How to make a simple linear motor?

The first step is to make the coil with enameled wire.

Wrap the highlighter about 15 times. Be careful not to wrap around the ends of the thread, leaving both ends of the thread. Then wrap the ends of the wire around the coil to fix the shape.

Note that this is a complete wire, and then use a utility knife to remove part of the insulation at both ends of the wire, as shown in the image below. Note that the insulation at one end can be removed by a full turn, but only half of the insulation at the other end can be removed. In other words, when the coil is spinning, it is not energized half the time.

Step 2: Make the Bracket In this step, the coil is placed on two needles with larger pinholes. If there is no such needle, it can also be replaced with a wire or paper clip as a wire holder. The third step, assembly, lay the battery flat on the table, with plasticine.

Fixed. Secure the wire bracket and magnet. Observing the effect, as long as the battery is connected, the coil can be moved.

If it doesn't move, try spinning the coil. Experimental Principle In this experiment, a coil, wire, and battery form a closed circuit. A magnetic field is generated around the coil through which the current is passed, which repels the magnet underneath, so it spins!

Why only a portion of the insulation is removed? This is because if the insulation layer is removed by a full turn, the coil will rotate to a certain position and attract the magnet, and the coil will not rotate. <>

Linear motor refers to the motor that produces mechanical energy of linear movement, which is mainly used for electronic locks and some other CNC equipment.

The traditional linear motor is mostly generated by the rotor (i.e., motor), and is driven to drive the gear to move by the gearbox deceleration, and moves in a straight line with the groove, and its structure is shown in Figure 1, comprising: reduction box 11, reduction gear 12, secondary gear 13, motor 14, transmission shaft 15, transmission gear 16 and U-groove component 17, wherein: secondary gear 13 is arranged on reduction gear 12 side and meshed with the tooth-like structure of U-shaped groove component 17, and reduction gear 12 is placed in reduction box 11, and the gear tooth is meshed with the transmission gear 16 that is sleeved to the transmission shaft 15 in the center, and the motor 14 is driven to rotate through the transmission shaft 15 after starting, so that the reduction gear 12 and the secondary gear 13 are driven to rotate, and then the U-shaped groove component 17 is moved in a linear motion relatively.

It can be seen that the above-mentioned linear motor converts the rotational force generated by the rotor into a linear force through the intermediate structure of the gear, and is not a linear motor in the true sense. In the working process, the occlusion and friction of the gear will directly affect the performance of the motor, resulting in the large instability of the linear motor; And the structure is also more complex, which increases the instability of the linear motor; In addition, the presence of intermediate structures will increase the power consumption of the motor. <>

Please first figure out what a linear motor is.

The working principle of the linear motor: when the primary winding is connected to the AC power supply, it will generate a traveling wave magnetic field in the air gap, and the secondary will induce an electromotive force and generate an electric current under the cutting of the traveling wave magnetic field, and the current will react with the magnetic field in the air gap to produce electromagnetic thrust.

If the primary is fixed, the secondary moves in a straight line under the action of thrust; On the contrary, the primary line motion is done. Drive control technology of linear motorA linear motor application system must not only have a linear motor with good performance, but also have a control system that can achieve technical and economic requirements under safe and reliable conditions.

With the development of automatic control technology and microcomputer technology, there are more and more control methods for linear motors.

Applications of Linear Motors:

The linear motor can be regarded as a deformation of the rotating machine in terms of structure, which can be regarded as a rotating machine that is cut along its radial direction and then flattened and evolved.

With the rapid development of automatic control technology and microcomputer, the positioning accuracy of various automatic control systems has put forward higher requirements, in this case, the linear motion drive device composed of traditional rotating machine plus a set of transformation mechanism has been far from meeting the requirements of modern control system.

Linear motors are mainly used in three aspects: first, they are used in automatic control systems, which are more widely used; secondly, it is a drive motor for long-term continuous operation; Third, it is used in devices that need to provide huge linear motion energy in a short time and short distance.

