Linear electromagnetic motor

FIELD: electrical engineering.

SUBSTANCE: proposed motor incorporates cylindrical stator 1 accommodating coil 2 and armature 3 representing cylinder 4 with disk section 5. Guide case 6 made from ferromagnetic material adjoins the stator, case cross section being smaller than that of stator. Said motor comprises also guide case cover 7, plain bearings 8 and 9, return spring 10 and damping washer 11. Guide case top part adjoining cover 7 has inner circular ledge that fairs with armature disk section side surface by its diametre. Said inner circular ledge is connected via technological gap A with said armature disk section side surface to allow magnetic flux passage and armature retention at initial stage of its travel.

EFFECT: higher stabilisation of impact power.

1 dwg

 

The invention relates to electric machines and can be used to create electromagnetic presses, hammers and other pulsed devices with the translational motion of the working bodies.

Known linear electromagnetic motor driving the working body press [A.S. 821019 the USSR, Ál 21J 7/30. Electromagnetic press / Avivian, GPU, Gaiter, Vintagein. No. 2767111/25-27; Appl. 23.05.79; publ. 15.04.81, bull. No. 14 - 2 C.], consisting of a stator mounted therein a coil and armature return springs and retainers with adjusting screws to hold the anchor at the stage start. The disadvantage of the electromagnetic motor with restraint in the form of mechanical latches is unstable engine operation associated with the volatility efforts breakdown with clamps (wear, lubrication and other), as well as an increased noise level.

Also known linear electromagnetic motor retention anchors [U.S. Pat. 59342 U1 RF, MPK H02K 33/02. Linear electromagnetic motor retention anchors / Vigasin, Cmosens, Avelgem, Vagarin; applicant and patentee of the GOU VPO Kurgan state University. No. 2006127919/22; Appl. 31.07.2006; publ. 10.12.2006, bull. No. 34 - 4 C.], containing a cylindrical stator fixed inside the winding, anchor, consisting of cylindrical and disk parts, recoil spring, guide the second housing and restraint anchors, located in the lid of the guide housing. The holding device is made in the form of a flat cylindrical magnet with external attracted armature, this role is performed by a flat disc portion of the combined motor armature. The disadvantages of this electromagnetic motor with a holding device in the form of optional managed electromagnet is design complexity, low reliability and significant cost of production.

The undoubted advantage of these structures linear electromagnetic motors is the increase of the impact energy by holding the armature at the stage start. However, the principle of operation of the existing restraint systems require the use of additional support mechanisms in the form of mechanical latches or controlled electromagnets.

These drawbacks are eliminated in the design of the linear electromagnetic motor [U.S. Pat. 2084071 of the Russian Federation, IPC NC 33/02, 01F 7/16, 21J 7/30. Linear electromagnetic motor / GPU, Wounaan; applicant and patentee of the Institute of mining of SB RAS. No. 95110459/07; Appl. 22.06.95; publ. 10.07.97, bull. No. 19 - 4 C.], which is the closest analogue of the proposed technical solutions (prototype). Linear electromagnetic motor includes a cylindrical stator with the size of the military inside the coil and armature, made in the form of a cylinder with a disk part, adjacent to the stator cylindrical guide body made of ferromagnetic material with a smaller cross-sectional area relative to the stator, bearings and return spring. The guide body is made along with the cover and is mounted for contact with the outside disk part of the anchor that ensures retention of the anchor in the initial stage of the movement.

The fundamental difference between the design of the prototype from the above is that in the prototype retention anchor occurs without the use of additional support mechanisms. The anchor gets going when the magnitude of the current pick reaches the set value, and the electromagnetic force exceeds the force of the anchor.

Because the design of the prototype of the guide body is in contact with the external disk part of the anchor at the beginning of each cycle, between two ferromagnetic surfaces, an additional force due to the residual magnetization affecting the force holding the armature. Therefore, a significant drawback of the design of the prototype is the instability of the impact energy.

The task of the invention is to stabilize the impact energy of the linear electromagnetic motor.

