Flying leads means better airflow in compact fans

Hoyer now provides motors with flying leads, which means more flexibility when it comes to connections and the design of applications.

A motor with flying leads has wires that protrude from the motor housing itself, rather than being connected via a terminal box mounted on the motor. This makes it easier to fit the motor when space is limited.

Perfect for axial fans

This applies, for example, to an axial fan, where the motor and fan are located inside a pipe. In such situations, getting access to the electrical parts can be difficult for installers and service technicians. So using a motor with flying leads, which can be connected to a terminal box on the outside of the unit itself is a real advantage.

“Not only is an axial fan with a motor with flying leads easier to connect to, it also delivers improved performance and airflow because there is no large, square terminal box in the way of airflow. It also means you can have a more compact design,” said Adam Slupinski, Segment Manager – HVAC at Hoyer.

“Depending on the aerodynamic design, primarily of the impeller, significantly better performance can be achieved. We have seen examples where fan manufacturers have improved the efficiency of their fans by 5–10 percent by using flying leads,” said Adam Slupinski.

Also for ATEX and marine applications

Hoyer primarily supplies motors with flying leads for tailor-made solutions in several different industries, such as ventilation for tunnels, mining and ships, as well as fans for snow cannons.

Hoyer supplies motors with flying leads for all standard type approvals and modifications, for example low and high temperatures, ingress protection class IP66 and ATEX zone 1 and 2.

This means that the motor and fan can be configured for a wide range of needs, including:

• Motor sizes: from IEC 80 – IEC 315 (and up to IEC 355 in the near future)
• Ingress protection class: up to IP66 – can also be carried out in accordance with II 3D Ex tc IIIB T120/II 3G Ex ec IIC T3
• Cables: standard halogen-free cables and marine-approved cables for temperature resistance up to 90 degrees Celsius