Analysis of electromagnets and permanent magnets

When the core is inserted inside the energized solenoid, the core is magnetized by the magnetic field of the energized solenoid. The magnetized core also becomes a magnet, so that the magnetic properties of the solenoid are greatly enhanced by the superimposition of two magnetic fields. In order to make the electromagnet more magnetic, the iron core is usually made into a hoof shape. But pay attention to the winding of the coils on the hoof-shaped iron core, which is clockwise and the other side must be counterclockwise. If the winding direction is the same, the magnetization of the iron cores of the two coils will cancel each other and the core will not be magnetic. In addition, the core of the electromagnet is made of soft iron and cannot be made of steel. Otherwise, once the steel is magnetized, it will maintain its magnetic properties for a long period of time without demagnetization. Therefore, the magnetic strength of the steel cannot be controlled by the size of the current and lose the advantages that the electromagnet should have.
An electromagnet is a device that can generate magnetic force by passing current. It is a non-permanent magnet that can be easily magnetized or eliminated. For example: Large cranes use electromagnets to lift abandoned vehicles.
When a current passes through the wire, a magnetic field is generated around the wire. With this property, when a current is passed through the solenoid, a uniform magnetic field is created within the solenoid. Assuming that a ferromagnetic substance is placed in the center of the solenoid, the ferromagnetic material will be magnetized and the magnetic field will be greatly enhanced.
In general, the magnetic field generated by an electromagnet depends on the size of the current, the number of turns of the coil, and the central ferromagnetic body. When designing an electromagnet, attention is paid to the distribution of the coils and the selection of the ferromagnetic body, and the magnitude of the current is used to control the magnetic field. Since the material of the coil has resistance, this limits the size of the magnetic field that can be generated by the electromagnet , but with the discovery and application of superconductors, there will be opportunities to surpass the existing limitations.
Compared with permanent magnets
Both permanent magnets and electromagnets can be made to produce different forms of magnetic fields. When choosing a magnetic circuit, the first thing to consider is what you need to do with the magnet. In situations where electricity is inconvenient, power cuts are frequent, or there is no need to adjust magnetic forces, permanent magnets dominate. Electromagnets are useful for applications that require a change in magnetic force or require remote control. Magnets can only be used in the original predetermined way. If the wrong type of magnet is used for a particular purpose, it can be extremely dangerous or even fatal.
Many machining operations are performed on heavy block materials that require permanent magnets. Users of many machinery factories believe that the biggest advantage of these magnets is that they do not require electrical connections.
Permanent magnets feature 330 to 10,000 lbs of lift capacity and can be turned on or off by simply turning a handle. Magnets are generally equipped with a safety lock to ensure that the magnet does not accidentally break when lifted. Magnet sets can be used for long loads that are too heavy for a single magnet to handle.
Also, parts that are ready to be machined at many times are very fine (0.25 inch or finer) and are extracted from a pile of similar parts. Permanent magnets are not suitable for only one job at a time from a pile of parts. Although permanent magnets are extremely reliable when used correctly, they cannot change the magnetic force. In this respect, the electromagnet enables the operator to control the strength of the magnetic field through the variable voltage control device and can select one of the stacked components. Self-contained electromagnets are the most cost-effective magnets in terms of lift per unit and their ability to lift up to 10,500 lbs.
Battery-powered magnets are useful, they use self-contained colloidal batteries to increase lift capacity, and can handle flat, round, and component-shaped products. The battery-powered magnet can repeatedly perform the lifting action, providing a considerable lifting capacity without an external power supply.

High Speed Door Motor And Control Box

Our company have German SEW Motor, Japan Mitsubishi Controller. Our own brand Hofic servo motor and controller. Chinese famous brand SEJ motor and Holip controller.

About our German SEW Motor and Japan Mitsubishi Controller: It is easy to find the ideal energy-efficient motor for your application at SEW. The series has a suitable design in its range for the globally applicable efficiency classes. Select the power and frequency within this motor design and you have already taken care of the most important selection criteria.All other motor options are of course available independently of the efficiency class. A comprehensive braking concept and cost-optimised built-in encoders ultimately complement the motor range. Comprehensive braking concept and combinations i.e. up to three different brake sizes per motor size featured in the range: Cost-optimised built-in encoders integrated into the motor. Motors for efficiency classes IE1 to IE4.Compact design saves space and costs. Future-proof, also as regards environmental protection (standards). Reduction in operating costs when using energy-efficient motors; our energy-efficient motors conform to the efficiency classes.

About servo High Speed Door Servo Control System: Our rolling gate servo control system is suitable for high speed and high usage soft and hard rolling gate. The whole system is in a small and light package, it has high torque and high operating speed, lower noise, high reliability, smooth and soft operating curves, it`s suitable for high speed and usage environment. The rolling curtain can be controlled by pull switch, push button, Bluetooth, ground radar, ground magnetic sensors. Operating Speed: 1M/s; Operating Width: ＜16 ㎡; Daily operating time: ＞2000 time; Rated voltage: 220v; Rated Output: 0.75 KW/1.5KW.

The system can operated via: 1) control box; 2) inching electronic control; 3) continuous automatic operation; 4) emergency stop; 5) single side operation box; 6) time delay; 7) ground radar and/or magnetic sensors. Please refer to Wiring Terminal for eternal connections.

System has fuse/safety wire shutdown switch for three-phase power protection, fuse/safety wire for operating circuit protection, and temperature sensing relay for motor protection.

Stroke Controller utilizes absolute value encoder. Connect the absolute value encoder and reducer via encoder`s axle, and fix the wings on to the reducer, than insert the aviation plug into plug receptacle.

The mounting screw for the control box must inspect regularly to prevent screw been getting loose and falling off. Check the internal and external wirings. Check and change the oil for the redactor on regular basis.

Precision: The system use Full closed-loop servo control and Double Encoder design. This is to ensure long operating life and to prevent overshooting during operating.

Stability: The system utilizes integrated design concept, in order to simplify internal wiring and prevent any function caused by wiring and terminal connections.

High Speed: Motor max speed is 2500 rpm; door max operating speed is 2 m/s.

Smooth: The torque servo system can adjust torque to the load automatically, and its speed curve mode step less speed regulating to ensure a smooth operation.

About SEJ motor and Holip controller: Three-phase asynchronous motor with magnetic brake has broad uses, It is suitable for various mechanical main drive and auxiliary drive, and it is also used for various required rapid stopping and correct positioning. The braking time within 0.2 second. Electric motor is added the DZM series direct current electromagnetic arrester by the basic series(Y series) electric motor.The protection class of electric motor part is IP44,the arrester part is IP23.if be applicable to bad environment can also make the arrester part into IP44,but customer have to put forward a special request while ordering,the manufactory can design a manufacturing exclusively. Its structure diagram is picture 1 and 2,picture 1 is the structure with hand release.Picture 2 is the structure without the hand release.Its operating principle BE, after being to make the retardation coil(6)to connect direct current power supply,because of the function of electromagnetic force,electromagnet(7)attract gag bit(5),and compress spring(24),make arrester disc(2)away from the friction surface of the gag bit(5)and shield(26)(the electrical motor can immediately operate normally).When the power supply cuts off after,the electromagnet(7)loses electromagnet force,the spring(24)releases the gag bit(5)and compress tightly to arrester disc(2),the arrester function,stop(the motor shaft)quickly,make electric motor shop turning to move,for the second time connect power supply will repeat above-mentioned action.

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Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.selfrepairinghighspeeddoor.com