JPS6118511B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement in a device for controlling the speed of an elevator.

AC elevators that use speed feedback control of the induction motor to control the car speed usually do not have a car load detection device for economic reasons, so the control characteristics change due to car load fluctuations, resulting in poor ride comfort. There is a problem.

Therefore, in order to absorb this load fluctuation, the speed reference signal is adjusted, but if the adjustment is made when the car load is no load, the characteristics will deteriorate when the car is fully loaded. Therefore, it is difficult to obtain an optimal speed reference signal that absorbs all car load fluctuations.

In order to satisfy this requirement, it is necessary to install a car load detection device, but this has the disadvantage of being expensive.

The present invention is intended to improve the above-mentioned problems, and an object of the present invention is to provide an elevator speed control device that can obtain a speed reference signal commensurate with the car load and operate the car with a comfortable ride without installing a car load detection device. shall be.

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

In the figure, 1 is a 24-hour timer that emits an output during the work time and clock-out time, and 2 is a rising congestion signal 2a that operates based on the output of 24-hour timer 1.
or a pattern selection device in which the descending congestion signal 2b becomes "H"; 3 is a car call registration number detection device in which the number of registered car calls is detected and when the number exceeds a predetermined number, the output 3a becomes "H"; 5a is a device for detecting the number of registered calls for going down the hall, and when the number exceeds a predetermined number, the output 4a becomes "H"; and 5a is a rising travel command, which becomes "H" when a command to go up is given. The signal 5b is also a descending travel command signal,
6 and 7 are AND gates, and 8 is a full load increase speed reference signal 8a, a full load decrease speed reference signal 8b, and a regular speed reference signal set in advance in a built-in speed reference signal setting means (not shown). A speed reference signal selection device 9 selects and outputs one of the speed reference signals 8a to 8c and a car speed signal 10 to perform speed feedback control of an induction motor (not shown) for driving the car. It is a control device.

Next, the operation of this embodiment will be explained.

When the 24-hour timer 1 outputs an output at the start of the work period, the rising congestion signal 2a from the pattern selection device 2 becomes "H". When passengers get into the car and press the destination floor buttons one after another, and the number of registered car calls reaches a predetermined number or more, the output 3a of the registered car call number detecting device 3 becomes "H". Furthermore, when the door closing command signal 5a becomes "H", the output of the AND gate 6 becomes "H". Based on this output, the speed reference signal selection device 8 selects and outputs the full load increase speed reference signal 8a. Thereby, the speed control device 9 performs speed feedback control in accordance with the speed reference signal 8a suitable for full load rising operation.

The detection of the number of registered car calls is performed each time the car stops at each floor, and when the number of registered calls becomes less than a predetermined number, the output 3a becomes "L" and the output of the AND gate 6 also becomes "L". At this time, the output of AND gate 7 is also "L". In this way, when the outputs of the AND gates 6 and 7 are both "L", the speed reference signal selection device 8 selects and outputs the regular speed reference signal 8c. The car will now run normally.

Next, when the 24-hour timer 1 outputs an output at the time of leaving work, the downward congestion signal 2b from the pattern selection device 2 becomes "H". Output 4a of the down-hall call registration number detection device 4 and down-travel command signal 5
When both signals b become "H", the output of the AND gate 7 becomes "H". Based on this output, the speed reference signal selection device 8 selects and outputs the full load lowering speed reference signal 8b, and the car is speed controlled in accordance with the speed reference signal 8b suitable for full load lowering operation. When the running direction of the car changes from downward to upward, the downward running command signal 5b becomes "L" and the output of the AND gate 7 also becomes "L". At this time, since the output of the AND gate 6 is also "L", the regular speed reference signal 8c is output as described above.

In addition, the output 4 of the device 4 for detecting the number of registered down-hall calls
A may be configured so that a becomes "H" only when the running direction of the car changes from ascending to descending.

FIG. 2 shows another embodiment of the present invention, in which 1
1 and 12 are OR gates. The rest is the same as in FIG.

When either the rising congestion signal 2a or the car call registration number detection device output 3a becomes "H", the output of the OR gate 11 becomes "H", and when the rising running command signal 5a becomes "H", the AND gate 6 becomes "H", so that the speed reference signal selection device 8 selects and outputs the full load increase speed reference signal 8a. Similarly, either the descending congestion signal 2b or the output 4a of the device for detecting the number of registered descending calls at the landing is "H".
Then, the output of the OR gate 12 becomes "H", and if the descending travel command signal 5b becomes "H",
The output of the AND gate 7 becomes "H", so that the speed reference signal selection device 8 selects and outputs the full load lowering speed reference signal 8b. If you do this,
Even when the number of registered car calls is greater than a predetermined value and the number of registered car calls is above a predetermined value and an upward travel command is issued, the full load increase speed reference signal 8 is generated even when the upward movement is not crowded.
a, and is operated by the full load descending speed reference signal 8b when descending travel is commanded during upward congestion, or when descending travel is commanded when the number of registered calls for going down the hall is more than a predetermined value and the descending travel is commanded even when it is not during descending congestion. .

Furthermore, if the 24-hour timer 1 is changed to a one-week timer that outputs an output based on a combination of day of the week and time, the service will be further improved.

Note that although the embodiment has been described with respect to an AC elevator, the present invention may also be applied to a DC elevator.

As explained above, in this invention, a preset speed reference signal is selected based on the car load predicted from the number of registered calls exceeding a predetermined value and the running direction of the car. Since the speed of the car driven by the electric motor is controlled, even if the load inside the car changes, the elevator can be operated with less fluctuation in the acceleration and deceleration of the car, and with a comfortable ride. This can be achieved with inexpensive equipment.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram showing one embodiment of an elevator speed control device according to the invention, and FIG. 2 is a block circuit diagram showing another embodiment of the invention. 3...device for detecting the number of registered car calls, 4... device for detecting the number of registered calls going down the hall, 5a...upward travel command signal, 5b...downward travel command signal, 6,7...
AND gate, 8...Speed reference signal selection device, 9
...Speed control device, 10...Speed signal. Note that the same parts in the figures are indicated by the same reference numerals.

Claims (1)

[Claims] 1. In a device that controls the speed of a car driven by an electric motor using a speed reference signal, a call registration number detection device that detects the number of registered calls and operates when it exceeds a predetermined value, and a running device that commands the running direction of the car. A direction command device, a heavy load speed reference signal used when the electric motor generates a torque exceeding a predetermined value depending on the load condition of the car and the driving direction, and a signal lower than this heavy load speed reference signal. a speed reference signal setting means for setting a speed reference signal for light load, which is used to align the speed of the car with the speed at the time of heavy load when the electric motor generates a torque less than the predetermined value; A speed control device for an elevator, comprising a speed reference signal selection device that selectively outputs a signal from the speed reference signal setting means in response to the operations of the registration number detection device and the running direction command device.