High-speed maglev train Maglev train is the most typical example of the practical application of linear motors, the United States, Britain, Japan, France, Germany, Canada and other countries are developing linear levitation trains, of which Japan has made the fastest progress.

Generally, the motor is rotating when it works, but the vehicles driven by rotating motors (such as electric locomotives and trams in the city, etc.) need to do linear motion, and some parts of the machine driven by rotating motors also need to do linear motion. This question was raised decades ago, and now there are motors that move in a linear motion, or linear motors

The principle of linear motor is not complicated Imagine that a rotary induction motor is cut along the direction of the radius and flattened, which becomes a linear induction motor (Fig.) In linear motor, which is equivalent to the stator of a rotating motor, it is called primary; It is equivalent to the rotor of a rotating motor, which is called the secondary The primary is connected to AC, and the secondary is moving in a straight line along the primary under the action of electromagnetic force At this time, the primary should be very long, extending to the position that the motion needs to reach, and the secondary does not need to be so long In fact, the linear motor can make both the primary and the secondary very long; It can be both primary fixed and secondary mobile, and secondary fixed and primary mobile

Linear motor is a new type of motor, which has been widely used in recent years Maglev trains are driven by linear motors

Maglev train is a brand new train General train, due to the friction between the wheels and the rails, which limits the increase in speed, the maximum running speed it can achieve does not exceed 300km n The maglev train is to levitate the train with magnetic force to disengage the train from the guide rail to reduce friction and increase the speed. The train is pulled by a linear motor A stage of the linear motor is fixed on the ground and extends to the distance together with the guide rail; The other stage is installed on the train The primary is connected to the AC, and the train moves along the guide rail The train is equipped with a magnet (some are the coils that also use linear motors), and when the magnet moves with the train, the coil (or metal plate) located on the ground generates an induced current, and the electromagnetic force between the magnetic field of the induced current and the magnet (or coil) on the train levitates the train The advantages of the suspended train are that it runs smoothly, there is no bumps, the noise is small, and the traction force required is small. As long as a few thousand kW of power can make the speed of the suspension train reach 550km h When the suspension train slows down, the change of the magnetic field decreases, the induced current also decreases, and the magnetic field weakens, resulting in a decrease in the suspension force The suspension train is also equipped with a wheel device, its wheels are like an airplane, which can be collected into the train in time when it is moving, and can be put down when it stops to support the train

In order to levitate a huge train by magnetic force, a strong magnetic field is required, and in practice, such a strong magnetic field needs to be generated by a high-temperature superconducting coil

In addition to being used in maglev trains, linear motors are also widely used in other aspects, such as for transmission systems, electric hammers, electromagnetic stirrers, etc. In China, linear motors have also been gradually promoted and applied Although the principle of linear motors is not complicated, it has its own characteristics in terms of design and manufacturing, and the products are not as mature as rotary motors, which need to be further studied and improved

The working principle and practical application of linear asynchronous motor.

Categories: Education, Science, >> Science & Technology.

Analysis: An electric motor that uses electrical energy to directly produce linear motion. Its working principle is similar to that of the corresponding rotary motor, and the structure can be regarded as the evolution of the corresponding rotating motor along the radial cutting and straightening.

Linear motors include two main parts: stator and mover. Under the action of electromagnetic force, the mover drives the external load to call up the operating work. In the case of linear motion, the use of linear motor can simplify the overall structure of the device, which is mostly used in various positioning systems and automatic control systems.

The high-power linear motor can be used for the traction of high-speed trains of electric railways and the launching of torpedoes.

Linear motors are divided into DC linear motors, AC linear asynchronous motors, linear step mold cluster motors and AC linear synchronous motors according to the limb Kai principle, among which the first three applications are more.

A linear motor is a transmission device 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 machine that is radially cut and unfolded into a flat surface.

