This picture of the linear motor clearly shows the internal windings, magnets and magnetic tracks of the mover (forcer, rotor). The mover is made of coils pressed with epoxy material. Moreover, the magnetic track fixes the magnets to the steel. Linear motors are often simply described as rotating motors flattened, but the working principle is the same. The forcer (rotor) is made of epoxy material that compresses the coils together; the magnetic track fixes the magnet (usually a high-energy rare earth magnet) to the steel. The mover of the motor includes coil windings, Hall element circuit board, thermistor (temperature sensor monitors temperature) and electronic interface. In a rotating electrical machine, the mover and stator require rotating bearings to support the mover to ensure an air gap between the relative moving parts. Similarly, linear motors require linear guides to maintain the position of the mover in the magnetic field generated by the magnetic rails. Just like the encoder of a rotary servo motor installed on the shaft to feedback the position, the linear motor needs a feedback device to feedback the linear position - a linear encoder, which can directly measure the position of the load to improve the position accuracy of the load.
The control of linear motors is the same as that of rotary motors. Like a brushless rotary motor, there is no mechanical connection between the mover and the stator (brushless). Unlike the rotary motor, the mover rotation and the stator position remain fixed. The linear motor system can be magnetic rail moving or thrust coil moving (most positioning The system application is that the magnetic track is fixed and the thrust coil is moving). For motors that use thrust coils to move, the weight to load ratio of the thrust coil is very small. However, highly flexible cables and their management systems are required. Motors that use magnetic rails must bear not only the load but also the mass of the magnetic rails, but do not require a cable management system.
Similar electromechanical principles are used in linear and rotary motors. The same electromagnetic force produces torque on the rotating motor and linear thrust on the linear motor. Therefore, linear motors use the same controls and programmable configuration as rotary motors. The shape of linear motors can be flat plate, U-shaped groove, and tube. Which structure is most suitable depends on the specifications of the actual application and the working environment.