These are used to obtain smaller step sizes, typically in the range of 2˚ to 15˚. The width of the rotor teeth should be equal to the width of stator teeth. The number rotor poles should not be equal to the number of stator poles to have self starting capability and bi-directional rotation. The rotor is also made up of silicon steel stamping s with outward projected poles and it does not have any electrical winding. The combination of two coils is known as phase winding. The two coils are connected such that their MMF get added. In case of even number of poles the exciting coils of opposite poles are connected in series. Each and every stator pole carries a field coil or exciting coil. The stator is made up of silicon steel stamping s with inward projected even or odd number of poles or teeth (usually the number of poles of stator is an even number). The construction of a 3-phase VR stepper motor is shown in figure. The VR stepper motor is characterized by the fact that there is no permanent magnet either on the rotor or the stator.
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