Drum is used as an internal memory. Of aluminum drum, the drum is coated magnetic material to store data. Drum rotation speed is high, so the access speed. It uses the saturation magnetic recording head from fixed to floating head development, from the use of magnetic glue developed to continuous magnetic media by electroplating. These are Drawer Magnet later laid the foundation for disk storage.
The biggest drawback is the drum utilization is not high, only the surface layer of a large cylinder for storage, use both sides of the disk to store, apparently utilization is much higher. Therefore, when the disk appears, the drum was eliminated.
Drum is a key component of the camera, and its performance has a direct impact on the quality records, so use should be doubly care to prolong its life.
Ferrit haltemagnet
2013年9月3日星期二
Magnetic grid scale performance
Magnetic scale ulnar body may meet certain requirements of the hard magnetic alloy. Can also be coated with a layer of hard magnetic alloy magnetic material. Made of magnetic scale on the magnetic properties of hard magnetic alloys should have the following requirements:
1) good magnetic material should have a larger remanence and coercivity, ie material hysteresis loop should be bigger than the fat.
2) good magnetic name tags homogeneity of the magnetic material more uniform as possible to ensure that after the recording magnetic remanence equal in magnitude, otherwise it will affect the accuracy of the magnetic grid.
3) good magnetic stability of materials for the magnetic remanence after the time there should not extend as soon weaken performance.
4) good mechanical properties of the material should have high mechanical strength, hardness and abrasion resistance, easy to machine and less susceptible to external changes in temperature and humidity.
5) to ensure a certain degree of frequency characteristics of the residual magnetization in a record on the request of the desired frequency (wavelength) of the wave.
The hard magnetic Drawer Magnet alloy used Cu-Ni-Fe alloy or Fe-Cr-Co alloy; conventional magnetic coating composition is Ni, Co, P.
1) good magnetic material should have a larger remanence and coercivity, ie material hysteresis loop should be bigger than the fat.
2) good magnetic name tags homogeneity of the magnetic material more uniform as possible to ensure that after the recording magnetic remanence equal in magnitude, otherwise it will affect the accuracy of the magnetic grid.
3) good magnetic stability of materials for the magnetic remanence after the time there should not extend as soon weaken performance.
4) good mechanical properties of the material should have high mechanical strength, hardness and abrasion resistance, easy to machine and less susceptible to external changes in temperature and humidity.
5) to ensure a certain degree of frequency characteristics of the residual magnetization in a record on the request of the desired frequency (wavelength) of the wave.
The hard magnetic Drawer Magnet alloy used Cu-Ni-Fe alloy or Fe-Cr-Co alloy; conventional magnetic coating composition is Ni, Co, P.
2013年9月2日星期一
why the magnetic coil is energized
Open Category: Amp RULE
With internal core, the use of a current through a coil it like a magnet with a magnetic device called a solenoid, English Scientific name: Solenoid usually made from strip or
Horseshoe. Core magnetic systems magnetization easy to use, and easy to disappear magnetic soft iron or silicon to the system to do. Such a magnetic solenoid when energized, power outages after disappeared. Electricity
Magnet has many advantages: the presence or absence of magnetic solenoid, you can use pass, off current control. The size of the magnetic strength of the current can be used or the number of turns of the coil to the control, but also can be changed
Variable resistance control current to control the size of magnetic size. Electromagnets in everyday life has an extremely wide range of applications. Electromagnet is a current magnetic effect (electrophysiological magnetic) of a
Applications, and life are closely connected, such as electromagnetic relays, electromagnetic crane, magnetic levitation trains.
