3. Action model of an asynchronous machine
Three-phase asynchronous machines are distinguished by the design of the rotor, which determines the motor torque characteristic as a function of speed.
In asynchronous machines with wound rotor (figure 2 a), the rotor windings are accessible and can be connected to rings, and the resistance of the rotor circuit can be varied by inserting externally connected resistors.
In squirrel-cage machines (figure 2 b), the rotor winding is inaccessible; it consists of aluminum or copper bars, the ends of which are joined on both sides of the rotor by short-circuiting rings of the same metal.
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Action model of an asynchronous machine
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