JP2003267639A - Power supply unit of elevator car - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the load on a motor by limiting the power generated by a generator. <P>SOLUTION: The output of the generator 10 to generate the power as a car 7 is moved is converted by a power converter 121, and the converted power is accumulated in a battery 123, and the voltage thereof is converted to the voltage to meet electric appliances in the car 7 by a voltage converter 124, and supplied. The power generated by the generator 10 is converted intermittently, or only when an elevator is started to accelerate or decelerated, and the power is supplied to various kinds of electric appliances in the car 7. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for an elevator car, and more particularly to a power supply device for an elevator car suitable for supplying power to a car driven by an electric motor without cables.

[0002]

2. Description of the Related Art An elevator car is equipped with a door opening / closing device for opening and closing a door, a lighting device for illuminating the inside of the car, an air conditioner for air conditioning the inside of the car, a display for displaying floors, and the like. A variety of required electric devices are installed. When supplying electric power to various electric devices installed in a car, a method of supplying electric power from a control device installed in a building through a power cable called a tail cord is adopted. However, this power cable is repeatedly subjected to bending force as the car moves, and thus is likely to deteriorate. Therefore, it is necessary to regularly inspect and maintain the power cable, and in some cases it is necessary to replace the power cable.

Therefore, as a method of supplying electric power to a car without using such a power cable, for example, as described in Japanese Patent Laid-Open No. 5-294568, power generation is performed according to the moving speed of the car. Generator to
Each car is equipped with a contactless power supply and a storage battery that supplies electric power to the car in a non-contact state on the elevator stop floor.Electric power is supplied to the car by the generator while the elevator is running, and when the elevator is stopped. It has been proposed to supply electric power to a car from a contactless power feeder. In this case, the power generation mechanism by the power generator employs a method in which a drive roller is attached to the power generator and the drive roller is pressed against a rail for guiding the traveling of the car to generate power.

[0004]

In the above prior art, the electric power can be supplied to the car without using the electric power cable, so that the reliability can be improved.

However, since the electric power of the generator is supplied to various devices of the car, the capacity of the elevator driving electric motor and the control device must be increased as compared with the case where the generator is not installed. There is.

That is, the electric power generated by the generator during the traveling of the elevator becomes the load of the electric motor for driving the elevator as it is, and the output electric power of the generator is added to the electric power for driving the car. Therefore, the electric motor for driving the elevator and its control device need to have a large capacity in consideration of the capacity of the generator (generated electric power).

An object of the present invention is to provide a power supply device for an elevator car capable of reducing the load of the electric motor by limiting the electric power generated by the electric generator.

[0008]

In order to solve the above-mentioned problems, the present invention provides a generator for generating power according to the movement of a car driven by an electric motor, and power control means for controlling the output power of the generator. , An electric power supply means for supplying the electric power controlled by the electric power control means to a load in the car, the electric power control means being an elevator car controlled by inputting output power of the generator. The power supply device is configured.

In constructing the power supply device for the elevator car, the power control means may be configured to have the following functions.

(1) The output power of the generator is intermittently input and controlled.

(2) The output power of the generator is input and controlled only at the start of acceleration and only during the deceleration period.

(3) The output of the electric motor for rotating the sheave around which the rope to which the load of the car is added is wound or the output of the electric motor driving means for applying the electric signal to the electric motor to drive the electric motor is fetched. The output power of the generator is input and controlled according to the output of the electric motor or the output of the electric motor driving means.

(4) Taking in the output of an electric motor for rotationally driving a sheave around which a rope to which the load of a car is added is wound or the output of an electric motor driving means for applying an electric signal to the electric motor to drive the electric motor. When the output of the electric motor or the output of the electric motor driving means is within a predetermined value range, the output power of the generator is input and controlled.

In constructing the power supply device for each elevator car, the following elements can be added.

(1) A pulley for guiding the rope is rotatably fixed to a bottom side or an upper side of the car, and both ends of the rope are fixed to positions above the car. In the middle of the above, a roping 2: 1 drive mechanism for arranging the speed of the car to be 1/2 of the rotation speed of the electric motor is arranged.

(2) The generator is directly connected to the rotary shaft of the pulley or built in the pulley.

