KR20020066603A - Linear motor - Google Patents

Abstract

PURPOSE: A linear motor structure is provided to achieve an improved efficiency of linear motor by reducing the gap formed between the outer core and inner core, while reducing manufacturing cost by forming the magnet integrally with the inner core. CONSTITUTION: A linear motor structure comprises a motor coil(12) taken up at a cylindrical coil insulating member(12a); an outer coil(11) radially arranged along the outer periphery of the coil insulating member, and which has upper and lower magnetic pole sections; an inner core(14) radially arranged along the outer periphery of a core frame(13b), with a gap formed between the outer core and the inner core; and magnets(15) arranged in a circumferential direction at the aperture portion formed at the inner core. The inner core has, at an outer periphery thereof, an aperture portion(14a), and the magnets are arranged in a circumferential direction in the aperture portion, to thereby integrating the inner core and the magnets into a cylindrical shape.

Description

Linear Motor Structure {LINEAR MOTOR}

The present invention relates to a structure of a linear motor reciprocating linearly, the structure of the linear motor of the present invention provides a support jaw and a fixed jaw on the circumferential surface of the mover frame formed in a cylindrical shape, the inner core of the support portion and the fixed portion thereof Fixing grooves provided on both end surfaces of the inner core are seated and fixed, and a predetermined magnet is arranged in a cylindrical shape in the magnet insertion groove of the inner core, and the circumferential surface thereof is fixed by a cylindrical magnet frame so that the inner core and the magnet are firmly integrated. Or a variant of the linear motor which is integrally fixed by insert molding surrounding the inner core and the magnet with a plastic member such as polycarbonate (PC).

In general, a mover configured by combining a magnet and a frame is provided with a gap having a predetermined width between the inner core and the outer core, and is linearly reciprocated by an induction magnet generated from these two cores. At this time, the frame and the magnet constituting the mover can be firmly coupled without being separated, it is possible to improve the reliability of the linear motor.

In the conventional linear motor, as shown in FIG. 1A, a predetermined space is provided at the center of the outer core 1 having a cylindrical shape and radially installed, and the inner side of the upper core 1a and the lower core 1b thereof. The magnetic pole part 1c which generate | occur | produces an induction magnet is provided in the edge part, and the motor coil 2 is wound in the predetermined space provided in the inner side of the said outer core.

In addition, the inner core 4 is provided on the circumference of the cylindrical cylinder 8 so as to form a void having a predetermined width on the inner surface of the outer core 1 and become radially cylindrical, and the outer core 1 And a magnet (5) formed so as to apply and apply an adhesive to each of the magnet coupling grooves (3a) provided at predetermined portions in the circumferential direction on the outer circumferential surface of the frame (3) in the gap provided between the inner core (4). The mover 10 is installed, and one side of the piston 7 is fixed to one side of the frame 3, and when the mover 10 performs a linear reciprocating operation, the piston 7 follows the linear reciprocation. It is structure to exercise.

However, in the conventional linear motor structure as described above, since the mover 10 linearly reciprocates between the outer core 1 and the inner core 4, excessive voids are provided, resulting in a decrease in efficiency of the linear motor. By fixing the inner core 4 on the circumference of the cylinder 8 required, an excessive force is applied to the cylinder 8, thereby causing a problem in reliability.

In addition, the mover 10 structure for fixing the magnet 5 using an adhesive takes a long time until the adhesive is applied and dried, and the magnet 5 is removed from the frame 3 by vibration generated during long time operation. There was a problem that breaks out.

The present invention is to solve the conventional problems as described above, an object of the present invention is to reduce the electrical loss of the motor by minimizing the gap between the inner core and the outer core to improve the efficiency of the linear motor, the mover formed in a cylindrical The inner core and the magnet are fixed to the outer circumferential surface of the core frame coupled to the frame in a radially cylindrical shape, and the inner core and the magnet are firmly fixed to the magnet frame, or in another variation, the inner core and the magnet are fixed. The insert molding is wrapped in a plastic member such as polycarbonate (PC) to improve the reliability of the mover, while providing a structure of a linear motor that improves productivity by integrating its magnet and the inner core.

1 is a cross-sectional view showing the structure of a conventional linear motor.

2 is a cross-sectional view showing the structure of a linear motor according to the present invention.

Figure 3a is a cross-sectional view showing a mover structure according to the present invention.

Figure 3b is a longitudinal sectional view showing a mover structure according to the present invention.

4A is a cross-sectional view showing a modification of the mover structure according to the present invention.

