Control devices for passenger transport systems

Abstract

The present invention relates to an electric control device (23) for controlling a drive of a passenger transport system (1) that can be switched between load operation and idle operation, the electric control device (23) comprising at least a three-phase supply voltage connection (31), a frequency converter (33) and a controllable switching device (35). The switching device can couple three phases (U2, V2, W2) of a drive motor (25) to three phases (R, S, T) of the supply voltage connection (31) in a load operation switching state (B2) and to three phases (U1, V1, W1) of the frequency converter (33) in an idle operation switching state (B1), so that the drive motor (25) is connected to the three-phase supply voltage (U1, V1, W1) in the load operation switching state (B2). N ) is supplied, and in the idle operation switching state (B1), the three-phase output voltage (U AC1 , U AC2 , U AC3 In this case, the frequency converter (33) is supplied via at least one phase (R, S, T) of the three-phase supply voltage connection (31) and the neutral (N) of the supply voltage connection (31).

Description

[Technical Field]

[0001] The present invention relates to a control device, a passenger transport system designed as an escalator or moving walkway, a method for controlling the drive unit of the passenger transport system, the system being switchable between load operation and idle operation. The passenger transport system comprises a power supply voltage connection unit that supplies a three-phase power supply voltage, an electric drive motor in particular in the form of a three-phase induction motor or a synchronous motor, and a frequency converter. [Background technology]

[0002] A typical passenger transport system for carrying passengers, taking the form of an escalator or moving walkway, comprises multiple closely spaced step plates, which are connected to each other to form an endless conveyor belt, and are moved in the desired transport direction by a drive motor.

[0003] To reduce the energy consumption and wear of such passenger transport systems, it is customary to set them to transport motion only when transport is required, and to keep them stopped otherwise. Alternatively, or additionally, passenger transport systems can also be set to a mode known as crawl when transport is not required. In this case, the speed of the conveyor belt is significantly reduced, which saves energy on the one hand and indicates the operational readiness and intended transport direction of the passenger transport system to approaching users on the other hand.

[0004] To detect transport requirements, transport requirement signal transmitters can be provided, for example, in the form of step mats, light barriers, or radar sensors located upstream in the transport direction of the passenger transport system. For example, if a transport requirement exists because a passenger is detected by a radar sensor, the passenger transport system is set to transport motion for a predetermined period and switched off again if no further transport needs are determined within that period.

[0005] From International Publication No. 98 / 18711, it is known that, rather than abruptly switching the drive motor on and off to avoid peak loads during frequent switching on and switching off of passenger transport systems, the speed of the drive motor is increased or decreased in a ramp-like manner during the switching operation. Induction motors are mainly used in such passenger transport systems. The speed of an induction motor depends on the frequency of the AC voltage supplying it, which means that the speed of an induction motor is constant when it is powered directly from an AC voltage network having a constant power supply frequency. Therefore, a controllable frequency converter is used so that the power supply frequency supplied to the induction motor can be converted to an output frequency different from the power supply frequency.

[0006] The cost of frequency converters that supply power to the drive motors of escalators or moving walkways is high, even during load operation, because the cost of the frequency converter increases exponentially along with the output power that the frequency converter must be able to deliver.

[0007] In order to keep the acquisition cost and the operation cost low, in WO 98 / 18711, the passenger transportation system is driven at the maximum conveyance speed only during the load operation. During the standby operation or the idle operation, when there is no transportation requirement, the passenger transportation system is assumed to operate only at a reduced idle operation speed. In this case, the drive motor is supplied from the frequency converter only during the idle operation and during the switching process, but is directly supplied from the power voltage source during the load operation. This results in the possibility of designing the frequency converter somewhat lower with respect to its maximum output, which leads to a considerable cost saving compared to a frequency converter whose maximum output is adapted to the load operation of the passenger transportation system. The passenger transportation system known from WO 98 / 18711 thus enters the idle operation when no further transportation requirement is reported after the transportation requirement has been executed, and switches to stop only if no new transportation requirement is reported for a predetermined period after the transition to the idle operation. However, such an electric control device is still very expensive, and the degree of efficiency during the idle operation is also very poor, so a lot of electric energy is wasted without any benefit in this case.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0009] In contrast, the object of the present invention is, in particular, to propose an electric control device that operates in a more cost-effective manner, in particular in a more energy-efficient manner during the idle operation.

