JP2005324885A - Elevator control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To lower requisite power capacity without increasing the requisite space of an elevator. <P>SOLUTION: The elevator control device is equipped with a main motor 8 to rotate the main sheave 9 of a plurality of sheaves supporting an elevator car 10 and a balance weight 12 through a rope 13 in such a way as movable in the vertical direction and an auxiliary motor 30 attached to the auxiliary sheave 11 installed near the balance weight. The main motor 8 is driven chiefly by the electric power supplied from an external power supply 1. The auxiliary motor 30 is put in regenerative operation to accumulate the regenerated power when the elevator is in the regenerative operation and supplies the accumulated power when the elevator is in the power running to the auxiliary motor 30. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an elevator control device that converts alternating current into direct current with a rectifier, further converts this direct current into alternating current with an inverter, and supplies the elevator car to a motor that moves up and down.

  Generally, in an elevator control device, a three-phase alternating current supplied from an external commercial alternating current power source is once converted into direct current with a rectifier, and further converted into alternating current with an inverter to convert the direct current into an elevator car. I am trying to supply. In order to reduce the burden on the motor, a counterweight is provided to the car via a sheave. Furthermore, a power storage device that stores regenerative power generated by providing a counterweight is provided, and the power stored in this power storage device is supplied to the motor during powering operation of the motor, and the peak value of power supplied from the outside is obtained. The power consumption is reduced and the required power capacity of the elevator control device is reduced (see Patent Document 1).

FIG. 3 is a schematic configuration diagram of an elevator control device in which the above-described power storage device is incorporated.
The three-phase AC supplied from the external power source 1 which is a three-phase commercial AC power source is full-wave rectified by the rectifier 2 formed of a diode bridge circuit, and the ripple is absorbed by the smoothing capacitor 3 and supplied to the inverter 4. This inverter 4 has a configuration in which a parallel circuit of a switching element 5 and a diode 6 is bridge-connected, and is smoothed by a smoothing capacitor 3 based on a gate signal for each switching element 5 from the operation control unit 7. The direct current is converted into a three-phase alternating current and supplied to the main motor 8. The main motor 8 controls the rotation of the main sheave 9.

  The rope 13 having both ends fixed to the ceiling of the top floor of the building includes a car sheave 10a, 10b to which the car 10 is attached, a main sheave 9 to which the main motor 8 is attached, and a counterweight (C / W) 12. It is hung on the attached secondary sheave 11. Thus, by adopting a 2: 1 roping method in which the car 10 and the counterweight 12 are not connected to both ends of the rope 13, the rotational force (torque) required by the main motor 8 can be reduced to ½.

  Therefore, the operation control unit 7 controls the operation of the main motor 8 via the inverter 4 in accordance with the car call operation of the passenger of the elevator, and moves the car 10 up and down to the destination floor.

  In the relationship between the weight of the car 10 in the state where the passenger is on and the weight of the counterweight 12, the main motor 8 is in the power running operation during the period when the heavy side is rising, and the heavy side is falling. During the period, the main motor 8 operates as a generator and enters a regenerative operation state. The weight of the counterweight 12 is, for example, a weight corresponding to the weight of the car 10 in a state where about half of the passengers are on board.

  During the power running period of the main motor 8, the inverter 4 converts the direct current rectified by the rectifier 2 into alternating current and supplies the alternating current to the main motor 8. On the other hand, during the regenerative operation period of the main motor 8, the regenerative power of the main motor 8 is converted into direct current by the bridge circuit of the diode 6 of the inverter 4, output to the rectifier 2 side, and stored in the smoothing capacitor 3. A series circuit of a resistor 14 and a switching element 15 is connected to the end of the inverter 4 on the rectifier 2 side. A voltmeter 16 is connected to both ends of the smoothing capacitor 3.

In regenerative operation period of the main motor 8, due to the regenerative power supplied from the inverter 4, since the terminal voltage Vc of the smoothing capacitor 3 is increased, significantly higher values for the capacitor voltage Vc and the reference voltage V _R When the energy discharge voltage V _HS set to 1 is exceeded, for the purpose of protecting each circuit element from a high voltage, the energy discharge control unit 17 is activated, the switching element 15 is closed, and the regeneration accumulated in the smoothing capacitor 3 is performed. Electric power (energy) is consumed by the resistor 14. The reference voltage V _R is a voltage when the main motor 8 is stopped.

  Furthermore, a charge / discharge circuit 19 is connected to the rectifier 2 side end of the inverter 4 to store the regenerative power supplied from the inverter 4 in the battery 18 and supply the stored power to the motor 8 via the inverter 4. Yes. In addition, a charge / discharge control unit 20 that controls the operation of the charge / discharge circuit 19 is provided.