4B is a longitudinal sectional view showing a modification of the mover structure according to the present invention;

5 is a cross-sectional view showing the structure of a linear motor according to another embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

11 ... outer core 11a ... upper core

11b ... lower core 12 ... motor coil

12a ... coil insulation material 13 ... operator frame

13b Core frame 14 Inner core

15 ... magnet 16 ... magnet frame

20.Operator

The present invention for achieving the above object is formed of an upper core and a lower core having a magnetic pole portion at one side end, the outer core having an opening having a predetermined space between the upper core and the lower core, and the outer side A motor coil wound around the opening of the core, a mover frame provided inside the outer core and having a cylindrical end portion, a core frame provided with a fixed portion at an end fixed to the mover frame and formed in a cylindrical shape; An inner core fixed to the mover frame and the core frame and having an opening having a predetermined width at an outer center thereof, a predetermined magnet formed in an arc and circumferentially seated on the circumferential surface of the opening of the inner core; The mover is configured so that the core and the magnet are integrated into the magnet frame. The structure of the linear motor.

Hereinafter, one preferred embodiment according to the present invention will be described in more detail with reference to the accompanying drawings.

Figure 2 is a cross-sectional view showing the entire structure of the linear motor according to the present invention, Figures 3a and 3b is a cross-sectional view showing a mover structure of the linear motor fixed to the magnet and the inner core, and a cross-sectional view showing a longitudinal section thereof, Figure 4a 4B is a cross-sectional view showing a modified example of the movable coupling structure according to the present invention and a longitudinal cross section thereof. 5 is a cross-sectional view showing the structure of a linear motor according to another embodiment of the present invention.

As shown in FIG. 2, the linear motor of the present invention has a cylindrical inner frame 13 and core frame 13b provided with a support 13a and a fixing portion 13c on a circumference. 14 is fixed radially cylindrical, the magnet 15 is arranged in a cylindrical shape in the opening (14a) provided in the center of the inner core 14 thereof, the outer peripheral surface of the inner of the cylindrical magnet frame (16) The core 14 and the magnet 15 are fixed to be integrally formed. The cylindrical frame-shaped mover frame 13 is provided with a stepped portion 13d at a predetermined depth at an end thereof, and has a predetermined angle and width at its outer peripheral surface. The supporting portion 13a is formed on the circumference to fix one end surface of the fixing groove 14b provided on both sides of the inner core 14, and brazing or welding the step portion 13d provided on the mover frame 13. Combined in the same way as The core frame 13b is formed in a cylindrical shape, and an inner core having a fixed width 13c having a predetermined width at one end thereof is formed on a circumference, and fixedly fixed to the support 13a of the movable frame 13. The fixing groove 14b provided on one side of the opposite side of the 14 is firmly fixed.

The inner core 14 fixed radially cylindrical to the outer circumferential surface of the core frame 13b is coupled to the supporting portion 13a of the mover frame 13 and the fixing portion 13c of the core frame 13b at both ends. The fixing groove 14b having a predetermined depth is formed to be formed, and an opening 14a having a predetermined width and depth is formed at the center of one side thereof, and the predetermined magnet 15 formed to form the arc has its opening 14a. It is seated on). In addition, the length Li of the inner core 14 is longer than the length Lo of the outer core 11 to minimize the electrical loss generated when the inner core 14 reciprocates.

The magnet 15 formed by forming an arc has the same size as the size of the arc of the opening 14a provided in the center of the inner core 14 having the circular arc size of the inner circumferential surface cylindrically fixed to the core frame 13b. The inner circumferential surface of the c) is tightly fixed to the outer circumferential surface of the opening 14a provided in the inner core 14.

The cylindrical magnet frame 16 is coupled in close contact with the outer circumferential surface of the magnet 15 to prevent the magnet 15 seated in the opening 14a of the inner core 14 from being separated from the opening 14a. Both ends thereof are bent in the cylinder inward direction to firmly fix the inner core 14 and the magnet 15 to be integrated.

The metal member used for the mover frame 13 and the magnet frame 16 may be used in a variety of metal materials having the same mechanical properties as those of non-magnetic stainless steel (STS) or aluminum (Al), and plastic Alternatively, the inner core 14 and the magnet 15 may be fixed by molding the movable frame 13 and the core frame 13b into a single body using a material such as aluminum.

4A and 4B, in another modification of fixing the inner core 314 and the magnet 315, the magnet 315 formed in an arc has a stepped shape having slopes at both ends thereof in the circumferential direction thereof. When the fixing jaw 315a is provided, and the magnet 315 is coupled to the inner core 314, a triangular groove is formed at a portion of each magnet 315 adjacent thereto, and the magnet 315 is firmly formed in the groove thereof. While fixing the frame holder 313a, the inner core 314 and the magnet 315 are wrapped, and the mold 300 is molded into a plastic member such as polycarbonate (PC) so that the frame 313 is molded. It is only to form the basic idea is the same as described above.

The outer core 11 formed by being divided into the upper core 11a and the lower core 11b has an opening 11d having a predetermined space formed between the upper core 11a and the lower core 11b. The magnetic pole part 11c is provided in each one end part of the core 11a and the lower core 11b. In addition, the inner core 14 is disposed to be radially cylindrical with an air gap having a predetermined distance therebetween, and is formed inside the opening 11d provided between the upper core 11a and the lower core 11b. A cylindrical coil insulator 12a is provided, and the motor coil 12 is wound around the coil insulator 12a.

