Technical DataCoreless Motor

What is a DC Coreless Motor?

It is a type of motor in which only the coil is wound in a cup shape without the core (iron core) in the rotor. A cylindrical magnet is placed inside the rotor.

Features of DC Coreless Motors

・Since there is no core (iron core), there is no repeated movement attracted and repulsed by the magnet, and there is no uneven rotation (cogging) and it rotates smoothly. Therefore, vibration and noise are low.

・Since the rotor is made with only a coil, it is very light and has a small moment of inertia, so it has excellent control such as responsiveness and acceleration.

・It has various merits such as low inductance of the coil, high efficiency and low current consumption, very low electrical noise, and miniaturization and quantification.

Citizen Micro DC Coreless Motors

We achieved small size and high output through excellent precision processing technology and our own winding technology (New coreless motors with φ8 have been developed for a wider range of applications from the previous φ10～24 series)

Precious metal brushes and graphite brushes can be selected (above φ13), and the precious metal brushes use our own technology for longer life.

In addition to the standard catalog products, it can be customized according to customer requirements (winding change, ball bearings, shaft length, biaxial, harness and more)

Magnetic and optical rotary encoders and various planet and spur combinations are possible.

Coreless Motor

1. ① Cap
2. ② Terminal
3. ③ Brush base
4. ④ Brush
5. ⑤ Commutator
6. ⑥ Coil
7. ⑦ Shaft
8. ⑧ Bearing
9. ⑨ Magnet
10. ⑩ Housing
11. ⑪ Bearing

Iron Core Motor

1. ① Terminal
2. ② Brush base
3. ③ Brush
4. ④ Bearing
5. ⑤ Shaft
6. ⑥ Commutator
7. ⑦ Coil
8. ⑧ Iron core
9. ⑨ Magnet
10. ⑩ Housing
11. ⑪ Bearing