-listed manufacturer. - Deputy Director Unit of the national evaporative-cooling industry committee, with 40+ patents and self-developed, patented molds. - Product liability underwritten by CPIC (policy ADNGD0207121Q000109N); type-test, protection-grade and CE motor-conformity documentation supplied with export orders. - RDF equipment is published in service with automotive, food and electronics manufacturers including SAIC-GM-Wuling, FAW-Volkswagen, GAC Toyota/Honda, PepsiCo, Foxconn, Panasonic, Gree, Midea and Haier. ## Ordering the PMSM servo HVLS ceiling fan - **MOQ:** 10 units - **Lead time:** 10 units in about 5 days; 100 units in about 20 days; 500 units in about 60 days - schedule varies by model and production plan, confirmed per order - **Trade terms:** FOB Shenzhen - **Payment:** T/T - 35% deposit, 65% balance paid before shipment - **Warranty:** 2-year warranty on the complete unit per the factory's warranty policy: motor 2 years, controller 2 years. Overseas spare-parts support (wear-parts list, quotation and dispatch lead time) is confirmed with your order. - **Documentation:** CE conformity reports for the PMSM drive motor (EMC 2014/30/EU, LVD 2014/35/EU), IP-rating report and 7.2 m type-test reports (220 V / 380 V) are available with your order. Send your floor dimensions, ceiling height and heat-load description (a sketch or photo is enough) - we reply with a model recommendation, layout and quotation within one business day via the [contact page](/contact/). ## Frequently asked questions ### What does PMSM mean and why does it matter? Permanent-Magnet Synchronous Motor. Rotor magnets remove the energised rotor windings of ordinary induction motors, cutting rotor losses; synchronous servo control holds speed exactly. In an HVLS fan that means lower kWh, no gearbox and silent, sway-free rotation. ### Is the motor certified for export markets? The DLM-series PMSM motor holds Certifications of Conformity to EU EMC 2014/30/EU and LVD 2014/35/EU (2020, independent laboratory). The complete 7.2 m fan additionally has Chinese type-test reports at 220 V and 380 V. Documents ship with orders. ### What happens if the controller trips? The controller protects motor and drive against overload, phase loss and over-temperature, showing a fault code rather than damaging hardware. Once the cause (usually supply or obstruction) is cleared, the fan restarts with soft start. Replacement controllers are plug-and-play. ### Does it work with speed controls or BMS? It ships with its own variable-speed controller; scheduled, group and building-automation control can be quoted via the IoT option BMS gateway availability and protocol details for export projects are confirmed at quotation stage. ## Related products - [Energy-Saving Industrial Ceiling Fan](/product/energy-saving-industrial-ceiling-fan/) - [7.2 m HVLS Fan (PMSM Direct-Drive)](/product/7-2m-hvls-ceiling-fan-pmsm-direct-drive/) - [Large-Diameter HVLS Ceiling Fan](/product/large-diameter-hvls-ceiling-fan/) ## More from TierCooling - [View installed project references](/projects/) - [About the manufacturer](/about/) - [All products in this category](/product-category/hvls-ceiling-fans/) ## FAQ ### What does HVLS mean? High Volume, Low Speed: large-diameter ceiling fans that move a very large air volume at low rotational speed, covering big floor areas with gentle, even airflow instead of concentrated high-speed blasts. ### Why choose a PMSM direct-drive HVLS fan? Permanent-magnet synchronous motors with direct drive run at high efficiency with fewer wearing parts than geared designs - meaning lower energy use, quieter operation and less maintenance over the fan's life. ### Which sites use HVLS ceiling fans? Typical applications include factories, warehouses, gyms and sports halls, markets and malls, playgrounds and sports fields, and livestock farms - any large space where uniform airflow and lower energy cost matter. ### How is fan size and unit count decided? Selection comes from floor area, mounting height and the obstruction layout of the site; suppliers model diameter and placement from drawings so airflow reaches working zones evenly.