According to the above-mentioned means, instead of always inputting the output power of the generator to control the output power, the output power of the generator is input to control the output power. Output power can be limited to reduce the load on the electric motor, and increase in the capacity of the car driving electric motor or the electric motor driving means can be suppressed.

Further, the output power of the generator is intermittently input and controlled, or the output power of the generator is input and controlled only at the start of acceleration and during the deceleration period. The output power of the generator is input according to the output of the drive means to control the output power, or the output power of the generator when the output of the electric motor or the output of the electric motor drive means is within a predetermined value range. By controlling the output power by inputting, the output power of the generator is also limited, so the load on the electric motor can be reduced, and the capacity of the electric motor and the electric motor driving means can be suppressed from increasing. can do.

Further, by directly connecting the generator to the rotary shaft of the pulley or by incorporating it in the pulley, parts for connecting the drive roller to the rotary shaft of the generator and pressing the drive roller against the guide rail are provided. It is not necessary to provide it, and the configuration can be simplified.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a system configuration diagram of an elevator system in which the power supply device according to the present invention is used. In FIG. 1, a rail (guide rail) 9 for traveling guidance is installed vertically along the hoistway of the building, and a car 7 driven by an electric motor 3 is vertically movable along the rail 9. There is. A sheave 5 is rotatably arranged above the car 7, and a rope 6 is wound around the sheave 5. One end side of the rope 6 is connected to the upper side of the car 7 and the other end side is connected to the upper side of the counterweight 8. That is, the car 7 and the counterweight 8 are hung from the sheave 5 via the rope 6 in a slippery shape. The rotating shaft of the sheave 5 is connected to the rotating shaft of the electric motor 3, and the sheave 5 rotates in the forward or reverse direction as the electric motor 3 rotates in the normal direction or in the reverse direction. The car 7 moves up and down along the rail 9 in conjunction with the rotation.

The electric motor 3 is composed of, for example, an AC electric motor, and the AC input side of the electric motor 3 is connected to the commercial power supply 1 via the inverter device 2. Inverter device 2
Is configured to convert an AC output from the commercial power supply 1 into an AC electric signal having a variable voltage and a variable frequency and apply the electric signal to the electric motor 3 to control the rotation speed of the electric motor 3. In this case, the inverter device 2 generates a torque command according to the deviation between the detected speed ω of the speed detector 4 that detects the rotation speed of the electric motor 3 and the speed command, and an electric signal of voltage / current according to the torque command. Is output to the electric motor 3.

On the other hand, the car 7 requires electric power such as a door opening / closing device for opening and closing the door, a lighting device for illuminating the inside of the car, an air conditioner for air conditioning the inside of the car, and a display for displaying the floor. And electrical equipment is installed. When supplying electric power to various electric devices mounted on the car 7 without a cable, a generator 10 and a power supply control device 12 are installed in this embodiment.

The generator 10 is fixed to the upper side of the car 7, and the rotating shaft of the generator 10 is connected to the driving roller 11. The drive roller 11 is fixed to the rotating shaft while being pressed against the rail 9. Therefore, as the car 7 moves up and down, the drive roller 11 rotates, the generator 10 generates power, and the generated power of the generator 10 is output to the power supply control device 12.

The power supply controller 12 includes a power converter 12
1, power controller 122, capacitor 123, voltage converter 12
4, a non-contact power feeder 125, a current detector 126, and a voltage detector 127.

When the generator 10 is composed of an AC output type generator, the power converter 121 can convert the AC power generated by the output of the generator 10 into DC power and control the output power. It is composed of an inverter including a control element (switching element). Further, the power converter 121, when the generator 10 is composed of a DC output type generator, converts the DC power output from the generator 10 into DC power and controls the output power. It is composed of a chopper composed of a control element capable of When the power converter 121 is composed of an inverter or a chopper, the converted output of the inverter or the chopper is controlled according to the switching signal from the power controller 122.

