JP2001224157A - Electromagnetic reciprocal drive mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic reciprocal drive mechanism that assures higher drive efficiency. SOLUTION: This drive mechanism is provided with a permanent magnet 19, held with a holding body 20 provided to a reciprocal member, a laminated core 21 and electromagnetic coils 22A, 22B for energizing the laminated core 21. The laminated core 21 is structured, by laminating thinner pieces forming in parallel three projected portions 32A, 32B, 32C and independent electromagnetic coils 22A, 22B are provided in the recesses 33A, 33B formed between these projected portions 32A, 32B. In static state, the magnetic poles 19N, 19S, of the permanent magnet 19 are provided opposed to the recesses 33A, 33B. For example, when the power is fed alternately to both electromagnetic coils 22A, 22B, the polarity of the projected portions 32A, 32B, 32C is sequentially switched and thereby the reciprocal member makes the reciprocal motion together with the permanent magnet 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic reciprocating drive mechanism for use in a Stirling cycle refrigerator or the like, which reciprocates a reciprocating member provided with a permanent magnet in a changing magnetic field.

[0002]

Conventionally, as this type of electromagnetic reciprocating drive mechanism, a permanent magnet is held by a non-magnetic spider (holding body), and a laminated core wound with an electromagnetic coil is brought close to the permanent magnet group. What is provided is known. An alternating magnetic field is generated by passing an alternating current through the electromagnetic coil, and the reciprocating member including the spider holding the permanent magnet is reciprocated by the alternating magnetic field.

However, in these electromagnetic reciprocating drive mechanisms, the efficiency of the reciprocating motion is not sufficient, and a more efficient structure has been demanded.

[0004] In the conventional structure, a second laminated core for forming a magnetic circuit by receiving magnetic lines of force from the laminated core is provided on the opposite side with the permanent magnet interposed therebetween.
Due to the provision of the second laminated core, there is a problem that the size of the electromagnetic reciprocating drive mechanism is increased.

An object of the present invention is to solve the above problems and to provide an electromagnetic reciprocating drive mechanism with high drive efficiency.
It is another object of the present invention to provide a miniaturized electromagnetic reciprocating drive mechanism without reducing the driving force.

[0006]

An electromagnetic reciprocating drive mechanism according to the present invention includes a reciprocating member having a holding member for holding a permanent magnet;
In an electromagnetic reciprocating drive mechanism comprising a laminated core provided in proximity to the permanent magnet and an electromagnetic coil for exciting the laminated core, the laminated core is formed by forming three or more protrusions in parallel. Are stacked, and an independent electromagnetic coil is provided in each of the concave portions formed between these protruding portions, and the magnetic poles of the permanent magnet are opposed to each of the concave portions in a stationary state.

According to the present invention having the above-described structure, for example, by alternately energizing the respective electromagnetic coils, the protruding portions sandwiching these electromagnetic coils become magnetic poles, and the magnetic poles of the permanent magnet are formed in opposed concave portions. Attraction and repulsion with the protruding portion sandwiching the electromagnetic coil provided at the front end. As a result, the magnetic poles of the permanent magnet reciprocate between the protruding portions on both sides of the concave portion facing each other, and the reciprocating member having the holder holding the permanent magnet also reciprocates.

Further, in the electromagnetic reciprocating drive mechanism of the present invention, in claim 1, a magnetic body is provided in contact with the permanent magnet.

According to the present invention, as described above, a magnetic circuit is formed in which the lines of magnetic force generated from the laminated core pass through the permanent magnet and the magnetic conductor and return to the laminated core.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In the present embodiment, a description will be given using a Stirling cycle refrigerator. However, the present invention can be applied to other devices. FIG.
In the figure, reference numeral 1 denotes an apparatus main body composed of a cylinder part 2 and a body part 3, and these cylinder part 2 and body part 3 are made of stainless steel. The cylinder part 2 has a base part 4, an intermediate part 5, and a tip part 6.

The body 3 is provided inside the cylinder 2.
An internal cylinder 7 extending to the inside is provided, and a displacer 8 is housed in the internal cylinder 7 so as to be slidable in the axial direction of the internal cylinder 7. An expansion chamber E is formed between the tip of the inner cylinder 7 and the tip 6 of the cylinder portion 2, and the inside and the outside of the inner cylinder 7 are communicated by the gap 9. A regenerator 10 is provided on the outer periphery of the inner cylinder 7 in the intermediate portion 5 of the cylinder portion 2 and the inner cylinder 7 is provided on the base 4 of the cylinder portion 2.
A communication hole 11 that communicates the inside and outside is formed. Further, heat absorbing fins 12 are provided on the outer periphery of the tip of the inner cylinder 7,
Further, between the regenerator 10 and the communication hole 11, a radiation fin 13 is provided on the outer periphery of the inner cylinder 7. A path is formed from the inner end of the inner cylinder 7 to the compression chamber C in the inner cylinder 7 through the gap 9, the heat absorbing fin 12, the regenerator 10, the heat radiating fin 13, and the communication hole 11.

