High Voltage Slip Ring Motors
Medium high voltage slip ring motors are used to drive many different machinery in mining, machine tools, transportation and power plants, among others. These motors can be asynchronous or synchronous AC, single-phase or three-phase and have a variety of power ratings. They can also have a variety of bearing types and degrees of protection, depending on the motor’s application and power rating.
Electric medium,high voltage slip ring motors convert electrical energy into mechanical energy by the force of magnetic fields. This is due to the Lorentz force between two opposing sets of current-carrying magnetic poles, one caused by a field magnet (also called a permanent magnet) and the other by an armature coil. During operation, the field magnet induces current in the armature coils, which causes them to produce their own magnetic poles, thereby creating the necessary force to turn the rotor. This creates mechanical energy, which is converted into a mechanical output by the rotor shaft.
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The magnetic field strength generated by the armature coils is proportional to their current density, and therefore the motor’s maximum torque is directly proportional to its speed. However, motor losses reduce the efficiency of the motor and decrease its ability to produce a constant torque at a given speed. The main motor losses are resistive losses in windings, core losses in the rotor and mechanical losses in the bearings. Furthermore, losses due to commutation (electronic or mechanical) and friction (between the brushes and the rotor) are dissipated as heat.
Medium High Voltage Slip Ring Motors
A key element in the design of a DC motor is the commutator. The commutator is a rotary electrical switch that periodically reverses the direction of current in the rotor’s windings as it rotates. This is done to overcome the inefficiency of the iron core and to eliminate cogging, which is caused by the magnetic field changing from one state to another.
An ironless DC motor is a type of electric motor that has no core and relies solely on the magnetic attraction between its rotor and the field magnet for its rotation. As a result, ironless motors are able to produce more power at higher speeds than conventional motors. However, the lack of a magnetic core means that they cannot be started with a starter, and they can experience high inertial load loss.
Siemens’ range of medium voltage slip ring motors provide sound technology for demanding industrial applications such as mill drives, cement and mining. They are available in a wide range of frame sizes and powers and are suitable for use in all applications where heavy loads have to be moved or work carried out, such as compressors, pumps, blowers and winches. Their robust construction, modular construction and wide variety of accessories allow for a flexible system solution. These motors are optimized for low power losses and easy maintenance, allowing you to extend the life of your equipment and increase the availability of your plant. The motors can be used with various types of power inverters, variable-speed control drives or electronic commutator technologies.