The coreless motor is a new type of special motor, and the forceless part of the iron core motor is placed between the two tracks. They are also known as U-channel motors. There is no iron in the coil of the force parts, which is called the ironless motor. Its copper windings are encapsulated in the air gap in the center of the two rows of magnets. Because there is no iron in the motor, so there is no force between the force components and the track to produce attractive or cogging force.
　　The mass of the force-applying part in the iron-free motor is often smaller than that of the core part of the iron core motor, so that the motor of this arrangement can produce a great acceleration rate, so that the dynamic performance of the motor group is very good The No iron core layout without the effect of cogging and attraction, it can increase the bearing life, in some environments and even can use smaller bearings.
　　Because the coreless motor layout has a wonderful dynamic performance, in the course of activities will not appear cogging effect, so the effect is very strong, but their cooling is not as good as the core motor, because of their small area of war, from the winding base to the cooling The thermal conduction path of the board is long, so that the full load power of these motors is low. In addition, in order to meet the force and stroke to meet the acceptance of the double-row magnet layout also increased the total cost of the motor.
　　The advantages of the coreless motor: First, compared with the traditional radial magnetic field structure design, the use of axial magnetic field structure design, a substantial increase in power density and torque volume ratio. Second, the use of new winding process, high-pressure precision die-casting molding and polymer materials, effectively reduce the winding copper loss. 　　　　　Third, do not use silicon steel sheet as a fixed, rotor core material, eliminating the magnetic damping and iron loss, reducing the drive power, reducing the iron loss heat source.
　　No iron core of the shortcomings: a large air gap, resulting in the required magnetic field magnetic potential, high cost of the magnet; two winding manufacturing process is complex; three coils, carbon brush easy to damage, easy to repair.
　　Kunshan Tongmao Electronics Co., Ltd., the production of U-shaped iron-free linear motor structure is simple, fast response, high sensitivity, good followers, good sealing, not afraid of pollution, adaptability, stable and reliable, long life. So it is widely used in all walks of life.
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