Solenoid with internal core called electromagnets. When inserted into the core inside the solenoid is energized, the solenoid is energized the magnetic core magnetization. Magnetized core also
Into a magnet, so that the two magnetic fields overlap each other, so that a magnetic solenoid greatly enhanced. For the electromagnet magnetic stronger core system usually
Into a horseshoe. But note that the coil wound on the core horseshoe opposite, while clockwise to counter-clockwise on the other side. If around the same two coils on the core magnetization for
Using the offset each other, so that no significant magnetic core. In addition, the electromagnet with a soft iron core to do, rather than using steel to do. Otherwise, once the steel is magnetized, it will maintain long-term
Magnetic and not demagnetized, then the strength of the magnetic current can not be used to control the size, and lose the advantages of the electromagnet should
The invention of the electromagnet
In 1822, French physicist Arago and Gay-Lussac found that when the current through the winding which has iron, it can make the iron wire magnetized. This is actually the power-
Magnet principle was originally discovered. 1823, Sturgeon also did a similar experiment: He is not in a U-shaped iron bar magnet stick on bare copper around the 18 laps, when
Copper and voltaic cell is turned on, around the U-shaped iron rods the copper coils which produce a magnetic field intensity, so that the U-shaped iron rod into a piece of "electromagnet." Such electrical
Magnetic energy than the permanent magnet can be big release times, it can pick up more than 20 times its weight of iron, and when the power is cut off, U-shaped iron bar on what iron also suck live, re-
Become an ordinary iron bar.
Sturgeon electromagnet invented to make people see the magnetic energy to electrical energy into the bright future of this invention soon in the United Kingdom, cup magnet the United States and some Western European countries biography of coastal
Sowing open.
1829, U.S. scientist Henry Sturgeon electricity electromagnet device made some innovations, insulated wire instead of bare copper wire, copper wire so do not worry about being too close to
The short circuit. As the wire with the insulation layer, they can be tightly wound together around the enclosure, the more intensive the coil, the stronger the magnetic field, so that a large
Large increase the capacity of magnetic energy into electrical energy. To 1831, Henry trial out an update electromagnet, although its volume is not large, but it can pick up a
Tons of iron.
The invention also enables the electromagnet generator power has been greatly improved.
Electromagnet Description: DC solenoid and electromagnet can be divided into two major types of AC solenoids. If in accordance with the purpose to divide the electromagnet can mainly be divided into the following five categories: (
1) traction magnet - pulling mechanism is mainly used to open or close the valves, in order to perform automatic control tasks. (2) lifting magnet - used as a lifting
Lifting device ingots, steel, iron ore and other ferromagnetic materials. (3) brake solenoid - mainly used for braking the motor in order to achieve accurate parking purposes.
(4) Automatic electrical electromagnetic system - such as electromagnetic relays and contactors electromagnetic system, automatic switch and operation of the electromagnetic solenoid release and so on. (5) Others
Way solenoid - such as grinder magnetic chuck and electromagnetic vibrator.
Amps RULE
Open Category: Physics
RULE
Represent current and current excitation magnetic field in the direction of the relationship between the sense line is set, also known as the right-hand screw rule.
(1) powered straight wire is given in amperes (amps RULE a): with the right hand holding the straight wire is energized so that the thumb pointing direction of the current, then four fingers pointing is
The direction of the magnetic induction lines surround
(2) Solenoid is given in amperes (amps given the two): with the right hand holding the solenoid is energized, the four fingers bent and current in the same direction, then under the thumb
That end of the N pole of the solenoid is energized
Nature
Line current in amperes given then for a short straight line current also apply. Ring current line currents can be seen as composed of many small pieces, each with a short straight line current current
The amp is determined given the central axis of the ring current direction of magnetic induction. Get up on the ring current superimposed central axis direction of magnetic field lines. Linear current
Amp setting is basic, the ring current in amperes can be determined by a straight line current in amperes is exported straight current in amperes given the linear motion of the charge for the magnetic field generated
Also applies, when the current direction is the same moving direction and the positive charge and negative charge movement in the opposite direction.
