JPH0419161Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) This invention is used in a multi-story parking facility in which a plurality of car mounting cages connected in a ring are vertically circulated by an induction motor to move vehicles in and out. , relates to a speed control device for arbitrarily switching and setting the circulating movement speed of a cage depending on the situation.

(Conventional technology and its problems) In this type of conventional multi-story parking facility, the induction motor, which is the drive source, is driven by direct power supply from a commercial three-phase AC power source, and a constant rate determined by the frequency of the commercial power source is used. The vehicle was being driven at high speed.

However, in actual operation, there are times when there are crowds of users and times when they are quiet. There were problems such as processing efficiency was not improved and waiting times were long, causing inconvenience to users.

In addition, in the above conventional example, since the vehicle is driven at the same speed as during the daytime even at night when there are fewer users than during the day, the noise generated by driving is loud even at night, causing noise disturbance to neighboring areas. There was also this problem.

(Purpose of the invention) This invention was made in order to solve the above problem, and the purpose is to provide a speed control device for a multi-story parking facility that can arbitrarily switch the circulation movement speed of the cage depending on the situation. shall be.

(Means for Achieving the Objective) This invention is a speed control device for a multi-story parking facility in which a plurality of car loading cages connected in a ring are vertically circulated by an induction motor to move vehicles in and out. In order to achieve the above object, an inverter that converts a commercial power source into an alternating current power source of any voltage and frequency and supplies power to the induction motor, and a speed changeover switch that has a plurality of changeover contacts operated by an operator. , a first control section that is connected to the speed changeover switch, has a plurality of speed command limiter values associated with each switching contact, and selectively outputs a corresponding speed command limiter value in response to a switching operation; , a second control section connected to the first control section and the inverter, generating a speed command signal having the output of the first control section as an upper limit, and controlling the inverter based on the speed command signal; The structure is such that the cage can be operated at any desired speed by operating a switch.

(Example) FIG. 3 is a longitudinal cross-sectional view showing a multilevel parking facility 21 to which a speed control device according to an embodiment of the invention is applied. An endless chain 25 is stretched between the arranged upper sprocket 23 and lower sprocket 24, and a vehicle W mounting cage 27 is pivotally attached to each of the tips of a number of attachment plates 26 attached to the endless chain 25 at equal pitches. The group of cages 27 is suspended and circulated by a drive source 28 provided in connection with the upper sprocket 23, and one of the cages 27 is called to the above-ground entrance/exit 22a provided on the lower wall of the building 22, and the corresponding cage is moved. It is designed to carry out loading and unloading into and out of the cage 27. Reference numeral 6 denotes an operation panel provided on the outer wall surface near the entrance/exit 22a.

FIG. 1 is a block diagram showing one embodiment of the speed control device for a multilevel parking facility according to this invention.
The figure is a block diagram showing some details. In the figure, 1 is an induction motor as a drive source 28 of the above-mentioned multi-story parking facility 21, and is connected to a commercial three-phase AC power source 5 via a converter 2, a smoothing capacitor 3, and an inverter 4. 5 is full-wave rectified by a converter 2, this rectified output is maintained at a constant DC voltage by a smoothing capacitor 3, and this is converted into AC power of arbitrary voltage and frequency by an inverter 4, which is then supplied to the induction motor 1. It is composed of Reference numeral 6 denotes an operation panel installed near the entrance/exit 27 of the multi-story parking facility 21 mentioned above, and this operation panel 6 is used to switch and set the operating speed of the multi-story parking facility 21, that is, the circulating movement speed of the cage 27. A speed changeover switch 7 is provided. This speed changeover switch 7 is connected to an inverter control section 8 at the next stage.

