JPH0522923A - Armature winding of linear motor - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the reactive power when the armature winding is energized and reduce the burden on the power supply and transmission path. [Arrangement] The armature winding 3 is a full-pitch winding and a two-layer winding consisting of an upper layer winding 3a and a lower layer winding 3b. Currents in the same phase and in the same direction flow in the upper and lower windings, and between the both windings. Since a suction force acts on the groove 10, a thin non-metal cover 11 may be provided on the upper portion of the groove 10. Therefore, the height of the groove 10 can be reduced, and the reactive power due to the leakage magnetic flux at the groove head can be reduced. This burden can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an armature winding of a linear motor which continuously excites the entire length of an armature while a thrust is being applied to a runner.

[0002]

2. Description of the Related Art In a car production plant or the like, an automatic carrying device for carrying or handling parts is used. The automatic carrier is a mover configured so as to be able to travel, which includes a stator provided with an armature core and an armature winding that are linearly expanded along a line for carrying components, and a moving side core that faces the stator. Equipped with a linear motor (linear synchronous motor or linear induction motor), which conveys parts. Further, the moving element is provided with an arm, the arm is moved up and down by a servomotor, and a hand is provided at the tip of the arm to operate the hand with compressed air to handle parts.

The armature winding of a linear motor employs a two-layer lap winding in which two coils are inserted in a groove in a stacked manner. FIG. 3 is a vertical sectional view of a conventional linear motor. The linear motor includes an armature core 2 fixed to a loader rail 1.
And a stator 4 composed of an armature winding 3 and a loader rail 1
And a movable element 7 to which movable iron cores 8 facing the armature windings 3 are attached, the movable elements 7 being movably supported by rails 6 fixed to both sides of the movable element 6 via wheels 9. 5 is armature winding 3
Is a resin that fixes the. There is a certain gap between the stator 4 and the mover 7. When a two-phase or three-phase alternating current is passed through the armature winding 3, a traveling magnetic field is generated. In the case of a linear synchronous motor, the moving element 7 is moved by the electromagnetic force between the traveling magnetic field by the armature winding 3 and the moving side iron core 8 which is a permanent magnet attached to the moving element. In the case of a linear induction motor, the magnetic flux generated from the armature winding 3 generates an eddy current in the moving side iron core 8 of the traveling element 7, and
Run.

Conventionally, in the case of an automatic transfer apparatus using a one-sided linear induction motor, a large number of unit-sized stators are arranged at intervals and electric power is supplied to the armature winding only when traveling on a pallet. Therefore, the excitation loss of the armature winding was not considered.

[0005]

In the linear motor having the armature winding on the fixed side, in addition to the effective power consumption for applying the thrust to the mover, the groove leakage is mainly caused to energize the entire length of the armature. There is reactive power due to magnetic flux, and as the armature length increases, it reaches a non-negligible amount, placing a burden on the power supply.

The reactive power in the armature winding is mainly due to the leakage magnetic flux generated in the armature groove and the winding end portion. Therefore, it is desirable to reduce these leakage magnetic fluxes. As a means for reducing the leakage magnetic flux in the groove of the armature winding, there is a method of reducing the height of the groove. The winding housing portion of the groove is restricted by a predetermined conductor volume and insulation thickness, and a significant reduction in height cannot be expected. Therefore, in order to reduce the height of the groove, it is necessary to reduce the thickness of the wedge that fixes the winding. In a normal armature winding configuration, the upper layer winding and the lower layer winding have opposite current directions, and repulsive force acts between the upper and lower layer armature windings.
In order to suppress this, it is difficult to reduce the thickness of the wedge because the wedge is required to have a certain strength.

An object of the present invention is to provide an armature winding for a linear motor that reduces reactive power when the armature winding is energized and reduces the burden on the power source and the transmission path.

[0008]

In a linear motor comprising a stator having a linearly expanded armature core and an armature winding, and a mover configured to run, the armature winding is provided. The above-mentioned object is achieved by making the wire full-pitch winding and two-layer winding.

[0009]

According to the present invention, since the armature winding of the linear motor is full-pitch winding and double-layer winding, the currents flowing through the upper-layer winding and the lower-layer winding housed in the groove of the armature core have the same phase,
Since it is in the same direction and an attractive force acts between both windings, a simple cover made of non-metal such as rubber is provided as a wedge that suppresses the upper part of the groove, or the wedge is omitted and the height of the groove is reduced. Can be made As a result, it is possible to reduce the reactive power due to the leakage magnetic flux of the armature winding at the groove head.

[0010]

1 is a longitudinal sectional view of a stator of a linear motor according to an embodiment of the present invention. A groove 10 is provided in the armature core 2 that is linearly expanded. FIG. 1 shows the case of full-pitch winding with one groove for each pole and phase. In the groove 10, the upper layer winding 3a
The armature winding 3 consisting of two layers of the lower winding 3b and the lower winding 3b is inserted. The upper layer winding 3a and the lower layer winding 3b are windings of the same phase, current flows in the upper and lower windings in the same direction, and an attractive force is generated between the upper layer winding 3a and the lower layer winding 3b. To work. An attraction force acts between the armature winding 3 and the armature core 2 by a mirror image effect. Therefore, the armature winding 3 is stably fixed in the groove 10.

FIG. 2 is a partially enlarged sectional view of the armature shown in FIG. 2, the same parts as those in FIG. 1 are designated by the same reference numerals. Currents of the same phase in the same direction flow between the upper layer winding 3a and the lower layer winding 3b, and the upper and lower windings attract each other.
A wedge for fixing the armature winding 3 is not required above the groove 10, and a thin non-metal cover 11 may be provided in the gap between the openings of the groove 10 for the convenience of winding storage work. .. As a result, it is possible to reduce or eliminate the reactive power caused by the leakage magnetic flux at the groove head of the armature winding.

[0012]

According to the present invention, the armature winding of the linear motor is a full-pitch winding and a two-layer winding, and an attractive force acts between the upper layer winding and the lower layer winding. Since a simple non-metal cover may be provided in the gap between the portions, the thickness of the wedge above the groove can be reduced as compared with the conventional case. Or
Since the conventional wedge can be omitted, the reactive power resulting from the magnetic flux leaking from the groove head can be reduced, and the load on the power source of the linear motor can be reduced.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a stator of a linear motor according to an embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view of the armature shown in FIG.

FIG. 3 is a vertical sectional view of a conventional linear motor.

[Explanation of symbols]

 2 armature core 3 armature winding 3a upper layer winding 3b lower layer winding 4 stator 7 mover 10 groove 11 non-metal cover

Claims (1)

Claim: What is claimed is: 1. A linear motor comprising: a stator having a linearly expanded armature core and an armature winding; An armature winding for a linear motor, characterized in that the child winding is full-pitch winding and two-layer winding.