JPH029699B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a one-sided system that measures thrust and vertical force on the ground side when stationary and when traveling through a plurality of storage boxes each having a steel ball containing a linear motor ground element and a load sensor. This invention relates to a device for measuring the thrust and vertical force of an induction linear motor.

Conventionally, there is no particularly effective and appropriate method for measuring the thrust of a single-side induction type linear motor, and for convenience, a running wheel is used in which a predetermined gap is maintained above the linear motor ground element (primary or secondary of the linear motor). Running body with attached (secondary or primary of linear motor)
is connected to a spring balancer at one end of the traveling body in the opposite direction of travel, making it stationary, and utilizing the elongation of the spring as the traveling body moves due to the generation of thrust. According to this method, the measurable thrust is the same as when the vehicle is restrained. This value lacked accuracy, and it also had the disadvantage that it was not possible to measure not only the most important transient thrust during running, but also the vertical force that inevitably occurs.

The present invention eliminates the above-mentioned drawbacks and has a configuration in which the linear motor ground element is housed in a plurality of housing boxes each having a steel ball and a load sensor. The present invention provides a thrust and vertical force measuring device for a single-sided induction type linear motor that can simultaneously and accurately measure vertical force.

Embodiments of the present invention will be specifically described below with reference to the drawings. In Figure 1 A and B, 1 houses the ground coil of a single-sided induction type linear motor, 2 houses the ground coil 1,
In addition, four first storage boxes 3a made of non-magnetic material fixed to the ground element 1 are attached to each of the front and rear side plates of the first storage box 2 perpendicular to the traveling direction of the traveling body, and are mounted at the mounting position. Freely rotatable steel balls 3b are attached to each of the left and right side plates of the first storage box 2 parallel to the traveling direction of the traveling body, and four steel balls are freely rotatable at the mounting positions; 30 is the first steel ball; Four steel balls are attached to each corner of the bottom plate of the storage box 2 and are freely rotatable at the attachment position. 4a is a first storage with the steel ball 3a attached so as to maintain contact with the steel ball 3a. A vertical pressure transmission plate 4b made of a non-magnetic material facing the front and rear side plates of the box 2 is a steel ball 3 so as to maintain contact with the steel ball 3c.
5 is a horizontal pressure transmission plate facing the bottom plate of the first storage box 2 to which c is attached; 5 is a steel ball that is attached to the bottom surface of the pressure transmission plate 4a, one on each side, and is freely rotatable in the mounting position; 6; is fixed on the ground, and is a second storage box made of non-magnetic material that accommodates the first storage box 2 and pressure transmission plates 4a and 4b; 7a is a pressure transmission plate that maintains contact with the vertical pressure transmission plate 4a; Two load sensors are fixed to the left and right sides of the side plate of the second storage box 6 facing 4a, and 7b is a second storage box that maintains contact with the horizontal pressure transmission plate 4b and faces the pressure transmission plate 4b. There are four load sensors fixed at each corner of the bottom plate of the box 6.

Therefore, the first storage box 2 is transferred to the second storage box 6.
The pressure transmission plate 4b contacts the load sensor 7b at the bottom, and the pressure transmission plate 4a contacts the load sensor 7a at the front and rear side surfaces and is movable on the pressure transmission plate 4b via the steel ball 5. First storage box 2
It is housed so as to maintain contact with the steel balls 3a and 3c of the first storage box 2, and to maintain direct contact with the steel ball 3b of the first storage box 2 on the left and right side surfaces.

Figure 2 A and B show the steel ball mounting mechanism.
is a steel ball, 9 is a steel ball holder, 10 is a steel ball holding plate, 1
Reference numeral 1 denotes a support for the steel ball holder 9, which corresponds to the side plate, bottom plate, and bottom surface of the pressure transmission plate 4a of the first storage box 2. The steel ball 8 can be maintained to freely roll and rotate at a fixed position by the steel ball holder 9 and the steel ball press plate 10.

