Definition and working principle of electromagnet: The magnetic field generated by the energization of the coil attracts or repels the magnetic conductive parts and performs mechanical work externally, which is called electromagnet. Linear and rotary compound motion is widely used in industrial automation today, and electromagnets have been widely used in various automatic devices.
2. Typical structure of electromagnet
When the linear electromagnet is energized, it drives the load towards the iron core. In this sense, the electromagnet is a kind of pulling device. However, if a top rod is installed in the section of the sliding rod and passed through the depth of the hole in the iron core, when it is When sucked in, the ejector rod will extend away from the iron core to push the external load a specified distance, so the electromagnet can provide force and tension.
3. Determination of the direction of the electromagnet magnetic field
Determination of magnetic field direction: According to Ampere's right-hand rule, the direction of the magnetic field generated by the current cycle can be determined by the right-hand rule. The method takes the direction of the four fingers outside the thumb toward the bend of the palm as the direction of the current, then the direction pointed by the thumb is the north pole of the magnetic field.
Fourth, electromagnet terminology
1. Power: the push or pull force, suction force generated by the coil of the electromagnet after it is energized;
2. Stroke: the distance from the starting point of the slider movement to the final stop position;
3. Holding force: the pulling force or pushing force of the slider at the end of the stroke;
4. Working cycle: the ratio of the power-on time to the sum of the power-on and power-off time;
5. Continuous power on: 100% duty cycle;
6. Gap duty cycle: less than 100% duty cycle, it has a longest allowable power-on time so that the temperature is not too high;
7. Residual magnetism: the residual magnetic force after the electromagnet is powered off;
8. The maximum working temperature of the coil: the maximum working temperature of the coil cannot adversely affect the organization and function of the material. This temperature is the sum of the ambient temperature and the temperature rise of the coil, which is usually 130 degrees Celsius;
9. Ampere turns: the product of current and coil turns;
10. Response time: the time for the slider to pull in place after power-on.
