The new production technologies require electrical drives to be able to operate under the mode of starting, operation, speed control and stabilization, accurate braking and positioning. When designing them, there are extensively applied not only the rotational electric motors, but also the linear induction motors (LIM). To this group there are attached the arc, drum and flat motors, motors with a disk rotor or segment stator as well as motors having two or more disk-type or hollow type rotors. The specific structural characteristic of such motors is the open magnetic circuit.
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