Non iron core linear motors and iron core linear motors are two common types of linear motors, which have significant differences in design principles, structural characteristics, advantages and disadvantages.
Firstly, ironless linear motor refers to a linear motor in which no iron core material is used, and the electromagnetic coil is directly fixed to the stationary component. Ironless linear motors can be divided into two types: single-sided drive type and double-sided drive type. A single-sided drive type ironless linear motor refers to a motor in which an electromagnetic coil is fixed on only one side, while the other side is free to move, achieved through external forces or other mechanisms. The dual side drive type ironless linear motor is equipped with electromagnetic coils fixed on both sides, and motion is achieved through the interaction between the two electromagnetic coils.
A linear motor with an iron core uses iron core material, in which an electromagnetic coil is wrapped around the iron core to generate a magnetic field through current excitation, thereby achieving motion. The common structural forms of iron core linear motors include double-layer iron cores, single-layer iron cores, and hollow iron cores.
There are significant differences in structural characteristics between ironless linear motors and iron core linear motors. The structure of ironless linear motor is relatively simple, consisting of electromagnetic coil and stator, without the fixation of iron core material, and does not require magnetic circuit design. For linear motors with iron cores, the selection and design of iron core materials, as well as the closure and routing of magnetic circuits, need to be considered. Due to the use of iron core fixation in iron core linear motors, their structure is relatively complex.
In terms of working principle, there are also differences between ironless linear motors and iron core linear motors. The ironless linear motor achieves motion through the interaction between the magnetic field generated by the electromagnetic coil and the external magnetic field. Electric current passes through an electromagnetic coil, generating a magnetic field. The magnetic field interacts with the external magnetic field to form a force, thereby achieving linear motion. A linear motor with an iron core enhances the magnetic field and improves the efficiency of the motor through the magnetic permeability of the iron core material.
In terms of performance, there are also some differences between ironless linear motors and iron core linear motors. Due to the lack of iron core material fixation, ironless linear motors are relatively light and move at a faster speed, but have a lower load-bearing capacity. However, linear motors with iron cores are relatively heavy due to the fixation of iron core materials, but have a larger load-bearing capacity and can adapt to higher workloads. In addition, the efficiency of ironless linear motors is lower than that of iron core linear motors, but the power density is higher and the volume is smaller.
From the perspective of application fields, ironless linear motors are commonly used in precision positioning and small load situations, such as optical equipment, instruments, etc; Iron core linear motors are commonly used in applications that require larger loads and lower precision requirements, such as horn motors, packaging machinery, etc.
Overall, there are significant differences and advantages and disadvantages between ironless linear motors and iron-based linear motors in terms of design principles, structural characteristics, advantages and disadvantages. Ironless linear motors are relatively simple, lightweight, and move at a fast speed, but have a small load-bearing capacity, making them suitable for precision positioning and small load applications; Iron core linear motors are relatively complex and heavy, but have a high load-bearing capacity, making them suitable for situations with large loads and low precision requirements.
