The structure of the linear motor is selected in various types of linear motors in terms of efficiency and size. Dynamic coil motors are easy to design and can control stroke, but they require large permanent magnets for high efficiency; and larger size moving coil motors are difficult to apply to domestic refrigerator compressors due to their lower energy intensity. The types of moving coil motors selected in this paper are more suitable for use in smaller refrigerator compressors. Because there are no more expensive magnets, moving magnet motors are cheaper but less efficient. The development of the latest high-energy permanent magnets contributes to the efficiency and compactness of moving magnetic linear motors. Due to the high magnetic flux, the moving magnetic motor can generate enough power under a small number of magnets, so the moving parts are much lighter than other types of motors. Smaller moving parts quality means that it is easy to design a resonant spring that meets a linear compressor. Therefore, the application of moving magnet motors is the main direction of high-energy linear motors. It is a structural diagram of a linear motor of the type we selected from the schematic diagrams of many moving magnetic motors. The moving magnet whose stator is embedded in the fixed frame is divided into inner and outer parts. The stator is composed of a plurality of thin metal sheets which are located in the radial direction to reduce eddy current loss, and an annular coil is mounted inside the outer stator. Efficiency and size The size of the motor is directly proportional to the force required. High speed and low driving force are recommended when designing a small motor. In a conventional compressor using a high-speed rotary motor, the piston torque is amplified to a degree equivalent to the degree of crankshaft deceleration. However, the linear motor can directly drive the piston motion at a low speed and a short stroke at a frequency of or. Therefore, the piston requires a large driving force, but this causes the motor to be large in size. Inside the compressor, typically the rotational speed of the rotating motor is approximately double the speed of the linear motor. Single-phase induction asynchronous motors or permanent magnet ferrite DC motors are commonly used in ordinary compressors. The magnetic flux of the magnet is twice that of the ferrite, and the physical characteristics of the moving magnetic linear motor are almost the same as those of the ordinary motor.
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