Single-sided induction type linear motor thrust is generated, and the traveling object (secondary or primary of the linear motor) is generated in the direction of the arrow.
(next) shall start moving. In such a case, according to the laws of mechanics, the ground element (primary or secondary of the linear motor) receives a reaction force, and the steel balls 3b and 3c touch the inner surface of the side plate of the second storage box 6 and the upper surface of the pressure transmission plate 4b. It rotates, moves the ground element 1 and the first storage box 2 in a direction opposite to the traveling direction of the traveling body, and transmits a reaction force to the pressure transmission plate 4a via the steel ball 3a. At the same time, the steel balls 5 of the pressure transmission plate 4a rotate on the upper surface of the pressure transmission plate 4b, thereby transmitting a reaction force to the load sensor 7a.

However, since the side plate of the second storage box 6 having the load sensor 7a is fixed on the ground and is in contact with the pressure transmission plate 4a via the load sensor 7a, all of the pressure transmitted from the ground element 1 and the first storage box 2 is The reaction force acts on the two load sensors 7a. Therefore, by measuring the output of this load sensor 7a, the linear motor thrust can be measured.

The single-side induction type linear motor generates a vertical force between the ground element and the running body at the same time as thrust is generated, and depending on the magnitude of the slip, a repulsive force causes the ground element and the running body to move away from each other, or an attractive force causes the ground element and the running body to approach each other.

Now assume that a repulsive force occurs. At that time, the ground element 1 receives a downward force that tends to move away from the traveling body, and the 16 steel balls 3a and 3b rotate on the inner surfaces of the left and right side plates of the second storage box 6 and the inner surface of the pressure transmission plate 4a. The ground element 1 and the first storage box 2 are moved vertically downward, and force is transmitted to the pressure transmission plate 4b via the four steel balls 3c.

However, since the pressure transmission plate 4b is in contact with the bottom plate of the second storage box 6 fixed on the ground via the four load sensors 7b, the total repulsive force transmitted from the ground element 1 and the first storage box 2 is This will act on four load sensors 7b. Therefore, by measuring the output of this load sensor 7b, the repulsive force can be measured.

When the vertical force is an attractive force, a vertical upward force is generated, so the motion of the steel balls 3a and 3b, the ground element 1, and the first storage box 2 is completely opposite to that when the vertical force is a repulsive force, and the force is applied to the load sensor 7b. Since the acting force is reduced by the amount of the suction force, the suction force can be measured by measuring the output of the load sensor 7b.

The thrust force and vertical force described above are generated simultaneously, but the steel balls 3a, 3b, 3c and 5
Since the first housing box 2 and the first housing box 2 are moved in the combined direction of the above two forces, both of them can be measured simultaneously, and the frictional force generated due to the movement of the ground element 1 and the first housing box 2 can be measured by rolling. Since only frictional force can be used, measurement errors can be kept to a minimum.

The device for measuring the thrust and vertical force of a single-sided induction type linear motor according to the present invention has the structure explained in the above embodiment, so that it can measure not only the thrust and vertical force when the single-sided induction type linear motor is restrained, but also the It is also possible to simultaneously and accurately measure the important transient thrust and vertical force during travel on the ground side.

[Brief explanation of drawings]

Figure 1A is a plan view of the measuring device of the present invention, Figure 1B is a partially cutaway sectional view of the measuring device of the present invention, and Figures 2A and 2B are views showing the steel ball mounting mechanism of the measuring device. be. 1... Ground element, 2... First storage box, 3a, 3
b, 3c, 5, 8...Steel ball, 4a, 4b...Pressure transmission plate, 6...Second storage box, 7a, 7b...Load sensor, 9...Steel ball holder, 10...Steel ball Presser plate, 11... support.

Claims (1)

[Claims] 1. A first storage box that has a plurality of steel balls that can freely rotate in fixed positions on the front and rear, left and right sides, and the bottom, and has a linear motor ground element (primary or secondary of the linear motor) fixed inside it. in a second storage box having a plurality of load sensors on the front and rear sides and the bottom, a horizontal pressure transmission plate that contacts the load sensor at the bottom, and a horizontal pressure transmission plate that contacts the load sensor at the front and rear sides, and The steel balls are in contact with the steel balls of the first storage box through the vertical pressure transmission plate which is movable on the horizontal pressure transmission plate, and the steel balls of the first storage box are kept in contact with the steel balls of the first storage box on the left and right side surfaces. A device for measuring the thrust and vertical force of a single-sided induction type linear motor, which is characterized by being housed so as to maintain direct contact with the ball.