In the body 3, an electromagnetic reciprocating drive mechanism 16 is provided.
Is provided. The electromagnetic reciprocating drive mechanism 16 includes a piston 17 accommodated in the inner cylinder 7 so as to be slidable in the axial direction.
, A plurality of plate-shaped permanent magnets 19 disposed in a short cylindrical shape, and a spider 20 which is coaxially fixed to the piston 17 and holds the permanent magnets 19.
And a laminated core 21 fixed in the body 3 and surrounding the permanent magnet 19 in a cylindrical shape, and electromagnetic coils 22A and 22B for exciting the laminated core 21. The laminated core 21 is sandwiched and fixed between the inner cylinder 7 and the holding member 23. Further, reference numeral 24 denotes a spiral first leaf spring whose center portion is connected to the piston 17, 25 denotes a spiral second leaf spring which is connected to the first leaf spring 24 at an outer peripheral portion, and 26 denotes a spiral second leaf spring. A rod whose center is connected to the second leaf spring 25 controls the amplitude of the displacer 8.

The flakes, which are constituent units of the laminated core 21, are:
As shown in FIG. 2, a base 31, a first protrusion 32 </ b> A, a second protrusion 32 </ b> B, and a third protrusion 32 </ b> C formed at right angles to the base 31 and at equal intervals in parallel with each other And is formed in a substantially E-shape. The laminated core 21 is formed by laminating the thin pieces. Further, a first electromagnetic coil 22A is provided in a first concave portion 33A formed between the first projecting portion 32A and the second projecting portion 32B, and the second projecting portion 32B
A second electromagnetic coil 22B is disposed in a second concave portion 33B formed between the second electromagnetic coil 22B and the third protrusion 32C. These first
The second electromagnetic coils 22A and 22B are independent of each other.

The permanent magnet 19 mounted on the outer periphery of the spider 20 is provided with magnetic poles 19N and 19S in the reciprocating direction, and is provided on the N pole (magnetic pole 19N) side so as to be in contact with these magnetic poles 19N and 19S. The first magnetic conductor 34A has an S pole (magnetic pole 19S)
On the side, a second magnetic conductor 34B is attached to the spider 20. The ends of the first and second magnetic conductors 34A and 34B are
The protrusions 35N and 35S slightly protrude toward the laminated core 21 and the electromagnetic coils 22A and 22B.

In the stationary state, the permanent magnet 19 is in the second position.
The protrusions 35N, 35S formed at the ends of the first and second magnetic conductors 34A, 34B face the two electromagnetic coils 22A, 22B, respectively. The distance between the protrusions 35N and 35S at the ends of the two magnetic conductors 34A and 34B is the same as that of the laminated core
The distance between the projections 32A, 32B, 32C of the 21 is equal to or less than the interval.

Next, a first operation example of the electromagnetic reciprocating drive mechanism 16 will be described with reference to FIG. In the first example, the winding directions of the two electromagnetic coils 22A and 22B are the same, and the directions of the currents supplied to the two electromagnetic coils 22A and 22B are also the same.

The end (projection 35N) of the first magnetic conductor 34A attached to the N pole (magnetic pole 19N) of the permanent magnet 19 is an N pole, and is attached to the S pole (magnetic pole 19S). The second
The end (projection 35S) of the magnetic body 34B is an S pole.
When power is supplied to the first electromagnetic coil 22A provided in the first concave portion 33A of the laminated core 21, the first protruding portion 32A becomes an S pole and the second protruding portion 32B as shown in FIG. Becomes the N pole. As a result, the first magnetic conductor 34A attracts the first projection 32A and repels the second projection 32B, and the second magnetic conductor 34B attracts the second projection 32B. Fit. Therefore, the reciprocating member 18 moves to the first protrusion 32A side.
Here, when the electric power supplied to the first electromagnetic coil 22A is cut off and the electric power is supplied to the second electromagnetic coil 22B provided in the second concave portion 33B, the second electromagnetic coil 22A becomes second as shown in FIG. The projection 32B is an S pole, and the third projection 32C is an N pole. As a result, the first magnet 34A attracts the second protrusion 32B, and the second magnet 34B attracts the third protrusion 32C and repels the second protrusion 32B. Fit. Therefore,
The reciprocating member 18 moves to the third protrusion 33C side. In this manner, the power is alternately supplied to the first and second electromagnetic coils 22A and 22B, so that the reciprocating member 18 reciprocates.

