Siemens has for many years been one of the leading manufacturers of crane motors. This type overview covers the current range of three-phase motors for use in cranes.

The range of crane motors is aimed at crane manufacturers, system integrators, and crane operators. To make it easier to select motors, they are listed by speed and output (continuous and intermittent duty). The tables indicate the rated motor torques and the maximum permissible torques.

The asynchronous motors with the DURIGNIT 2000 winding insulation are suitable for use on the SINAMICS S120 drive system. Since the hoist motors in particular operate in a large field weakening range during converter operation, you must check – alongside the usual design criteria such as thermal load (rms torque) and maximum acceleration torque – whether the motor can still generate the required maximum torque in the field weakening range. A torque-speed diagram can be created to check this.

The requirements of the motors vary depending on the application conditions:

• Gantry cranes that are used in production halls are not usually directly subjected to climatic influences. The motors do not necessarily need high degrees of protection or special paint.
• Cranes located in seaports are often exposed to harsh weather, which means that special measures must be taken to protect the motors against corrosion as well as the ingress of dust and water.
• Cranes in steel works are often subject to very high ambient temperatures. The electrical and mechanical design (e.g. special bearings) must take this into account.