JPH0662787U - Cylindrical synchronous linear motor - Google Patents

Abstract

(57) [Summary] (Modified) [Object] The present invention relates to a cylindrical synchronous linear motor having a smooth armature winding. In particular, it has high rigidity and good cooling performance, so it is suitable for high thrust drive with frequent start / stop. [Structure] In a cylindrical synchronous linear motor in which a stator is composed of a cylindrical armature core and a cylindrical multiphase armature winding, and a mover is composed of a field magnetic pole composed of a cylindrical permanent magnet,
An armature core 1 in which a cooling pipe 11 provided on an axis and a cylindrical ferromagnetic material fitted to the outer diameter of the cooling pipe 11 are laminated.
3 and the cylindrical armature winding 14 in which the element coils for each phase (U, W, V) are spirally wound so as to have the pole pitch P, and the stator 1 is formed to have an axial length. A plurality of field magnetic poles 2a, 2b, 2c, each of which is a cylindrical permanent magnet that is slightly thinner than the pole pitch P and is divided into upper and lower parts and magnetized in the radial direction so that the facing parts have different polarities. .. and the field magnet 22 having a cylindrical cylindrical yoke 22 made of a ferromagnetic material having the field poles 2a, 2b, 2c ,. The mover 2 is movably arranged outside the stator 1 through a gap.

Description

[Detailed description of the device] [Industrial applications]

 The present invention relates to a cylindrical synchronous linear motor having a smooth armature winding.

[0001]

[Prior art]

 Conventionally, as an induction motor type cylindrical linear motor, a unit armature for each phase in which a toroidal coil is housed in an annular groove provided in a cylindrical yoke is arranged in the order of phases (U , V, W, U, V, W ...) are arranged in series, coils of the same phase are connected to form a stator, and a bar-shaped bar made of a good conductor is formed on the inner diameter side of the stator with a gap. There is one in which an inductor is arranged as a mover and multi-phase alternating current is supplied to each armature of the stator (for example, Japanese Utility Model Laid-Open No. 63-77474). A person skilled in the art can easily think that a synchronous motor can be obtained by replacing the inductor with a ring-shaped permanent magnet. Further, as a method of manufacturing an armature coil, there is a method in which element coils for each phase (U, V, W) are closely joined to each other to form a band coil (for example, Japanese Patent Laid-Open No. 62- 285645).

[0002]

[Problems to be solved by the device]

 However, while the former can achieve high rigidity, since the unit armatures for each phase are arranged in series in the traveling direction, the size in the longitudinal direction becomes large. Since it has a yoke, it has a large reactance and is not suitable for those that start and stop frequently. Moreover, since it is an induction motor, it was difficult to realize highly efficient and highly accurate feed. Furthermore, since there are heat sources on both the stator side and the mover side, cooling is difficult. Since the latter is intended for rotary motors, it cannot be applied to a cylindrical linear motor as it is. It is an object of the present invention to provide a compact cylindrical synchronous linear motor which is suitable for high frequency start / stop and has high rigidity and good cooling performance.

[0003]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention comprises a stator composed of a cylindrical armature core and a cylindrical multiphase armature winding, and a mover composed of a field magnetic pole composed of a cylindrical permanent magnet. In the cylindrical synchronous linear motor, the cooling pipe 11 provided on the shaft core, the armature core 13 laminated with the cylindrical ferromagnetic material fitted to the outer diameter of the cooling pipe 11 and each phase (U, V , W) element coils 14a, 14b, 14c form a stator 1 with a cylindrical armature winding 14 spirally wound so as to have a pole pitch P, and the axial length has a pole pitch P. A plurality of field magnetic poles 2a, 2b, 2c, consisting of a slightly thinner cylindrical permanent magnet divided vertically into two and magnetized in the radial direction so that those facing each other have different polarities. · And the field magnetic poles 2a, 2b, 2c, ··· Constituting the mover 2 in a field yoke 22. The mover 2 is movably arranged outside the stator 1 through a gap.

[0004]

[Action]

 When a three-phase AC current is supplied to the armature winding 14, an AC moving magnetic field generated by the armature winding 14 is generated in the axial direction, and thrust is generated by magnetic action with the magnetic flux generated by the field magnetic poles 2a, 2b, 2c. To occur.