In the Stirling cycle engine, when the reciprocating member 18 including the piston 17 moves toward the displacer 8, the piston 17 and the displacer 8 move.
The gas in the compression chamber C formed between the first and second compression chambers C is compressed, and the communication hole 11, the radiation fin 13, the regenerator 10, the heat absorption fin 12,
To the expansion chamber E between the distal end of the inner cylinder 7 and the distal end portion 6 and depresses the displacer 8. On the other hand, when the piston 17 moves in the opposite direction to the displacer 8, the inside of the compression chamber C becomes a negative pressure, and the gas flows into the expansion chamber E.
From the gap 9, heat absorbing fins 12, regenerator 10, heat radiating fins 13,
The liquid flows back to the compression chamber C in the internal cylinder 7 through the communication hole 11, thereby pushing up the displacer 8. During such a process, a reversible cycle consisting of two isothermal changes and an equal volume change is performed, and the heat absorbing fins 12 attached to the outer periphery of the tip of the inner cylinder 7 have a low temperature.
The radiating fins 13 provided on the outer periphery of the compression chamber C have a high temperature. When such a Stirling cycle engine is used as a refrigerator, the distal end 6 of the cylinder portion 2, that is, the heat absorbing fin is used.
What is necessary is just to attach the 12 side to the inside of the refrigerator and expose the base 4 of the cylinder portion 2, that is, the radiation fin 13 side, to the outside of the refrigerator to exchange heat.

According to the configuration of the electromagnetic reciprocating drive mechanism 16 as described above, the drive efficiency is improved. Further, a magnetic circuit is formed in which the magnetic lines of force emitted from the laminated core 21 pass through the permanent magnet 19 and the magnetic conductors 34A and 34B and return to the laminated core 21 again.
There is no need to provide a second laminated core on the side of the permanent magnet 19 opposite to the laminated core 21, and the electromagnetic reciprocating drive mechanism 16 can be reduced in size.

Next, a second operation example of the electromagnetic reciprocating drive mechanism 16 will be described with reference to FIG. Electromagnetic reciprocating drive mechanism 16
Is the same as that of the first operation example, but in the second operation example, the winding directions of the two electromagnetic coils 22A and 22B are the same, and the currents supplied to the two electromagnetic coils 22A and 22B are respectively different. Direction of each other, or both electromagnetic coils
With the winding directions of 22A and 22B reversed,
The directions of the currents supplied to A and 22B are the same.

Therefore, when power is supplied to the first electromagnetic coil 22A and the second electromagnetic coil 22B, for example, FIG.
As shown in (a), the first projection 32A has an S pole, the second projection 32B has an N pole, and the third projection 33C has an S pole. As a result, the first magnetic conductor 34A attracts the first protrusion 32A, repels the second protrusion 32B, and the second magnetic conductor 3A.
4B attracts the second protrusion 32B and the third protrusion 3B.
Repels 2C. Therefore, the reciprocating member 18 moves to the first protrusion 32A side. On the other hand, when the direction of the current flowing through the first electromagnetic coil 22A and the second electromagnetic coil 22B is reversed,
As shown in FIG. 4B, the first protrusion 32A has the N pole,
The projection 32B has the S pole, and the third projection 32C has the N pole. As a result, the first magnetic conductor 34A repels the first protrusion 32A and attracts the second protrusion 32B, and the second magnetic conductor 34B repels the second protrusion 32B. Together with the third protrusion 32C. Therefore, the reciprocating member 18 is the third
Move to the side of the protrusion 32C.