Means for Solving the Problems

[0010] This object is achieved by an electric control device used to control the drive unit of a passenger transportation system that can be switched between a load operation and an idle operation. The passenger transportation system is designed as an escalator or a moving walkway and has a three-phase drive motor. The electric control device has at least: - A three-phase power supply voltage connection used to supply a three-phase power supply voltage; - A frequency converter that can be controlled at least with respect to the frequency of its three-phase output voltage; - A controllable switching device that can be switched between a load operation switching state and an idling operation switching state and includes that the three phases of the drive motor are coupled to the three phases of the power supply voltage connection in the load operation switching state, and the three phases of the drive motor are connected to the three phases of the frequency converter in the idling operation switching state. As a result, the drive motor is supplied with a three-phase power supply voltage during the load operation and with a three-phase output voltage of the frequency converter during the idling operation.

[0011] According to the present invention, the frequency converter is supplied via at least one phase of the three-phase power supply voltage connection and the neutral wire of the power supply voltage connection. This design is a departure from the general principle that the frequency converter must have the same maximum three-phase output voltage as the three-phase power supply voltage connection. Investigations have shown that in the idle operation switching state, the output power or output voltage of the frequency converter is sufficient to bring an unoccupied conveyor belt to the desired nominal speed in a sufficiently short time. Once this is achieved, the switching device can be used to switch from the idle operation switching state to the load operation switching state in order to supply the drive motor with enough energy to transport users without loss of speed. Even if a small number of users have already reached and boarded the conveyor belt, the switching is still possible because the inertia of the moving conveyor belt and the kinematic transmission chain between the drive motor and the conveyor belt is so large that any braking of the conveyor belt during the switching process is not noticeable. A major advantage of this deviation is that, on the one hand, the supply voltage between one phase and the neutral wire is lower than the supply voltage present between the three phases of the power supply voltage connection, allowing the dimensions of the frequency converter components to be much smaller. As a result, the production cost of the control device can be kept significantly lower. A further advantage is that the smaller dimensions of the frequency converter mean that the components of the frequency converter are better utilized, and as a result, the efficiency of the frequency converter has been found to be significantly higher compared to conventional designs with phase voltage / phase supply voltage. Consequently, considerable electrical energy can be saved during frequent operation in idle switching conditions.

[0012] In other words, the frequency converter supply voltage is applied and supplied to the frequency converter, and this supply voltage is 1 / √3 times, or 1 / 1.73 times, the three-phase power supply voltage.

[0013] Therefore, with a three-phase power supply voltage three times 400 volts, the frequency converter supply voltage is 230 volts due to the phase / neutral wire connection, and correspondingly, the three-phase output voltage of the frequency converter can be varied within a range of 0 to 230 volts three times. Therefore, with a three-phase power supply voltage three times 380 volts, the frequency converter supply voltage is 220 volts, and correspondingly, the three-phase output voltage of the frequency converter can be varied within a range of 0 to 220 volts three times.

[0014] In one embodiment of the present invention, the frequency converter may have a rectifier module having a diode bridge circuit, the rectifier module being connected at its input side to the phase and neutral wires of a three-phase power supply voltage connection. If necessary, the DC voltage generated by the rectifier bridge may be smoothed by a capacitor in the DC voltage circuit of the frequency converter.

[0015] In a further embodiment of the present invention, the frequency converter may have a rectifier module having a diode configuration different from that of a bridge circuit. This rectifier module is connected at its input side to each phase of a three-phase power supply voltage connection, and the three phases are brought together via the same reverse-direction diodes to form the positive terminal of the DC voltage circuit of the frequency converter. In this case, the neutral wire forms the negative terminal of the DC voltage circuit.

