JPH01315293A - Controller for ac elevator - Google Patents

Abstract

PURPOSE:To operate an AC elevator by a single-phase AC power source even if a 3-phase AC power source is not disposed by rectifying the voltage of the secondary winding of an single-phase transformer connected to a 3-phase or single-phase AC power source by switching means to its primary winding as a power source for a control circuit. CONSTITUTION:A circuit breaker 2 is closed, while a circuit breaker 6 is opened at the time of normal operation. Thus, the voltage 200V of the V-phase and W-phase terminals of a 3-phase AC power source is applied at both ends of the primary winding of a single-phase transformer 13, and a predetermined AC voltage is obtained the secondary winding. This AC voltage is supplied to a control circuit 12 through a rectifier 14 and a capacitor 15. If the power source 1 is impossible to be used, the breaker 2 is opened, while the breaker 6 is closed. Thus, the voltage 100V of a single-phase AC power source 5 is applied between the terminals T2 and T3 of the primary winding of the single- phase transformer 13, and a predetermined AC voltage is obtained at the secondary winding.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a control device for an AC elevator, and in particular to a control device for an AC elevator, which converts an AC power source into a DC electric signal, and converts this DC electric signal into a three-phase AC power source using an inverter. The present invention relates to a control device for an AC elevator that drives a three-phase induction motor.

<Prior Art> In order to reduce power consumption, inverters have recently been used to control elevator drive motors.

In this case, three-phase AC power is supplied to the converter, and a DC electrical signal obtained by conversion by the converter is smoothed by a capacitor and then provided to the inverter. A control circuit is connected to this inverter, and the inverter generates an output signal of a frequency and voltage according to the output of the control circuit and supplies it to a three-phase induction motor that drives the elevator.

The output signal of this inverter controls the rotation speed and torque of the three-phase induction motor to drive the three-phase induction motor, and when electric power is regenerated from the three-phase induction motor, the control circuit detects this and consumes it. It is designed to let you do so. In this case, the output of the control circuit requires multiple DC voltages with low ripple and relatively large current capacity, so a three-phase transformer is used as the power source for the control circuit, and the secondary winding of this three-phase transformer is The obtained three-phase AC voltage is full-wave rectified to obtain the plurality of DC voltages.

For this purpose, the three-phase AC power source is connected to the primary winding of the three-phase transformer, a plurality of three-phase AC voltages are obtained from the secondary winding of the three-phase transformer, and the plurality of DC voltages are generated from the three-phase AC voltage. I'm trying to get voltage.

However, if things continue as they are, when installing an elevator where a three-phase AC power supply has not yet been installed, if the elevator is to be operated in order to install equipment in the hoistway or landing, a three-phase AC generator will be used as a temporary power source. It was inconvenient because it had to be prepared.

Therefore, in Japanese Patent Application Laid-Open No. 60-71477, a switching means is used to selectively input either a three-phase AC power source or a single-phase AC power source to the input terminal of the converter, and the input terminal of the power inverter is connected to the output terminal of the converter. A control device for an AC elevator has been proposed in which the output terminal of the power inverter is connected to the primary winding of the three-phase transformer.

According to the proposed method, when operating an elevator when installing an elevator for which three-phase AC power has not yet been installed, single-phase AC power is input to the converter using the switching means, and The DC electric signal obtained at the output terminal is applied to the inverter and is also supplied to the power inverter, and the power inverter applies a three-phase AC voltage to the primary winding of the three-phase transformer.

In this way, by inputting the single-phase AC power to the converter, even if a three-phase AC power supply is not yet installed, the inverter to which the converter's DC electrical signal is input, and the power inverter can simultaneously connect the three-phase AC A three-phase induction motor is driven by a control circuit operated by a three-phase transformer to which power is input, and the operation of the elevator is controlled.