The inverter control unit 8, as shown in FIG.
A plurality of speed command limiter values V 1 to _{V o} are set in correspondence to the switching contacts a ₁ to a _o of the speed changeover switch 7.
is stored in advance in the form of a data map.
9 (corresponding to the first control section) and an arbitrary speed command limiter value V selected from this ROM9,
Consisting of a speed command section 10 that outputs a speed command signal with this as the upper limit, and an output stage 11 that receives the speed command signal from the speed command section 10 and causes the inverter 4 to follow the speed command signal. has been done. Note that the combination of the speed command section 10 and the output stage 11 corresponds to the second control section. In the speed command unit 10, 10a is a limiter that performs a control operation based on the speed command limiter value output from the ROM 9, and 10b is a limiter that creates acceleration and deceleration commands for car calling under the limitations of the speed command limiter value of the limiter 10a. This is the command creation department. The output stage 11 is composed of an OP amplifier, and follows the speed command signal by comparing and calculating the actual rotational speed of the induction motor 1 detected by the rotary encoder 12 directly connected to the induction motor 1 and the speed command signal. The inverter 4 is controlled to supply the induction motor 1 with AC power having a voltage and frequency commensurate with the output.

In the speed control device having the above configuration, the operator sets the speed changeover switch 7 on the operation panel 6 to the changeover contact ai (i: 1 to n) corresponding to the desired cage circulation movement speed.
When the switching operation is performed, the next stage inverter control unit 8 reads the speed command limiter value Vi (=V) (i:1
-n) is selected, and a speed command signal having this speed command limiter value as an upper limit is sent from the speed command section 10 to the output stage 11. The output stage 11 then provides an output corresponding to the speed command signal to the inverter 4. As a result, inverter 4 and converter 2,
The commercial power supply converted into DC voltage by the smoothing capacitor 3 is converted into AC power with a voltage and frequency corresponding to the speed command signal, and the AC power is supplied to the induction motor 1. That is, the operator presses the speed changeover switch 7.
When set to low-speed operation, commercial power is converted to low-voltage, low-frequency AC power and the induction motor 1
, and vice versa, the speed changeover switch 7
When set to high-speed operation, the rotational speed of the induction motor 1 is increased by converting it into high-voltage, high-frequency alternating current power.

Therefore, when the operator is crowded with users, the operator can increase processing efficiency and reduce waiting time by switching the speed selector switch 7 to high-speed operation, but when there are not many users, the operator can switch to low-speed operation. Then, the operation can be carried out in a timely manner.

Note that there is a relationship P∝ωT (1) between the output P of the induction motor 1, the rotational speed ω, and the torque T, and the output P of the induction motor 1 decreases during low-speed operation. On the other hand, input P _io to inverter 4
There is a relationship between P _io = P/overall efficiency (2) between the output P and the overall efficiency of the induction motor 1, and the overall efficiency is slightly lower in the above low-speed operation performed by lowering the output frequency of the inverter 4. Although it decreases, the input P _io to the inverter 4 decreases by the amount that the output P of the induction motor 1 decreases.
will also decrease. In other words, power consumption is reduced during low-speed operation.

(Effects of the invention) As described above, according to the speed control device for a multilevel parking facility of this invention, the circulation movement speed of the cage can be easily adjusted according to the situation, such as when the number of users is crowded or when it is quiet. Therefore, we can respond flexibly to the situation by increasing the driving speed during busy periods to increase processing efficiency and shorten waiting times, or lowering the driving speed at night when users are quiet to keep the noise generated by driving to a low level to prevent noise disturbances. Benefits include being able to take appropriate action.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the overall outline of a speed control device for a multilevel parking facility, which is an embodiment of this invention, Fig. 2 is a block diagram showing the specific configuration of a part thereof, and Fig. 3 is a block diagram of this invention. 1 is a longitudinal cross-sectional view showing a multi-story parking facility to which speed control is applied, which is one embodiment of the present invention. 4...Inverter, 7...Speed selector switch,
8...Inverter control section.

Claims (1)

[Scope of utility model registration request] In a multi-story parking facility in which a plurality of car mounting cages connected in a ring are vertically circulated by induction motors to move vehicles in and out, commercial power is converted to AC power of any voltage and frequency, and the induction An inverter that supplies power to an electric motor, a speed changeover switch having a plurality of changeover contacts operated by an operator, and a plurality of speed command limiter values connected to the speed changeover switch and associated with each of the changeover contacts. a first control section that selectively outputs the corresponding speed command limiter value in accordance with the switching operation; and a first control section that is connected to the first control section and the inverter and sets the output of the first control section as an upper limit. A speed control device for a multilevel parking facility, comprising: a second control section that generates a speed command signal to control the inverter based on the speed command signal.