Hybrid stepper motor with two rows of teeth on a cup-shaped rotor and a two-part stator

Abstract

Hybrid stepper motors (HSMs) are a type of stepper motor that have both a magnet and teeth on their rotors. These actuators are used in very fields including automation and robotics. Although these motors have high torque densities, improving their performance, their torque density, and their response time is very essential and useful. The most important problem in HSMs is their heavy rotor. A weightier rotor means more rotor vibrations and oscillations for each step. Therefore, in this study two motors with new rotor structures are represented. The first one has a light cup-shaped rotor which improves motor response time and decreases rotor oscillation on each step, and the second one not only has these benefits but also has increased motor torque density noticeably, which is due to one extra teeth row on its rotor that has made it two motors in one structure, indeed. Finally, the results of these improvements are compared with the conventional HSMs performance. Comparisons proved the significant superiority of these two motors over conventional HSMs.