<Problems to be Solved by the Invention> According to the system proposed above, even if a three-phase AC power source is not yet installed, it is possible to operate elevators using a single-phase AC power source to operate hoistways and landings. It is possible to remove and cut the equipment.

However, the method according to this proposal requires a power inverter and a three-phase transformer, resulting in an increase in manufacturing costs.

The present invention was made in view of the current state of control devices for AC elevators as described above, and its purpose is to enable operation using a single-phase AC power source, such as during installation when a three-phase AC power source is not installed. It is an object of the present invention to provide a control device for an AC elevator, which can significantly reduce manufacturing costs.

Means for Solving the Problems> In order to achieve the above object, the present invention provides a switching means for selecting either a three-phase AC power supply or a single-phase AC power supply, and an input terminal connected to the switching means, and an output terminal. A converter that outputs a DC electric signal to a terminal, and a converter connected to this converter that converts the DC electric signal into variable frequency three-phase AC power and supplies it to a three-phase induction motor that drives an elevator. An AC elevator control device including an inverter that drives an electric motor, a control circuit that detects and consumes regenerated power of the three-phase induction motor, and a power supply circuit that supplies power to the control circuit, wherein the power supply circuit includes: A single-phase transformer to which the three-phase AC power supply or the single-phase AC power supply is connected to the primary winding by the switching means, and the voltage of the secondary winding of this single-phase transformer are rectified, and the control circuit The configuration includes a voltage supply means for supplying a voltage to the power source.

<Function> In the present invention, during normal elevator operation, when the switching means is operated to input 200V three-phase AC power to the converter, a DC electrical signal is obtained at the output terminal of the converter; is applied to the input terminal of the inverter. At the same time, by the operation of the switching means, 200
Two phases of the three-phase AC power supply of V are input to the primary winding of the single-phase transformer, and a predetermined AC voltage is output from the secondary winding of the single-phase transformer, and is rectified by the voltage supply means and sent to the control circuit. is input.

The output signal of this control circuit is input to the inverter, and at the same time, the DC electrical signal from the aforementioned converter is input to the inverter, so the inverter outputs a three-phase AC voltage with a frequency and voltage according to the output signal of the control circuit. is output, and this three-phase AC voltage drives a three-phase induction motor to control the operation of the elevator.

If a 200V three-phase AC power supply is not yet installed, such as when installing an elevator, operate the switching means.
10 at the input terminal of the converter and the primary winding of the single-phase transformer.
Input 0V single-phase AC power. In this case, the secondary winding of the single-phase transformer outputs the same predetermined AC voltage as when the two phases of the 200V three-phase AC power supply are input, and is rectified by the voltage supply means and sent to the control circuit. is input.

In this way, the output signal of the control circuit and the DC electric signal obtained at the output terminal of the converter are input to the inverter, and the inverter generates a three-phase AC voltage with a frequency and voltage corresponding to the output signal of the control circuit, similar to that during normal operation. is output from the inverter. A three-phase induction motor is driven by this three-phase AC voltage to control the operation of the elevator.

<Example> Hereinafter, an example of the present invention will be described in detail using a block diagram showing its configuration.

As shown in the figure, each phase terminal of a 200V three-phase AC power supply 1 is connected to an input terminal of a converter 4 via a circuit breaker 2 and a normally open contact 3 of a contactor that is energized when the elevator is running. 4 is connected to an input terminal of an inverter 8, and a three-phase induction motor 9 for driving an elevator is connected to the output terminal of the inverter 8. A capacitor 7 is connected between the output terminals of the converter 4, one end of a resistor 10 is connected to one output terminal of the converter 4, the other end of this resistor 10 is connected to the collector of a transistor 11, and the 11 emitters are connected to the other output terminal of converter 4.

In addition, one output terminal of the 100V single-phase AC power supply 5 is
One end T of the primary winding of the single-phase transformer 13 is connected via the circuit breaker 6, the normally closed contact 6b of the circuit breaker 6, and the normally open contact 2a of the circuit breaker 2.
1, and the other output terminal of the single-phase AC power supply 5 is connected to the other end T3 of the primary winding of the single-phase transformer 13 via the circuit breaker 6.