[0016] In a further embodiment of the present invention, the frequency converter may have a rectifier module having a diode configuration that blocks the passage of current in the opposite direction to that of the above-described embodiment. This rectifier module is also connected at its input side to each phase of the three-phase power supply voltage connection, and the three phases are brought together via the same reverse-direction diodes to form the negative terminal of the DC voltage circuit of the frequency converter. In this case, the neutral wire forms the positive terminal of the DC voltage circuit.

[0017] In a further embodiment of the electrical control device, the controllable switching device can be controlled by a controller of the passenger transport system. In other words, the control of the passenger transport system takes over the entire switching logic. For this purpose, the controller preferably uses status information reported back to the controller from the frequency converter and optionally from the controllable switching device. Such status information may be, for example, the current three-phase output voltage of the frequency converter and / or the current switching state of the controllable switching device. Of course, the switching process of the controllable switching device from an idle switching state to a load switching state can also be performed on a time basis by the controller triggering the switching process in the controllable switching device with a time delay after the frequency converter has been controlled. Alternatively, the controllable switching device may be activated directly by the control module of the frequency converter.

[0018] In a further embodiment, the electrical control device may have a phase-synchronous module. This phase-synchronous module synchronizes the converter frequency of the three-phase output voltage of the frequency converter with the power supply frequency of the three-phase power supply connection, for example, by detecting a zero crossing of the power supply frequency and controlling the IGBT of the frequency converter accordingly, so that the zero crossings and phase positions of the three phases coincide with the corresponding phases of the power supply connection. The phase-synchronous module then triggers the switching process of a controllable switching device in accordance with the synchronized power supply frequency and converter frequency. Of course, the entire logic of the phase-synchronous module can also be implemented in the controller of the passenger transport system.

[0019] A passenger transport system designed as an escalator or moving walkway, having at least a controller, a three-phase drive motor, and an electrical control device of the type described above, requires signal transmission connections between the elements described above. Thus, the controller can be connected to the electrical control device via wired or wireless signal connections, or to a controllable frequency converter and a controllable switching device of the electrical control device.

[0020] To enable the detection of transport requirements, a passenger transport system may have at least one transport requirement signal transmitter. In other words, the passenger transport system has a sensor that can detect the approach or entry of a user. The detected user is interpreted as a transport requirement and transmitted to the controller as a sensor signal. The controller then controls at least a controllable frequency converter in response to the sensor signal and, depending on the design of the electrical control device, directly or indirectly controls a controllable switching device.

[0021] Specifically, this could mean that the controller controls the controllable switching device so that the three-phase drive motor in the drive unit is supplied with a three-phase power supply voltage of three times 400 volts during load operation and with a three-phase output voltage from a frequency converter of three times 0 to 230 volts during idle operation. With a three-phase power supply voltage of 380 volts, the three-phase drive motor in the drive unit would correspondingly be supplied with a three-phase power supply voltage of three times 380 volts during load operation and with a three-phase output voltage from a frequency converter of three times 0 to 220 volts during idle operation.

[0022] As already mentioned above, the passenger transport system may have at least one transport requirement signal transmitter, by which transport requirements, and thus imminent load operation, can be detected. The transport requirement signal transmitter transmits the detected transport requirements as a sensor signal to the controller, and in response to this sensor signal, the controller controls a controllable frequency converter and a controllable switching device.

[0023] Further advantages, features, and details of the present invention can be found in the following description of embodiments by reference to drawings in which similar or functionally similar elements are denoted by the same reference numerals. The drawings are for illustrative purposes only and are not drawn to actual size. [Brief explanation of the drawing]

[0024] [Figure 1] This figure shows a passenger transport system designed as an escalator or moving walkway, having at least a controller, a three-phase drive motor, and an electrical control device. [Figure 2] This figure shows various possible operating states. [Figure 3A] This figure shows the rectifier module of the frequency converter in the first embodiment. [Figure 3B] This figure shows the rectifier module of the frequency converter in the second embodiment. [Figure 3C] This figure shows the rectifier module of the frequency converter in the third embodiment. [Modes for carrying out the invention]

[0025] Figure 1 shows a passenger transport system 1 designed as an escalator. The components of the passenger transport system 1 visible to the user are a continuously movable conveyor belt 3 having steps 5. A railing 7 with continuously movable handrails 9 extends to the left and right sides of the conveyor belt 3. The return of the handrails 9 and the conveyor belt 3 takes place within the passenger transport system 1 and is therefore hidden from the user. A transport requirements signal transmitter 11 that monitors the access area 13 of the passenger transport system 1 is also hidden. In this embodiment, the transport requirements signal transmitter 11 is a radar sensor configured to be hidden behind the handrail entrance cap 15. Their detection area 17 is indicated by a dashed line.

