What are coreless motors?
  • FBelec manufacturer supplies high power coreless motors , coreless dc motors, small coreless motor, coreless brushless motor and motor coreless also known as hollow cup rotor. Contact our sales team today for FREE quote!

    Are you sure you know about coreless motors and their advantages? If the answer is "not much" or "just a little", then this article is for you.

    Let's start with a definition: a coreless motor is a brushless or brushed motor with a coil wound on itself and not on iron. For this reason, it is also called ironless.

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  • motor brushless coreless ironcore
  • Coreless motor windings are typically "oblique" or "honeycomb" in design to create a dense, self-supporting weave that is then held in place with epoxy resin. The stator in brush motors is made of rare earth magnets and is located in the most internal part of the motor, whereas the magnet in brushless motors is always internal and is located in the rotor.

    The use of rare earth magnets and coreless motor construction technology ensure maximum power in the smallest possible package.

    So, why go with a coreless motor?

    This novel design has several advantages, not the least of which is the elimination of the cogging effect. Cogging is a characteristic of conventional permanent magnet motors that machine builders dislike. This is the "snap" that occurs when the tooth is aligned with the opposing magnet and passes through the intermediate unstable magnet. Please see this article for more information on cogging. As you might expect, the absence of this effect will allow for a more fluid and uniform motion.

  • motor brushless coreless min
  • Another benefit of coreless DC motors is their low level of electromagnetic interference (EMI); in fact, the presence of the external ferromagnetic structure confines interference. This is especially useful when other EM signals, such as those produced by smartphones or medical devices, are present in the application. Coreless motors can also be used in battery-powered devices because of their low current consumption.

    Other benefits include a long operating lifetime, a high overload capacity (no iron saturation), excellent heat dissipation, a low inertia, high torque and speed, compactness, and lightweight.A significant advantage is high efficiency. The absence of a ferromagnetic core in coreless motors means that iron losses are eliminated, resulting in significantly higher efficiency when compared to traditional iron core direct current motors. The rotor mass and inertia are reduced in coreless motors, resulting in rapid acceleration and deceleration. The key performance characteristics in high-dynamic applications.

    You'll also be pleased to know that coreless DC motors are available in both brushed and brushless configurations. The distinction is whether or not the brushes are present. Brushes and commutators provide current commutation in the stator windings and changes in magnetic field orientation in the former, whereas special "hall sensors" provide the rotor position in the latter.

  • brushed coreless
  • Needless to say, each type of coreless motor (with or without brushes) has advantages and disadvantages, as well as reference applications. There are also significant differences in brush materials for brushed coreless motors, which are typically graphite or precious metals. A specialist supplier of brushless motors and brushed coreless motors, such as Servotecnica, will be able to advise on the best solution for a specific application.

    Coreless DC motors are ideal for a variety of dynamic applications, such as small positioning systems and pan/tilt systems in robotics. Coreless motors are also useful in medical devices such as prosthetics, insulin pumps, X-ray machines, and laboratory equipment. Furthermore, there are numerous applications in high-demand industries such as aerospace, defense, and surveillance.

    There are numerous other examples, including automotive systems, wire tensioning systems, microscopes and electric screwdrivers, tattoo machines, golf caddies, and massage chairs (to name a few). The possibilities for designers with a coreless motor are limitless.

    Visit our dedicated coreless motor products for a more detailed comparison of coreless and iron core motors.

    Contact our team of experts to learn more about how and at what level coreless motors can improve the performance of your application.


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