PM stepping motors

To achieve higher torque, consider models equipped with a gearbox, such as planetary gears, or types utilizing strong neodymium magnets.

Gearbox-equipped models can output significant torque depending on the reduction ratio. Additionally, high-speed types combining a bonded neodymium magnet and a silicon steel stator deliver high torque and responsiveness despite their compact size.

Their simple structure allows for a shorter axial length.

While hybrid stepping motors feature a complex three-dimensional structure sandwiching a magnet between two gear-shaped iron cores, PM types consist of a cylindrical magnet and a sheet metal frame. This facilitates a thinner profile, and we offer a lineup of thin models under 15 mm. For compact motors with an outer diameter of 10 mm or less, we also offer products under 5 mm in length.

This sudden torque drop-off is a fundamental physical limitation caused by back electromotive force (back EMF) and coil inductance, which restrict current flow at higher speeds.

As the motor’s speed increases, the motor acts like a generator, producing a reverse voltage. Overcoming this back EMF to drive current requires a higher driver power supply voltage.

Bipolar drive is generally recommended because of its superior torque efficiency, delivering the required force in a smaller footprint.

While unipolar circuits are simpler to implement, they are less efficient as they only energize half of the coil at a time. In contrast, bipolar drives utilize the entire coil, generating substantial torque even with limited battery voltage or compact motor sizes.

As of June 2026, our PM stepping motors are produced at our Lopburi plant (Thailand), Phnom Penh plant (Cambodia), Kaohsiung plant (Taiwan), Cebu plant (Philippines), and Korea plant.

This distributed, multi-site production network ensures a highly stable supply chain and supports strong Business Continuity Planning (BCP) measures for our customers.