[0026] As shown by the broad arrow, the controller 21, the three-phase drive motor 25, and the electric control device 23 are also housed within the passenger transportation system 1. The three-phase drive motor 25 can act on the conveyor belt 3 and the handrail 9 via a transmission part (not shown) to drive them. As shown as an example in FIG. 2 described later, the controller 21 controls and adjusts the driving operation of the passenger transportation system 1.

[0027] As shown in FIG. 1, the electric control device 23 includes at least a three-phase power supply voltage connection part 31, a frequency converter 33, and a controllable switching device 35.

[0028] The three-phase power supply voltage connection part 31 is used to supply the three-phase power supply voltage U via the three phases R, S, T and also has a neutral line N. In this embodiment, the neutral line N and the phase R of the power supply voltage connection part 31 are connected to the rectifier module 37 of the frequency converter 33 to supply the supply voltage U. N For various embodiments including those in which all of the three phases R, S, T and the neutral line N of the power supply voltage connection part are connected to the rectifier module 37, it will be described below with reference to FIGS. 3A to 3C. AC The frequency converter 33 also has a DC voltage circuit 39 supplied by the rectifier module 37. Depending on the configuration of the rectifier module 37, the rectifier module may be useful when the DC voltage U in the DC voltage circuit 39 is smoothed by the capacitor 41. Next, the DC voltage circuit 39 will supply the converter module 43 of the frequency converter 33. The converter module 43 can be controlled regarding its three-phase output voltages U, U, U. For this purpose, the frequency converter 33 can be activated by the controller 21 as shown by the bidirectional arrow S1 shown by the dashed line. The output voltages U, U, U

[0029] The frequency converter 33 also has a DC voltage circuit 39 supplied by the rectifier module 37. Depending on the configuration of the rectifier module 37, the rectifier module may be useful when the DC voltage U in the DC voltage circuit 39 is smoothed by the capacitor 41. Next, the DC voltage circuit 39 will supply the converter module 43 of the frequency converter 33. The converter module 43 can be controlled regarding its three-phase output voltages U, U, U. For this purpose, the frequency converter 33 can be activated by the controller 21 as shown by the bidirectional arrow S1 shown by the dashed line. The output voltages U, U, U DC The frequency converter 33 also has a DC voltage circuit 39 supplied by the rectifier module 37. Depending on the configuration of the rectifier module 37, the rectifier module may be useful when the DC voltage U in the DC voltage circuit 39 is smoothed by the capacitor 41. Next, the DC voltage circuit 39 will supply the converter module 43 of the frequency converter 33. The converter module 43 can be controlled regarding its three-phase output voltages U, U, U. For this purpose, the frequency converter 33 can be activated by the controller 21 as shown by the bidirectional arrow S1 shown by the dashed line. The output voltages U, U, U AC1 、U AC2 、U AC3 、U AC1 、U AC2 、U AC3This is output by the converter module 43 via three phases U1, V1, and W1.

[0030] The three phases U1, V1, and W1 are connected to a first switch configuration 51 of the controllable switching device 35. The three phases R, S, and T of the power supply voltage connection 31 are also connected to a second switch configuration 53 of the controllable switching device 35. Both switch configurations 51 and 53 are switched by actuators 55 of the controllable switching device 35, and actuators 55 are also activated by the controller 21, as indicated by the bidirectional arrow S2 shown by the dashed line. Since a bidirectional signal flow is provided, bidirectional arrows S1 and S2 are used here. On the one hand, control commands are sent from the controller 21 to the frequency converter 33 or the controllable switching device 35, and on the other hand, their current states are sent back to the controller 21.