The HC Oersted magnetic effect of current experiments and other series of experiments, inspired, A.-M. Amp recognize the essence of current magnetic phenomena, to involve current, magnet
The various interactions between the current attributed to the interaction, for searching for the current element of the basic problems of interaction law. In order to overcome the current element can not be directly isolated
Measurement difficulties, amps designed four experiments showing zero and accompanied by thorough theoretical analysis of the results obtained. However, due to electromagnetic effects amp holding action at a distance concepts
, Was imposed in the theoretical analysis of the two current elements along the connection between the force assumptions, expectations obeys Newton's third law, the conclusion is wrong. The above formula is rejecting the erroneous
The assumption that the force along the connection, the amended result. Close-up view of the role should be understood as the current element produces a magnetic field, the magnetic field on which the current element subjected for another
Force.
Ampere's law, the Coulomb's law rather, the magnetic effect of the basic experimental laws, which determines the nature of the magnetic field, the way of calculating the current interaction.
Ampere force formula
Current element I1dι right away γ12 current element I2dι another force df12 is:
μ0 I1I2dι2 × (dι1 × γ12)
df12 = -------------
4π γ123
Where dι1, dι2 direction is the direction of current; γ12 pointing I2dι from I1dι radius vector. Ampere's law can be divided into two parts. One is the current element Idι
(I.e. the I1dι) in γ (i.e. the γ12) magnetic field generated at
μ0 Idι × γ
dB = -------
4π γ3
This is the Bi - Sa - Pull the law. The second is the current element Idl (ie above I2dι2) in a magnetic field B, the force exerted df (ie above df12) as follows:
df = Idι × B
With internal core, the use of a current through a coil it like a magnet with a magnetic device called a solenoid, English Scientific name: Solenoid usually made from strip or
Horseshoe. Core magnetic systems magnetization easy to use, and easy to disappear magnetic soft iron or silicon to the system to do. Such a magnetic solenoid when energized, power outages after disappeared. Electricity
Magnet has many advantages: the presence or absence of magnetic solenoid, you can use pass, off current control. The size of the magnetic strength of the current can be used or the number of turns of the coil to the control, but also can be changed
Variable resistance control current to control the size of magnetic size. Electromagnets in everyday life has an extremely wide range of applications. Electromagnet is a current magnetic effect (electrophysiological magnetic) of a
Applications, and life are closely connected, such as electromagnetic relays, electromagnetic crane, magnetic levitation trains.
Solenoid with internal core called electromagnets. When inserted into the core inside the solenoid is energized, the solenoid is energized the magnetic core magnetization. Magnetized core also
Into a magnet, so that the two magnetic fields overlap each other, so that a magnetic solenoid greatly enhanced. For the electromagnet magnetic stronger core system usually
Into a horseshoe. But note that the coil wound on the core horseshoe opposite, while clockwise to counter-clockwise on the other side. If around the same two coils on the core magnetization for
Using the offset each other, so that no significant magnetic core. In addition, the electromagnet with a soft iron core to do, rather than using steel to do. Otherwise, once the steel is magnetized, it will maintain long-term
Magnetic and not demagnetized, then the strength of the magnetic current can not be used to control the size, and lose the advantages of the electromagnet should
The invention of the electromagnet
In 1822, French physicist Arago and Gay-Lussac found that when the current through the winding which has iron, it can make the iron wire magnetized. This is actually the power-
Magnet principle was originally discovered. 1823, Sturgeon also did a similar experiment: He is not in a U-shaped iron bar magnet stick on bare copper around the 18 laps, when
Copper and voltaic cell is turned on, around the U-shaped iron rods the copper coils which produce a magnetic field intensity, so that the U-shaped iron rod into a piece of "electromagnet." Such electrical
Magnetic energy than the permanent magnet can be big release times, it can pick up more than 20 times its weight of iron, and when the power is cut off, U-shaped iron bar on what iron also suck live, re-
Become an ordinary iron bar.
Sturgeon electromagnet invented to make people see the magnetic energy to electrical energy into the bright future of this invention soon in the United Kingdom, cup magnet the United States and some Western European countries biography of coastal
Sowing open.
1829, U.S. scientist Henry Sturgeon electricity electromagnet device made some innovations, insulated wire instead of bare copper wire, copper wire so do not worry about being too close to
The short circuit. As the wire with the insulation layer, they can be tightly wound together around the enclosure, the more intensive the coil, the stronger the magnetic field, so that a large
Large increase the capacity of magnetic energy into electrical energy. To 1831, Henry trial out an update electromagnet, although its volume is not large, but it can pick up a
Tons of iron.