[0005]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a cylindrical linear motor according to the present invention. FIG. 2 is a sectional view of a cylindrical linear motor according to the present invention. FIG. 3 is an explanatory view showing a manufacturing process of the smoothing armature coil used in the present invention. FIG. 4 is an explanatory view showing a method of manufacturing an armature winding used in the present invention. On the inner diameter side of a cylindrical armature core 13 laminated with a ferromagnetic material, a cooling pipe 11 having a coolant passage 12 inside is embedded. A cylindrical armature winding 14 is fitted on the outer diameter side of the armature core 13. The armature winding 14 electrically connects the element coils 14 a, 14 b, 14 c for each phase (U, W, V) shown in FIG. A band-shaped smoothing armature coil 15 (U, W ', V, U', W, V ') shown in FIG. 3 (b) is made (up to this point, Japanese Patent Laid-Open No. 62-285645). It is the same as the official gazette.) Further, as shown in FIG. 4, the smoothing armature coil 15 is joined to the sides 15e of each phase (U, W ', V, U', W, V '), and the pole pitch is arranged on the cylindrical winding core 100. After being spirally wound with P and molded, it is firmly fixed with resin or the like. On the armature winding 14 that has come out, stator magnetic poles having a one-pole pitch P of U, W ', and V in the axial direction are spirally formed. A cylindrical can 15 made of a non-magnetic material and thin is fitted to the outer diameter of the armature winding 14. The stator 1 is composed of a cooling pipe 11, an armature core 13, an armature winding 14 and a can 15, and both ends of the armature core 13 are fixed to supporting portions 16 and 16. The support portions 16 and 16 are provided with holes that penetrate the connection portions 11 a and 11 b provided at both ends of the cooling pipe 11. The refrigerant is supplied from the pipe (not shown) to the connecting portion 11a with pressure, flows through the cooling pipe 11, and is discharged from the connecting portion 11b to the pipe (not shown). The magnetic poles 2a, 2b, 2c, ... Are opposed to the outer diameter of the can 15 of the stator 1 via a gap. The field magnetic poles 2a, 2b, 2c, ... Have a length L in the axial direction slightly shorter than the pole pitch P of the armature winding 14 magnetized in the radial direction by dividing the cylindrical permanent magnet into upper and lower parts in the axial direction. As shown in FIG. 4, field magnets 2a, 2b, 2c, ... Composed of permanent magnets 21 facing each other so that their polarities are opposite to each other, The polarities of are alternated, and they are arranged in series in the axial direction at a homopolar pitch P. The field magnetic poles 2a, 2b, 2c, ... Are fixed to the inner diameter of the cylindrical field yoke 22 made of a ferromagnetic material. The field poles 2a, 2b, 2c, ... And the field yoke 22 constitute the mover 2. The mover 2 is movable by a supporting device (not shown).

The field magnetic flux Φ produced by the permanent magnet is in the path of the dotted line shown in FIG. 2 in the magnetic circuit constituted by the field yoke 22, the field magnetic poles 2 a, 2 b, 2 c, ... And the armature core 13. Flow through. When a balanced three-phase alternating current is supplied to the armature winding 14, each phase (U, W ', V, U', W, V ') within each pole pitch P in the direction indicated by the arrow in FIG. The current changes sinusoidally with a phase of 120 °, and the directions of U and U ', W and W'and V and V'are opposite. Therefore, the direction of the magnetic field generated by the armature winding 14 is reversed at the pole pitch P. When field poles 2a, 2b, 2c, ... With the upper and lower polarities reversed are inserted in this magnetic field, the lower half field pole and the upper half field pole receive armature reaction in the same direction and thrust Occurs.

[0007]

[Effect of device]

 The present invention has the following effects. 1. Since the armature winding is fitted into the highly rigid cylindrical armature core, the rigidity of the stator is high. 2. Since the field magnetic poles made of permanent magnets are arranged on the mover side, no loss occurs on the mover side, and the cooling tube cools the armature winding through the armature core, so that cooling is favorable. 3. Since the armature core, the field yoke, and the armature winding have a cylindrical shape, it is easy to obtain accuracy and processing is easy. 4. Since the stator magnetic poles are continuously formed without a core, it becomes compact.

[Brief description of drawings]

FIG. 1 is a perspective view of a cylindrical linear motor showing an embodiment of the present invention.

FIG. 2 is a sectional view of a cylindrical linear motor showing an embodiment of the present invention.

FIG. 3 is an explanatory view showing a manufacturing process of a smooth armature coil used in the present invention.

FIG. 4 is an explanatory view showing a method of manufacturing an armature winding used in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator 11 Cooling pipe 11a, 11b Connection part 12 Refrigerant passage 13 Armature core 14 Armature winding 14a, 14b, 14c Element coil 14e, 15e Side 15 Can 16, 16 Support part 2 Mover 2a, 2b, 2c, ..Field magnetic poles 21 Permanent magnets 22 Field yokes

Claims (2)

[Scope of utility model registration request] 1. A cylindrical synchronous linear motor in which a stator is composed of a cylindrical armature core and a cylindrical multiphase armature winding, and a mover is composed of a field magnetic pole composed of a cylindrical permanent magnet. , A cooling pipe (11) provided on both ends of the shaft core with connection portions for supplying a refrigerant, and an armature core () in which a cylindrical ferromagnetic material fitted to the outer diameter of the cooling pipe (11) is laminated ( 13),
Supporting portions (1) for fixing both ends of the armature core (13)
6, 16) and element coils for each phase (U, V, W) (14
a, 14b, 14c) comprises a stator (1) with a cylindrical armature winding (14) spirally wound so that the pole pitch P of the armature winding (14). A plurality of field magnetic poles (2a, 2b, 2c, ...) that are made by dividing a slightly thinner cylindrical permanent magnet into two in the vertical direction and magnetized in the radial direction so that the facing ones have different polarities. .) And the magnetic field poles (2a, 2b, 2c, ...) Are fixed to the mover (2) by a cylindrical cylindrical field yoke (22) in which the field magnetic poles (2a, 2b, 2c, ...) Are axially fixed in series at the pole pitch P. A cylindrical synchronous linear motor characterized in that the movable element (2) is movably arranged outside the stator (1) via a gap. 2. The cylindrical synchronous linear motor according to claim 1, wherein an outer diameter side of the armature winding (14) is covered with a non-magnetic can (15).