JPS5813468B2 - Elevator position and speed converter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a position/velocity conversion device used in elevators and the like.

In general, moving objects such as elevators move along a finite length of travel path, so the speed of movement is limited at both ends of the travel path in order to maintain safety.

For this reason, consideration has been given to maintaining safety by detecting the position of the elevator car and comparing the car speed with the speed corresponding to the detected position, which is the output of a preset position/speed converter.

The present invention eliminates the drawback of detected position errors in conventional position and speed converters and provides a highly accurate position and speed converter.

A conventional position/velocity conversion device will be explained with reference to FIGS. 1 and 2.

In Fig. 1, 1 is a hoistway, 2 is a guide rail installed in the hoistway 1, 3 is an elevator, and 4 is a guide device consisting of a well-known roller guide shoe attached to the elevator 3, which is a flexible body. It has three rollers supported with anti-vibration,
This engages the guide rail 2.

Reference numeral 5 denotes a cam that is disposed at each end of the hoistway 1, and is attached to a plurality of support arms protruding from the guide rail 2, so that one end is closer to the guide rail 2 than the other end toward the end. It is set up.

6 is a position speed converter fixed to the elevator and 3;
As shown in FIG. 2, this is a voltage converter based on a well-known variable coupling transformer.

By rotating the shaft 6a, the degree of coupling M of the transformer changes, and the degree of transformation of the transformer on the primary side and the secondary side changes.

The arm 6b has one end fixed to the shaft 6a and the other end pivotally supporting the wheel 6C, so that only the wheel 6c comes into contact with the cam 5.

In Fig. 2, 6d is the primary winding of the variable coupling transformer;
6e is a secondary winding, 6f is a rectifier diode, and the four of them constitute a well-known full-wave rectifier circuit as shown in FIG.

A capacitor 6g is connected to the output end of the full-wave rectifier circuit to reduce ripple.

7 is a commercial AC power source. In FIG. 1, an elevator car 3 is guided by a guide rail 2 and moves up and down.

When the elevator carousel 3 is moving up and down in the middle of the hoistway 1, the arm 6b of the position/velocity converter 6 is hanging down as shown in FIG.

Now, when the elevator 3 rises from the state shown in Figure 1,
As the elevator carousel 3 rises, the roller 6C of the position/velocity converter 6 comes into contact with the cam 5, so that the shaft 6a is rotated clockwise via the arm 6b.

That is, by rotating the shaft 6a in the clockwise direction, the degree of coupling of the variable coupling transformer in FIG. 2 decreases, and the voltage induced in the secondary winding 6e decreases.

This position/speed converter uses a cam 5 to express the position from the end of the elevator car 3 as a rotation angle of a shaft 6a of a position/speed converter 6, and uses the output of a variable coupling transformer as a speed instruction value.

However, since the guide tool 4 is supported in a vibration-proof manner, when the guide tool 4 flexes, the elevator heel 3 is displaced in the left-right direction in FIG. 1 with respect to the guide rail 2.

This displacement causes an error in the rotation angle of the shaft 6a of the position and speed converter 6, making it difficult to obtain a highly accurate position and speed converter.

The present invention aims to solve the above-mentioned problems and provide an elevator position/velocity conversion device that is not affected by lateral displacement of an elevator corner with respect to a guide rail.

An embodiment of the present invention will be described below with reference to FIGS. 3, 4, and 5.

In the figure, the same reference numerals as in FIGS. 1 and 2 indicate the same parts.

5' is a second cam disposed at a position symmetrical to the cam 5 with respect to the guide rail 2.

Reference numeral 6' denotes a second position/velocity converter fixed at a position symmetrical to the position/velocity converter 6 with respect to the guide 4.

6a', 6b', and 6c' correspond to the shaft 6a, arm 6b, and wheel 6c, respectively.

6'd, 6'e, 6'f, and 6'g correspond to the primary winding 6d, secondary winding 6e, rectifier diode 6f, and capacitor 6g of the variable coupling transformer, respectively.

In addition, when the rotation angles of the shafts 6al6'a are equal, by applying the same AC voltage to the primary windings 5d and 5'd, the
It is assumed that variable coupling transformers A and B are manufactured so that the voltages induced in the next windings 6et6'e are equal.

