Welcome! This motor book will provide you with a wealth of information about electrical motors, how they work, what they can be used for, and so on. But before we delve into detailed explanations of the world of electrical motors, we should perhaps spare a brief thought for the purpose of these motors. After all, motors are always designed to carry out specific tasks. As this is a Grundfos publication, it is only natural that we should pay special attention to motors used for pumps – although much of the information contained within these pages will benefit all those with an interest in electrical motors.
If we start by casting our minds back in history, Archimedes discovered that water can be lifted or moved – what we call "pumping" today – by means of a rotating screw. Today, Grundfos honours this venerable pioneer of pumping in our company logo.
Rotation is an essential part of the act of pumping. This means that the motor is an essential part of any pump. Without the motor, there would be no rotation - and the water would not be moved anywhere.
The purpose of the electric motor is to create rotation – that is to convert electric energy into mechanical energy. Pumps are operated by means of mechanical energy. This energy comes from electric motors. In the process of converting energy from one kind to the other, magnetism plays a major role. In the following section we will present the basic principles of magnetism.
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