What is the specific structure of a stepper motor?

The specific structure of a stepper motor includes the following parts:
1. Stator and rotor core: They are both made of laminated silicon steel sheets. There are six magnetic poles on the stator, and the same phase winding is wound on each two opposite magnetic poles. These three-phase windings are usually connected in a star configuration and used as control windings.
2. Rotor core: There is no winding on the rotor core, only four teeth, and the width of these teeth is equal to the width of the stator pole shoe.
Due to the wide range of applications of stepper motors, research on their control is also becoming more and more in-depth. During startup or acceleration, if the speed of the step pulse changes too fast, the rotor may not be able to keep up with the change of the electrical signal due to inertia, resulting in stalling or loss of step. During stopping or deceleration, superstepping may also occur due to the rapid change of the pulse. In order to prevent these phenomena and increase the operating frequency, it is necessary to implement speed control of the stepper motor.
The stable synchronous state of the stepper motor is achieved when the control pulse frequency remains constant. In this state, the rotor rotates at a constant speed, which can also be considered to fluctuate periodically relative to the synchronous speed. This state can be further subdivided into the extreme synchronous state and the non-extreme synchronous state.
1. Extreme synchronous state: The maximum pulse frequency f_max of the motor output shaft under a certain load and the corresponding maximum speed n_max of the rotor define the extreme synchronous state. In this state, the rotor actually rotates in a uniform and wobble-free manner, which usually requires a specific starting procedure to achieve.
2. Non-extreme synchronous state: When the pulse frequency is lower than f_max, the motor is in a non-extreme stable state. In this state, the movement of the rotor may contain stable wobble, especially in the resonant frequency area, which may be particularly dangerous.