JPS6359944B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention provides a device for controlling the startup of an elevator;
In particular, the present invention relates to an improvement in a starting control device for an elevator having a gear reduction gear made up of parallel shaft gears such as helical gears.

Generally, an elevator is constructed as shown in FIG.

In the figure, 1 is a three-phase induction motor that drives a sheave 3 via a reduction gear 2. A main rope 4 is wound around the sheave 3, and a cage 5 and a counterweight 6 are connected to both ends of the main rope. 7 is a well-known electromagnetic brake that restrains or releases the electric motor 1. In addition, the weight of the counterweight 6 is 50% of the rated loading capacity of the car 5.
% of the weight of the car 5 loaded with the load.

Incidentally, the speed reducer 2 is normally constructed of a worm and a worm gear (hereinafter simply referred to as a worm), but recently it has been proposed to be constructed using a parallel shaft gear such as a highly efficient helical gear from the viewpoint of energy saving. ing.

However, since helical gears have greater backlash than worm gears, the following problems occur.

Now, the weight of the car 5 and the weight of the counterweight 6 are almost balanced (hereinafter referred to as the balanced load state).
Suppose it is in When the car 5 starts, the electromagnetic brake 7 is released to release the electric motor 1, and
Voltage is applied to electric motor 1, but at this time reducer 2
Because the teeth of the helical gear are in the above equilibrium load state,
Assume that, as shown in FIG. 2, the teeth 8a of the sheave side gear 8 and the teeth 9a of the motor side gear 9 are not in contact with each other. Here, when the motor side gear 9 rotates in the direction of the arrow, its teeth 9a contact the teeth 8a of the sheave side gear 8, a=γ・ω where, a: acceleration γ: radius of the pitch circle of the electric motor gear 9 ω : The collision will occur at an acceleration a of the angular velocity at the time of the collision of the teeth 9a. The impact caused by this collision is transmitted to the car 5, worsening the riding comfort.

This invention is intended to improve the above-mentioned problems, and aims to provide an elevator startup control device that alleviates the deterioration in riding comfort caused by collisions between gear teeth of a reduction gear during startup in a balanced load state. .

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

In FIGS. 3 and 4, 11 is a well-known load detection device that detects the load inside the car 5, 12 is a load state detection circuit that detects whether the car 5 is in a balanced load state, and 13 is a load state detection circuit that detects whether the car 5 is in a balanced load state. The speed command signal 13a increases at a predetermined slope when starting, or the signal 13a increases by a time t.
14 is an ignition control circuit; 15 is a three-phase AC power source 16 which is applied to the electric motor 1; 15 is a thyristor and the like;
This is an acceleration control device that controls the phase of the voltage.

Next, the operation of this embodiment will be explained.

When the car 5 is started, the load state detection circuit 12 detects the load state of the car 5 based on the output of the load detection device 11. And in case of unbalanced load condition,
A speed command signal 13a is issued from the speed command generation circuit 13, and the ignition control circuit 14 and acceleration control device 15
The electric motor 1 is accelerated through the .

In the case of a balanced load state, the speed command generation circuit 1
3, a speed command signal 13b is issued, and its slope is made gentler by a time t. Now, electric motor 1
starts slowly, and the collision speed of the teeth 9a of the gear 9 shown in FIG. 2 also becomes low. As a result, the acceleration of the car 5 at startup changes as shown by curves 17 to 18 in FIG. 5, and the riding comfort is improved.

Note that the time t in FIG. 4 is not constant and may be changed depending on the output of the load state detection circuit 12.

As explained above, in the present invention, in an elevator having a gear reduction gear made up of parallel shaft gears, when the car and the counterweight are in equilibrium, the speed command signal at the time of starting the car is changed to the normal speed command signal. Since the increase is made to occur at a gentler slope, it is possible to start the balanced load state when the teeth of the sheave side gear and the teeth of the motor side gear of a gear reducer consisting of parallel shaft gears are not in contact with each other. In some cases, it is possible to alleviate the deterioration in riding comfort caused by collisions between the teeth of the gears of the reducer, and even if the backlash of the gears of the reducer is large, it is possible to improve the riding comfort at the time of startup in a balanced load state.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a conventional elevator starting control device, Fig. 2 is an explanatory diagram of the meshing of gears in the reducer of Fig. 1, and Fig. 3 shows an embodiment of the elevator starting control device according to the present invention. 4 is an output curve diagram of the speed command generation circuit of FIG. 3, and FIG. 5 is an acceleration curve diagram of the car of FIG. 3. 1...Three-phase induction motor, 2...Reducer, 5...
Car, 6... Balance weight, 11... Load detection device, 12... Handled load condition detection circuit, 13... Speed command generation circuit, 14... Firing control circuit, 15...
In the acceleration control device, the same parts in the figures are indicated by the same reference numerals.

Claims (1)

[Claims] 1. In a car that is driven through a gear reducer composed of parallel shaft gears and starts the car with a speed command signal that increases at a predetermined slope, detects the load in the car where the car and counterweight are balanced. a balanced load detection circuit, and a slope change circuit that makes the slope of the speed command signal at the time of starting the car more gentle than the predetermined slope when the car is unbalanced when the balanced load detection circuit detects the balanced state. Features: Elevator startup control device.