The working principle of linear motor
2024-04-25
Linear motors are often simply described as flat rotary motors and operate in a simultaneous manner. The tablet press (rotor) uses epoxy resin material to compress the coil, and the magnetic track is a magnet attached to steel (usually high-energy rare earth broken iron." The actuator of the motor includes coil winding, Hall element circuit board, thermal electric male (temperature sensor monitoring temperature "and electronic interface. In a rotating electric machine, the rotor and the stator need to be supported by rotating bearings to ensure the air gap of the relative moving parts. At the same time, the linear motor also needs a linear guide to maintain the position of the actuator in the magnetic field generated by the magnetic track
Like the encoder installed on the shaft of the rotary servo motor, the linear motor needs a linear position feedback device, that is, a linear encoder, which can directly measure the position of the load and improve the position accuracy of the load.
The side evolved from the stator is called the main stator, and the side evolved from the rotor is called the secondary stator. In practice, the primary and secondary are manufactured in different lengths to ensure that the coupling between the primary and secondary remains at a constant desired range of travel. The linear motor can be a short main motor or a long auxiliary motor. Considering the manufacturing cost and operating cost, the short one and the long two are generally adopted at present.
The working principle of a linear motor is similar to that of a rotating motor. Taking a linear induction motor as an example, when the primary winding is connected to an AC power source, a traveling wave magnetic field is generated in the air gap. When the secondary traveling wave magnetic field is cut off, it will induce electromotive force and generate current. When the current interacts with the magnetic field in the air gap, electromagnetic thrust is generated. If the primary lever is fixed, the secondary lever moves in a straight line under thrust. On the contrary, the beginner's movement is in a straight line.
Linear motor, the principle is not complicated. Imagine a rotating induction motor splitting and flattening along a radius. This becomes a linear induction motor. In the linear motor, equivalent to the stator of the rotating electric machine, called the main stator, equivalent to a rotating electric machine rotor, called the secondary rotor. The main electrode moves along a straight line under the action of electromagnetic force. The primary stage needs to be long enough to reach the position required by the movement, while the secondary stage does not need to be long enough. In fact, the linear motor can be made very long in both the primary and intermediate levels. It can be mainly fixed and secondarily moving, or secondarily fixed and mainly moving.
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