The invention also enables the electromagnet generator power has been greatly improved.
Electromagnet Description: DC solenoid and electromagnet can be divided into two major types of AC solenoids. If in accordance with the purpose to divide the electromagnet can mainly be divided into the following five categories: (
1) traction magnet - pulling mechanism is mainly used to open or close the valves, in order to perform automatic control tasks. (2) lifting magnet - used as a lifting
Lifting device ingots, steel, iron ore and other ferromagnetic materials. (3) brake solenoid - mainly used for braking the motor in order to achieve accurate parking purposes.
(4) Automatic electrical electromagnetic system - such as electromagnetic relays and contactors electromagnetic system, automatic switch and operation of the electromagnetic solenoid release and so on. (5) Others
Way solenoid - such as grinder magnetic chuck and electromagnetic vibrator.
Amps RULE
Open Category: Physics
RULE
Represent current and current excitation magnetic field in the direction of the relationship between the sense line is set, also known as the right-hand screw rule.
(1) powered straight wire is given in amperes (amps RULE a): with the right hand holding the straight wire is energized so that the thumb pointing direction of the current, then four fingers pointing is
The direction of the magnetic induction lines surround
(2) Solenoid is given in amperes (amps given the two): with the right hand holding the solenoid is energized, the four fingers bent and current in the same direction, then under the thumb
That end of the N pole of the solenoid is energized
Nature
Line current in amperes given then for a short straight line current also apply. Ring current line currents can be seen as composed of many small pieces, each with a short straight line current current
The amp is determined given the central axis of the ring current direction of magnetic induction. Get up on the ring current superimposed central axis direction of magnetic field lines. Linear current
Amp setting is basic, the ring current in amperes can be determined by a straight line current in amperes is exported straight current in amperes given the linear motion of the charge for the magnetic field generated
Also applies, when the current direction is the same moving direction and the positive charge and negative charge movement in the opposite direction.
The HC Oersted magnetic effect of current experiments and other series of experiments, inspired, A.-M. Amp recognize the essence of current magnetic phenomena, to involve current, magnet
The various interactions between the current attributed to the interaction, for searching for the current element of the basic problems of interaction law. In order to overcome the current element can not be directly isolated
Measurement difficulties, amps designed four experiments showing zero and accompanied by thorough theoretical analysis of the results obtained. However, due to electromagnetic effects amp holding action at a distance concepts
, Was imposed in the theoretical analysis of the two current elements along the connection between the force assumptions, expectations obeys Newton's third law, the conclusion is wrong. The above formula is rejecting the erroneous
The assumption that the force along the connection, the amended result. Close-up view of the role should be understood as the current element produces a magnetic field, the magnetic field on which the current element subjected for another
Force.
Ampere's law, the Coulomb's law rather, the magnetic effect of the basic experimental laws, which determines the nature of the magnetic field, the way of calculating the current interaction.
Ampere force formula
Current element I1dι right away γ12 current element I2dι another force df12 is:
μ0 I1I2dι2 × (dι1 × γ12)
df12 = -------------
4π γ123
Where dι1, dι2 direction is the direction of current; γ12 pointing I2dι from I1dι radius vector. Ampere's law can be divided into two parts. One is the current element Idι
(I.e. the I1dι) in γ (i.e. the γ12) magnetic field generated at
μ0 Idι × γ
dB = -------
4π γ3
This is the Bi - Sa - Pull the law. The second is the current element Idl (ie above I2dι2) in a magnetic field B, the force exerted df (ie above df12) as follows:
df = Idι × B
the electromagnet data
Electromagnet
With internal core, the use of a current through a coil it like a magnet with a magnetic device called a solenoid, usually made from bar or horseshoe. Easy to use core
Magnetization, magnetic and easy to disappear to soft iron or silicon steel making. Such a magnetic solenoid when energized, power outages after disappeared. Electromagnet has many advantages: Electromagnetic
Presence or Drawer Magnet absence of ferromagnetism can be used to pass, off current control. The size of the magnetic strength of the current can be used or the number of turns to control. Electromagnets in everyday life has an extremely
Wide range of applications. Electromagnet is a current magnetic effect (electrophysiological magnetic) of an application, and life are closely connected, such as electromagnetic relays, magnetic crane, magnetic levitation train
And so on.
