JPH059183U - Synchronous linear motor - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to provide a linear motor that is compact, has a small torque ripple, is highly efficient, and is inexpensive, has extremely high cost performance, and is flexible enough to be easily made into a series. It will be possible. [Structure] In a magnetic flux penetration type synchronous linear motor in which a stator is sandwiched by movers (moving magnet type) from both sides, the stator has a U-shaped coil of each phase on both sides of a flat plate made of a ferromagnetic material. , The reverse W and V, the electrical phase angle is shifted by 120 °, and a smooth strip coil wound at a predetermined pole pitch is attached to form an armature, and the mover is formed on both inner surfaces of a U-shaped ferromagnetic body. Synchronous linear motor is constructed by sandwiching a plurality of mover units in which permanent magnets are arranged at the same pole pitch as that of the stator so that the polarities are different from each other in the traveling direction through gaps from both sides of the stator. To do.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention is a moving magnet type magnetic flux used in ultra-precision drive devices. The present invention relates to a through-type synchronous linear motor.

[0002]

[Prior art]

  A conventional magnetic flux penetrating type three-phase synchronous linear motor is disclosed in, for example, Japanese Patent Laid-Open No. 63-21796. As disclosed in Japanese Unexamined Patent Publication No. 5 (1999), an armature of a stator is replaced with a mover (moving magnet). The magnetic flux passing through the stator is in the same direction as the traveling direction. The structure is the same.   The stator armature coil has each phase coil oriented in the direction of travel within the core slot. U, reverse W, and V are wound at a predetermined pole pitch in this order.   On the other hand, the mover is arranged on the magnetic plate so that the magnetizing directions alternate with a predetermined magnetic pole pitch. A magnet is arranged.   When the armature coil is excited by alternating current, the magnetic flux becomes a gap-adjacent field magnet-armature Pass the magnetic pole-opposing field magnet-gap and generate thrust by armature reaction .

[0003]

[Problems to be Solved by the Invention]

  However, the conventional technology has the following problems. So the present invention , Aims to solve these problems. 1) The magnetic field generated by the stator causes a strong magnetic attraction force on the mover, causing the mover to bend. The gap changes. 2) Leakage magnetic flux across the armature poles may increase, which is the motor constant. Has become a factor that lowers. 3) The field pole pitch is twice as large as the coil pole pitch, making it a device series For example, when changing the mover size according to the motor thrust, the number of phases and pole pitch should be 2 If you try to get the thrust in the middle, the need for new design and production This is a factor that increases the manufacturing cost.

[0004]

[Means for Solving Problems]

  In order to solve the above-mentioned problems, the movable element (moving element) For a magnetic flux penetration type three-phase synchronous linear motor that is sandwiched between Then, on both sides of the gap side of the flat plate made of a non-magnetic material, U and reverse W in the traveling direction. , V in the order of a predetermined coil pitch, and spirally bend this for each pole pitch Aligned or overwound smooth strip-shaped coil is attached as an armature. At the same pole pitch as that of the stator, on both the inner surface of the stator and the U-shaped ferromagnetic body. , A mover unit in which permanent magnets are arranged so that their polarities are different from each other in the traveling direction. A plurality of synchronous linear models are inserted so that they are sandwiched from both sides of the stator with a gap. Configure the data.

[0005]

[Action]

  In each field pole, magnetic flux flows in the direction orthogonal to the moving direction of the mover, and the cap-permanent magnet. -Movable core-Permanent magnet-Passes through the cap and returns to the armature coil, Action on the mover unit by acting with the moving magnetic field generated by flowing three-phase alternating current Generate force.

[0006]

【Example】

  Hereinafter, a specific embodiment of the present invention will be described with reference to FIG. 1, FIG. 2 and FIG. 3 will be described.   The fixed base 1 made of a non-magnetic material has a stator core 2 made of an inverted T-shaped non-magnetic material. The bottom is fixed. On the other hand, on both sides of the I-shaped part, as shown in FIG. The coil is wound in the order of U, reverse W and V at a predetermined coil pitch τ in the traveling direction, Smooth strip-shaped coils 3a and 3b (for example, The element coil disclosed in Kaisho 60-216746) is attached to a plane object to form an armature. Make up Sadako.   The strip coils 3a and 3b, which are armature coils, have a vector of the current flowing in each phase and , Are wound so that the field magnetic flux vectors created by the permanent magnets 5 are orthogonal to each other, and face each other. The currents flowing through the corrugated coils 3a and 3b are connected in the same direction. this When a balanced three-phase current is applied to the strip coils 3a and 3b from the motor terminals, it moves in the traveling direction. A moving magnetic field is generated.   As shown in FIG. 3, the permanent magnets are inserted through the gaps 4 and both sides of the strip coils 3a and 3b. Magnets that face the stones 5a and 5b on both inner surfaces of the U-shaped ferromagnetic mover core 6 Are attached so that the polarities of them are different from each other, and the units 7a, 7b, 7c, 7 of the mover 7 are Configure d.   .., 7d of the mover 7 in the same direction as the number of poles of the motor in the traveling direction. With the same number of knits as the magnetic pole pitch τ of the strip coils 3a and 3b, Make sure that the adjacent poles have different polarities and sandwich the stator through the gap. To arrange.   At this time, the flow of magnetic flux is orthogonal to the traveling direction, as shown by the dotted line in FIG. It