Next, operations of the charge / discharge circuit 19 and the charge / discharge control unit 20 will be described.
In regenerative operation period of the main motor 8, due to the regenerative power supplied from the inverter 4, the terminal voltage (capacitor voltage) Vc rises of the smoothing capacitor 3, the capacitor voltage Vc is higher than the reference voltage V _R When the upper voltage value V _H set to a value lower than the energy release voltage V _HS is exceeded, the charge / discharge control unit 20 turns on the switching element 21 of the charge / discharge circuit 19. Then, the regenerative power supplied from the inverter 4 is accumulated in the battery 18 via the charging reactor 22. A backflow preventing diode 23 is connected to both ends of the charging reactor 22.

During the power running period of the main motor 8, DC power output from the rectifier 2 is supplied to the inverter 4, but due to the load of the inverter 4, the voltage on the rectifier 2 side of the inverter 4, that is, the terminal of the smoothing capacitor 3. the voltage (capacitor voltage) Vc temporarily lower than the reference voltage V _R. When the capacitor voltage Vc falls below the lower voltage value V _L set to a value lower than the reference voltage V _R , the charge / discharge control unit 20 turns on the switching element 24 of the charge / discharge circuit 19. Then, a closed circuit of the battery 18, the discharge reactor 25, and the switching element 24 is formed, and a discharge current flows through this closed circuit. Therefore, when the switching element 24 is turned off, the electric power (energy) stored in the discharge reactor 25 is supplied to the rectifier 2 side terminal of the inverter 4 via the diode 26. Thus, by repeatedly turning on and off the switching element 24, the electric power stored in the battery 18 can be supplied to the motor 8 via the inverter 4.

Thus, by providing the battery 18, the charging / discharging circuit 19, and the charging / discharging control unit 20 in the elevator control device, the peak value of the power supplied from the outside is reduced, and the power consumption is reduced. The required power capacity of the elevator control device can be reduced.
Japanese Patent Laid-Open No. 10-236743

  However, the elevator control apparatus shown in FIG. 3 still has the following problems to be improved.

That is, in the lift type elevator shown in FIG. 3, as described above, the counterweight 12 is an indispensable member for reducing the load of the main motor 8 by balancing the weight with the car 10 and reducing the load of the main motor 8. The space in which the counterweight 12 moves up and down is also virtually useless.
Moreover, in an elevator control apparatus, it is calculated | required to reduce a required power capacity further.

  The present invention has been made in view of such circumstances, and by attaching a sub motor to the sub sheave in the vicinity of the counterweight, during the regenerative operation of the elevator, the sub motor is regenerated to accumulate regenerative power, To provide an elevator control device that can supply the electric power accumulated during the power running operation of the elevator to the sub motor and can further reduce the required power capacity of the control device without increasing the required space of the elevator. Objective.

In order to solve the above problems, in the present invention, alternating current from an external power source is converted into direct current with a rectifier, the converted direct current is converted into alternating current with an inverter, and the converted alternating current is balanced with the elevator car. In an elevator control device that moves a car up and down to a target floor by supplying a weight to a main motor that rotates a main sheave among a plurality of sheaves that are supported to move up and down via a rope.
Of the multiple sheaves, the auxiliary motor attached to the auxiliary sheave provided in the vicinity of the counterweight, and the regenerative power of the auxiliary motor is converted to direct current during the regenerative operation of the auxiliary motor, and the direct current supplied during the power running operation of the auxiliary motor A sub inverter that converts electric power into alternating current and supplies it to the sub motor, and stores the regenerative power output from the sub inverter during the regenerative operation of the sub motor, and stores the accumulated power via the sub inverter during the power running operation of the sub motor. A power storage device supplied to the sub-motor, and an operation control unit that controls the regenerative operation of the sub-motor during the regenerative operation of the elevator and controls the power running operation of the sub-motor during the regenerative operation of the elevator.

  In the elevator control apparatus configured as described above, the main motor that rotates the main sheave among the plurality of sheaves that support the elevator car and the counterweight so as to be movable up and down via the rope, and the counterweight among the plurality of sheaves. There are two motors, a secondary motor attached to a secondary sheave provided near the motor.

  During the regenerative operation of the elevator, the regenerative power of the sub motor is stored in the power storage device via the sub inverter. During powering operation of the elevator, power is supplied to the main motor that rotates the main sheave from an external power source via a rectifier and an inverter, and the sub motor that rotates the sub sheave is connected to the sub motor from the power storage device via the sub inverter. Power is supplied.

