Electric motors operate on the principle of using the magnetic field force effects. In layman’s terms, this principle can be explained by the use of mutual attraction and repulsion of electromagnets or the attraction of electromagnets and iron. The polarity and strength of the electromagnet can be controlled by the magnitude of the current flowing into it. The electric motor has three modes of operation or modes: motor, generator and brake mode. In practice, it is possible to replace medium voltage electric motors in three variants.
Medium voltage motors and practical tips
The first is that the original motor is left, but the application will be extended with a high-voltage frequency converter. As a clear advantage we will mention the retention of the original engine and the possibility of using any backup engines. Another advantage of such applications is the original cables. The disadvantage is that in some cases we can talk about higher cost demands and this also applies to subsequent operation. Older engines may also show lower efficiency. The second option is again to keep the original medium voltage electric motors, but it is necessary to provide a new low-voltage converter with increasing transformer. The advantages mentioned in the first method also apply here, but there are others. In such a way of exchange it is also possible to use very long cables and in specific numbers we can talk about a few kilometers. Moreover, such a solution is characterized by lower cost demands. However, the possible low efficiency of the motor is a disadvantage here and the efficiency may be lower by the losses on the transformer. The third way to replace medium voltage motors is to simply replace them with a low voltage motor and a low voltage frequency converter. The advantages of such a solution are unambiguous and we can speak in particular about high efficiency, low operating costs and the lowest price of all the above mentioned methods.
What is the difference between low, high or medium voltage electric motor?
There can be different ideas about what qualifies as a low, high or medium electric voltage motor. “Some people consider anything above 1000 V as high voltage. The limits are clearly defined, however, in the IEC 60038 standard: low voltage is up to 1000 V, medium voltage is from 1000 V to 35 kV, and high voltage is over 35 kV.
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