In FIG. 3, the position and speed converter 6' is fixed at a position symmetrical to the position and speed converter 6 with respect to the guide 4, so that as the elevator shaft 3 rises, the roller 6' of the position and speed converter 6' changes. The difference in operation from the position/velocity converter 6 is that since C contacts the cam 5', the shaft 6'a is rotated counterclockwise via the arm 5/b.

Now, when the elevator claw 3 rises from the state shown in FIG.
/c contacts cam 5' at the same time and further rises, causing shaft 6a to move clockwise through arm 6b and arm 5/b.
By adding the outputs of the respective position/velocity converters 6, 6' in which 6'a is rotated counterclockwise through equal angles, the velocity value for the desired position can be obtained as shown in FIG. The circuit configuration shown in is assumed.

That is, as explained above, when the rotation angles of the shafts 6a+6'a are equal, the voltages induced on the secondary sides of the variable coupling transformers A and B are equal, and if the output at both ends of the capacitor 6g is 1, then the output of the capacitor 6g is v2. is also ■1, and by connecting the (C) terminal of the capacitor 6g and the (G) terminal of the capacitor 6'g as shown in Figure 4, the (
If an output can be obtained between the +) terminal and the (→) terminal of the capacitor 6'g, then the output is ■.

Then V0:V1+V2-2V1-2V2......
(1) vo is expressed as a function of the position of elevator car 3 from the end. If the distance from the end to elevator car 3 is S, then Vo-f (S) = 2V1-2V2 ...... (2) .

Now, if for some reason the elevator 6 is displaced to the left at a position S from the end in Figure 3, then the shaft 6
a rotates counterclockwise by an amount corresponding to the amount of displacement, and the shaft 5
/a rotates counterclockwise by an amount corresponding to the amount of displacement.

In other words, the position/velocity converter 6 perceives that the position of the elevator car 3 has changed further from the terminal than the current position, and the position/velocity converter 6' perceives that the position of the elevator car 3 has changed further from the terminal than the current position. I take it as something that has changed as if it was getting closer.

If the value obtained by converting the amount of displacement caused by the displacement of the elevator shaft 3 into the amount of movement in the vertical direction of the elevator shaft is ΔS, then the output of the position speed converter 6 is set as v11, and from equation (3)? Become.

Also, assuming that the output of the position/velocity converter 6' is 2, the equation (3) is obtained.

What if we consider up to the third term using Taylor expansion from equations (4) and (5)? In general, the elevator speed-distance function V=f(
S) can be considered to be a monotonically increasing function, and the second term of equation (7) is △
If S is small, V11+■2kif(S)......(8)
becomes.

From equations (2) and (8), ■02■1+V2-■11+v22......(9) is obtained.

In other words, V1+V2 in equation (9) is the elevator or 3 is △
These are the values when there is no displacement of S, and V1 and +V2 are the values when the elevator and 3 are displaced by ΔS, both of which are V.

It is expressed as a closing. This means that even if the elevator shaft 3 is displaced from side to side in FIG. 3 due to the bending of the guide member 4, the displacement will not appear as a position error in the output of the position/velocity converter.

FIG. 5 shows a circuit configuration in which the rectifier diode 5/r and capacitor 6'g of the position/velocity converter 6' in FIG. 4 are omitted to obtain the same effect as that in FIG. 4 at a low cost.

As described above, according to the present invention in which the cam position/velocity converters are arranged symmetrically, even if a displacement occurs due to the bending of the guide, the displacement is converted into a position error as the output of the position/velocity converter. Since it can be prevented from appearing, it has the effect that positional errors can be eliminated by simple means.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram for explaining a conventional position/velocity conversion device in a hoistway, Fig. 2 is a circuit configuration diagram of a conventional position/velocity converter, and Fig. 3 is a position/velocity converter in a hoistway according to the present invention. FIGS. 4 and 5 are schematic configuration diagrams for explaining the apparatus, and are circuit configuration diagrams of the position/velocity converter of the present invention. In the figure, 1 is a hoistway, 2 is a guide rail, 3 is an elevator, 5 and 5' are cams, and 6 and 6' are position and speed converters.

Claims (1)

[Claims] 1 A cam installed symmetrically on the elevator guide rail,
A position and speed converter for an elevator, comprising a position and speed converter provided at an elevator heel corresponding to the cam, and the sum of the outputs of the position and speed converters is set as a position speed at an end point stop.