  In other words, during the power running operation of the elevator, the car is moved up and down by the main motor and the sub motor. However, since the sub motor uses the accumulated power, the consumption of the main motor supplied with power from the external power source is used. The amount of power is suppressed.

  Further, since the auxiliary motor can be provided in the space where the counterweight moves up and down, the required space for the elevator is not increased.

  In another aspect of the invention, the elevator control device according to the invention further includes a rotation synchronization circuit that synchronizes the rotation speed of the main motor and the rotation speed of the sub motor.

  In the elevator control apparatus configured as described above, a secondary motor is attached to a secondary sheep in the vicinity of the counterweight, and during the regenerative operation of the elevator, the secondary motor is regeneratively operated to accumulate regenerative power. The accumulated power is supplied to the sub motor. Therefore, the power consumption of the main motor to which power is supplied from the external power source is suppressed without increasing the required space for the elevator, and the required power capacity of the elevator control device can be further reduced.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of an elevator control apparatus according to an embodiment of the present invention. The same parts as those of the conventional elevator control apparatus shown in FIG.

  In the elevator control device of this embodiment, the three-phase alternating current supplied from the external power source 1 is full-wave rectified by the rectifier 2, the ripple is absorbed by the smoothing capacitor 3, and supplied to the inverter 4. The inverter 4 converts the direct current smoothed by the smoothing capacitor 3 into a three-phase alternating current based on the gate signal from the operation control unit 7 and supplies it to the main motor 8. The rope 13 having both ends fixed to the ceiling of the top floor of the building includes a car sheave 10a, 10b to which the car 10 is attached, a main sheave 9 to which the main motor 8 is attached, and a counterweight (C / W) 12. It is hung on the attached secondary sheave 11.

  The operation control unit 7 controls the operation of the main motor 8 via the inverter 4 in accordance with the car call operation of the elevator passenger, and moves the car 10 up and down to the destination floor. The configuration and operation of the energy release control unit 17, the charge / discharge circuit 19, and the charge / discharge control unit 20 are the same as the energy release control unit 17, the battery 18, the charge / discharge circuit 19, and the charge / discharge of the conventional elevator control device shown in FIG. The configuration and operation of the control unit 20 are the same.

  In the elevator control device of this embodiment, the auxiliary motor 30 is attached to the rotation shaft of the auxiliary sheep 11 to which the counterweight 12 is attached. The auxiliary motor 30 can be operated as a power source as an original electric motor (motor) and can be regenerated as a generator. A sub inverter 31 is connected to the sub motor 30. The sub-inverter 31 has the same configuration as the inverter 4 of the main motor 8, converts the regenerative power of the sub-motor 30 into direct current during the regenerative operation of the sub-motor 30, and charges / discharges a circuit 33 via a smoothing capacitor 32. When the secondary motor 30 is in a power running operation, the DC power supplied from the charge / discharge circuit 33 is converted to alternating current and supplied to the secondary motor 30.

  The charge / discharge circuit 33 has the same configuration as the charge / discharge circuit 19, and accumulates the regenerative power output from the sub inverter 31 in the capacitor 34 and stores it in the capacitor 34 based on an instruction from the operation control unit 36. The generated power is supplied to the sub motor 30 via the sub inverter 31. The charging current and discharging current for the battery 34 are detected by the current detection circuit 35 and transmitted to the operation control unit 36. The terminal voltage of the battery 34 is detected by the voltage detection circuit 37 and transmitted to the operation control unit 36.

  The car 10 is provided with a weigh scale 38 that measures the weight of the car in which a passenger is on board, and the measured car weight is transmitted to the power running regeneration determination unit 39. The power running regeneration determination unit 39 uses the magnitude comparison result of the weight of the car and the stored weight of the counterweight 12 and the vertical movement direction of the car 10, and the elevator (main motor 8) performs power running based on the algorithm described above. The operation state or the regenerative operation state is determined, and the determination result is transmitted to the operation control unit 36.

  Further, the operation control unit 7 for the main motor 8 described above reads the rotation speed of the main motor 8 from the rotation speed detector 41 and sends it to the rotation synchronization circuit 40. The rotation synchronization circuit 40 reads the rotation speed of the sub motor 30 from the rotation speed detector 42, and the sub motor 30 is connected via the sub inverter 31 so that the rotation speed of the sub motor 30 matches the rotation speed of the main motor 8. To control.