The following describes the operation of the linear motor according to the present invention configured as described above.

First, when the linear motor is in a stationary state, as shown in FIG. 2, the magnet 20 and the outer core 11 having the magnet 15 fixed to the opening 14a of the inner core 14 are fixed. With a space having a predetermined distance from the inner circumferential surface, the position of the magnet 15 provided in a cylindrical shape in the opening 14a of the inner core 14 is located at the center of the length Lo of the outer core 11. do.

When a current flows in the motor coil 12 wound around the opening 11d of the outer core 11, an induced current flows into the inner core 14 through the magnetic pole part 11c provided in the outer core 11. The actuator 20 is configured to be integrally formed with the inner core 14 and the magnet 15 to linearly reciprocate in the axial direction.

As described above, the technical idea of the linear motor according to the present invention is not limited to the above description, and as shown in FIG. 5, the structure of the linear motor according to another embodiment of the present invention is as follows.

In the above-described embodiment of the present invention, the outer core 11 in which the motor coil 12 is wound is installed in the opening 11d between the upper core 11a and the lower core 11b, and is mounted on the mover frame 13. The inner core 14 is radially installed on the outer circumferential surface of the provided core frame 13b, and the mover 20 is configured such that the inner core 14 and the magnet 15 are integrally formed with the magnet frame 16. In another embodiment of the present invention, as shown in FIG. 5, the magnetic pole part 110c is provided at the upper and lower portions, and the opening 110a has a predetermined depth between the magnetic pole parts 110c. The outer core 110 provided with) is seated and fixed to the cylindrical coil insulation material 120a on which the motor coil 120 is wound, and has a predetermined angle and width to the cylindrical mover frame 130 and the core frame 130b. The support portion 130a and the fixing portion 130c each having a circumference are formed on the circumference, and the support The inner core 140 is assembled to be radially cylindrical between the portion 130a and the fixing portion 130c. At this time, the inner core 140 is an opening in which the magnet 150 is assembled to minimize the gap between the outer core 110 and the inner core 140 and to minimize the electrical resistance of the inner core 140 through which an induced current flows. By separating a plurality of 140a, a predetermined magnet 150 is installed in the opening 140a to have a cylindrical shape, and the inner core 140 and the magnet 150 are fixed to the magnet frame 160 to be integrated. To provide a linear motor configured with the mover 200.

In addition, the magnet 150 is provided with a stair-shaped fixing jaw 315a as in the modification of the present invention described above, and the inner core 140 and the magnet while forming a mover frame (not shown) using a plastic material. It is also possible to improve productivity by insert molding 150 to form a mover (not shown) of the same coupling structure as the mover 300 of the other variant.

As described above, the length Li of the inner core 140 is longer than the length Lo of the outer core 110, and the position of the opening 140a on which the magnet 150 is seated is located on the outer core. It is provided to contact the magnetic pole portion 110c and the motor coil 120 of 110 to minimize the electrical loss generated by the inner core 140 reciprocating.

As described above, the linear motor according to the present invention radially arranges an inner core provided with an opening on the outer circumferential surface of the core frame provided in the mover frame, and arranges a predetermined magnet in a cylindrical shape in the opening provided in the inner core. The gap between the outer core and the inner core is formed by forming a mover by seating and forming the mover so that the outer circumferential surface of the magnet is integrated with the inner core with the magnet frame, or by insert molding the inner core and the magnet with a plastic member. The efficiency of the linear motor can be improved, and the integration of the magnet and the inner core not only reduces the manufacturing cost of the linear motor but also improves the productivity.

In addition, in another embodiment of the present invention, in order to minimize the electrical resistance of the inner core, a plurality of openings are provided in the inner core, and a predetermined magnet is installed in each of the openings to have a cylindrical shape, and the inner core and the magnet By constituting the mover integrally, the efficiency of the linear motor can be improved.

Claims (3)

A motor coil wound around a cylindrical coil insulation material, an outer core radially provided on an outer circumferential surface of the coil insulation material, each having a magnetic pole portion at an upper side and a lower side thereof, and an air gap having a predetermined width with the outer core. In a linear motor structure comprising an inner core radially arranged on an outer circumferential surface and a predetermined magnet circumferentially seated in an opening formed in the inner core, an opening is provided on an outer circumferential surface of the inner core and provided at an opening thereof. A linear motor structure, characterized in that a predetermined magnet is arranged in the circumferential direction and the inner core and the magnet are formed in a cylindrical shape. The linear motor structure, characterized in that the inner core and the magnet is integrally wrapped with a plastic member and the insert is molded to form a frame to form a mover. And a plurality of openings formed in the inner core, and a predetermined magnet is installed in each of the openings so that the inner core and the magnet are formed in a cylindrical shape.