Rotor consists of silicon steel sheet or electrical pure iron bars etc magnetizer, rotor surface for tooth structure (Generated when the alveolar in rotor rotational magnetic resistance changes is called variable reluctance motor, referred to as VR)。 When stator coil current, the stator poles magnetization, attract the rotor teeth and produce torque, to make it move a step. And permanent magnet motor magnetic attraction compared to exclude torque, torque VR type produce only attract torque. Here is the VR type structure and working principle of stepper motor. Figure 2. 22 above, uniform distribution on the stator made a pole, each pole are 300, 900 (Interval of three slots)The four up a phase winding coil. Rotor teeth of 8, when one phase winding current, the stator pole attract the rotor teeth, gets minimum gap reluctance to rest position. Here, from step 1 to step 3 to illustrate the principle of work. Step 1, as diagram of the phase coil 1, section line 1 phase stator excitation, rotor attracted to 1st phase of the stator poles, the rotor teeth to the stator poles. Step 2, closing phase winding current, 1 second phase winding electricity, rotor counterclockwise step (150). Stop under, rotate to the second phase of the stator poles. Step 3, the same to the third phase winding current, rotor counterclockwise 150, also with the stator phase 3 pole position stop. Next moment, the first phase winding current and rotor position counterclockwise 15 by step 3. Under the first phase of the stator poles, return to step 1. The rotor rotate counterclockwise. This type of VR stepper motor works. If clockwise, commutation sequence is 1 phase, 3 phase, phase 2. Step at this point, from the Angle of the rotor tooth pitch, a third of the tooth pitch by phase number interval Angle, in addition to get output torque and the permanent magnet motor, its speed is directly proportional to the square of the exciting current. the main products: stepper motor, brushless motor, servo motor, stepping motor drive, brake motor, linear motor and other kinds of models of the stepper motor, welcome to inquire. Telephone:
