JPH01234040A - Linear motor - Google Patents

Abstract

PURPOSE:To prevent heat generation of a stator by providing a movable base, which can move in the perpendicular direction to the shifting direction of a runner, in a stator and energizing the movable base with a spring to abut on the runner at the time of non-excitation of the stator. CONSTITUTION:A secondary side conductor 12 is extended below a runner 11 which is guided by guides at both sides. U-shaped frames 17 are arranged at the essential parts along the guide rails 13. Coils 24 wound around plural slots of iron cores 23 are provided for movable bases 18 which are guided by guide pins 19 erected inside the frame 17. When the coils 24 are excited, the movable bases 18 are attracted toward the center while resisting springs 20, and brake shoes 16 and brake parts 25 are separated and thrust is given to the conductor 12 and the runner 11 runs along rails 13. When the coils 24 are changed over to non-excitation, the brake parts 25 are energized by springs 20 and contacts with brake shoes 16 to fix the runner 11. Hereby, braking current application of a stator 21 is made needless and temperature rise of the stator is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a near motor in which a running element including a secondary conductor moves according to the excitation state of a primary stator.

(Conventional technology) An example of this type of linear motor is shown in FIG.

That is, a strip-shaped secondary conductor 2 is fixed to the lower part of the running element 1, and rollers 4 guided by guide rails 3 are provided on both sides of the secondary conductor 2. In turn, the secondary conductor 2 is movable along the guide rail 3. - side, 5 is a U-shaped frame,
A primary stator 6 is fixed to each side wall 5a of the stator 6, which faces each other with the secondary conductor 2 interposed therebetween. When the primary stator 6 is excited, thrust magnetic flux is applied to the secondary conductor 2, thereby causing the running element 1 to move along the guide rail 3.

(Problem to be Solved by the Invention) In the linear motor having the above structure, there is a risk that the running element 1, which is stopped due to the non-excitation state of the primary side stator 6, may move inadvertently. In order to restrain the vessel 1 in a stopped state, it is necessary to maintain the primary stator 6 inside the ship in an energized state, thereby applying a restraining magnetic flux to the secondary conductor 2. For this reason, in the conventional structure described above, copper loss exceeding the allowable value occurs in the winding 6a of the primary stator 6 due to long-term energization, and as a result, there is a risk that the winding 6a may generate heat and burn out. . Also. There was also a risk that the secondary conductor 2 would also generate heat and become deformed.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a linear motor that can restrain a running element in a stopped state without causing problems such as heat generation in the primary stator.

[Structure of the Invention] (Means for Solving the Problems) The linear motor of the present invention includes a running element having a secondary conductor;
a movable base that is movable in a direction orthogonal to the moving direction of the running element, which carries a primary stator that applies magnetic flux for thrust to the secondary conductor in an energized state; excitation of the primary stator; biasing means for moving and biasing the movable base in a direction opposite to the direction of electromagnetic force acting on the movable base when the movable base is in the non-excited state of the primary stator; A brake portion is provided which abuts against the travel element and restricts its movement by applying a biasing force.

(Function) When the primary stator is in an excited state, electromagnetic force acts on it, so
The movable base is moving against the urging force of the urging means.

As a result, the brake part provided on the movable base is separated from the running element, so when thrust magnetic flux is applied from the primary stator to the secondary conductor in this state, the running element moves. do.

Now, when the primary stator becomes non-excited, the running element stops and the electromagnetic force acting on the primary stator disappears. Then, the movable base moves in a direction opposite to the direction of the electromagnetic force due to the urging force of the urging means. As a result, the brake section provided on the movable base comes into contact with the travel element and restricts its movement.

(Example) Hereinafter, a first example of the present invention will be described with reference to FIGS. 1 and 2.

Reference numeral 11 denotes a running element having a rectangular secondary conductor 12 at the bottom thereof, and rollers 14 guided by guide rails 13 are provided on both sides of the running element 11. 12 is movable along a guide rail 13. Furthermore, four parts 15 and 15 are formed at the bottom of the running element 11 so as to be located on both sides of the secondary conductor 12, and brake shoes 16 are provided on the side surfaces of each of the four parts 15.
is fixed.

Now, a U-shaped frame 17 is disposed at key points along the guide rail 13, and a pair of movable bases 18, 18 are movably provided on this frame. That is, each movable base 18 has guide pins 19 erected from the side wall 17a of the frame 17 inserted into these holes 18a, so that each movable base 18 can move in the direction along the guide pins 19, that is, in the direction along the traveler 1.
It is possible to move in a direction perpendicular to the first moving direction.

Here, the hole 18a of the movable base 18 is loosely inserted into the small diameter portion 19a of the guide pin 19, so that the movable base 18 can move within the range in which the small diameter portion 19a of the guide pin 19 is formed. There is.

Further, a compression coil spring 20 serving as a biasing means is interposed between the movable base 18 and the head of the guide pin 19.
This provides the movable base 18 with an elastic force that tends to move it toward the side wall 17a of the frame 17. 21.21 is a primary side stator fixed to the end face of each movable base 18, and as shown in FIG. The magnetic flux for thrust is applied to the secondary conductor 12 when each winding 24 is excited at a predetermined timing.

Reference numeral 25 denotes a brake part integrally formed on the upper part of the movable base 18, which faces the brake shoe 16 provided on the travel element 11. Therefore, when the primary stator 21 is in the non-excited state, the movable base 18 is connected to the compression coil spring 20.
The brake part 25 is moved toward the side wall 17a by the elastic force of the brake part 25, thereby bringing the brake part 25 into contact with the brake shoe 16.

Next, the operation of the above configuration will be explained.

When each winding 24 of the primary stator 21 is energized, these primary stators 21 become excited as shown in FIG. Electromagnetic force acts in the direction of attraction. Then, the primary stator 21 and, in turn, the movable base 18 move toward the secondary ring body 12 against the elastic force of the compression coil spring 20, and accordingly, the brake part 25 separates from the brake shoe 16 and moves to the second position. The positional relationship is shown in Figure 1. When a moving magnetic flux is generated along the guide rail 13 in response to the excitation of the winding 24, thrust magnetic flux is applied to the secondary side ring body 12, and this secondary side ring body 12
As a result, the running element 11 moves along the guide rail 13.

Now, when the primary stator 21 becomes non-excited, the running element 11 stops and the electromagnetic force acting on the primary stator 21 disappears. Then, the movable base 18 moves toward the side wall 17a by the elastic force of the compression coil spring 20, whereby the brake portion 25 comes into contact with the brake shoe 16 to restrict the movement of the running element 11. Therefore, the running element 11 does not move even when the primary stator 21 is not energized.

In short, according to the above configuration, the primary stator 21
In the non-excited state, the brake part 25 provided on the movable base 18 comes into contact with the brake shoe 16 of the travel element 11 and restricts the movement of the travel element 11, so that the energized state of the primary stator can be maintained. Unlike the conventional system in which the running element 11 is restrained in a stopped state, it is no longer necessary to keep the primary stator 21 energized to restrain the running element 11 in a stopped state. This prevents the secondary ring body 12 from being burnt out due to heat generation due to copper loss, and also prevents the secondary ring body 12 from being deformed due to heat generation.

FIG. 3 shows a second embodiment of the present invention, and the difference from the first embodiment is that a movable base 18 having a primary stator 21 is provided only on one side wall 26a side of the frame 26. At the same time, the primary stator 2 is mounted on the other side wall 26b.
1 is a directly fixed point. In the excited state of the primary stator 21, an electromagnetic force is applied to the primary stator 21 in the direction of the secondary ring body 12, so that as the movable base 18 moves as shown in the figure, brake part 25
is separated from the brake shoe 16, and the primary stator 21
In the non-excited state, the movable base 18 is compressed by the compression coil spring 20.
Due to the elastic force, the brake portion 25 moves toward the side wall 27a and comes into contact with the brake shoe 16. 'In this second embodiment, the primary stator 2
In the non-energized state of 1, the brake part 25 comes into contact with the brake shoe 16 and restricts the movement of the travel element 11. Therefore, as in the first embodiment, the primary stator 21 can travel without being kept energized. The child 11 can be restrained in a stopped state, and therefore the same effects as in the first embodiment can be achieved.

FIG. 4 shows a third embodiment of the present invention, in which the same parts as in the first embodiment are given the same reference numerals and explanations are omitted, and only the different parts will be explained. That is, 27 is a movable base, and the lower end of this in the figure is a support part 29 of a U-shaped frame 28.
This allows the movable base 27 to rotate around the support portion 29. Here, a guide pin 19 erected from a side wall 28a of the frame 28 is inserted into a hole 27a formed in the upper part of the movable base 27, and a guide pin 19 is inserted between the movable base 27 and the guide pin 19.
A compression coil spring 20 is interposed between the head part 9 and the head part 9. Therefore, the compression coil spring 20 exerts an elastic force on the movable base 27 to rotate it toward the side wall 28a.
It is given by Further, the primary side stator 21 is fixed to the end surface of the movable base 27, and a brake part 30 facing the brake shoe 16 of the travel element 11 is integrally provided on the upper part. As a result of this configuration, when the primary stators 21 and 21 are in an excited state, electromagnetic force acts between them in the direction of mutual attraction, so that the brake part 30 of the movable base 27 is activated as shown in the figure. When the running element 11 is separated from the brake shoe 16 and the primary stator 21 is in a non-excited state, the brake section 30 is separated from the brake shoe 16.
It is designed to come into contact with.

In this third embodiment, when the primary stator 21 becomes non-excited, the brake section of the movable base 27
Since the movement of the running element 11 is restricted by coming into contact with the brake shoe 16 on the first side, even if the running element 11 is restrained in a stopped state as in the first embodiment, the primary side stator 21 will not heat up and burn out. You won't end up doing it.

FIG. 5 shows a fourth embodiment of the present invention, in which the same parts as in the first embodiment are given the same reference numerals and explanations are omitted, and only the different parts will be explained. That is, the pair of movable bases 31.31 are movably supported by a guide pin 33 on the side wall 32a of the U-shaped frame 32, and are also supported in the direction toward the side of the secondary conductor work 2 by a compression coil spring 34 serving as a biasing means. The elastic force is given. Movable base 31
A primary stator 35.35 is fixed to the end face of
In this case, when each of the primary stators 35 is excited, electromagnetic forces act that repel each other. In addition, brake shoes 36 are provided on both upper sides of the secondary conductor 12.
．． 36, and a brake part 37 facing the brake shoe 36 is integrally provided on the upper part of the movable base 31. Therefore, in the excited state of the primary stator 35, an electromagnetic force is applied to move it toward the side wall 32a, so that the brake part 37 is separated from the brake shoe 36, and the primary stator 35 is moved away from the brake shoe 36. In the non-excited state, the movable base 31 moves toward the secondary conductor 12 due to the elastic force of the compression coil spring 34, so that the brake portion 37 comes into contact with the brake shoe 36.

In this fourth embodiment, when the primary stator 35 is not energized, the brake part 37 comes into contact with the brake shoe 36 and restricts the movement of the running element 11, so that the same effect as in the first embodiment can be obtained. can play.

Note that the present invention is not limited to the above embodiments, and may be applied to a linear motor having a primary stator only on one side of the secondary conductor, for example, without departing from the gist thereof. It is possible to make various changes within the range.

[Effects of the Invention] As is clear from the above description, according to the linear motor of the present invention, a movable running element having a secondary conductor and a thrust force applied to the secondary conductor in an excited state are provided. a movable base that has a primary stator that provides magnetic flux and is movable in a direction perpendicular to the direction of movement of the running element; and an electromagnetic vertical force that acts on the primary stator when it is excited. a biasing means for biasing the movable base to move in a direction opposite to that of the movable base, and a biasing force of the biasing means provided on the movable base in a non-excited state of the primary stator; After providing a brake part that abuts and restricts movement of the brake part,
This has an excellent effect in that the primary stator does not generate heat or other problems (and the running element can be restrained in a stopped state).

[Brief explanation of the drawing]

1 and 2 show a first embodiment of the present invention, FIG. 1 is a longitudinal sectional view of the whole, and FIG. 2 is a plan view showing the magnetized state of the primary stator. . Further, FIG. 3 is a view corresponding to FIG. 1 showing a second embodiment of the present invention, and FIG. 4 is a longitudinal cross-sectional view of main parts showing a third embodiment of the present invention.
FIG. 5 is a diagram corresponding to FIG. 1 showing a fourth embodiment of the present invention. , and FIG. 6 is a diagram corresponding to FIG. 1 showing a conventional example. In the figure, 11 is a running element, 12 is a secondary conductor, 18 is a movable base, 2o is a compression coil spring (biasing means), 21 is a primary stator, 25 is a brake part, 27 is a movable base, 30
31 is a movable base, 33 is a compression coil spring (biasing means), 35 is a primary stator, and 37 is a brake portion. Applicant Toshiba Corporation Figure 1 Figure 8 Figure 4

Claims (1)

[Claims] 1. A running element having a secondary conductor, and a primary stator that provides thrust magnetic flux to the secondary conductor in an excited state, and is movable in a direction perpendicular to the direction of movement of the running element. a movable base, a biasing means for biasing the movable base to move in a direction opposite to the direction of electromagnetic force acting on the primary stator in an excited state; 1. A linear motor comprising: a brake section which abuts against the running element and restricts movement thereof by the urging force of the urging means when the next stator is not energized.