The specified weight is and is achieved by in the linear electromagnetic motor contains a stator located inside the coil and armature, made in the form of a cylinder with a disk part, adjacent to the stator guide body made of ferromagnetic material with a smaller cross-sectional area relative to the stator, bearings and a return spring, the guide body has an internal annular ledge, conjugate to the diameter of a lateral surface of the disk portion of the anchor, and is installed with the possibility of contactless electromagnetic interaction with the side surfaces of the disk portion of the anchor.

The drawing shows the construction of the linear electromagnetic motor during driving of the anchor into the hold.

The proposed linear electromagnetic motor includes a cylindrical stator 1 is placed inside the coil 2 and the armature 3, is made in the form of a cylinder 4 with the disk part 5 adjacent to the stator guide body 6 made of a ferromagnetic material with a smaller cross-sectional area relative to the stator 1, the cover guide body 7, the bearings 8, 9, a return spring 10 and a damping washer 11. The guide body 6 in the upper part adjacent to the cover 7 has an internal annular ledge providing a contactless electromagnetic vzaimode the op perate with the side surfaces of the disk part 5 of the armature 3 via the technological gap Δ. The outer end surface of the cylindrical part 4 of the anchor 3 and the inner end surface of the disk part 5 of the armature 3 is formed with the stator working air gaps δ1and δ2. The technological gap Δ eliminates mechanical interaction between the inner annular protrusion and the side surface of the disk portion of the anchor in the places of their contactless interface.

Linear electromagnetic motor operates as follows. In the initial state, the anchor 3 under the force of the return spring 10 is in its extreme upper position, that is, the outer disk portion 5 of the anchor 3 tightly pojate to the damping washer 11.

When applying to the coil 2 voltage pulse by increasing the current, a magnetic circuit is excited by the magnetic flux f, which successively closes through the cylindrical section 4 and disk 5 parts of the armature 3, the guide body 6, a cylindrical stator 1, the technological gap Δ and the working air gaps δ1and δ2.

At the initial current flow through the coil 2, the force arising between the parts of the annular protrusion and the side surface of the disk portion of the anchor exceeds the force in the working air gap δ1and δ2i.e. Fy>Fδ1+Fδ2and the anchor 3 remains stationary. In the drawing indicates the position of the armature 3, in which Wuxi is their retention of F yreaches the maximum value. The main magnetic flux f is closed contour: a cylindrical stator 1, the guide body 6, the technological gap Δ, the disk portion 5 and a cylindrical portion 4 of the anchor 3, working air gap δ1the cylindrical stator 1 and partially air gap δ2.

Upon increase of current in the circuit of the coil 2 and the increase of the main magnetic flux f is the saturation of the circuit containing the guide body 6, due to its design with a smaller cross-sectional area relative to the stator 1. This increases the magnetic resistance of the guide body 6 and the redistribution path circuit of the main part of the magnetic flux f: a stator 1, a working air gap δ2disc portion 5 and a cylindrical portion 4 of the anchor 3, working air gap δ1the stator 1. Since the time when the force in the working gap δ1and δ2will exceed the force, Fδ1+Fδ2>Fyand the magnetic system of the engine will provide the necessary supply of magnetic energy, there is separation of armature 3 and accelerated its movement.

Disabling pulse voltage after the completion of the stroke of the armature 3 under the force of the return spring 10 is returned to its original state. Kinetic energy when in the vrata anchor extinguished in the damping washer 11, that reduces the mechanical load from the shock and noise.

The use of the design of the linear electromagnetic motor ferromagnetic guide housing with an internal annular ledge, conjugate to the diameter of a lateral surface of the disk portion of the anchor, provides at the stage of starting the passage of the main part of the magnetic flux through the side surface of the disk portion of the anchor, which leads to a contactless retention anchors at the stage start and, thus, allows you to save the effort of holding the required process level regardless of the magnetic state of the ferromagnetic elements of the linear electromagnetic motor, i.e. to stabilize the energy of the blow.

Linear electromagnetic motor, containing a cylindrical stator located inside the coil and armature, made in the form of a cylinder with a disk part, adjacent to the stator guide body made of ferromagnetic material with a smaller cross-sectional area relative to the stator, bearings and a return spring, wherein the guide body has an internal annular ledge, conjugate to the diameter of a lateral surface of the disk portion of the anchor.



 

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