The invention of the electromagnet
In 1822, French physicist Arago and Gay-Lussac found that when the current through the winding which has iron, it can make the iron wire magnetized. This is actually the power-
Magnet principle was originally discovered. 1823, Sturgeon also did a similar experiment: He is not in a U-shaped iron bar magnet stick on bare copper around the 18 laps, when
Copper and voltaic cell is turned on, around the U-shaped iron rods the copper coils which produce a magnetic field intensity, so that the U-shaped iron rod into a piece of "electromagnet." Such electrical
Magnetic energy than the permanent magnet can be big release times, it can pick up more than 20 times its weight of iron, and when the power is cut off, U-shaped iron bar on what iron also suck live, re-
Become an ordinary iron bar.
Sturgeon cup magnet electromagnet invented to make people see the magnetic energy to electrical energy into the bright future of this invention soon in the United Kingdom, the United States and some Western European countries biography of coastal
Sowing open.
1829, U.S. scientist Henry Sturgeon electricity electromagnet device made some innovations, insulated wire instead of bare copper wire, copper wire so do not worry about being too close to
The short circuit. As the wire with the insulation layer, they can be tightly wound together around the enclosure, the more intensive the coil, the stronger the magnetic field, so that a large
Large increase the capacity of magnetic energy into electrical energy. To 1831, Henry trial out an update electromagnet, although its volume is not large, but it can pick up a
Tons of iron.
The invention also enables the electromagnet generator power has been greatly improved.
Electromagnet Description: DC solenoid and electromagnet can be divided into two major types of AC solenoids. If in accordance with the purpose to divide the electromagnet can mainly be divided into the following five categories: (
1) traction magnet - pulling mechanism is mainly used to open or close the valves, in order to perform automatic control tasks. (2) lifting magnet - used as a lifting
Lifting device ingots, steel, iron ore and other ferromagnetic materials. (3) brake solenoid - mainly used for braking the motor in order to achieve accurate parking purposes.
(4) Automatic electrical electromagnetic system - such as electromagnetic relays and contactors electromagnetic system, automatic switch and operation of the electromagnetic solenoid release and so on. (5) Others
Way solenoid - such as grinder magnetic chuck and electromagnetic vibrator.
With internal core, the use of a current through a coil it like a magnet with a magnetic device called a solenoid, usually made from bar or horseshoe. Easy to use core
Magnetization, magnetic and easy to disappear to soft iron or silicon steel making. Such a magnetic solenoid when energized, power outages after disappeared. Electromagnet has many advantages: Electromagnetic
Presence or Drawer Magnet absence of ferromagnetism can be used to pass, off current control. The size of the magnetic strength of the current can be used or the number of turns to control. Electromagnets in everyday life has an extremely
Wide range of applications. Electromagnet is a current magnetic effect (electrophysiological magnetic) of an application, and life are closely connected, such as electromagnetic relays, magnetic crane, magnetic levitation train
And so on.
The invention of the electromagnet
In 1822, French physicist Arago and Gay-Lussac found that when the current through the winding which has iron, it can make the iron wire magnetized. This is actually the power-
Magnet principle was originally discovered. 1823, Sturgeon also did a similar experiment: He is not in a U-shaped iron bar magnet stick on bare copper around the 18 laps, when
Copper and voltaic cell is turned on, around the U-shaped iron rods the copper coils which produce a magnetic field intensity, so that the U-shaped iron rod into a piece of "electromagnet." Such electrical
Magnetic energy than the permanent magnet can be big release times, it can pick up more than 20 times its weight of iron, and when the power is cut off, U-shaped iron bar on what iron also suck live, re-
Become an ordinary iron bar.