[0031] The controllable switching device 35 has the task of switching between a load operation switching state B2 and an idle operation switching state B1 (see Figure 2). In load operation B2, the three phases U2, V2, and W2 of the drive motor 25 are coupled to the three phases R, S, and T of the power supply voltage connection 31, while the three phases U1, V1, and W1 of the converter module 43 are discoupled from the three phases U2, V2, and W2 of the drive motor 25. In idle operation switching state B1, the coupling is exactly the opposite: the three phases U2, V2, and W2 of the drive motor 25 are coupled to the three phases U1, V1, and W1 of the converter module 43, while the three phases R, S, and T of the power supply voltage connection 31 are discoupled from the three phases U2, V2, and W2 of the drive motor 25. In other words, in load operation, the drive motor 25 is coupled to the three phase power supply voltage U N The three-phase output voltage U of the frequency converter 33 is supplied during idle operation. AC1 , U AC2 , U AC3 It will be supplied.

[0032] As already described, the passenger transport system 1 has transport requirement signal transmitters 11 within the access area 13. When a user approaches this area to enter the access area 13 of the passenger transport system 1, the user can be detected by these signal transmitters. Thus, the transport requirement signal transmitters 11 detect transport requirements, and therefore imminent load operations. The detected transport requirements are transmitted to the controller 21 as a sensor signal S3, and the controller 21 controls a controllable frequency converter 33 and a controllable switching device 35 in response to this sensor signal S3.

[0033] To illustrate the interaction of the power supply voltage connection 31, the frequency converter 33, and the controllable switching device 35, exemplary speed curves 61 under various possible operating conditions are shown in Figure 2. The speed V of the conveyor belt 3 is plotted on the vertical axis, and time t is plotted on the horizontal axis. Various operating conditions are described below with reference to Figures 1 and 2.

[0034] At time 0, for example, an approaching user is detected by the transport requirements signal transmitter 11 and reported to the controller 21 as a transport requirement. The controller then uses the three-phase output voltage U of the frequency converter 33. AC1 , U AC2 , U AC3 By adjusting upwards, the controllable switching device 35 is switched to idle operation switching state B1. In other words, the three-phase output voltage U of the frequency converter 33 AC1 , U AC2 , U AC3 The current is supplied to the drive motor, while the drive motor 25 is disconnected from the three-phase power supply voltage connection part 31. Between time 0 and time 1, the frequency converter 33 determines that the speed curve 61 of the conveyor belt 3 and handrail 9 is at its maximum nominal speed V N It is adjusted upwards so that it increases in a ramp-like manner.

[0035] At time 1, the user has almost reached conveyor belt 3, and the conveyor belt is moving at nominal speed V NHere, the controller 21 can send a switching signal S2 to the controllable switching device 35. Switching causes the three-phase drive motor 25 to be uncoupled from the frequency converter 33 and connected to the three phases R, S, and T of the power supply voltage connection 31. Thus, the controllable switching device 35 changes from idle operation switching state B1 to load operation switching state B2 in order to supply the three-phase drive motor 25 with enough electrical energy to transport the user without loss of speed.

[0036] At time 2, the user left passenger transport device 1. This time is, for example, based on the travel time t and nominal speed V. N It can be calculated from. Alternatively, signals from transport requirement signal transmitters 11 located in other access areas 13 can also be used, of course, to register the departure of a user and report this to the controller 21. From time 2, the speed V of the conveyor belt 3 and handrail 9 can be reduced again if no new users approach. To reduce the speed V, the controllable switching device 35 is returned from load operation switching state B2 to idle operation switching state B1 at time 2, and the output voltage U of the frequency converter 33 is changed. AC1 , U AC2 , U AC3 It is first adjusted upward before the switching process, and then adjusted downward in a ramp-like manner after the switching process.

