Electric motor 355 kW, 990 rpm, 400 V / 690 V, H17RL 355X2-6 LV

A standard industrial motor is often enough for simple operation, but under continuous load, frequent starts and voltage fluctuations, the difference becomes apparent very quickly. The H17RL 355X2-6 was designed precisely for these conditions, to bring greater reliability to production operation in the 900-1000 rpm range and help keep the technology running steadily even where the drive is expected to deliver more than just basic performance. In the VYBO Electric portfolio, this is a solution for businesses dealing with modernisation, drive replacement or new lines with an emphasis on long-term operational certainty.

From a design perspective, it is built on a strong cast-iron frame, which supports the robustness of the assembly and suitably complements the requirements for a long service life in demanding environments. The 355 mm frame size allows robust mounting of the power section, and the motor can be adapted to the environment with available IP56, IP65, IP66 and IP67 enclosures. Electric motors in this series are intended for heavy industry and belong to the Heavy Duty process performance class, so they are suitable for operations where durability under long-term load is crucial. At the same time, these are products developed and manufactured specifically for European industry, especially for Western Europe, which is important in projects with strict requirements for integration into existing infrastructure.

Electric motor 400 V / 690 V for the 900-1000 rpm range

The electrical section is sized for supply conditions that are common in industry at higher power ratings. The electric motor 400 V / 690 V achieves a rated current of △ 400V 629 A and a rated current of Y 690V 365 A, while the rated torque of 3424 Nm provides reserve for process peaks and the starting of units with higher inertia. In operation within the 900-1000 rpm speed range, efficiency of 96.1 percent and a power factor of 0.85 are also important, helping to reduce losses in long production cycles. For drives for demanding applications, such a combination of values is particularly practical when designing energy efficient lines.

• The H17RL 355X2-6 operates with a rated speed of 990 rpm, so it is an excellent fit as an electric motor for low-speed applications.
• A starting torque ratio of 130 percent supports smooth start-up of conveyor and process systems.
• A breakdown torque ratio of 200 percent gives the motor room during short-term overloads.
• A starting current ratio of 650 percent must be taken into account when designing protection and distribution equipment.

Construction and standard equipment for heavy industry

The standard equipment includes a steel fan cover for better protection of the cooling section, reinforced bearings protected by a steel cover, grease resistant to high temperatures, a metal terminal box with a more robust design and reinforced bearing end shields for greater mechanical resistance. The DE 6322C3 bearing and the NDE 6222C3 bearing are selected with regard to load and maintenance practice in operations where predictable servicing is important. The rotor cage is a massive aluminium cage, which supports reliable transmission of torque during heavy starts. In this context, the motor is also suitable as a three-phase motor 400/690 V for process units with a higher operating load.

For energy design, the power rating of 355 kW is also important and should be assessed together with the moment of inertia GD² 41.6 kg·m², external starting inertia 349 kg·m² and a weight of 2650 kg. Such an assembly provides stable behaviour when starting large machines, where control of both mechanical and electrical load is required. Insulation class F in combination with temperature rise B supports longer operation under standard industrial conditions and helps maintain a reserve even under higher thermal stress.

Precise deployment in operations requiring the 900-1000 rpm range

This electric motor 400 V / 690 V is used where stable performance, controlled maintenance and compatibility with low-voltage infrastructure are expected. In practice, this means deployment in mixing equipment for cement plants, screw conveyors for bulk materials, process water pumps, technology extraction fans, extruders for plastics production lines, crushers for mineral raw materials and roller mills in material processing. For these segments, the option to add accessories is also important if the project requires thermal protection via 6x PT100 in the winding, PT100 in the DE and NDE bearing, anti-condensation heating and 3x PTC. This makes it possible to adapt the motor more effectively to real operation and the company’s service standards.

For this type of solution, VYBO Electric relies on its own development, premium materials and experience with deliveries for sales worldwide, which is a practical factor in international projects. If you need to verify the compatibility of starting, mechanical load and temperature regime for your production technology, send us an enquiry and we will recommend the most suitable technical design for your project.

Technical support for drive modernisation in the 900-1000 rpm range

When modernising existing lines, it is not only the rated power that matters, but also the motor’s ability to fit into the mechanical concept, switchgear and service plan. The H17RL Compact PRO is therefore suitable for technology suppliers, manufacturing plants and industrial businesses that need to replace an older unit without compromising reliability. The combination of robust construction, efficient cooling and enclosure customisation options gives the project greater flexibility in design and later maintenance.

Thanks to its parameters, this model is a practical solution for drives for demanding applications where not only performance is monitored, but also operational stability, thermal reserve and easier integration into the production technology. If the priority is an electric motor for low-speed applications that are to operate long term and under controlled load, the H17RL 355X2-6 is among the solutions that make sense from both a technical design and total operating cost perspective.