The power controller 122 controls the output Pm of the electric motor 3.
(T) and the output of the inverter 2 are wirelessly input, and the detection current Ic of the current detector 126 that detects the output current of the power converter 121 and the detection of the voltage detector 127 that detects the output voltage of the power converter 121 are detected. The voltage Vc is input, a switching signal for limiting the output power of the generator 10 is generated based on the input signal, and the generated switching signal is output to the control element of the power converter 121. . That is, the power converter 121 and the power controller 122 intermittently input the generated power of the generator 10 and constantly control the output power thereof, in order to limit the generated power of the generator 10, without constantly inputting the generated power of the generator 10. It is configured as power control means. In this case, as will be described later, the output power of the generator 10 is input to control the output power only at the start of acceleration of the elevator and the deceleration time, and the output of the electric motor 3 and the output of the inverter device (electric motor driving means) 2 are output. Alternatively, the output power of the generator 10 is input according to the power generated by multiplying the detection current Ic of the current detector 126 and the detection voltage Vc of the voltage detector 127 to control the output power, or the output of the electric motor 3, Output of inverter 2 or Ic x Vc
The output power of the generator 10 can be input and the output power can be controlled only when the calculated value (power) of is within the range of the predetermined value.

The output of the power converter 121 is stored in the power storage device 123, and the power from the non-contact power feeder 125 is stored in the power storage device 123. As the battery 123, a secondary battery or a capacitor with a large capacity (such as an electric double layer capacitor) can be used.

The contactless power feeder 125 comprises, for example, a secondary winding of a high frequency transformer and a converter for converting the induced voltage induced in the secondary winding into DC power. The secondary winding of the high frequency transformer is connected to the primary winding of the high frequency winding installed on the stop floor in a non-contact state when the elevator stops at the stop floor, It is designed to receive power.

The electric power stored in the battery 123 is input to the voltage converter 124, and the voltage converter 124 outputs a voltage suitable for the door opening / closing device, the illuminator, the display, and the like. That is, the non-contact power feeder 125, the storage device 123, and the voltage converter 124 are configured as a power supply unit that supplies power to the load in the car.

In the above configuration, when a speed command is given to the inverter device 2, as shown in FIG. 2, the rotation speed of the electric motor 3 is adjusted so that the speed command coincides with the rotation speed ω detected by the speed detector 4. The car 7 is controlled and the car 7 is moved up or down as the electric motor 3 is rotationally driven. In the process of raising or lowering the car 7, the generator 10
When no limitation is applied to the power generated by
As shown in (a), the generated power Pg (t) of the generator 10
Is always converted by the power converter 121, and then the battery 123
Will be accumulated in.

Here, when the car 7 is in the rated loading state,
The output of the electric motor 3 when the ascending operation is performed at the rotation speed ω is P
m (t), Pg (t) is the electric power generated by the generator 10 while the elevator is running, and Pg (t) is the electric power of the generator 10.
Is generated in proportion to the speed ω of the elevator, the generated power Pg (t) of the generator 10 becomes the load of the electric motor 3 as it is, and is added to the electric power for driving the car 7.

That is, as shown in FIG. 2A, the output Pm of the electric motor 3 when there is no electric power generated by the electric generator 10.
While (t) is Pm1 (t) as shown by the dotted line, when the generated power of the generator 10 is constantly converted by the power converter 121, the electric motor 3 is shown as shown by the solid line.
Power Pg (t) of the generator 10 to the output Pm1 (t) of
Is added, and the electric power required for the electric motor 3 is Pm2 (t)
Becomes

Here, the rated capacity of the electric motor 3 is normally determined from the output when the rated load is carried on the car 7 and the vehicle is traveling at the rated speed, and the capacity of the inverter device 2 is the acceleration end of the electric motor 3. It is set to the capacity (current capacity) commensurate with the maximum output.

Considering the rated capacity of the electric motor 3 and the capacity of the inverter device 2, if the electric power generated by the generator 10 is constantly converted by the power converter 121, the capacity of the inverter device 2 is increased during the acceleration period (timing 0 to t1) of the elevator. Beyond
The rated output of the electric motor 3 is exceeded during constant speed traveling (the period from timing t2 to t3). Therefore, the electric motor 3 needs to have a large capacity that exceeds the generated electric power, and the inverter device 2 also needs to have the capacity necessary to supplement the current capacity during the acceleration period.

Therefore, in the present embodiment, FIG.
As shown in (b), the electric power generated by the generator 10 is limited according to the output of the electric motor 3.

Specifically, the rated output Pmr of the electric motor 3
*, And when the instantaneous power Pm (t) of the electric motor 3 is set, the generated power of the generator 10 is set to the power converter 121 only when the generated power Pg (t) of the generator 10 satisfies the following expression (1). It is supposed to be converted and stored in the battery 123.