  As another method for synchronizing the rotation speed of the main motor 8 and the rotation speed of the sub motor 30, a one-way bearing (a bearing that is driven only in one direction, rotation in the opposite direction is free) is used. There is a mechanical method in which the secondary sheave 11 of the counterweight 12 is rotated by the main motor 8 until the rotation speed is synchronized. In this one-way bearing method, the synchronous control is simplified by utilizing the fact that the direction of the force is reversed and the traction is applied only when the driving force is applied from the auxiliary motor 30 synchronously.

  The operation control unit 36 takes in the charging and discharging currents of the battery 34 detected by the current detection circuit 35, the terminal voltage of the battery 34 detected by the voltage detection circuit 37, and multiplies the terminal voltage by the charging / discharging current. The power is the power charged / discharged in the battery 34 at this time, and the accumulated value from the reference time at which this power can be regarded as the past accumulated amount = 0 is the accumulated amount at the current time. As described above, the operation control unit 36 also has a function of calculating the accumulation amount of the battery 34 at the current time point.

  The sub motor 30, the smoothing capacitor 32, the rotation speed detector 42, the sub inverter 31, the charge / discharge circuit 33, the capacitor 34, the circuits 35, 37, and 40, and the units 36 and 39 are a part of the counterweight 12. Is incorporated into the counterweight 12.

  Then, the operation control unit 36 controls the charge / discharge circuit 33 according to the flowchart shown in FIG. 2 and also controls the sub motor 30 via the sub inverter 31.

  Based on the information from the power regeneration determination unit 39, the current operating state of the elevator (main motor 8) is determined. When the operation state is power running operation (step S1), it is checked whether or not the amount of electric power stored in the battery 34 is 60% or more of the maximum storage capacity of the battery 34. When the accumulation amount is 60% or more of the maximum accumulation capacity (S2), the charging / discharging circuit 33 is controlled and the auxiliary motor 30 is activated as a motor (electric motor) via the auxiliary inverter 31 (S3).

  The rotation synchronization circuit 40 is activated to detect the rotation speed of the main motor 8 (S4), and the rotation speed of the main motor 8 and the rotation speed of the sub motor 30 are synchronized. Specifically, the rotation speed of the sub motor 30 is matched with the rotation speed of the main motor 8 (S5).

  Next, the charge / discharge circuit 33 is controlled to supply the electric power stored in the battery 34 to the sub motor 30 in the power running state via the sub inverter 31 (S6). As a result, the accumulated amount of power in the battery 34 starts to decrease. At the same time, the accumulated amount of power in the capacitor 34 is checked. If the accumulated amount is 60% or more of the maximum accumulated capacity (S7), the power supply to the sub motor 30 is performed. Continue.

  When the storage amount decreases to less than 60% of the maximum storage capacity (S7), the charge / discharge circuit 33 is controlled and the control of the sub motor 30 as a motor (electric motor) is stopped via the sub inverter 31 (S8). Thereafter, the sub motor 30 is rotated freely (S9).

  When the current operation state of the elevator (main motor 8) is a power running operation (S1) and the accumulated amount of electric power in the battery 34 is less than 60% of the maximum accumulated capacity (S2), the sub motor 30 is freely rotated. (S9).

  When the current operation state of the elevator (main motor 8) is not the power running operation (S1) and the regenerative operation is performed, it is checked whether or not the accumulated amount of electric power in the capacitor 34 is 70% or less of the maximum accumulated capacity of the capacitor 34. When the storage amount is 70% or less of the maximum storage capacity (S10), the charge / discharge circuit 33 is controlled and the sub motor 30 is started as a generator via the sub inverter 31 (S11).

  The rotation synchronization circuit 40 is activated to detect the rotation speed of the main motor 8 (S12), and the rotation speed of the main motor 8 and the rotation speed of the sub motor 30 are synchronized. Specifically, the rotation speed of the sub motor 30 is matched with the rotation speed of the main motor 8 (S13).

  Next, the charging / discharging circuit 33 is controlled, and the regenerative power output from the sub motor 30 through the sub inverter 31 is stored in the battery 34 (14). As a result, the accumulated amount of electric power in the battery 34 starts to rise. At the same time, the accumulated amount of electric power in the battery 34 is checked. If the accumulated amount is 70% or less of the maximum accumulated capacity (S15), continue.

  When the storage amount exceeds 70% of the maximum storage capacity (S16), the charge / discharge circuit 33 is controlled and the control of the sub motor 30 as a generator is stopped via the sub inverter 31 (S17). The sub motor 30 is freely rotated (S17).

  When the current operation state of the elevator (main motor 8) is a regenerative operation (S1) and the accumulated amount of electric power in the capacitor 34 exceeds 70% of the maximum accumulated capacity (S10), the sub motor 30 is freely rotated. (S17).

