JPS5820612Y2 - elevator elevator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an elevator control device, and is designed to reduce the follow-up delay of the elevator when changing from a steady running state to a deceleration state, especially in an AC feedback elevator, and to smoothly transition to a deceleration state. This invention relates to an elevator control device.

Figure 1 shows the schematic configuration of an elevator. In the figure, IM is an induction motor, PG is a speed detector that detects the rotational speed of this motor IM, BK is a brake, G is a gear, DM is a drum, and W is the counterweight and B is the elevator car.

As is clear from the figure, springs are used for the cage B and the counterweight w, and the rope itself also has spring characteristics.

FIG. 2 shows an example of a conventional elevator control device, in which IM is an induction motor, PG is a speed detector, SL,
S2 is a thyristor controlled by a gate control circuit (not shown), and these thyristors S1 v S
An anti-parallel circuit of two thyristors constitutes a bidirectional switch SW.

Futa MC is an electromagnetic switch for switching elevators up and down.
PC is a phase shift circuit, CA1 is a control amplifier, and a resistor R0 and a capacitor C1 are connected in parallel to the inverting amplifier AMP between the input and output sides of the inverting amplifier AMP.

The circuit of resistor R1 and capacitor C□ is for steady operation of the elevator (induction motor).

The AC in the case is a spliced circuit, Xl is the acceleration contact, X2
is the deceleration contact, Tvl is the acceleration pattern setting circuit, TV
Reference numeral 2 denotes a deceleration pattern setting circuit, and these acceleration and deceleration pattern setting circuits T Vlt TV2 constitute a driving (speed) pattern setting circuit TV.

The housing CL is a controller that is supplied with a position signal from the elevator car, supplies an acceleration command to the acceleration pattern setting circuit TV, and supplies a deceleration command to the deceleration pattern setting circuit TV2.

Here, when the elevator is in ascending or descending operation, the acceleration contact X1 is closed during acceleration operation, and the output of the acceleration pattern setting circuit TV1 is supplied to the matching circuit AC, and during deceleration operation, the deceleration pattern setting circuit Tv2 is supplied. is supplied to the matching circuit AC, and the elevator is controlled according to the operating speed pattern setting characteristic, which is the ideal state shown in FIG.

Note that FIG. 3 shows an ideal operating speed pattern when the elevator is ascending and descending.

Conventionally, when controlling the raising and lowering of an elevator using the elevator control device shown in Fig. 2, the speed pattern of the elevator (induction motor) was set in advance by the setting circuit TV to ideal operation as shown in Fig. 3. A speed pattern is set and an attempt is made to make the elevator follow this set pattern, but if a delay in tracking occurs at the transition point from steady operation to deceleration operation, it becomes difficult to obtain ideal operating characteristics.

In addition, when increasing the transient response of the control AMP to prevent tracking delays, resonance with the spring system and rope system, which are the vibrating elements of the mechanical system, is likely to occur, and although the transient tracking characteristics are improved,
On the whole, the ride becomes uncomfortable.

In order to avoid resonance with various vibration elements of the mechanical system, it becomes necessary to lower the transient response speed of the control system, and if the transient response speed is lowered in the IT circuit shown in Figure 2, it will be difficult to follow up at the deceleration start point. The delay becomes large, resulting in deceleration characteristics shown in FIGS. 5A and 5B, resulting in poor followability and ride comfort.

The present invention was developed in view of the above points, and is an elevator that reduces the transient gain of the control amplifier during deceleration while increasing the initial response speed, eliminating the above drawbacks, and allowing smooth start of deceleration. The purpose is to provide a control device.

An embodiment of the present invention will be described below with reference to FIG.

In this embodiment, as shown in FIG.
In addition to the series body consisting of the capacitor C1 and the contact AX, that is, the constant circuit for steady operation, the series body consisting of the capacitor C2, the resistor type, and the normally open contact BX, which is closed by the deceleration command, or the deceleration control constant circuit, is connected to the inverting amplifier. A
Control amplifier CA2 is connected in parallel between the input and output sides of MP.
and a detection circuit CA3 for further operating contact BX.
It consists of:

In the elevator control device having the above configuration, during steady operation, the contact AX is closed, and the control amplifier CA2 is connected to C1 and R1.
Amplification control is performed using the control constant of
is closed, and at the same time the deceleration pattern circuit Tv2 begins to operate, the contact between the output of the comparator CA3 and the relay BX is also closed.

When the electric motor IM is under a load such that braking torque is required during steady running, the AX circuit opens, the BX circuit closes, and the bias circuit VR' and A braking torque is generated from the initial bias value given to C2 by the dog', and the deceleration state is shifted.

In addition, when the electric motor IM is in a loaded state that requires driving torque during steady running, a deceleration command is given as shown in Figure 5, and the output of the control AMP decreases as the speed pattern decreases, and the output of the control AMP decreases to approximately O. The comparator operates at the point where B
At the same time as closing X, open AX, and as above, BIAS
The control torque is switched to a control torque having an initial BIAS value given in advance by the circuit, and a transition is made to a deceleration state.

Now, we will show the response characteristics when we set CI + R1 constants that allow stable control without resonance with the mechanical system during deceleration using only the CI and RI systems, and perform deceleration control only by switching between acceleration and deceleration of the speed pattern. The speed characteristic becomes as shown in FIG. 5A and FIG. 5A, and a large follow-up delay occurs due to a reduction in the transient gain to avoid resonance with the mechanical system, resulting in a speed characteristic as shown in FIG. 5A.

Using the circuit of the present invention, the transient gain of the acceleration control system and deceleration control system can be switched, and an appropriate initial B can be set at the deceleration start point.
By providing IAS, it is possible to obtain quick response and stable control as shown in FIG. 5B and FIG.

As explained above, the present invention, in an AC feedback control elevator, changes the time constant of the control amplifier between steady state and deceleration, sets a small transient gain during deceleration control to smoothly decelerate, and In order to prevent a follow-up delay due to a decrease in speed, a constant bias voltage is superimposed at the deceleration switching point from the steady operating state.

Therefore, according to the present invention, when the elevator is brought into a decelerating state, unnecessary vibrations due to vibrations of the mechanical system and changes in torque characteristics can be prevented, and an elevator with a comfortable ride can be obtained.

[Brief Description of the Drawings] Fig. 1 is a configuration diagram of an elevator, Fig. 2 is a block wiring diagram showing an example of a conventional elevator control device, and Fig. 3 is a block diagram showing an example of a conventional elevator control device.
A waveform diagram showing the ideal operation pattern of the induction motor in Fig.
FIG. 4 is a wiring diagram showing an embodiment of the elevator control device according to the present invention, and FIGS. 5A to 5B are characteristic diagrams for explaining the operation of the elevator control device. IM...Induction motor, PG...Speed detector, CL...Controller, TV...
・Time versus operation pattern setting circuit, AC... Matching circuit, CA2 ・Music control amplifier, AMP...
・Inverting amplifier, BX... Normally open contact, C2...
... Capacitor, border ... Resistor, PC ...
...Phase shift circuit.

Claims (1)

[Scope of utility model registration request] The speed signal of the induction motor is compared with the operating speed pattern setting signal, and the deviation signal is supplied to the induction motor via a control amplifier including an inverting amplifier and a phase shift circuit, so that the induction motor is operated by speed control. In the elevator control device, the inverting amplifier includes a steady operation constant circuit having a normally closed contact that is opened in response to a deceleration command for the elevator, and a deceleration control constant circuit that is connected to a bias circuit and connected to the inverting amplifier in response to the deceleration command. An elevator control device characterized in that it is configured by connecting in parallel.