Pgmax ≧ Pg (t) = | Pmr * −Pm (t) | (1) where Pgmax is the maximum power that the generator 10 can generate.

The power that can be generated by the generator 10 in the example shown in FIG. 2B is such that the output Pm1 (t) of the electric motor 3 is within a predetermined range, for example, below the rated output Pmr *.

When the electric power generated by the generator 10 is limited so as to satisfy the equation (1), the generator 10 starts acceleration (timing 0 to 0.5t1) during the elevator acceleration period (timing 0 to t1). And the deceleration period (from timing t3
Power will be generated only at t4).

When the generated electric power Pg (t) of the generator 10 is converted by the electric power converter 121 only at the start of acceleration of the elevator and during the deceleration period, the output of the electric motor 3 is as shown by the solid line in FIG. 2 (b). Pm3 (t) is reached, and the acceleration period (timing 0 to t1) and the constant traveling period (timing t2 to t).
In 3), the output Pm1 when there is no generator 10
It is almost the same as (t).

Therefore, it is possible to generate power within the capacity of the electric motor 3 or the capacity of the inverter device 2 which is normally set when the generator 10 is not present.

When limiting the electric power generated by the generator 10, the output Pm (t) of the electric motor 3 is obtained by multiplying the rotational speed of the electric motor 3 by the torque calculated by the inverter device 2, and these values are obtained. Is wirelessly input to the power controller 122. Further, the generated electric power is obtained by the calculation of Ic × Vc, and this generated electric power has a preset value P.
By generating a switching signal for not exceeding gmax by the power controller 122, the power generated by the generator 10 can be limited.

As described above, according to the present embodiment, since the electric power generated by the generator 10 is limited only at the start of acceleration and the deceleration period of the elevator, the electric power can be generated without increasing the capacity of the electric motor 3 and the inverter device 2. Therefore, the electric power generated by the generator 10 can be supplied to various electric devices of the car 7 without a cable.

When limiting the electric power generated by the generator 10, a method of taking in the electric power generated by the generator 10 and converting the electric power only during the period (timing t3 to t4) during which the electric motor 3 is in the regenerative operation is used. It can also be adopted. That is, when the electric motor 3 is regeneratively operated, a method of consuming electric power generated by this regeneration by a resistor is usually adopted. However, by supplying the electric power at the time of regeneration to the equipment in the car, energy saving can be achieved. Can be planned.

Next, another embodiment of the present invention will be described with reference to FIG. In this embodiment, the elevator car 7
Among the driving methods in which the speed is 1/2 (rotating 2: 1) with respect to the rotation speed of the electric motor 3, the underslag type is used.

In the under slug type, instead of the car 7 moving along the rail 9, pulleys 131 and 132 serving as moving pulleys are fixed to the bottom side of the car 7, and both ends of the rope 6 are lifted. It is fixed to a support plate 170 arranged above the hoistway. In the middle of the rope 6, a driving mechanism of roping 2: 1 in which the speed of the car 7 is 1/2 of the rotation speed ω of the electric motor 3 is arranged.

That is, the pulleys 133 and 134 are fixed to the support plate 130, and the pulley 135 is attached to the counterweight 8.
Is fixed, and the sheave 5 is arranged between the pulley 133 and the pulley 134. One end of the rope 6 wound around the sheave 5 is fixed to the support plate 130 via pulleys 133, 132, 131, and the other end of the loop 6 wound around the sheave 5 is passed through pulleys 134, 135. It is fixed to the support plate 130. The rotating shaft of the generator 10 is directly connected to the rotating shaft of the pulley 131. It is also possible to adopt a configuration in which the generator 10 is built in the pulley 131 and integrated with the pulley 131.

In this embodiment, the inverter device 2
When a speed command is given to the electric motor 3 and the electric motor 3 is rotationally driven, the sheave 5 rotates, the rope 6 moves with the rotation of the sheave 5, and the pulleys 131, 132, 13
3, 134, 135 rotate, and the car 7 is driven up or down.

In this embodiment, the pulleys 131 and 132 fixed to the bottom side of the car 7 have been described.
A method of fixing the pulleys 131 and 132 to the upper side of the car 7 can also be adopted.