[0037] Regarding further actions, there are two possible options:

[0038] In the first modification, the conveyor belt 3 can be stopped P in idle operation switching state B1, which in this example is reached at point 4 and remains in place until point 5. As soon as the transport requirements signal transmitter 11 reports the transport requirements again (here at time 5), the drive motor 25 is started by the frequency converter 33 in the same manner as already described for time 0 to time 1, and reaches nominal speed V at time 7. NUpon reaching this state, a switching process is performed by the controllable switching device 35 from idle operation switching state B1 to load operation switching state B2.

[0039] In the second modification, the conveyor belt 3 can be put into a state known as crawl S in idle operation switching state B1, and crawl speed V S For example, nominal speed V N It corresponds to half of the crawl speed V. S The transport requirements remain constant until time 5, as indicated by the dashed line. Then, the drive motor 25 reaches the nominal speed V at time 6. N After reaching this point, the frequency converter 33 restarts the belt until a switching process is performed by the controllable switching device 35 from idle operation switching state B1 to load operation switching state B2. As can be clearly seen from the figure, in the second modification the conveyor belt 11 reaches the nominal speed V much earlier. N Once this is reached, the switching process can be carried out more quickly.

[0040] During the switching process, the phase zero crossover of the power supply voltage connection section 31 occurs at the output voltage U of the frequency converter 33. AC1 , U AC2 , U AC3 If the phase zero crossover occurs, this could result in an undesirable additional load on the mechanical and electrical components of the passenger transport system 1. To avoid this, the electrical control device 23 may have a phase-locking module 63. For example, if the phase zero crossover is detected by sensors 65, 67 and the IGBT (not shown) of the transducer module 43 is controlled accordingly, the phase-locking module 63 controls the three-phase output voltage U of the frequency transducer 33. AC1 , U AC2 , U AC3The converter frequency is synchronized with the power supply frequency of the three-phase power supply voltage connection section 31, so that the zero crossing and phase position of the three phases U1, V1, and W1 coincide with the corresponding phases R, S, and T of the power supply voltage connection section 31. The phase-synchronous module 63 then triggers the switching process of the controllable switching device 35 according to the synchronized power supply frequency and converter frequency. As shown in the figure, the entire logic of the phase-synchronous module 63 can be implemented in the controller 21 of the passenger transport system 1. Of course, the phase-synchronous module 63 can also be implemented separately from the controller 21.

[0041] As already described and shown in Figure 1, the rectifier module 37 of the frequency converter 33 is supplied by at least one phase R and the neutral wire N of the power supply voltage connection section 31. In other words, the frequency converter supply voltage U AC A voltage is applied and supplied to the frequency converter 66, and this supply voltage is the three-phase power supply voltage U N It is 1 / √3 times that, or 1 / 1.73 times.

[0042] Therefore, for example, a three-phase power supply voltage U is three times 400 volts. N So, the frequency converter supply voltage U AC The voltage is 230 volts. After rectification, the DC voltage U is applied to the DC voltage circuit 39. DC A DC voltage exists, and this DC voltage changes depending on the load. The three-phase output voltage U of the converter module 43 is supplied by the DC voltage circuit 39. AC1 , U AC2 , U AC3 This is under the condition that this DC voltage is approximately a sine wave, and the existing DC voltage U DC As a result, it can be varied within a range of three times from 0 to 230 volts. 380 volts, three times the three-phase power supply voltage U N Therefore, the supply voltage of the frequency converter is 220 volts, and correspondingly, the three-phase output voltage U of the frequency converter 33 AC1 , U AC2 , U AC3 In either case, it can be varied within a range of three times from 0 to 220 volts.

[0043] The frequency converter 33 may have a rectifier module 37 with a different configuration. The rectifier module 37 shown in Figure 3A has a diode bridge circuit 71. This bridge circuit is connected at its input side 77 to phase R and neutral wire N of the three-phase power supply voltage connection 31. The DC voltage U generated by the bridge circuit 71 DC This is output to the downstream DC voltage circuit 39 of the frequency converter 33, where it is smoothed by the capacitor 41.

