Linear motor with permanent magnets. Where is the sticky point?

In summary: Where is the sticky point that prevents from doing so?It's a good question. I'm not sure what you're asking.
  • #1
sv3ora
22
0
Hello, recently I have found this diagram http://www.cropcircleconnector.com/images/part4-12.jpg
Also seen some videos on youtube.
If this really work in moving a magnet linearly, the first thing that someone may think is why not to combine this linear motor into a circle, to move a magnet continuously?
Where is the sticky point that prevents from doing so?
 
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  • #2
To get a force on a magnet, you need an inhomogeneous magnetic field. Making a long, homogeneous field is pointless. A magnet (or anything ferromagnetic) will accelerate until it reaches the homogeneous region of maximum field strength, and everything beyond that is pointless.
 
  • #3
sv3ora said:
Hello, recently I have found this diagram http://www.cropcircleconnector.com/images/part4-12.jpg
Also seen some videos on youtube.
If this really work in moving a magnet linearly, the first thing that someone may think is why not to combine this linear motor into a circle, to move a magnet continuously?
Where is the sticky point that prevents from doing so?

That device could give a one time shove on a magnet and so forth but you couldn't do continuous work with it, it needs switchable magnetic fields for that. The fields inside a 3 phase motor, for instance, is basically rotating around inside the stators which is why the motor can spin in the first place. It is MOVING magnetic fields that do work, not static fields. Just like static electricity, a voltage builds up if you rub a glass rod against a cat and you get a single spark. But the energy from that comes from the fact you moved the glass rod against the cat or fur piece or clothing, whatever, YOU are supplying the energy for that spark. The spark is gone, no more electrical work possible.

Think of a surfer on the beach. The surfer moves through the water because of the moving wave. When the wave stops, the surfer stops, it's as simple as that. There has to be a moving magnetic wave to do work otherwise those fields are just like a smooth ocean, you get no free lunch there, if you want to move, you paddle your butt around on the surfboard, the ocean will do nothing to help you move till the next wave comes by.
 

FAQ: Linear motor with permanent magnets. Where is the sticky point?

1. What is a linear motor with permanent magnets?

A linear motor with permanent magnets is a type of motor that uses a series of permanent magnets to generate a linear motion. This is in contrast to traditional motors that use electromagnets to generate rotational motion.

2. How does a linear motor with permanent magnets work?

The motor works by using the attractive and repulsive forces of the permanent magnets to create a linear motion. When an electrical current is applied, the permanent magnets interact with the motor's stator to create a magnetic field that pushes or pulls the motor's rotor, resulting in linear motion.

3. What are the advantages of using a linear motor with permanent magnets?

There are several advantages to using a linear motor with permanent magnets, including high efficiency, low maintenance, and precise control of the motor's speed and position. Additionally, these motors are compact and have a high power-to-weight ratio, making them ideal for use in applications where space is limited.

4. Where is the "sticky point" in a linear motor with permanent magnets?

The "sticky point" in a linear motor with permanent magnets refers to a phenomenon where the motor's movement becomes unstable and jerky at certain points along the track. This can occur due to misalignments or imperfections in the motor's design or components. However, this issue can be minimized through careful design and calibration of the motor.

5. What are the common applications of linear motors with permanent magnets?

Linear motors with permanent magnets are commonly used in various industrial and transportation applications, including conveyor systems, magnetic levitation trains, and robotics. They are also used in precision positioning systems, such as in the manufacturing of electronic devices.

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