![]() ![]() Each winding in either stator or rotor is termed a “pole” of the motor. In practice, there are more than two with an equal number in both the stator and rotor. In this simplified drawing, only two coils are depicted. This motor has coils wound around both the stator (having N 1 turns) and the rotor (having N 2 turns), which are placed in slots around the periphery in an otherwise uniform gap machine. Schematic representation of electric motor. Furthermore, we limit our discussion to linear, time-invariant models, which are sufficient to permit performance analysis appropriate for most automotive applications.įigure 6.34. Rather, we introduce basic physical structure and develop analytical models that can be applied to all rotating electromechanical machines. It is beyond the scope of this book to consider a detailed theory of all motor types. Regardless of motor configuration, each is capable of producing mechanical power due to the torque applied to the rotor by the interaction of the magnetic fields between the rotor and the stationary structure (stator) that supports the rotor along its axis of rotation. Still another distinction between types of electric motors is based upon whether the rotor receives electrical excitation from sliding mechanical switch (i.e., commutator and brush) or by induction. However, there are certain fundamental similarities between all electric motors, which are discussed below. There are a great number of electric motor types that are classified by the type of excitation (i.e., dc or ac), the physical structure (e.g., smooth air gap or salient pole), and by the type of magnet structure for the rotating element (rotor) which can be either a permanent magnet or an electromagnet. In recent times, electric motors have been used to provide the vehicle primary motive power in hybrid or electric vehicles. Motors have also been employed to raise or lower windows, position seats as well as for actuators on airflow control at idle (see Chapter 7). Electric motors have long been used on automobiles beginning with the starter motor, which uses electric power supplied by a storage battery to rotate the engine at sufficient RPM that the engine can be made to start running. Perhaps the most important electromechanical actuator in automobiles is an electric motor. Ribbens, in Understanding Automotive Electronics (Seventh Edition), 2013 Electric Motor Actuators ![]()
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