Next, a second embodiment of the present invention will be described with reference to FIG. The configurations of the laminated core 21 and the electromagnetic coils 22A and 22B formed by laminating the flakes are common to those of the first embodiment. Therefore, portions corresponding to those of the first embodiment are denoted by the same reference numerals. The description is omitted. Reference numeral 41 denotes a holder provided on the reciprocating member near the inner peripheral sides of the laminated core 21 and the electromagnetic coils 22A and 22B, and reference numeral 42 denotes a magnetic conductor attached to the inner peripheral side of the holder 41. Notches 43 are provided at both ends of the magnetic body 42 in the reciprocating direction.
Are provided in these notches 43, respectively.
And a second permanent magnet 44B. These permanent magnets 44A and 44B are plate-shaped, and the surfaces of the laminated core 21 and the electromagnetic coils 22A and 22B and the surface of the magnetic conductor 42 are magnetic poles. The first permanent magnet 44A is
The surface on the side of the laminated core 21 and the electromagnetic coil 22A is an N pole, and the surface on the side of the magnetic body 42 is an S pole. In the second permanent magnet 44B, the surface on the side of the laminated core 21 and the electromagnetic coil 22B is an S pole, and the surface on the side of the magnetic conductor 42 is an N pole. When stopped, both permanent magnets 44
A and 44B face both the electromagnetic coils 22A and 22B, respectively. The distance between the permanent magnets 44A and 44B is equal to or less than the distance between the protrusions 32A, 32B and 32C of the laminated core 21.

In the second embodiment, either the first operation example or the second operation example of the first embodiment can be performed. That is, in the first operation example, the winding directions of the two electromagnetic coils 22A and 22B are the same,
The direction of the current supplied to each of 22A and 22B is also made the same, and the supply and cutoff of the power to the first electromagnetic coil 22A and the supply and cutoff of the power to the second electromagnetic coil 22B are alternately repeated. In the second operation example, both electromagnetic coils 22
The winding directions of A and 22B are the same, and the directions of the currents supplied to the two electromagnetic coils 22A and 22B are reversed, or the winding directions of the two electromagnetic coils 22A and 22B are reversed.
The directions of the currents supplied to the two electromagnetic coils 22A and 22B are made the same, and the first electromagnetic coil 22A and the second
The direction of the current flowing through 2B is reversed every predetermined time. In each of the operation examples, each protruding portion 32A, 32B, 32
By sequentially switching the polarity of C, the reciprocating member reciprocates with the permanent magnets 44A and 44B.

Next, a third embodiment of the present invention will be described with reference to FIG. A thin piece, which is a constituent unit of the laminated core 51, includes a base 52, a first protruding portion 53A formed at right angles to the base 52, and formed in parallel at equal intervals.
, A third projecting portion 53C, and a fourth projecting portion 53D. The laminated core 51 is formed by laminating the thin pieces. Further, a first electromagnetic coil 55A is provided in a first concave portion 54A formed between the first projecting portion 53A and the second projecting portion 53B. A second electromagnetic coil 55B is provided in a second recess 54B formed between the second protrusion 53B and the third protrusion 53C. A third electromagnetic coil 55C is provided in a third concave portion 54C formed between the third projecting portion 53C and the fourth projecting portion 53D.

The spider 20, which is a holder, has a first
Are mounted side by side in the reciprocating direction. These permanent magnets 56, 57 are provided with magnetic poles 56N, 56S, 57N, 57S in the reciprocating direction, and have the same poles 56S, 57S facing each other. A first magnetic conductor 58A is provided on the N pole (magnetic pole 56N) side of the first permanent magnet 56 so as to be in contact with the magnetic poles 56N, 56S, 57N, 57S of these permanent magnets 56, 57. 57 S poles (magnetic pole 56S,
57S), the second magnetic conductor 58B is attached to the spider 20 on the N pole (magnetic pole 57N) side of the second permanent magnet 57, and the third magnetic conductor 58C is attached to the spider 20. The ends of the first and third magnetic conductors 58A and 58C and the center of the second magnetic conductor 58B are respectively connected to the laminated core 5A.
The protrusions 59N, 59S, 59N slightly protrude toward the side 1 and the electromagnetic coils 55A, 55B, 55C.

In the stopped state, each of the magnetic conductors 58A, 58A
The protrusions 59N, 59S, 59N formed on B, 58C face the respective electromagnetic coils 55A, 55B, 55C. Also, is the distance between the protrusions 59N, 59S, 59N of the magnetic conductors 58A, 58B, 58C the same as the distance between the protrusions 53A, 53B, 53C, 53D of the laminated core?
It is configured below.

