JPH01311801A - Drive controller for current collection type self-traveling truck - Google Patents

Abstract

PURPOSE:To turn the traveling direction of a self-traveling truck by normal/ reverse turning means on the ground side by applying a rotating direction turn command to an inverter on the basis of the judged result of the phase rotating direction of a current collected 3-phase power source. CONSTITUTION:Phase rotating direction discriminating means 13 outputs a normal rotation signal 13a when the contacts 8a-8c of normal rotation driving relay 8 of normal/reverse switching means 10 in a power source 7 at the ground side are closed to connect power supply lines 2a-2c in the order of phases R, S, T. When a control circuit 14 receives the signal 13a, is applies a normal rotation command 14a to an inverter 12, while when it receives a reverse rotation signal 13b, it applies a reverse rotation command 14b to the inverter 12.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a current collector self-propelled trolley whose drive source is an inverter-controlled three-phase induction motor.

(Prior Art) FIG. 2 shows a power supply system for a current collecting self-propelled trolley in which a three-phase electric motor serving as a traveling drive source is directly driven.

That is, three-phase AC power supply lines 28 to 2c are installed along the travel route of the self-propelled vehicle 1, and each power supply line 28 to 2c is installed on the self-propelled vehicle 1.
A three-phase induction electric motor A4 for traveling drive connected to the iJ children 3a to 3c is mounted in sliding contact with the motor. 5a to 5c are contacts of a relay 5 which is controlled H by a control circuit 6, and controls the electric motor 4 on and off.

In such a power supply system, the simplest and cheapest method for switching the rotation direction of the electric motor 4 in order to operate the self-propelled trolley 1 in forward and reverse directions is to use the power supply lines 2a to 2c.
It is known that it is sufficient to replace one phase of the three-phase power supply connected to the That is, in the power supply device 7 on the ground side connected to the feeder lines 2a to 2c, for example, the feeder lines 2a to 2c
The contacts 8a to 8c of the forward rotation drive relay 8, which connects c to the R phase, S phase, and T phase in this order, and the supply TH and wires 2a to 2c are connected to T.
A forward/reverse switching means 10 consisting of contacts 9a to 9c of a reverse drive relay 9 connected in the order of phase, S phase, and R phase is provided, and by selectively energizing both relays 8.9, self-running The three-phase induction motor 4 of the truck 1 can be driven to rotate in any forward or reverse direction.

(Problems to be Solved by the Invention) However, recently, in order to smoothly accelerate and decelerate the self-propelled trolley 1 and to enable multi-stage shifting, the number of cases in which the induction electric motor a4 is controlled by an inverter has increased. An inverter is a device that converts alternating current into direct current and then converts it back into alternating current of any frequency, so even if the phase rotation direction of the three-phase alternating current on the input side is switched, the induction motor on the load side
The direction of rotation cannot be changed. In other words,
It has not been possible to adopt a driving method in which the traveling direction of the self-propelled trolley 1 is changed by a simple method of replacing one phase of the three-phase AC power supply for the power supply lines 2a to 2C.

(Means for Solving the Problems) In order to solve the conventional problems as described above, the present invention has the following features:
In a collector type self-propelled trolley whose drive source is an inverter-controlled three-phase induction motor, a forward/reverse switching means for switching one phase of the three-phase power supply is provided on the ground side, and a collector is installed on the self-propelled trolley side. Operation of a current collecting type self-propelled trolley, which is provided with means for determining the phase rotation direction of a three-phase power source, and a control circuit that gives a rotation direction switching command to the inverter based on the determination result of the phase rotation direction determination means. This paper proposes a control device.

