Abstract: Based on the safety requirements of switch machines at the frog points of narrow-gauge railway tracks above and below ground in coal mines, a cylindrical linear motor-driven switch machine was designed, and its working principle and design calculations are introduced. Keywords : Linear motor; Switch machine; Design calculation 1. Overview Switches are a key link connecting narrow-gauge railway lines above and below ground in coal mines, and the switch machines used to drive the frog points are one of the important pieces of equipment to ensure the safe operation of locomotives and mine cars and improve transportation efficiency. Currently, manual switch machines are commonly used, with a few pneumatic switch machines also being used. These switch machines all have various shortcomings. For example, manual switch machines, although simple in structure, have low efficiency and cannot achieve automatic control, while pneumatic switch machines require an independent air source and consume a lot of energy. Therefore, we combined the new linear motor technology widely used in coal mines to design a new type of cylindrical linear motor-driven switch machine. This machine is simple in structure, reliable in performance, has few faults, is easy to maintain, has strong overload capacity, and is particularly suitable for intermittent linear motion working conditions. It can achieve automatic operation of the switch machine while reducing energy consumption, and is particularly suitable for the requirements of coal mine sites. 2. Basic Working Principle As shown in Figure 1, imagine cutting a rotary motor radially at a certain point, and straightening the stator and rotor along the circumference. This forms a planar linear motor. The unfolded stator is the primary of the linear motor, and the unfolded rotor is the secondary. Further special conversion of the planar linear motor forms a cylindrical linear motor. When three-phase alternating current is applied to a cylindrical linear motor, a axially moving translational magnetic field is formed inside the motor, driving the cylindrical secondary winding to perform linear motion. Electrical energy is directly converted into linear mechanical energy. Changing the phase sequence of the power supply to the cylindrical linear motor changes the direction of motion of the secondary winding. This is the basic working principle of a cylindrical linear motor. [b][align=center]For more details, please click: Design of a Novel Linear Motor-Driven Switch Machine[/align][/b]