[0044] The rectifier module 37 shown in Figure 3B has a diode configuration 73 that deviates from the bridge circuit 71 and is connected at its input side 77 to the respective phases R, S, and T of the three-phase power supply voltage connection section 31. The three phases R, S, and T are each brought together via diodes having the same reverse direction, so that only the positive half-waves are allowed to pass through due to the reverse direction, thus forming the positive terminal of the DC voltage circuit 39 of the frequency converter 33. In this case, the neutral wire N forms the negative terminal of the DC voltage circuit 39.

[0045] The rectifier module 37 shown in Figure 3C has a diode configuration 75 that is almost identical to the diode configuration in Figure 3B described earlier, and is also connected to the neutral wire N and the three phases R, S, and T of the three-phase power supply voltage connection section 31. The three phases R, S, and T are each brought together via diodes having the same reverse direction so that only negative half-waves are allowed to pass due to the reverse direction, thus forming the negative terminal of the DC voltage circuit 39 of the frequency converter 33. In this case, the neutral wire N forms the positive terminal of the DC voltage circuit 39.

[0046] Figure 1 shows a passenger transport system 1 designed as an escalator, but it is clear that the present invention can also be used in a passenger transport system 1 designed as a moving walkway.

[0047] Finally, it should be noted that terms such as “comprising” and “having” do not exclude other elements or steps, and terms such as “a” or “an” do not exclude multiple elements or steps. Furthermore, it should be noted that features or steps described with reference to one of the above embodiments may also be used in combination with other features or steps of the other embodiments described above. Reference numerals in the claims should not be considered restrictive.

Claims

1. An electrical control device (23) for controlling the drive unit of a passenger transport system (1), which can be switched between load operation and idle operation, wherein the passenger transport system (1) is designed as an escalator or moving walkway and has a three-phase drive motor (25), and the electrical control device (23) has at least, - Three-phase power supply voltage (U Ｎ A three-phase power supply voltage connection section (31) for supplying ) - Frequency converter (33), wherein at least its three-phase output voltage (U ＡＣ１ , U ＡＣ２ , U ＡＣ３ A frequency converter (33) that can be controlled with respect to the frequency of ) - Controllable switching device (35) Comprising a controllable switching device (35), the drive motor (25) is supplied with a three-phase power supply voltage (U Ｎ ) in the load operation switching state (B2), and with the three-phase output voltage (U ＡＣ１ , U ＡＣ２ , U ＡＣ３ ) of the frequency converter (33) in the idle operation switching state (B1). The three phases (U ２ , V ２ , W ２ ) of the drive motor (25) can be coupled to the three phases (R, S, T) of the power supply voltage connection part (31) in the load operation switching state (B2), and the three phases (U ２ , V ２ , W ２ ) of the drive motor (25) can be coupled to the three phases (U １ , V １ , W １ ) of the frequency converter (33) in the idle operation switching state (B1). It has The frequency converter (33) is supplied with power via at least one phase (R, S, T) of the three-phase power supply voltage connection section (31) and the neutral wire (N) of the power supply voltage connection section (31). An electrically controlled device (23) characterized by the above.

2. Frequency converter supply voltage (U ＡＣ A voltage (U) is applied and supplied to the frequency converter (33), and the frequency converter supply voltage (U) is applied. ＡＣ ) is the three-phase power supply voltage (U Ｎ The electrical control device (23) according to claim 1, which is 1 / √3 times the value of the above.

3. Three-phase power supply voltage (U Ｎ ) is three times 400 volts, and the three-phase output voltage of the frequency converter (33) (U ＡＣ１ , U ＡＣ２ , U ＡＣ３ The electrical control device (23) according to claim 2, wherein the voltage range is three times from 0 to 230 volts.

4. Three-phase power supply voltage (U Ｎ ) is three times 380 volts, and the three-phase output voltage of the frequency converter (33) (U ＡＣ１ , U ＡＣ２ , U ＡＣ３ The electrical control device (23) according to claim 2, wherein the voltage range is three times from 0 to 220 volts.

5. The electrical control device (23) according to any one of claims 1 to 4, wherein the frequency converter (33) has a rectifier module (37) having a diode bridge circuit (71), and the diode bridge circuit (71) is connected at its input side (77) to the phase (R) and neutral wire (N) of the three-phase power supply voltage connection section (31).