[0007]   In addition, as an application example of the present invention, the number of units of the mover 7 is an odd number such as 3, 5, or 7. Make up a mover with several pieces, or thin out every other mover unit. Good.   FIG. 4 shows another embodiment relating to the support of the mover 7.   The tip of the inverted T-shaped stator core 2 and the bottom of the stator core 2 have a fluid duct in the traveling direction of the mover 7. Provided with a plurality of fluid discharge ports 9 in a direction orthogonal to the fluid ducts 8, 8. And a fluid bearing 10 is formed by discharging fluid to the plane provided on the mover 7. 7 is supported by a fluid bearing.   FIG. 5 shows another embodiment relating to the support of the mover 7.   The tip end and the base of the inverted T-shaped stator core 2 are continuous in the traveling direction of the mover 7. The groove 11 is provided, and the ball 12 is fitted into the groove 11 so as to be rollable, and the hole 12 can be moved. The pressurizing spring 13 housed in a plurality of holes 14 provided at positions facing the groove 11 of the child 7. Supports the mover 7 by pressing in the direction of the groove 11 to form a linear ball guide. To do.   6 and 7 show another embodiment of cooling the stator.   A mover 7 fixed with permanent magnets 5a and 5b facing the inner surface of a box-shaped mover core 6. Is supported on the upper surface of the fixed base 1 by a linear guide 15. It's an H-shaped non-magnetic material The stator core 2 is composed of brackets 16 and 16 supported at both ends in the longitudinal direction. , The strip-shaped coils 3a and 3b attached to the upper and lower recesses of the stator core 2 are the permanent magnets 5a. 5b are opposed to each other with a gap. Longitudinal cooling on both sides of the stator core 2 The pipe 17 is embedded, and the pipe 17 is opened to the outside of the bracket 16. It is connected to a water device and supplies cooling liquid to cool the armature windings via the stator core. I have it.   Therefore, the cooling effect of the armature winding consisting of strip coils and the entire device is improved. Can be made.   In addition, instead of the cooling pipe 17, the heat absorption part of the heat pipe is embedded in the stator core 2. Alternatively, a cooling fin may be provided on the heat radiation portion to cool the heat radiation portion.

[0008]

【The invention's effect】

  As described above, the present invention has the following effects. 1) Since the stator core is made of non-magnetic material, the magnetic attraction force is greatly reduced and the stator core is movable. The flexure of the child is also greatly reduced, the gap variation is small, and precise movement is possible. 2) Since the flow of magnetic flux is made orthogonal to the traveling direction for each unit of the mover, leakage flux Can be reduced. 3) The number of mover units may be even or odd. What was previously available can be made into a series by supporting various thrusts by selecting the number of units Becomes 4) Pass cooling liquid through the stator core or cool it with a heat pipe. Therefore, the temperature of the armature winding and the entire device is made uniform, and the position due to thermal expansion is adjusted. It is possible to prevent the determination accuracy from decreasing.   Therefore, it is said that it is small, has small torque ripple, is highly efficient, and is inexpensive. The cost performance is extremely high, and you can easily make a series from one design. It is possible to provide a linear motor that has the flexibility to operate.

[Brief description of drawings]

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

FIG. 2 is a plan view of a strip coil showing an embodiment of the present invention.

FIG. 3 is a sectional view of a magnetic circuit showing an embodiment of the present invention.

FIG. 4 is a sectional view showing another embodiment of the present invention.

FIG. 5 is a sectional view showing another embodiment of the present invention.

FIG. 6 is a cross-sectional view taken along the cross-section of FIG. 7 showing another embodiment of the present invention.

FIG. 7 is a cross-sectional view taken along the cross-section of FIG. 6 showing another embodiment of the present invention.

[Explanation of symbols]

1 Fixed Stand 2 Stator Core 3 Strip Coil 4 Gap 5, 5a, 5b Permanent Magnet 6 Mover Core 7 Mover 7a, 7b, 7b, 7d
Movable unit 8 Fluid duct 9 Fluid discharge port 10 Fluid bearing 11 Groove 12 Ball 13 Spring 14 Hole 15 Linear guide 16 Bracket 17 Cooling pipe

Claims (5)

[Scope of utility model registration request] 1. A magnetic flux penetrating synchronous linear motor in which a stator is sandwiched from both sides of a stator by a flux penetrating type synchronous linear motor, and element coils U, The stator is formed by attaching a smooth strip-shaped coil wound in a predetermined pole pitch in a reverse W and V order to each other as an armature, and the stator on both inner surfaces of a U-shaped ferromagnetic body. The same linear pitch as that of No. 1, but a plurality of mover units in which permanent magnets are arranged so that the polarities are different from each other in the traveling direction are sandwiched from both sides of the stator through a gap. motor. 2. The synchronous linear motor according to claim 1, wherein the mover units are arranged at every one magnetic pole pitch so that the magnetizing directions on one side are aligned. 3. The synchronous linear motor according to claim 1, wherein an odd number of the mover units are arranged in the traveling direction. 4. The synchronous linear motor according to any one of claims 1 to 3, wherein the stator is provided with a cooling liquid flow passage extending in a traveling direction of the mover. 5. The heat absorbing part of a heat pipe extending in the traveling direction of the mover is embedded in the stator.
The synchronous linear motor according to any one of items 1 to 7.