With the characteristics of high speed, high acceleration, high precision and unlimited strokes, linear motors play a very important role in logistics systems, industrial processing and assembly, information and automation systems, transportation and civilian, and military fields.

The main applications of linear motors: first, they are used in automatic control systems, and there are many such applications; secondly, it is used as a long-term continuous operation of the drive branch car motor; Third, it should be used in devices that need to provide huge linear motion energy in a short time and short distance.

Generally, the motor is rotating when it works, but the vehicles driven by rotating motors (such as electric locomotives and trams in the city, etc.) need to do linear motion, and some parts of the machine driven by rotating motors also need to do linear motion. This question was raised decades ago, and now there are motors that move in a linear motion, or linear motors

The principle of linear motor is not complicated Imagine that a rotating induction motor is cut along the direction of the radius and flattened, which becomes a linear induction motor (figure) In the linear motor, which is equivalent to the stator of the rotating motor, it is called primary; It is equivalent to the rotor of a rotating motor, which is called the secondary The primary is connected to AC, and the secondary is moving in a straight line along the primary under the action of electromagnetic force At this time, the primary should be very long, extending to the position that the motion needs to reach, and the secondary does not need to be so long In fact, the linear motor can make both the primary and the secondary very long; It can be both primary fixed and secondary mobile, and secondary fixed and primary mobile

Linear motor is a new type of motor, which has been widely used in recent years Maglev trains are driven by linear motors

Maglev train is a brand new train General train, due to the friction between the wheels and the rails, which limits the increase in speed, the maximum running speed it can achieve does not exceed 300km n The maglev train is to levitate the train with magnetic force to disengage the train from the guide rail to reduce friction and increase the speed. The train is pulled by a linear motor A stage of the linear motor is fixed on the ground and extends to the distance together with the guide rail; The other stage is installed on the train The primary is connected to the AC, and the train moves along the guide rail The train is equipped with a magnet (some are the coils that also use linear motors), and when the magnet moves with the train, the coil (or metal plate) located on the ground generates an induced current, and the electromagnetic force between the magnetic field of the induced current and the magnet (or coil) on the train levitates the train The advantages of the suspended train are that it runs smoothly, there is no bumps, the noise is small, and the traction force required is small. As long as the power of a few thousand kW can make the speed of the suspended train reach 550km h When the suspension train decelerates, the change of the magnetic field decreases, the induced current also decreases, and the magnetic field weakens, resulting in a decrease in the suspension force The suspension train is also equipped with a wheel device, and its wheels are like airplanes, which can be collected into the train in time when it is moving, and can be put down when it stops to support the train

In order to levitate a huge mass train by magnetic force, a strong magnetic field is required, and in practice, it is necessary to use a high-temperature superconducting coil on land to generate such a strong magnetic field

In addition to being used in maglev trains, linear motors are also widely used in other aspects, such as for transmission systems, electric hammers, electromagnetic stirrers, etc. In China, linear motors have also been gradually promoted and applied Although the principle of linear motors is not complicated, it has its own characteristics in terms of design and manufacturing, and the products are not as mature as rotary motors, which need to be further studied and improved

Linear motor can be regarded as an evolution of the structure of a rotating motor, which can be regarded as a rotating motor that is cut along the radial direction, and then the circumference of the motor is stretched into a straight line, as shown in Figure 1-2. In this way, the most primitive linear motor evolved from a rotating motor was obtained. The side that evolves from the stator is called the primary, and the side that evolves from the rotor becomes the secondary.

Since there is a relative motion between the primary and the secondary at the time of operation, if the primary and secondary coincide with each other at the beginning of the motion, then in the motion, there are fewer and fewer parts of the coupling between the primary and the secondary, and they cannot move normally. In order to ensure that the coupling between the primary and secondary stages remains constant within the required travel range, the primary and secondary stages are manufactured to different lengths in world applications. Because the manufacturing cost and operation cost of the segment primary are much lower than that of the short secondary, the short primary and long secondary are generally used.