DC Coreless Motor
DC Coreless Motor
DC Coreless Motor
DC Coreless Motor
DC Coreless Motor
DC Coreless Motor
DC Coreless Motor
DC Coreless Motor

DC Coreless Motor Claimed

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Since the development of the world’s smallest φ10 mm DC coreless motor in 1973, Namiki motors have been a major player in the Japanese market.

We are a pioneer of DC coreless motors and micro motors (ultra small motors).

In 1973, we developed the world’s smallest φ10mm DC coreless motor by introducing a patent for coreless windings from Germany.

In 1973, we introduced a patent for coreless windings from Germany and developed the world’s smallest φ0.6 mm DC coreless motor. Nowadays, our motors are used in various applications around the world, including medical equipment, optical equipment, industrial equipment, small robots, and RC servos.

What is a DC coreless motor?

There are three major advantages of DC coreless motors.

Since the copper wire cage-shaped rotor is light, the moment of inertia is small and therefore quick response is possible.

Since there is no iron core in the rotor, there is no cogging due to the absence of permanent magnet action, which means smooth rotation and reduced vibration and noise.

The use of rare-earth magnets with high magnetic properties and the rotor being made up of coils only enables the motor to be made smaller and lighter.

What is coreless winding?

The unique feature of Namiki DC coreless motors is the coreless winding. In terms of winding technology, we have developed our own winding machine to achieve high precision layered winding to improve the occupancy factor. This in-house developed winding machine enables us to achieve higher torque constant, lower current consumption, and higher torque. In addition, the well-balanced coreless winding enables smooth magnetic cogging-free rotation, low moment of inertia, and miniaturization. What makes it possible to produce motors with an outer diameter of less than 1 mm is our coreless winding know-how using ultra-fine wires and our winding machine technology.

Namiki DC Coreless Motor Features

Both Namiki brushed and brushless motors are coreless. Compared to the coreless motor, the Namiki motor has far less cogging, a faster response time, a higher torque constant, and quieter operation. Another feature of the Namiki motor is its low electrical noise, which is most important for focusing and iris (aperture) in camera lenses.

Brushed Namiki motors use a gold alloy contact material for extremely low switching noise, which is why they are used to drive lenses in professional video cameras.

Brushless motors generally have a magnetic rotor, which slows down the response time, but we’ve solved this problem by using an inner rotor type. In order to speed up the response, the rotor diameter was made smaller to reduce the inertia moment, and by using Adamant’s winding technology, we were able to wind more thicker wires and achieve higher torque. The result is a highly responsive brushless motor that is used in high-end competition aircraft radio control servos and attracts radio control fans.

Namiki DC micro motors reach diameters as small as 1 mm. It is small enough to be built into a catheter that is inserted inside an artery. Adamant Namiki succeeded in developing the world’s smallest DC motor with a diameter of 0.6 mm in 2014, and we will continue to strive to create the world’s smallest DC micro motors.

Suitable Applications

If you take into account the above features, you will find the most suitable application for our motors.

Response performance:

-Camera lens drive

-Surveying instruments

-Industrial servomotors



-Endoscope (OCT)

-Ablation catheters

-Ultrasound endoscopy


Quietness (mechanical and electrical):

-AV equipment

-Surgical drills

-Communication Robot

-Micro robot

The Future of DC Coreless Motors

When DC brushless motors were developed, it was the era of DC analog drives. The control system has also changed to digital, and the resolution of the control system has evolved dramatically. In order to catch up with this resolution, a motor with no cogging and a fast mechanical time constant is essential. Adamant Namiki’s DC coreless motors are the solution for this digital motor era, both brush and brushless, and we will continue to develop them to meet your needs.