(Operation of the invention) According to such a configuration, when the forward/reverse switching means on the ground side switches the phase rotation direction of the three-phase AC power supplied to the self-propelled bogie, the phase rotation direction determination means on the self-propelled bogie side changes. It detects that the phase rotation direction of the three-phase alternating current has been switched, and gives a rotation direction switching command to the inverter. Therefore, the rotational direction of the traveling drive induction motor controlled by the inverter is switched, and the running direction of the self-propelled truck is switched. Of course, the speed of the induction motor can be arbitrarily controlled by the inverter.

(Effects of the Invention) As described above, according to the present invention, although the induction motor that drives the self-propelled trolley is inverter controlled, one of the three-phase AC power sources on the ground side that supplies power to the induction motor is controlled by an inverter.
It has now become possible to switch the direction of rotation of the induction motor and the direction of travel of the self-propelled truck using a simple method of switching the phases.

(Example) An example of the present invention will be described below based on FIG. 1 attached.

The self-propelled trolley 11 includes an inverter 12 that controls the three-phase induction motor 4 for traveling drive, and an inverter 12 that determines the phase rotation direction of the three-phase alternating current that is supplied to the input terminal of the inverter 12 via the collectors 3a to 3c. A phase rotation direction determining means 13 that
A control circuit 14 is provided which gives a rotation direction switching command to the inverter 12 based on the determination result of the phase rotation direction determination means 13. The ground side power supply device 7 is a second
This is the same as the conventional one shown in the figure.

However, the phase rotation direction determining means 13 detects that when the contacts 8a to 8C of the forward rotation driving relay 8 of the forward/reverse switching means 10 in the power supply bag W7 on the ground side are closed, the power supply cottons 2a to 2C are in the R phase, S phase, for example. Normal rotation signal 13a when connected in the order of phase and T phase
It is configured to output a reverse rotation signal 13b when the contacts 9a to 9C of the reverse drive relay 9 are closed and the power supply lines 23 to 2C are connected in the order of, for example, T phase, S phase, and R phase. The control circuit 14 receives a normal rotation signal 13a.
When receiving a reverse rotation signal 13b, a forward rotation command +4a is given to the inverter 12, and when a reverse rotation signal 13b is received, a reverse rotation command 14b is given to the inverter 12.

Therefore, the forward/reverse switching means 10 in the power supply device 7 on the ground side
When the forward rotation drive relay 8 is energized and the contacts 8a to 8C are closed, the forward rotation command 14a is sent to the inverter 12.
is given, the induction motor 4 is rotationally driven in the forward rotation direction,
The self-propelled trolley 11 will travel forward. When the reverse drive relay 9 of the forward/reverse switching means 10 in the power supply device 7 on the ground side is energized and the contacts 93 to 9c are closed to cause the self-propelled trolley 11 to travel backwards, a reverse rotation command 14b is sent to the inverter 12. is applied, the induction electric motor 8!14 is switched to reverse drive, and the self-propelled trolley 11 is switched from forward running to backward running.

Further, the running speed of the self-propelled trolley 11 can be freely adjusted by controlling the rotational speed of the induction motor 4 using the inverter 12 as in the conventional manner.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram illustrating an embodiment of the present invention, and FIG. 2 is a circuit diagram illustrating a conventional example. 1.11...Self-propelled trolley, 23~2C...Power line, 3
a to 3c... current collector, 4... three-phase induction motor, 6.
14... Control circuit, 7... Power supply device, 8... Relay for forward rotation drive, 9... Relay for reverse rotation drive, 10...
Forward/reverse switching means, 12... Inverter, 13... Phase rotation direction determining means. Figure 1

Claims (1)

[Claims] In a collector type self-propelled trolley whose drive source is an inverter-controlled three-phase induction motor, a forward/reverse switching means for switching one phase of the three-phase power supply is provided on the ground side, and a collector is installed on the self-propelled trolley side. An assembly comprising: means for determining a phase rotation direction of a three-phase power supply; and a control circuit for selectively giving a forward rotation command or a reverse rotation command to the inverter based on the determination result of the phase rotation direction determination means. Operation control device for electric self-propelled trolleys.