  In the elevator control apparatus configured as described above, the main sheave 9 is rotated among the plurality of sheaves 10 a, 10 b, 9, 11 that support the elevator car 10 and the counterweight 12 movably up and down via the rope 13. In addition to the main motor 8, the auxiliary motor 30 attached to the auxiliary sheave 11 to which the counterweight 12 is attached is provided.

  During the regenerative operation of the elevator (main motor 8), the sub motor 30 can also perform the regenerative operation. Therefore, the regenerative power of the sub motor 30 is accumulated in the battery 34 via the sub inverter 31. In this case, when the electric power is stored up to 70% of the maximum storage capacity of the battery 34, the sub motor 30 stops the function of the generator and freely rotates.

  During the power running operation of the elevator (main motor 8), electric power is supplied from the external power source 1 through the rectifier 2 and the inverter 4 to the main motor 8 that rotates the main sheave 9. Further, power is supplied from the battery 34 via the sub inverter 31 to the sub motor 30 that rotates the sub sheave 11. When the storage amount of the battery 34 is reduced to 60% of the maximum storage capacity of the battery 34, the sub motor 30 stops the function of the motor (electric motor) and freely rotates.

  Thus, during the power running operation of the elevator (main motor 8), the car 10 is moved up and down by the main motor 8 and the sub motor 30, but the sub motor 30 uses the electric power stored in the battery 34. Therefore, the power consumption of the main motor 8 to which power is supplied from the external power source 1 is suppressed. As a result, the required power capacity of the elevator control device can be further reduced.

  In addition, during the power running operation and the regenerative operation of the sub motor 30, the rotation speed of the sub motor 30 is synchronized with the rotation speed of the main motor 8, so that the rope 13 is loosened or excessive tension is applied to the rope 13. It will never be done.

  The sub motor 30, the smoothing capacitor 32, the rotation detector 42, the sub inverter 31, the charge / discharge circuit 33, the capacitor 34, the circuits 35, 37, 40, and the units 36, 39 are part of the counterweight 12. It is incorporated in the counterweight 12. As described above, the auxiliary motor 30 is provided in the space where the counterweight 12 moves up and down as a result, and this does not increase the space required for the elevator.

  Further, even if the main motor 8 or the inverter 4 breaks down and the main motor 8 is in a free rotation state, the car 10 is moved to the nearest floor by the sub motor 30 using the electric power stored in the battery 34. It is possible to move to the first floor (reference floor) at a low speed.

The figure which shows schematic structure of the elevator control apparatus concerning one Embodiment of this invention. The flowchart which shows the control action of the elevator control apparatus of the embodiment The figure which shows schematic structure of the conventional elevator control apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... External power supply, 2 ... Rectifier, 3, 32 ... Smoothing capacitor, 4 ... Inverter, 7, 36 ... Operation control part, 8 ... Main motor, 9 ... Main sheave, 10 ... Car, 11 ... Sub sheave, 12 ... Balance Weight, 13 ... rope, 14 ... resistance, 15, 22, 24 ... switching element, 16 ... voltmeter, 17 ... energy release controller, 18, 34 ... capacitor, 19, 33 ... charge / discharge circuit, 20 ... charge / discharge control , 30 ... sub motor, 31 ... sub inverter, 35 ... current detection circuit, 37 ... voltage detection circuit, 38 ... weight detector, 39 ... power running regeneration determination unit, 40 ... rotation synchronization circuit, 41, 42 ... rotation speed detection vessel

Claims (2)

The AC from the external power source is converted to DC by a rectifier, the converted DC is converted to AC by an inverter, and the converted AC is supported by an elevator car and a counterweight so as to be movable up and down via a rope. In an elevator control device that moves the car up and down to a destination floor by supplying a main motor that rotates a main sheave among a plurality of sheaves,
A sub motor attached to a sub sheave provided in the vicinity of the counterweight among the plurality of sheaves;
A sub-inverter that converts the regenerative power of the sub-motor to direct current during the regenerative operation of the sub-motor, and that converts the supplied direct-current power to alternating current during powering operation of the sub-motor and supplies it to the sub-motor;
A power storage device that stores regenerative power output from a sub-inverter during regenerative operation of the sub-motor, and that supplies power stored in the sub-motor via the sub-inverter during powering operation of the sub-motor,
An elevator control device comprising: an operation control unit that controls the regenerative operation of the sub motor during the regenerative operation of the elevator, and controls the power running operation of the sub motor during the regenerative operation of the elevator.   The elevator control apparatus according to claim 1, further comprising a rotation synchronization circuit that synchronizes the rotation speed of the main motor and the rotation speed of the sub motor.

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