The stepper motor model consists of 4 parts, which represent the base number, motor type (BIF stands for hybrid type, BC represents reactive type), number of phases, and number of motor rotor teeth.
1. Frame number: also known as the outer diameter of the motor, there are 28, 42, 57, 86, 110, 130 models.
2. Motor type
Reactive type: there is a winding on the stator and the rotor is composed of soft magnetic materials. Simple structure, low cost, small step angle, up to 1.2°, but poor dynamic performance, low efficiency, large heating, reliability is difficult to guarantee.
Permanent magnet type: The rotor of the permanent magnet stepper motor is made of permanent magnet material, and the number of poles of the rotor is the same as the number of poles of the stator. It is characterized by good dynamic performance and large output torque, but this motor has poor accuracy and large step moment angle (generally 7.5° or 15°).
Hybrid type: hybrid stepper motor combines the advantages of reactive type and permanent magnet type, with multi-phase winding on the stator, permanent magnet material on the rotor, and multiple small teeth on the rotor and stator to improve the step moment accuracy. It is characterized by large output torque, good dynamic performance and small step angle, but complex structure and relatively high cost.
3. Number of phases: the number of pairs of excitation coils that generate different polarity N and S magnetic fields. Commonly used m denotation.
4. Number of rotor teeth
The number of rotor teeth is the number of rotor small teeth on the specified rotor core. The difference in the number of rotor teeth will change the complementarity between the coils of the single phase; Changing the polarity of the flux link of the coil chain affects the harmonic component of the single-phase coil flux linkage, which in turn affects the harmonic characteristics of the motor and also affects the power density of the motor.
What are the models of stepper motor classification?
The reactive stepping is generally two-phase, the torque and volume are small, and the step angle is generally 7.5 degrees or 1.5 degrees; the permanent magnet stepping is generally three phases, which can achieve large torque output, and the stepping angle is generally 1.5 degrees, but the noise and vibration are large. In developed countries such as Europe and the United States, it has been eliminated in the 80s; Hybrid stepping refers to a combination of permanent magnet and reactive advantages. It is divided into two phases, three phases and five phases: the two-phase stepping angle is generally 1.8 degrees and the five-phase stepping angle is generally 0.72 degrees, the hybrid stepper motor with the increase of the number of phases (number of energized windings), the step angle decreases, the accuracy is improved, this stepper motor is the most widely used.
Stepper motor models are: NEMA6 (15mm×15mm), NEMA8 (20mm×20mm), NEMA10 (25mm×25mm), NEMA11 (28mm×28mm), NEMA14 (35mm×35mm), NEMA16 (39mm×39mm), NEMA17 (42mm×42mm), NEMA23 (57mm×57mm), NEMA24 (60mm×60mm), NEMA34 (86mm×86mm), NEMA42 (106mm×106mm) and other base number stepper motors.