What is a linear motor?
A linear motor is a transmission that converts electrical energy directly into linear motion mechanical energy without the need for any intermediate conversion mechanism. It can be seen as a rotating motor that is cut radially and flattened.
Linear motors are also called linear motors, linear motors, linear motors, and push rod motors. The most common types of linear motors are flat and U-groove, and tubular. The typical composition of the coil is three-phase, and the Hall element realizes brushless commutation.
Linear motor structure
The linear motor of this figure clearly shows the internal winding of the mover (rotor). Magnets and tracks. The mover presses the coil with an epoxy material. Moreover, the magnetic track is to fix the magnet on the steel.
Linear motors are often simply described as rotating motors that are flattened and work the same way. A forcer (rotor) is made by compressing a coil of epoxy together; the track is a magnet (usually a high-energy rare earth magnet) that is attached to the steel. The mover of the motor includes a coil winding, a Hall element circuit board, a thermistor (temperature sensor monitor temperature), and an electronic interface. In a rotating electrical machine, the mover and the stator require a rotating bearing to support the mover to ensure an airgap of the relatively moving portion. Similarly, linear motors require linear guides to maintain the position of the mover in the magnetic field generated by the track. The encoder of the rotary servo motor is mounted on the on-axis feedback position. The linear motor needs to feed back the linear position feedback device--linear encoder, which can directly measure the position of the load and improve the position accuracy of the load.
The control of the linear motor is the same as that of the rotary motor. Like a brushless rotary motor, there is no mechanical connection between the mover and the stator (brushless). Unlike the rotary motor, the rotor rotation and the stator position remain fixed. The linear motor system can be a magnetic or thrust coil (most of the positioning). The system application is that the track is fixed and the thrust coil is moved). For a motor that uses a thrust coil, the weight and load ratio of the thrust coil are small. However, high flexibility cables and their management systems are required. A motor that uses a magnetic track not only has to withstand the load but also withstands the quality of the track, but does not require a cable management system.
Similar electromechanical principles are used on linear and rotary motors. The same electromagnetic force produces a torque on the rotating electrical machine that produces a linear thrust action on the linear motor. Therefore, linear motors use the same control and programmable configuration as rotary motors. The shape of the linear motor can be flat and U-shaped, and tubular. Which configuration is best suited to the specifications and working environment of the actual application.
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