Sturgeon cup magnet electromagnet invented to make people see the magnetic energy to electrical energy into the bright future of this invention soon in the United Kingdom, the United States and some Western European countries biography of coastal
Sowing open.
1829, U.S. scientist Henry Sturgeon electricity electromagnet device made some innovations, insulated wire instead of bare copper wire, copper wire so do not worry about being too close to
The short circuit. As the wire with the insulation layer, they can be tightly wound together around the enclosure, the more intensive the coil, the stronger the magnetic field, so that a large
Large increase the capacity of magnetic energy into electrical energy. To 1831, Henry trial out an update electromagnet, although its volume is not large, but it can pick up a
Tons of iron.
The invention also enables the electromagnet generator power has been greatly improved.
Electromagnet Description: DC solenoid and electromagnet can be divided into two major types of AC solenoids. If in accordance with the purpose to divide the electromagnet can mainly be divided into the following five categories: (
1) traction magnet - pulling mechanism is mainly used to open or close the valves, in order to perform automatic control tasks. (2) lifting magnet - used as a lifting
Lifting device ingots, steel, iron ore and other ferromagnetic materials. (3) brake solenoid - mainly used for braking the motor in order to achieve accurate parking purposes.
(4) Automatic electrical electromagnetic system - such as electromagnetic relays and contactors electromagnetic system, automatic switch and operation of the electromagnetic solenoid release and so on. (5) Others
Way solenoid - such as grinder magnetic chuck and electromagnetic vibrator.
2013年9月1日星期日
permanent lifting Precautions
1 lifting, first by lifting the workpiece surface is clean, if rust leather and spurs should be cleaned. Permanent lifting of the center of gravity of the workpiece centerline best lines coincide, then
Jack placed on the work surface, rotate the handle from the "-" sign position to the "+" direction of rotation to limit sales. Check the security lever is automatically locked ramp,
Then lifting.
(2) lift the workpiece when Magnetic Grates the non-overloading, non-human from below through the workpiece, the workpiece to be hanging temperature and ambient temperature less than 80 degrees, no severe vibration and shock.
3 lifting cylindrical workpiece, keep B-groove connection with the workpiece in contact angle of two straight lines, so it's only rated from gravity gravity from 30% -50%.
4 After completion of lifting, pressing inward to understand the handle button on the handle off the security key and security detachment. Handle the "+" to "-" sign to the rotation stopper pin. Make
Lifter is turned off, knock off parts and jack off.
Jack placed on the work surface, rotate the handle from the "-" sign position to the "+" direction of rotation to limit sales. Check the security lever is automatically locked ramp,
Then lifting.
(2) lift the workpiece when Magnetic Grates the non-overloading, non-human from below through the workpiece, the workpiece to be hanging temperature and ambient temperature less than 80 degrees, no severe vibration and shock.
3 lifting cylindrical workpiece, keep B-groove connection with the workpiece in contact angle of two straight lines, so it's only rated from gravity gravity from 30% -50%.
4 After completion of lifting, pressing inward to understand the handle button on the handle off the security key and security detachment. Handle the "+" to "-" sign to the rotation stopper pin. Make
Lifter is turned off, knock off parts and jack off.
the performance characteristics of the magnetic drum
1 depleted iron ore by crushing or broken in after roughing, excluding waste rock, etc., improve quality, reduce process under a load.
(2) reduction of hematite Magnetic Grates closed for roasting operations will not fully restore ore sorting, return and then burn.
3 for the ceramics industry will porcelain mud mixed iron removal, improve quality of ceramic products.
4 burning coal, foundry sand, refractory, and other lines of iron work to be required.
(2) reduction of hematite Magnetic Grates closed for roasting operations will not fully restore ore sorting, return and then burn.
3 for the ceramics industry will porcelain mud mixed iron removal, improve quality of ceramic products.
4 burning coal, foundry sand, refractory, and other lines of iron work to be required.
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