Also in the present embodiment, since the electric power generated by the generator 10 is limited by using the electric power supply control device 12, the electric power is generated by the generator 10 without increasing the capacity of the electric motor 3 and the inverter device 2. The power generated by the generator 10 can be supplied to various devices of the car 7 without a cable.

Further, since the generator 10 is directly connected to the rotary shaft of the pulley 131, the drive roller 11 and the parts for pressing the drive roller 11 to the rail 9 are not needed unlike the case where the drive roller 11 is used, and the power generation is eliminated. The mechanism for mounting the machine 10 can be simplified.

[0052]

As described above, according to the present invention, since the output power of the generator is input and the output power is controlled, the output power of the generator is limited and the load of the motor is reduced. It is possible to reduce the capacity, and it is possible to suppress an increase in the capacity of the car driving electric motor or the electric motor driving means.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an elevator system using a power supply device according to an embodiment of the present invention.

2A is a characteristic diagram when the electric power of the generator is not limited, and FIG. 2B is a characteristic diagram when the electric power of the generator is limited.

FIG. 3 (a) is an overall configuration diagram of an elevator system showing another embodiment of the present invention, and FIG. 3 (b) is a front view showing a relationship between a car and a generator.

[Explanation of symbols]

2 Inverter device 3 electric motor 4 speed detector 5 sheaves 6 rope 7 car 8 counterweight 9 rails 10 generator 11 Drive roller 12 Power supply control device 121 power converter 122 Power controller 123 Battery 124 Voltage converter 125 non-contact power feeder 126 Current detector 127 voltage detector

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shunsuke Mine             1070 Ichimo, Hitachinaka City, Ibaraki Prefecture Stock Association             Hitachi Building Co., Ltd. Mito Bi             Le System Headquarters (72) Inventor Atsuya Fujino             1070 Ichimo, Hitachinaka City, Ibaraki Prefecture Stock Association             Hitachi Building Co., Ltd. Mito Bi             Le System Headquarters (72) Inventor Hiroshi Nagase             1070 Ichimo, Hitachinaka City, Ibaraki Prefecture Stock Association             Hitachi Building Co., Ltd. Mito Bi             Le System Headquarters F-term (reference) 3F002 CA06 DA08 GA03 GB02                 3F306 BB01 CB06 CB60

Claims (6)

[Claims] 1. A generator driven by an electric motor to generate power in accordance with movement of a car, power control means for controlling output power of the generator, and power controlled by the power control means for a load in the car. And a power supply means for supplying power to the electric power supply device for the elevator car, wherein the power control means inputs and controls the output power of the generator. 2. A generator driven by an electric motor to generate power in accordance with movement of a car, power control means for controlling output power of the generator, and power controlled by the power control means for a load in the car. Power supply means for supplying electric power to the electric power supply device for the elevator car, wherein the electric power control means inputs and controls the output electric power of the generator only during acceleration start and deceleration period. 3. A generator for generating power according to movement of a car, and power control means for controlling output power of the generator,
A power supply means for supplying the electric power controlled by the power control means to a load in the car, wherein the power control means rotationally drives the sheave around which the rope to which the load of the car is added is wound. The output of the electric motor or the output of the electric motor driving means for driving the electric motor by applying an electric signal to the electric motor is taken in, and the output power of the generator is input according to the output of the electric motor or the output of the electric motor driving means. The power supply device for the elevator car that is controlled. 4. A generator for generating power according to movement of a car, and power control means for controlling output power of the generator,
A power supply means for supplying the electric power controlled by the power control means to a load in the car, wherein the power control means rotationally drives the sheave around which the rope to which the load of the car is added is wound. When the output of the electric motor or the output of the electric motor driving means for applying the electric signal to the electric motor to drive the electric motor is taken in, and the output of the electric motor or the output of the electric motor driving means is within a predetermined value, the generator Elevator car power supply device controlled by inputting the output power of the car. 5. The elevator car electric power supply apparatus according to claim 1, further comprising a pulley for guiding the rope on a bottom side or an upper side of the car. The rope is rotatably fixed, and both ends of the rope are fixed at positions above the car, and the speed of the car becomes half of the rotation speed of the electric motor in the middle of the rope. A power supply device for an elevator car, comprising a roping 2-to-1 drive mechanism. 6. The electric power supply device for an elevator car according to claim 5, wherein the generator is directly connected to a rotary shaft of the pulley or built in the pulley. Supply device.