Then, at the subsequent stages of the circuit breaker 2 and the circuit breaker 6, the W-phase terminal of the three-phase AC power supply 1 and the other output terminal of the single-phase AC power supply 5 are connected to each other, and similarly, the V
The phase terminal and one output terminal of the single-phase AC power supply 5 are connected to each other. Furthermore, the connection point between the V-phase terminal of the three-phase AC power supply 1 and one output terminal of the single-phase AC power supply 5 is connected via the normally closed contact 2b of the circuit breaker 2 and the normally open contact 6a of the circuit breaker 6, It is connected to the take-out end T2 of the primary winding of the single-phase transformer 13.

Further, both ends of the secondary winding of the single-phase transformer 13 are connected to the rectifier 14
The output terminal of the rectifier 14 is connected to the input terminal of the control circuit 12, and a capacitor 15 is connected between the output terminals of the rectifier 14. The output terminal of the control circuit 12 is connected to the transistor 11 described above.
and the base of a transistor 22 provided in the inverter 8, whose collector is connected to the cathode side of the diode 21, and whose emitter is connected to the anode side of the diode 21.

Furthermore, even when the single-phase AC power supply 5 is input between one end T1 and the other end T3 of the primary winding, the single-phase transformer 13 also has a three-phase AC power supply between the take-out end T2 and the other end T3 of the primary winding. Even when the W phase voltage of 1 is input, the configuration is such that the same voltage is obtained between the secondary windings. In addition, the control circuit 12
When detects the regenerated power of the three-phase induction motor 9, the output signal from the control circuit 12 causes the transistor 11 to turn to N, and the regenerated power is consumed by the resistor 10. In the inverter 8, the transistor 22 is controlled and operated by the output signal of the control circuit 12, and generates an output with a frequency and voltage corresponding to the output of the control circuit 12, thereby controlling the rotation speed and torque of the three-phase induction motor 9. is configured to do so.

In an embodiment with such a configuration, the circuit breaker 2, the circuit breaker 6
, the normally closed contact 6b, the normally open contact 6a, the normally closed contact 2b, and the normally open contact 2a constitute the switching means of the present invention, and the rectifier 14 and the capacitor 15 constitute the voltage supply means of the present invention.

Next, the operation of the embodiment of the present invention will be explained.

During normal operation, circuit breaker 2 is in the ON state and circuit breaker 6 is in the OFF state.
Perform the setting operation in the FF state. Since the normally open contact 3 is turned ON when the elevator is operating, the 200V three-phase AC power supply 1 is input to the converter 4, and the DC electrical signal obtained at the output terminal of the converter 4 is smoothed by the capacitor 7 and sent to the inverter 8. is input.

On the other hand, since the circuit breaker 2 is in the ON state, the normally open contact 2a is ON, and the V-phase voltage of the three-phase AC power supply 1 is transferred to the single-phase transformer via the normally closed contact 6b and the normally open contact 2a. The W-phase voltage of the three-phase AC power supply 1 is applied to the other end T3 of the primary winding of the single-phase transformer 13.

In this way, a predetermined AC voltage is generated between the secondary winding of the single-phase transformer 13 by the voltage of 200 V between the V-phase terminal and the W-phase terminal of the three-phase AC power supply 1 applied to both ends of the primary winding. is obtained, this AC voltage is rectified by the rectifier 14, smoothed by the capacitor 15, and this smoothed DC voltage is supplied to the control circuit 12.

Then, the DC electrical signal from the converter 4 is input to the input terminal of the inverter 8, and the inverter 8 from 1 to 22 are controlled by the output signal of the control circuit 12. A three-phase AC voltage having the same frequency and voltage is output, and this three-phase AC voltage is applied to the three-phase induction motor 9, and the three-phase induction motor 9 is driven to control the operation of the elevator.

