Three-Phase Motors

Our motors are designed and manufactured to meet the specific requirements of each drive task. We offer motors customized both electrically and mechanically.

For example, we supply specially made components for existing foundations or special bearings to absorb additional forces. During the electrical design phase, local grid conditions are taken into account to ensure minimal voltage drop and reliable start-up. Our portfolio includes squirrel-cage or slip-ring asynchronous motors as well as brushless or brushed synchronous motors.

Power Ranges:

• LDW produces asynchronous motors ranging from 1,000 to 35,000 kW and synchronous motors from 4,000 to 50,000 kW.

Other Motor Features:

• Three-phase motors for fixed speed with voltages up to 15 kV and power up to 35,000 kW

• Three-phase motors for variable speed via inverters, up to 10 kV and 50,000 kW

• All common designs, protection classes, and cooling types

• Special cooling methods such as liquid-jacket cooling up to 10 MW output

• Versions for hazardous areas Zone 1 and Zone 2, with pressurized housing Ex "px" and Ex "pz" ignition protection types, ATEX Directive 2014/34/EU, IECEx scheme, and IEC/EN 60079 standards. Enhanced safety Ex "e" and Ex "nA" ignition protection types are also available.

Special Features

During electrical design, we consider permissible inrush current and potential voltage drops on the grid side. Efficiency optimization is always a key part of our design approach.

Advantages

Our synchronous motors are equipped with optimally matched excitation systems, which can also provide motor protection upon customer request. This ensures high drive dynamics, reliability, and long service life. We produce three-phase motors with patented tubular housings that reduce magnetic noise and vibrations, with shaft heights up to 900 mm, eliminating the need for additional soundproofing measures. Smooth operation ensures high operational reliability for the entire drive system.

Additional Advantages:

• Custom adaptation based on grid conditions

• Compatibility with existing foundations (reinforcement if needed)

• Symmetrical ventilation of active parts and windings, ensuring homogeneous heating and extending machine life

• High-quality insulation system using VPI process for operational reliability and long service life

• Easily accessible and replaceable excitation machines for short-term stops in case of faults

• 24/7 service support from our expert team

Equipment

Our three-phase motors are durable, low-maintenance, and highly efficient, making them exceptionally effective. They are manufactured for all common protection classes and are suitable for both indoor and outdoor installation.

Machines can be equipped with various cooling systems, such as air-air or air-water coolers, and are designed for a wide range of applications. They are built to fully withstand the toughest operating and environmental conditions. In aggressive environments, the use of appropriate materials prevents increased corrosion.

We provide technical solutions for fixed-speed grid-fed motors (up to 15 kV, started via shock coil or starting transformer) and variable-speed operation (up to 50 MW at 1,500 rpm), compatible with all common inverter types and brands. LDW produces brushless excited synchronous motors as standard, but brushed versions are also available upon request.

Our experts design motor bearings for additional axial or radial loads when necessary. This also applies to three-phase motors for shipbuilding with rolling and tilting capabilities required by relevant classification societies.

All motors are designed using state-of-the-art FEM tools, and the design, construction, and production processes follow a complex and comprehensive quality control and assurance system based on our DIN ISO 9001 certification.