Further, the number of protrusions of the laminated core is 5
More than two may be used. When the number of protrusions is n, the number of recesses and independent electromagnetic coils of the laminated core is n-
Becomes 1. Then, every other electromagnetic coil is divided into two groups, and supply and cutoff of power to the electromagnetic coils of each group are alternately repeated as in the first operation example. Alternatively, as in the second operation example, the directions of the currents supplied to the two groups of electromagnetic coils are opposite to each other, or the winding directions of the two groups of electromagnetic coils are opposite to each other, so that The direction of the flowing current is reversed every predetermined time. Thereby, the polarity of the protruding portion is sequentially switched, and the reciprocating member reciprocates with the permanent magnet. Especially when the number of electromagnetic coils is odd,
The method of the second operation example is preferable because the force applied to the reciprocating member when the polarity of the protruding portion is switched becomes more uniform.

[0028]

The electromagnetic reciprocating drive mechanism of the present invention comprises a reciprocating member having a holding member for holding a permanent magnet, a laminated core provided close to the permanent magnet, and an electromagnetic coil for exciting the laminated core. In the electromagnetic reciprocating drive mechanism configured, the laminated core is configured by laminating thin pieces each having three or more protrusions formed in parallel, and independent electromagnetic coils are respectively formed in recesses formed between these protrusions. Along with the provision, the magnetic poles of the permanent magnet are configured so as to face the respective recesses in a stationary state.For example, by alternately energizing the respective electromagnetic coils, the protruding portions sandwiching these electromagnetic coils become the magnetic poles, respectively. In addition, each magnetic pole of the permanent magnet attracts and repels a protruding portion sandwiching the electromagnetic coil provided in the opposing concave portion, whereby the magnetic pole of the permanent magnet protrudes on both sides of the opposing concave portion. Reciprocated between, because the reciprocating member is also to reciprocate with a holder holding the permanent magnets, thereby improving the driving efficiency of the electromagnetic reciprocating drive mechanism.

Further, in the electromagnetic reciprocating drive mechanism of the present invention, in claim 1, a magnetic body is provided in contact with the permanent magnet, and magnetic lines of force emitted from the laminated core pass through the permanent magnet and the magnetic body, and Since the magnetic circuit returning to the laminated core is formed, it is not necessary to provide the second laminated core on the side opposite to the permanent magnet, and the electromagnetic reciprocating drive mechanism can be downsized.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is a simplified explanatory view of a main part of the above.

FIG. 3 is an explanatory diagram showing an example of the operation.

FIG. 4 is an explanatory diagram showing another example of the operation of the above.

FIG. 5 is a simplified explanatory view of a main part showing a second embodiment of the present invention.

FIG. 6 is a simplified explanatory view of a main part showing a third embodiment of the present invention.

[Explanation of symbols]

 16 Electromagnetic reciprocating drive mechanism 18 Reciprocating member 19 Permanent magnet 19N, 19S Magnetic pole 20 Spider (holding body) 21 Laminated core 22A First electromagnetic coil (Electromagnetic coil) 22B Second electromagnetic coil (Electromagnetic coil) 32A First protrusion (Projecting portion) 32B second projecting portion (projecting portion) 32C third projecting portion 33A first concave portion (concave portion) 33B second concave portion (concave portion) 34A first magnetic conductor (magnetic conductor) 34B second Magnetic Conductor (Magnetic Conductor) 41 Holder 42 Magnetic Conductor 44A First Permanent Magnet (Permanent Magnet) 44B Second Permanent Magnet (Permanent Magnet) 51 Laminated Core 53A First Projection (Projection) 53B Second Projection Part (projection) 53C Third projection (projection) 53D Third projection (projection) 54A First depression (recess) 54B Second depression (recess) 54C Second depression (recess) 55A First electromagnetic coil (electromagnetic coil) 55B Second electromagnetic coil (electromagnetic coil) 55C Third electromagnetic coil (electromagnetic coil) 56th 1 permanent magnet (permanent magnet) 56N, 56S magnetic pole 57 second permanent magnet (permanent magnet) 57N, 57S magnetic pole 58A first magnetic conductor (magnetic conductor) 58B second magnetic conductor (magnetic conductor) 58C third Magnetic conductor (magnetic conductor)

Claims (2)

[Claims] 1. An electromagnetic reciprocating drive mechanism comprising a reciprocating member having a holding body for holding a permanent magnet, a laminated core provided close to the permanent magnet, and an electromagnetic coil for exciting the laminated core. The laminated core is formed by laminating thin pieces in which three or more protrusions are formed in parallel, and an independent electromagnetic coil is provided in a recess formed between these protrusions, and the permanent magnet is provided in a stationary state. An electromagnetic reciprocating drive mechanism, characterized in that the magnetic poles are arranged to face the recesses. 2. The electromagnetic reciprocating drive mechanism according to claim 1, wherein a magnetic conductor is provided in contact with said permanent magnet.