6. The electrical control device (23) according to any one of claims 1 to 5, wherein the frequency converter (33) has a rectifier module (37) having a diode configuration (73), the rectifier module (37) is connected at its input side (77) to each phase (R, S, T) of a three-phase power supply voltage connection section (31), the three phases (R, S, T) are combined via the same reverse-direction diodes to form the positive electrode of the DC voltage circuit (39) of the frequency converter (33), and the neutral wire (N) forms the negative electrode of the DC voltage circuit (39).

7. The electrical control device (23) according to any one of claims 1 to 5, wherein the frequency converter (33) has a rectifier module (37) having a diode configuration (75), the rectifier module (37) is connected at its input side (77) to each phase (R, S, T) of a three-phase power supply voltage connection section (31), the three phases (R, S, T) are combined via the same reverse-direction diodes to form the negative terminal of the DC voltage circuit (39) of the frequency converter (33), and the neutral wire (N) forms the positive terminal of the DC voltage circuit (39).

8. An electrically controlled device (23) according to any one of claims 1 to 7, wherein a controllable switching device (35) can be controlled by a controller (21) of a passenger transport system (1).

9. The electrical control device has a phase-locking module (63), and the phase-locking module (63) controls the three-phase output voltage (U) of the frequency converter (33). ＡＣ１ , U ＡＣ２ , U ＡＣ３ An electrical control device (23) according to any one of claims 1 to 8, which synchronizes the converter frequency of the three-phase power supply voltage connection section (31) with the power supply frequency of the three-phase power supply voltage connection section (31), and triggers the switching process of a controllable switching device (35) according to the synchronized power supply frequency and converter frequency.

10. A passenger transport system (1) designed as an escalator or moving walkway, comprising at least a controller (21), a three-phase drive motor (25), and an electrical control device (23) according to any one of claims 1 to 9, wherein the controller (21) is a wired or wireless signal connection unit (S １ S ２ A passenger transport system (1) connected via a controllable frequency converter (33) and a controllable switching device (35) of the electrical control device (23) to an electrical control device (23).

11. The system has at least one transport requirement signal transmitter (11), and the transport requirement can be detected by at least one transport requirement signal transmitter (11), and this transport requirement is transmitted via a sensor signal (S ３ In response to the sensor signal (S), the controller (21) controls the controllable frequency converter (33) and the controllable switching device (35) ３ The passenger transport system (1) according to claim 10, which is transmitted to the controller (21) as follows:

12. A method for controlling the drive unit of a passenger transport system (1) according to claim 10 or 11, wherein the three-phase drive motor (25) of the drive unit is supplied with a three-phase power supply voltage (U) which is three times 400 volts during load operation. Ｎ ) is supplied, and during idle operation, the three-phase output voltage (U) of the frequency converter (33) is 0 to 230 volts. ＡＣ１ , U ＡＣ２ , U ＡＣ３ A method in which a controller (21) controls a controllable switching device (35) so that a supply of ) is provided.

13. A method for controlling the drive unit of the passenger transport system (1) according to claim 10 or 11, wherein the three-phase drive motor (25) of the drive unit is supplied with a three-phase power supply voltage (U) which is three times 380 volts during load operation. Ｎ ) is supplied, and during idle operation, the three-phase output voltage (U) of the frequency converter (33) is 0 to 220 volts. ＡＣ１ , U ＡＣ２ , U ＡＣ３ A method in which a controller (21) controls a controllable switching device (35) so that a supply is provided. 【Request Item 14】 The passenger transport system (1) has at least one transport requirement signal transmitter (11) which can detect transport requirements, and therefore imminent load operations, and the transport requirement signal transmitter (11) transmits the detected transport requirements as a sensor signal (S ３ This sensor signal (S) is sent to the controller (21) and this sensor signal (S ３ The method according to claim 12 or 13, wherein the controller (21) controls a controllable frequency converter (33) and a controllable switching device (35) in accordance with the above.

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