Next, when installing or renovating an elevator, if the three-phase AC power supply 1 is not installed in a usable manner, the circuit breaker 2 should be turned off.
The circuit breaker 6 is set to the FF state and the circuit breaker 6 is set to the ON state. By turning off this circuit breaker 2, the normally open contact 2a
is turned ON, and the normally closed contact 2b is turned OFF.

For this purpose, one output terminal of the single-phase AC power supply 5 is connected to the take-out end T2 of the primary winding of the single-phase transformer 13 via the normally closed contact 2b and the normally open contact 6a, and the single-phase AC power supply 5 is connected to the other end T3 of the primary winding of the single-phase transformer 13.
connected to.

In this way, the lead-out end T of the primary winding of the single-phase transformer 13
By the voltage of 100V applied between 2 and the other end T3,
The same predetermined AC voltage as during normal operation is obtained between the secondary windings of the single-phase transformer 13, and this AC voltage is rectified by the rectifier 14 and smoothed by the capacitor 15, and this smoothed DC voltage is is supplied to the control circuit 12.

On the other hand, single-phase AC power supply 5 is input to the input terminal of converter 4 via circuit breaker 6, and the DC electric signal obtained at the output terminal of converter 4 is smoothed by capacitor 7 and input to inverter 8. . Therefore, the inverter 8 applies the three-phase AC voltage to the three-phase induction motor 9 at a frequency and voltage according to the output of the control circuit 12 in exactly the same way as during normal operation.
The elevator is controlled by driving the three-phase induction motor 9.

In addition, in either case of normal operation when the three-phase AC power supply 1 is used or during installation operation when the single-phase AC power supply 5 is used,
When the three-phase induction motor 9 generates regenerative power during operation, the control circuit 12 detects this and provides an output signal from the control circuit 12 to the transistor 11, which turns the transistor 11 into an
N, and the regenerated power is consumed by the resistor 10.

In this way, according to the embodiment, when the three-phase AC power supply 1 cannot be used, simply by operating the circuit breaker 2 and the circuit breaker 6, the 100V single-phase AC power supply 5 is used to operate the AC elevator. Operation control is performed. Furthermore, the embodiment eliminates the need for a power inverter and three-phase transformer that are required in the proposed system, simplifying the structure and significantly reducing manufacturing costs.

<Effects of the Invention> As described in detail above, according to the present invention, when the three-phase AC power supply is unavailable, the operation of the elevator is controlled using the single-phase AC power supply with a simple operation, and the structure is improved. It is possible to provide a control device for an AC elevator that is simple and has significantly reduced manufacturing costs.

[Brief explanation of the drawing]

The figure is a block diagram showing the configuration of an embodiment of the present invention. 1... Three-phase AC power supply, 2.6... Breaker, 4... Converter, 5... Single-phase AC power supply, 7.15... ...Capacitor, 8...
... Inverter, 9 ... Three-phase induction motor, 12
...Control circuit, 14... Rectifier.

Claims (1)

[Claims] a switching means for selecting either a three-phase AC power supply or a single-phase AC power supply; a converter having an input terminal connected to the switching means and outputting a DC electrical signal to an output terminal; The signal is converted into variable frequency three-phase AC power and supplied to the three-phase induction motor that drives the elevator, and the inverter that drives this three-phase induction motor detects and consumes the regenerated power of the three-phase induction motor. In the control device for an AC elevator, the power supply circuit has a control circuit for supplying power to the three-phase AC power supply or the single-phase AC power supply, and a power supply circuit for supplying power to the control circuit. Control of an AC elevator, characterized in that it has a single-phase transformer to which a phase AC power source is connected, and voltage supply means that rectifies the voltage of the secondary winding of the single-phase transformer and supplies it to the control circuit. Device.