{"id":5257,"date":"2020-10-16T09:58:58","date_gmt":"2020-10-16T09:58:58","guid":{"rendered":"https:\/\/comestero.com\/?p=5257"},"modified":"2020-11-30T15:34:24","modified_gmt":"2020-11-30T15:34:24","slug":"linear-and-rotary-solenoids-functional-scope","status":"publish","type":"post","link":"https:\/\/comestero.com\/en\/news-en\/linear-and-rotary-solenoids-functional-scope\/","title":{"rendered":"LINEAR AND ROTARY SOLENOIDS – FUNCTIONAL SCOPE"},"content":{"rendered":"

The basic principle of solenoids is the conversion of electrical energy into force and movement.<\/h2>\n

When the actuation process for automating a machine involves linear or rotary motion<\/span>, be it simple on-off operation or more complex sequencing, solenoid are the best choice in terms of size, cost, simplified installation and ease of use.<\/p>\n

There are other device to converting electrical energy into linear motion, such as electric motor or a pneumatic cylinder. Compared to solenoids, these devices are not very competitive economically and are more suitable for long runs or where the use of the electromagnet is not possible.<\/p>\n

How solenoid works and construction<\/h3>\n

When an electric current passes through a coil, a magnetic field is created around the winding. As the number of windings (turns) of the wire of which the coil is made increases, the magnetic field will be stronger.<\/p>\n

\"elettromagnetiBy adding an iron or steel containing structure around the coil, the magnetic field will flow much more easily and will concentrate where we want it. If we also add a movable iron core called “plunger” to the center of the coil, the magnetism will become even more concentrated. In this way we have made the basic electromagnet.<\/p>\n

A solenoid is essentially constituted by a coil, an iron shell or case and and a movable plunger or pole and is designed to operate in continuous or alternating current.<\/p>\n

A major objective in the design of a solenoid is to provide an iron path capable of transmitting maximum magnetic flux density with a minimum energy input.<\/strong><\/p><\/blockquote>\n

The\u00a0magnetic flux density<\/span>\u00a0in the work area can be increased by increasing the electrical input to the coil. However, as the electrical energy increases, the coil temperature increases and the work force is reduced. The maximum value with which the input current can be increased depends on the duty cycle and the maximum permissible coil temperature.<\/p>\n

The maximum temperature<\/strong> is defined by the insulation class of the material used in the construction.<\/p>\n

DUTY CYCLE<\/h4>\n

The Duty Cycle<\/strong> can be defined as the time in which the electromagnet can be energized without overheating. The formula for calculating the duty cycle is:<\/p>\n

RELATIVE DUTY CYCLE % = (ON TIME \/ (ON + OFF TIME) x 100<\/p>\n

\"elettromagnetiContinuous operation<\/strong><\/span>\u00a0should not be confused with continuous duty cycle<\/strong><\/p>\n

The continuous duty cycle (100% rating) means that the solenoid can be left energised for an indefinite period of time at its rated voltage without overheating.<\/p>\n

In continuous operation, on the other hand, it is possible to alternate between actuation states (ON) and deactivation (OFF), as long as the relative% of the permitted work cycle is not exceeded. Some duty cycles have been developed to allow solenoids to produce greater forces where they are not continuously energized.<\/p>\n

Linear or rotary solenoid?<\/h3>\n

Although solenoids basically function in much the same way, the resulting direction of movement can be different. It is determined by the type of mechanical assembly in which the electromagnetic circuit is housed.<\/p>\n

\"open<\/a>Linear solenoids<\/span><\/strong>\u00a0provide a mechanical pulling or pushing force or motion dependent on the mechanical configuration of the unit, which can be unidirectional or bidirectional. Since the operation of linear solenoids is simpler than rotary, making them more cost effective.<\/p>\n

Usually classified as pull, where the electromagnetic path pulls a plunger into the solenoid body. Or push type where the plunger \/ shaft is extended through the base of the solenoid to provide a push action.<\/p>\n

Many varieties and configurations,\u00a0including: Tubular Solenoids<\/a>, Open Frame Solenoids<\/a>, Low Profile Solenoids<\/a> e Magnetic Latching Solenoids<\/a>.<\/p>\n

Example linear<\/u>\u00a0applications include door locks, control valves,\u00a0pinch valves, interlocks, printers and diverters.<\/p>\n

\"rotary<\/a>Our range of \u00a0rotary solenoids<\/strong><\/a>\u00a0 employs 3 inclined ball races to convert linear motion to rotary and \u00a0e offer high-speed operation and strokes of up to 95 degrees of rotation. Their compact design\u00a0provide higher starting force \/ torque than linear solenoids and can be unidirectional or bidirectional depending on the needs of the application<\/p>\n

Example rotary applications include<\/u>\u00a0 lasers, shutters, processing machinery, medical equipment, industrial sewing machines and diverter.<\/p>\n

Our solenoids are manufactured by\u00a0NSF Controls<\/a>, part of the Comestero Sistemi Group since 1997<\/p>\n

If\u00a0you are looking for a new electromagnet or are looking for advice<\/u><\/strong>, contact us by clicking here<\/a>, our technicians will recommend the best product for your needs.<\/p>\n

Choice of the electromagnet<\/h4>\n

To achieve optimal operation and long life from an electromagnet, attention must be paid to the choice and use. The best electromagnet for a particular application is generally the smallest that will provide sufficient traction and will not burn out.<\/p>\n

Below are the various points that must be taken into consideration for the choice:<\/p>\n

\"elettromagneti<\/p>\n