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When it comes to linear motors, the English name is linear servomotor. In fact, the motors we commonly see now are all rotary motors. From the history of the development of motors, we can talk about the various functional applications and advantages of motors.
1. The principle of linear motor:
In the industry, linear motors are also called "direct drives", so if you see direct drive, it is describing both linear motors and DD motors. Remember, direct drives in the industry include DD motors.
The principle of a linear motor is not complicated. You can think of it as cutting a rotary induction motor in the radial direction and flattening it, and this is a linear motor.
If we understand it in comparison with a rotating motor, in a linear motor, the part equivalent to the stator of a rotating motor is called the primary; the part equivalent to the rotor of a rotating motor is called the secondary. Alternating current passes through the primary, and the secondary moves in a straight line along the primary under the action of electromagnetic force.
From the perspective of electromagnetic induction: the two types of flat linear motors in the figure above, (a) is a flat linear motor, and ( b ) is a double flat linear motor.We use the situation in (b) to illustrate the change of electromagnetic force. The primary is the upper and lower sides, and the permanent magnet provides a complete electromagnetic circuit. The wire in the secondary coil can just cut the electromagnetic inductance line to generate Ampere force. According to the left-hand rule, we can see that the secondary will move to the left or right. 2. Types of linear motors:2. DD motor (direct drive motor)This direct-drive DD motor can provide greater torque. The voice coil motor is similar to the linear motor in principle and can be simply understood as a linear motor with fewer coil turns. 4. Major players in linear motors Currently, there are not many major linear motor players in the Chinese market, and they are mainly concentrated in South China. In the field of domestic direct drive servo, Gaochuang is the best in drive, and in the linear motor market, Yakobisi has the largest market size. At present, the main players in the direct drive market are enterprises that have been using their own equipment for a long time, such as Han's Laser, etc. 5. Main application scenarios of linear motors The main application areas include: laser equipment, 3C non-standard equipment such as testing, lamination, etc. It also includes the medical field with high requirements for cleanliness. 6. Linear Motor Market Size According to research conducted by authoritative organizations in the industry, the total size of the direct drive market is approximately 2 billion. It is still in its infancy.
XINDA